210 files changed, 16198 insertions, 1502 deletions

diff --git a/inc/Encoding.php b/inc/3rdparty/Encoding.php
index 577763b4..577763b4 100644
--- a/inc/Encoding.php
+++ b/inc/3rdparty/Encoding.php
diff --git a/inc/JSLikeHTMLElement.php b/inc/3rdparty/JSLikeHTMLElement.php
index 238ba8a8..238ba8a8 100644
--- a/inc/JSLikeHTMLElement.php
+++ b/inc/3rdparty/JSLikeHTMLElement.php
diff --git a/inc/Readability.php b/inc/3rdparty/Readability.php
index e1e8738b..e1e8738b 100644
--- a/inc/Readability.php
+++ b/inc/3rdparty/Readability.php
diff --git a/inc/Session.class.php b/inc/3rdparty/Session.class.php
index eff924cc..eff924cc 100644
--- a/inc/Session.class.php
+++ b/inc/3rdparty/Session.class.php
diff --git a/inc/simple_html_dom.php b/inc/3rdparty/simple_html_dom.php
index 43b94e57..43b94e57 100644
--- a/inc/simple_html_dom.php
+++ b/inc/3rdparty/simple_html_dom.php
diff --git a/inc/Twig/Autoloader.php b/inc/Twig/Autoloader.php
new file mode 100644
index 00000000..7007d315
--- /dev/null
+++ b/inc/Twig/Autoloader.php
@@ -0,0 +1,48 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Autoloads Twig classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Autoloader
+{
+    /**
+     * Registers Twig_Autoloader as an SPL autoloader.
+     *
+     * @param Boolean $prepend Whether to prepend the autoloader or not.
+     */
+    public static function register($prepend = false)
+    {
+        if (version_compare(phpversion(), '5.3.0', '>=')) {
+            spl_autoload_register(array(new self, 'autoload'), true, $prepend);
+        } else {
+            spl_autoload_register(array(new self, 'autoload'));
+        }
+    }
+
+    /**
+     * Handles autoloading of classes.
+     *
+     * @param string $class A class name.
+     */
+    public static function autoload($class)
+    {
+        if (0 !== strpos($class, 'Twig')) {
+            return;
+        }
+
+        if (is_file($file = dirname(__FILE__).'/../'.str_replace(array('_', "\0"), array('/', ''), $class).'.php')) {
+            require $file;
+        }
+    }
+}
diff --git a/inc/Twig/Compiler.php b/inc/Twig/Compiler.php
new file mode 100644
index 00000000..99aecbcc
--- /dev/null
+++ b/inc/Twig/Compiler.php
@@ -0,0 +1,267 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Compiles a node to PHP code.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Compiler implements Twig_CompilerInterface
+{
+    protected $lastLine;
+    protected $source;
+    protected $indentation;
+    protected $env;
+    protected $debugInfo;
+    protected $sourceOffset;
+    protected $sourceLine;
+    protected $filename;
+
+    /**
+     * Constructor.
+     *
+     * @param Twig_Environment $env The twig environment instance
+     */
+    public function __construct(Twig_Environment $env)
+    {
+        $this->env = $env;
+        $this->debugInfo = array();
+    }
+
+    public function getFilename()
+    {
+        return $this->filename;
+    }
+
+    /**
+     * Returns the environment instance related to this compiler.
+     *
+     * @return Twig_Environment The environment instance
+     */
+    public function getEnvironment()
+    {
+        return $this->env;
+    }
+
+    /**
+     * Gets the current PHP code after compilation.
+     *
+     * @return string The PHP code
+     */
+    public function getSource()
+    {
+        return $this->source;
+    }
+
+    /**
+     * Compiles a node.
+     *
+     * @param Twig_NodeInterface $node        The node to compile
+     * @param integer            $indentation The current indentation
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function compile(Twig_NodeInterface $node, $indentation = 0)
+    {
+        $this->lastLine = null;
+        $this->source = '';
+        $this->sourceOffset = 0;
+        // source code starts at 1 (as we then increment it when we encounter new lines)
+        $this->sourceLine = 1;
+        $this->indentation = $indentation;
+
+        if ($node instanceof Twig_Node_Module) {
+            $this->filename = $node->getAttribute('filename');
+        }
+
+        $node->compile($this);
+
+        return $this;
+    }
+
+    public function subcompile(Twig_NodeInterface $node, $raw = true)
+    {
+        if (false === $raw) {
+            $this->addIndentation();
+        }
+
+        $node->compile($this);
+
+        return $this;
+    }
+
+    /**
+     * Adds a raw string to the compiled code.
+     *
+     * @param string $string The string
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function raw($string)
+    {
+        $this->source .= $string;
+
+        return $this;
+    }
+
+    /**
+     * Writes a string to the compiled code by adding indentation.
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function write()
+    {
+        $strings = func_get_args();
+        foreach ($strings as $string) {
+            $this->addIndentation();
+            $this->source .= $string;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Appends an indentation to the current PHP code after compilation.
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function addIndentation()
+    {
+        $this->source .= str_repeat(' ', $this->indentation * 4);
+
+        return $this;
+    }
+
+    /**
+     * Adds a quoted string to the compiled code.
+     *
+     * @param string $value The string
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function string($value)
+    {
+        $this->source .= sprintf('"%s"', addcslashes($value, "\0\t\"\$\\"));
+
+        return $this;
+    }
+
+    /**
+     * Returns a PHP representation of a given value.
+     *
+     * @param mixed $value The value to convert
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function repr($value)
+    {
+        if (is_int($value) || is_float($value)) {
+            if (false !== $locale = setlocale(LC_NUMERIC, 0)) {
+                setlocale(LC_NUMERIC, 'C');
+            }
+
+            $this->raw($value);
+
+            if (false !== $locale) {
+                setlocale(LC_NUMERIC, $locale);
+            }
+        } elseif (null === $value) {
+            $this->raw('null');
+        } elseif (is_bool($value)) {
+            $this->raw($value ? 'true' : 'false');
+        } elseif (is_array($value)) {
+            $this->raw('array(');
+            $i = 0;
+            foreach ($value as $key => $value) {
+                if ($i++) {
+                    $this->raw(', ');
+                }
+                $this->repr($key);
+                $this->raw(' => ');
+                $this->repr($value);
+            }
+            $this->raw(')');
+        } else {
+            $this->string($value);
+        }
+
+        return $this;
+    }
+
+    /**
+     * Adds debugging information.
+     *
+     * @param Twig_NodeInterface $node The related twig node
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function addDebugInfo(Twig_NodeInterface $node)
+    {
+        if ($node->getLine() != $this->lastLine) {
+            $this->write("// line {$node->getLine()}\n");
+
+            // when mbstring.func_overload is set to 2
+            // mb_substr_count() replaces substr_count()
+            // but they have different signatures!
+            if (((int) ini_get('mbstring.func_overload')) & 2) {
+                // this is much slower than the "right" version
+                $this->sourceLine += mb_substr_count(mb_substr($this->source, $this->sourceOffset), "\n");
+            } else {
+                $this->sourceLine += substr_count($this->source, "\n", $this->sourceOffset);
+            }
+            $this->sourceOffset = strlen($this->source);
+            $this->debugInfo[$this->sourceLine] = $node->getLine();
+
+            $this->lastLine = $node->getLine();
+        }
+
+        return $this;
+    }
+
+    public function getDebugInfo()
+    {
+        return $this->debugInfo;
+    }
+
+    /**
+     * Indents the generated code.
+     *
+     * @param integer $step The number of indentation to add
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function indent($step = 1)
+    {
+        $this->indentation += $step;
+
+        return $this;
+    }
+
+    /**
+     * Outdents the generated code.
+     *
+     * @param integer $step The number of indentation to remove
+     *
+     * @return Twig_Compiler The current compiler instance
+     */
+    public function outdent($step = 1)
+    {
+        // can't outdent by more steps than the current indentation level
+        if ($this->indentation < $step) {
+            throw new LogicException('Unable to call outdent() as the indentation would become negative');
+        }
+
+        $this->indentation -= $step;
+
+        return $this;
+    }
+}
diff --git a/inc/Twig/CompilerInterface.php b/inc/Twig/CompilerInterface.php
new file mode 100644
index 00000000..e293ec91
--- /dev/null
+++ b/inc/Twig/CompilerInterface.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by compiler classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_CompilerInterface
+{
+    /**
+     * Compiles a node.
+     *
+     * @param Twig_NodeInterface $node The node to compile
+     *
+     * @return Twig_CompilerInterface The current compiler instance
+     */
+    public function compile(Twig_NodeInterface $node);
+
+    /**
+     * Gets the current PHP code after compilation.
+     *
+     * @return string The PHP code
+     */
+    public function getSource();
+}
diff --git a/inc/Twig/Environment.php b/inc/Twig/Environment.php
new file mode 100644
index 00000000..3afa73d6
--- /dev/null
+++ b/inc/Twig/Environment.php
@@ -0,0 +1,1224 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Stores the Twig configuration.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Environment
+{
+    const VERSION = '1.13.1';
+
+    protected $charset;
+    protected $loader;
+    protected $debug;
+    protected $autoReload;
+    protected $cache;
+    protected $lexer;
+    protected $parser;
+    protected $compiler;
+    protected $baseTemplateClass;
+    protected $extensions;
+    protected $parsers;
+    protected $visitors;
+    protected $filters;
+    protected $tests;
+    protected $functions;
+    protected $globals;
+    protected $runtimeInitialized;
+    protected $extensionInitialized;
+    protected $loadedTemplates;
+    protected $strictVariables;
+    protected $unaryOperators;
+    protected $binaryOperators;
+    protected $templateClassPrefix = '__TwigTemplate_';
+    protected $functionCallbacks;
+    protected $filterCallbacks;
+    protected $staging;
+
+    /**
+     * Constructor.
+     *
+     * Available options:
+     *
+     *  * debug: When set to true, it automatically set "auto_reload" to true as
+     *           well (default to false).
+     *
+     *  * charset: The charset used by the templates (default to UTF-8).
+     *
+     *  * base_template_class: The base template class to use for generated
+     *                         templates (default to Twig_Template).
+     *
+     *  * cache: An absolute path where to store the compiled templates, or
+     *           false to disable compilation cache (default).
+     *
+     *  * auto_reload: Whether to reload the template is the original source changed.
+     *                 If you don't provide the auto_reload option, it will be
+     *                 determined automatically base on the debug value.
+     *
+     *  * strict_variables: Whether to ignore invalid variables in templates
+     *                      (default to false).
+     *
+     *  * autoescape: Whether to enable auto-escaping (default to html):
+     *                  * false: disable auto-escaping
+     *                  * true: equivalent to html
+     *                  * html, js: set the autoescaping to one of the supported strategies
+     *                  * PHP callback: a PHP callback that returns an escaping strategy based on the template "filename"
+     *
+     *  * optimizations: A flag that indicates which optimizations to apply
+     *                   (default to -1 which means that all optimizations are enabled;
+     *                   set it to 0 to disable).
+     *
+     * @param Twig_LoaderInterface $loader  A Twig_LoaderInterface instance
+     * @param array                $options An array of options
+     */
+    public function __construct(Twig_LoaderInterface $loader = null, $options = array())
+    {
+        if (null !== $loader) {
+            $this->setLoader($loader);
+        }
+
+        $options = array_merge(array(
+            'debug'               => false,
+            'charset'             => 'UTF-8',
+            'base_template_class' => 'Twig_Template',
+            'strict_variables'    => false,
+            'autoescape'          => 'html',
+            'cache'               => false,
+            'auto_reload'         => null,
+            'optimizations'       => -1,
+        ), $options);
+
+        $this->debug              = (bool) $options['debug'];
+        $this->charset            = strtoupper($options['charset']);
+        $this->baseTemplateClass  = $options['base_template_class'];
+        $this->autoReload         = null === $options['auto_reload'] ? $this->debug : (bool) $options['auto_reload'];
+        $this->strictVariables    = (bool) $options['strict_variables'];
+        $this->runtimeInitialized = false;
+        $this->setCache($options['cache']);
+        $this->functionCallbacks = array();
+        $this->filterCallbacks = array();
+
+        $this->addExtension(new Twig_Extension_Core());
+        $this->addExtension(new Twig_Extension_Escaper($options['autoescape']));
+        $this->addExtension(new Twig_Extension_Optimizer($options['optimizations']));
+        $this->extensionInitialized = false;
+        $this->staging = new Twig_Extension_Staging();
+    }
+
+    /**
+     * Gets the base template class for compiled templates.
+     *
+     * @return string The base template class name
+     */
+    public function getBaseTemplateClass()
+    {
+        return $this->baseTemplateClass;
+    }
+
+    /**
+     * Sets the base template class for compiled templates.
+     *
+     * @param string $class The base template class name
+     */
+    public function setBaseTemplateClass($class)
+    {
+        $this->baseTemplateClass = $class;
+    }
+
+    /**
+     * Enables debugging mode.
+     */
+    public function enableDebug()
+    {
+        $this->debug = true;
+    }
+
+    /**
+     * Disables debugging mode.
+     */
+    public function disableDebug()
+    {
+        $this->debug = false;
+    }
+
+    /**
+     * Checks if debug mode is enabled.
+     *
+     * @return Boolean true if debug mode is enabled, false otherwise
+     */
+    public function isDebug()
+    {
+        return $this->debug;
+    }
+
+    /**
+     * Enables the auto_reload option.
+     */
+    public function enableAutoReload()
+    {
+        $this->autoReload = true;
+    }
+
+    /**
+     * Disables the auto_reload option.
+     */
+    public function disableAutoReload()
+    {
+        $this->autoReload = false;
+    }
+
+    /**
+     * Checks if the auto_reload option is enabled.
+     *
+     * @return Boolean true if auto_reload is enabled, false otherwise
+     */
+    public function isAutoReload()
+    {
+        return $this->autoReload;
+    }
+
+    /**
+     * Enables the strict_variables option.
+     */
+    public function enableStrictVariables()
+    {
+        $this->strictVariables = true;
+    }
+
+    /**
+     * Disables the strict_variables option.
+     */
+    public function disableStrictVariables()
+    {
+        $this->strictVariables = false;
+    }
+
+    /**
+     * Checks if the strict_variables option is enabled.
+     *
+     * @return Boolean true if strict_variables is enabled, false otherwise
+     */
+    public function isStrictVariables()
+    {
+        return $this->strictVariables;
+    }
+
+    /**
+     * Gets the cache directory or false if cache is disabled.
+     *
+     * @return string|false
+     */
+    public function getCache()
+    {
+        return $this->cache;
+    }
+
+     /**
+      * Sets the cache directory or false if cache is disabled.
+      *
+      * @param string|false $cache The absolute path to the compiled templates,
+      *                            or false to disable cache
+      */
+    public function setCache($cache)
+    {
+        $this->cache = $cache ? $cache : false;
+    }
+
+    /**
+     * Gets the cache filename for a given template.
+     *
+     * @param string $name The template name
+     *
+     * @return string The cache file name
+     */
+    public function getCacheFilename($name)
+    {
+        if (false === $this->cache) {
+            return false;
+        }
+
+        $class = substr($this->getTemplateClass($name), strlen($this->templateClassPrefix));
+
+        return $this->getCache().'/'.substr($class, 0, 2).'/'.substr($class, 2, 2).'/'.substr($class, 4).'.php';
+    }
+
+    /**
+     * Gets the template class associated with the given string.
+     *
+     * @param string  $name  The name for which to calculate the template class name
+     * @param integer $index The index if it is an embedded template
+     *
+     * @return string The template class name
+     */
+    public function getTemplateClass($name, $index = null)
+    {
+        return $this->templateClassPrefix.md5($this->getLoader()->getCacheKey($name)).(null === $index ? '' : '_'.$index);
+    }
+
+    /**
+     * Gets the template class prefix.
+     *
+     * @return string The template class prefix
+     */
+    public function getTemplateClassPrefix()
+    {
+        return $this->templateClassPrefix;
+    }
+
+    /**
+     * Renders a template.
+     *
+     * @param string $name    The template name
+     * @param array  $context An array of parameters to pass to the template
+     *
+     * @return string The rendered template
+     */
+    public function render($name, array $context = array())
+    {
+        return $this->loadTemplate($name)->render($context);
+    }
+
+    /**
+     * Displays a template.
+     *
+     * @param string $name    The template name
+     * @param array  $context An array of parameters to pass to the template
+     */
+    public function display($name, array $context = array())
+    {
+        $this->loadTemplate($name)->display($context);
+    }
+
+    /**
+     * Loads a template by name.
+     *
+     * @param string  $name  The template name
+     * @param integer $index The index if it is an embedded template
+     *
+     * @return Twig_TemplateInterface A template instance representing the given template name
+     */
+    public function loadTemplate($name, $index = null)
+    {
+        $cls = $this->getTemplateClass($name, $index);
+
+        if (isset($this->loadedTemplates[$cls])) {
+            return $this->loadedTemplates[$cls];
+        }
+
+        if (!class_exists($cls, false)) {
+            if (false === $cache = $this->getCacheFilename($name)) {
+                eval('?>'.$this->compileSource($this->getLoader()->getSource($name), $name));
+            } else {
+                if (!is_file($cache) || ($this->isAutoReload() && !$this->isTemplateFresh($name, filemtime($cache)))) {
+                    $this->writeCacheFile($cache, $this->compileSource($this->getLoader()->getSource($name), $name));
+                }
+
+                require_once $cache;
+            }
+        }
+
+        if (!$this->runtimeInitialized) {
+            $this->initRuntime();
+        }
+
+        return $this->loadedTemplates[$cls] = new $cls($this);
+    }
+
+    /**
+     * Returns true if the template is still fresh.
+     *
+     * Besides checking the loader for freshness information,
+     * this method also checks if the enabled extensions have
+     * not changed.
+     *
+     * @param string    $name The template name
+     * @param timestamp $time The last modification time of the cached template
+     *
+     * @return Boolean true if the template is fresh, false otherwise
+     */
+    public function isTemplateFresh($name, $time)
+    {
+        foreach ($this->extensions as $extension) {
+            $r = new ReflectionObject($extension);
+            if (filemtime($r->getFileName()) > $time) {
+                return false;
+            }
+        }
+
+        return $this->getLoader()->isFresh($name, $time);
+    }
+
+    public function resolveTemplate($names)
+    {
+        if (!is_array($names)) {
+            $names = array($names);
+        }
+
+        foreach ($names as $name) {
+            if ($name instanceof Twig_Template) {
+                return $name;
+            }
+
+            try {
+                return $this->loadTemplate($name);
+            } catch (Twig_Error_Loader $e) {
+            }
+        }
+
+        if (1 === count($names)) {
+            throw $e;
+        }
+
+        throw new Twig_Error_Loader(sprintf('Unable to find one of the following templates: "%s".', implode('", "', $names)));
+    }
+
+    /**
+     * Clears the internal template cache.
+     */
+    public function clearTemplateCache()
+    {
+        $this->loadedTemplates = array();
+    }
+
+    /**
+     * Clears the template cache files on the filesystem.
+     */
+    public function clearCacheFiles()
+    {
+        if (false === $this->cache) {
+            return;
+        }
+
+        foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($this->cache), RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
+            if ($file->isFile()) {
+                @unlink($file->getPathname());
+            }
+        }
+    }
+
+    /**
+     * Gets the Lexer instance.
+     *
+     * @return Twig_LexerInterface A Twig_LexerInterface instance
+     */
+    public function getLexer()
+    {
+        if (null === $this->lexer) {
+            $this->lexer = new Twig_Lexer($this);
+        }
+
+        return $this->lexer;
+    }
+
+    /**
+     * Sets the Lexer instance.
+     *
+     * @param Twig_LexerInterface A Twig_LexerInterface instance
+     */
+    public function setLexer(Twig_LexerInterface $lexer)
+    {
+        $this->lexer = $lexer;
+    }
+
+    /**
+     * Tokenizes a source code.
+     *
+     * @param string $source The template source code
+     * @param string $name   The template name
+     *
+     * @return Twig_TokenStream A Twig_TokenStream instance
+     */
+    public function tokenize($source, $name = null)
+    {
+        return $this->getLexer()->tokenize($source, $name);
+    }
+
+    /**
+     * Gets the Parser instance.
+     *
+     * @return Twig_ParserInterface A Twig_ParserInterface instance
+     */
+    public function getParser()
+    {
+        if (null === $this->parser) {
+            $this->parser = new Twig_Parser($this);
+        }
+
+        return $this->parser;
+    }
+
+    /**
+     * Sets the Parser instance.
+     *
+     * @param Twig_ParserInterface A Twig_ParserInterface instance
+     */
+    public function setParser(Twig_ParserInterface $parser)
+    {
+        $this->parser = $parser;
+    }
+
+    /**
+     * Parses a token stream.
+     *
+     * @param Twig_TokenStream $tokens A Twig_TokenStream instance
+     *
+     * @return Twig_Node_Module A Node tree
+     */
+    public function parse(Twig_TokenStream $tokens)
+    {
+        return $this->getParser()->parse($tokens);
+    }
+
+    /**
+     * Gets the Compiler instance.
+     *
+     * @return Twig_CompilerInterface A Twig_CompilerInterface instance
+     */
+    public function getCompiler()
+    {
+        if (null === $this->compiler) {
+            $this->compiler = new Twig_Compiler($this);
+        }
+
+        return $this->compiler;
+    }
+
+    /**
+     * Sets the Compiler instance.
+     *
+     * @param Twig_CompilerInterface $compiler A Twig_CompilerInterface instance
+     */
+    public function setCompiler(Twig_CompilerInterface $compiler)
+    {
+        $this->compiler = $compiler;
+    }
+
+    /**
+     * Compiles a Node.
+     *
+     * @param Twig_NodeInterface $node A Twig_NodeInterface instance
+     *
+     * @return string The compiled PHP source code
+     */
+    public function compile(Twig_NodeInterface $node)
+    {
+        return $this->getCompiler()->compile($node)->getSource();
+    }
+
+    /**
+     * Compiles a template source code.
+     *
+     * @param string $source The template source code
+     * @param string $name   The template name
+     *
+     * @return string The compiled PHP source code
+     */
+    public function compileSource($source, $name = null)
+    {
+        try {
+            return $this->compile($this->parse($this->tokenize($source, $name)));
+        } catch (Twig_Error $e) {
+            $e->setTemplateFile($name);
+            throw $e;
+        } catch (Exception $e) {
+            throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the compilation of a template ("%s").', $e->getMessage()), -1, $name, $e);
+        }
+    }
+
+    /**
+     * Sets the Loader instance.
+     *
+     * @param Twig_LoaderInterface $loader A Twig_LoaderInterface instance
+     */
+    public function setLoader(Twig_LoaderInterface $loader)
+    {
+        $this->loader = $loader;
+    }
+
+    /**
+     * Gets the Loader instance.
+     *
+     * @return Twig_LoaderInterface A Twig_LoaderInterface instance
+     */
+    public function getLoader()
+    {
+        if (null === $this->loader) {
+            throw new LogicException('You must set a loader first.');
+        }
+
+        return $this->loader;
+    }
+
+    /**
+     * Sets the default template charset.
+     *
+     * @param string $charset The default charset
+     */
+    public function setCharset($charset)
+    {
+        $this->charset = strtoupper($charset);
+    }
+
+    /**
+     * Gets the default template charset.
+     *
+     * @return string The default charset
+     */
+    public function getCharset()
+    {
+        return $this->charset;
+    }
+
+    /**
+     * Initializes the runtime environment.
+     */
+    public function initRuntime()
+    {
+        $this->runtimeInitialized = true;
+
+        foreach ($this->getExtensions() as $extension) {
+            $extension->initRuntime($this);
+        }
+    }
+
+    /**
+     * Returns true if the given extension is registered.
+     *
+     * @param string $name The extension name
+     *
+     * @return Boolean Whether the extension is registered or not
+     */
+    public function hasExtension($name)
+    {
+        return isset($this->extensions[$name]);
+    }
+
+    /**
+     * Gets an extension by name.
+     *
+     * @param string $name The extension name
+     *
+     * @return Twig_ExtensionInterface A Twig_ExtensionInterface instance
+     */
+    public function getExtension($name)
+    {
+        if (!isset($this->extensions[$name])) {
+            throw new Twig_Error_Runtime(sprintf('The "%s" extension is not enabled.', $name));
+        }
+
+        return $this->extensions[$name];
+    }
+
+    /**
+     * Registers an extension.
+     *
+     * @param Twig_ExtensionInterface $extension A Twig_ExtensionInterface instance
+     */
+    public function addExtension(Twig_ExtensionInterface $extension)
+    {
+        if ($this->extensionInitialized) {
+            throw new LogicException(sprintf('Unable to register extension "%s" as extensions have already been initialized.', $extension->getName()));
+        }
+
+        $this->extensions[$extension->getName()] = $extension;
+    }
+
+    /**
+     * Removes an extension by name.
+     *
+     * This method is deprecated and you should not use it.
+     *
+     * @param string $name The extension name
+     *
+     * @deprecated since 1.12 (to be removed in 2.0)
+     */
+    public function removeExtension($name)
+    {
+        if ($this->extensionInitialized) {
+            throw new LogicException(sprintf('Unable to remove extension "%s" as extensions have already been initialized.', $name));
+        }
+
+        unset($this->extensions[$name]);
+    }
+
+    /**
+     * Registers an array of extensions.
+     *
+     * @param array $extensions An array of extensions
+     */
+    public function setExtensions(array $extensions)
+    {
+        foreach ($extensions as $extension) {
+            $this->addExtension($extension);
+        }
+    }
+
+    /**
+     * Returns all registered extensions.
+     *
+     * @return array An array of extensions
+     */
+    public function getExtensions()
+    {
+        return $this->extensions;
+    }
+
+    /**
+     * Registers a Token Parser.
+     *
+     * @param Twig_TokenParserInterface $parser A Twig_TokenParserInterface instance
+     */
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        if ($this->extensionInitialized) {
+            throw new LogicException('Unable to add a token parser as extensions have already been initialized.');
+        }
+
+        $this->staging->addTokenParser($parser);
+    }
+
+    /**
+     * Gets the registered Token Parsers.
+     *
+     * @return Twig_TokenParserBrokerInterface A broker containing token parsers
+     */
+    public function getTokenParsers()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->parsers;
+    }
+
+    /**
+     * Gets registered tags.
+     *
+     * Be warned that this method cannot return tags defined by Twig_TokenParserBrokerInterface classes.
+     *
+     * @return Twig_TokenParserInterface[] An array of Twig_TokenParserInterface instances
+     */
+    public function getTags()
+    {
+        $tags = array();
+        foreach ($this->getTokenParsers()->getParsers() as $parser) {
+            if ($parser instanceof Twig_TokenParserInterface) {
+                $tags[$parser->getTag()] = $parser;
+            }
+        }
+
+        return $tags;
+    }
+
+    /**
+     * Registers a Node Visitor.
+     *
+     * @param Twig_NodeVisitorInterface $visitor A Twig_NodeVisitorInterface instance
+     */
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        if ($this->extensionInitialized) {
+            throw new LogicException('Unable to add a node visitor as extensions have already been initialized.', $extension->getName());
+        }
+
+        $this->staging->addNodeVisitor($visitor);
+    }
+
+    /**
+     * Gets the registered Node Visitors.
+     *
+     * @return Twig_NodeVisitorInterface[] An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->visitors;
+    }
+
+    /**
+     * Registers a Filter.
+     *
+     * @param string|Twig_SimpleFilter               $name   The filter name or a Twig_SimpleFilter instance
+     * @param Twig_FilterInterface|Twig_SimpleFilter $filter A Twig_FilterInterface instance or a Twig_SimpleFilter instance
+     */
+    public function addFilter($name, $filter = null)
+    {
+        if (!$name instanceof Twig_SimpleFilter && !($filter instanceof Twig_SimpleFilter || $filter instanceof Twig_FilterInterface)) {
+            throw new LogicException('A filter must be an instance of Twig_FilterInterface or Twig_SimpleFilter');
+        }
+
+        if ($name instanceof Twig_SimpleFilter) {
+            $filter = $name;
+            $name = $filter->getName();
+        }
+        
+        if ($this->extensionInitialized) {
+            throw new LogicException(sprintf('Unable to add filter "%s" as extensions have already been initialized.', $name));
+        }
+        
+        $this->staging->addFilter($name, $filter);
+    }
+
+    /**
+     * Get a filter by name.
+     *
+     * Subclasses may override this method and load filters differently;
+     * so no list of filters is available.
+     *
+     * @param string $name The filter name
+     *
+     * @return Twig_Filter|false A Twig_Filter instance or false if the filter does not exist
+     */
+    public function getFilter($name)
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        if (isset($this->filters[$name])) {
+            return $this->filters[$name];
+        }
+
+        foreach ($this->filters as $pattern => $filter) {
+            $pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
+
+            if ($count) {
+                if (preg_match('#^'.$pattern.'$#', $name, $matches)) {
+                    array_shift($matches);
+                    $filter->setArguments($matches);
+
+                    return $filter;
+                }
+            }
+        }
+
+        foreach ($this->filterCallbacks as $callback) {
+            if (false !== $filter = call_user_func($callback, $name)) {
+                return $filter;
+            }
+        }
+
+        return false;
+    }
+
+    public function registerUndefinedFilterCallback($callable)
+    {
+        $this->filterCallbacks[] = $callable;
+    }
+
+    /**
+     * Gets the registered Filters.
+     *
+     * Be warned that this method cannot return filters defined with registerUndefinedFunctionCallback.
+     *
+     * @return Twig_FilterInterface[] An array of Twig_FilterInterface instances
+     *
+     * @see registerUndefinedFilterCallback
+     */
+    public function getFilters()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->filters;
+    }
+
+    /**
+     * Registers a Test.
+     *
+     * @param string|Twig_SimpleTest             $name The test name or a Twig_SimpleTest instance
+     * @param Twig_TestInterface|Twig_SimpleTest $test A Twig_TestInterface instance or a Twig_SimpleTest instance
+     */
+    public function addTest($name, $test = null)
+    {
+        if (!$name instanceof Twig_SimpleTest && !($test instanceof Twig_SimpleTest || $test instanceof Twig_TestInterface)) {
+            throw new LogicException('A test must be an instance of Twig_TestInterface or Twig_SimpleTest');
+        }
+
+        if ($name instanceof Twig_SimpleTest) {
+            $test = $name;
+            $name = $test->getName();
+        }
+        
+        if ($this->extensionInitialized) {
+            throw new LogicException(sprintf('Unable to add test "%s" as extensions have already been initialized.', $name));
+        }
+
+        $this->staging->addTest($name, $test);
+    }
+
+    /**
+     * Gets the registered Tests.
+     *
+     * @return Twig_TestInterface[] An array of Twig_TestInterface instances
+     */
+    public function getTests()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->tests;
+    }
+
+    /**
+     * Gets a test by name.
+     *
+     * @param string $name The test name
+     *
+     * @return Twig_Test|false A Twig_Test instance or false if the test does not exist
+     */
+    public function getTest($name)
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        if (isset($this->tests[$name])) {
+            return $this->tests[$name];
+        }
+
+        return false;
+    }
+
+    /**
+     * Registers a Function.
+     *
+     * @param string|Twig_SimpleFunction                 $name     The function name or a Twig_SimpleFunction instance
+     * @param Twig_FunctionInterface|Twig_SimpleFunction $function A Twig_FunctionInterface instance or a Twig_SimpleFunction instance
+     */
+    public function addFunction($name, $function = null)
+    {
+        if (!$name instanceof Twig_SimpleFunction && !($function instanceof Twig_SimpleFunction || $function instanceof Twig_FunctionInterface)) {
+            throw new LogicException('A function must be an instance of Twig_FunctionInterface or Twig_SimpleFunction');
+        }
+
+        if ($name instanceof Twig_SimpleFunction) {
+            $function = $name;
+            $name = $function->getName();
+        }
+        
+        if ($this->extensionInitialized) {
+            throw new LogicException(sprintf('Unable to add function "%s" as extensions have already been initialized.', $name));
+        }
+        
+        $this->staging->addFunction($name, $function);
+    }
+
+    /**
+     * Get a function by name.
+     *
+     * Subclasses may override this method and load functions differently;
+     * so no list of functions is available.
+     *
+     * @param string $name function name
+     *
+     * @return Twig_Function|false A Twig_Function instance or false if the function does not exist
+     */
+    public function getFunction($name)
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        if (isset($this->functions[$name])) {
+            return $this->functions[$name];
+        }
+
+        foreach ($this->functions as $pattern => $function) {
+            $pattern = str_replace('\\*', '(.*?)', preg_quote($pattern, '#'), $count);
+
+            if ($count) {
+                if (preg_match('#^'.$pattern.'$#', $name, $matches)) {
+                    array_shift($matches);
+                    $function->setArguments($matches);
+
+                    return $function;
+                }
+            }
+        }
+
+        foreach ($this->functionCallbacks as $callback) {
+            if (false !== $function = call_user_func($callback, $name)) {
+                return $function;
+            }
+        }
+
+        return false;
+    }
+
+    public function registerUndefinedFunctionCallback($callable)
+    {
+        $this->functionCallbacks[] = $callable;
+    }
+
+    /**
+     * Gets registered functions.
+     *
+     * Be warned that this method cannot return functions defined with registerUndefinedFunctionCallback.
+     *
+     * @return Twig_FunctionInterface[] An array of Twig_FunctionInterface instances
+     *
+     * @see registerUndefinedFunctionCallback
+     */
+    public function getFunctions()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->functions;
+    }
+
+    /**
+     * Registers a Global.
+     *
+     * New globals can be added before compiling or rendering a template;
+     * but after, you can only update existing globals.
+     *
+     * @param string $name  The global name
+     * @param mixed  $value The global value
+     */
+    public function addGlobal($name, $value)
+    {
+        if ($this->extensionInitialized || $this->runtimeInitialized) {
+            if (null === $this->globals) {
+                $this->globals = $this->initGlobals();
+            }
+
+            /* This condition must be uncommented in Twig 2.0
+            if (!array_key_exists($name, $this->globals)) {
+                throw new LogicException(sprintf('Unable to add global "%s" as the runtime or the extensions have already been initialized.', $name));
+            }
+            */
+        }
+
+        if ($this->extensionInitialized || $this->runtimeInitialized) {
+            // update the value
+            $this->globals[$name] = $value;
+        } else {
+            $this->staging->addGlobal($name, $value);
+        }
+    }
+
+    /**
+     * Gets the registered Globals.
+     *
+     * @return array An array of globals
+     */
+    public function getGlobals()
+    {
+        if (!$this->runtimeInitialized && !$this->extensionInitialized) {
+            return $this->initGlobals();
+        }
+
+        if (null === $this->globals) {
+            $this->globals = $this->initGlobals();
+        }
+
+        return $this->globals;
+    }
+
+    /**
+     * Merges a context with the defined globals.
+     *
+     * @param array $context An array representing the context
+     *
+     * @return array The context merged with the globals
+     */
+    public function mergeGlobals(array $context)
+    {
+        // we don't use array_merge as the context being generally
+        // bigger than globals, this code is faster.
+        foreach ($this->getGlobals() as $key => $value) {
+            if (!array_key_exists($key, $context)) {
+                $context[$key] = $value;
+            }
+        }
+
+        return $context;
+    }
+
+    /**
+     * Gets the registered unary Operators.
+     *
+     * @return array An array of unary operators
+     */
+    public function getUnaryOperators()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->unaryOperators;
+    }
+
+    /**
+     * Gets the registered binary Operators.
+     *
+     * @return array An array of binary operators
+     */
+    public function getBinaryOperators()
+    {
+        if (!$this->extensionInitialized) {
+            $this->initExtensions();
+        }
+
+        return $this->binaryOperators;
+    }
+
+    public function computeAlternatives($name, $items)
+    {
+        $alternatives = array();
+        foreach ($items as $item) {
+            $lev = levenshtein($name, $item);
+            if ($lev <= strlen($name) / 3 || false !== strpos($item, $name)) {
+                $alternatives[$item] = $lev;
+            }
+        }
+        asort($alternatives);
+
+        return array_keys($alternatives);
+    }
+
+    protected function initGlobals()
+    {
+        $globals = array();
+        foreach ($this->extensions as $extension) {
+            $extGlob = $extension->getGlobals();
+            if (!is_array($extGlob)) {
+                throw new UnexpectedValueException(sprintf('"%s::getGlobals()" must return an array of globals.', get_class($extension)));
+            }
+
+            $globals[] = $extGlob;
+        }
+
+        $globals[] = $this->staging->getGlobals();
+
+        return call_user_func_array('array_merge', $globals);
+    }
+
+    protected function initExtensions()
+    {
+        if ($this->extensionInitialized) {
+            return;
+        }
+
+        $this->extensionInitialized = true;
+        $this->parsers = new Twig_TokenParserBroker();
+        $this->filters = array();
+        $this->functions = array();
+        $this->tests = array();
+        $this->visitors = array();
+        $this->unaryOperators = array();
+        $this->binaryOperators = array();
+
+        foreach ($this->extensions as $extension) {
+            $this->initExtension($extension);
+        }
+        $this->initExtension($this->staging);
+    }
+
+    protected function initExtension(Twig_ExtensionInterface $extension)
+    {
+        // filters
+        foreach ($extension->getFilters() as $name => $filter) {
+            if ($name instanceof Twig_SimpleFilter) {
+                $filter = $name;
+                $name = $filter->getName();
+            } elseif ($filter instanceof Twig_SimpleFilter) {
+                $name = $filter->getName();
+            }
+
+            $this->filters[$name] = $filter;
+        }
+
+        // functions
+        foreach ($extension->getFunctions() as $name => $function) {
+            if ($name instanceof Twig_SimpleFunction) {
+                $function = $name;
+                $name = $function->getName();
+            } elseif ($function instanceof Twig_SimpleFunction) {
+                $name = $function->getName();
+            }
+
+            $this->functions[$name] = $function;
+        }
+
+        // tests
+        foreach ($extension->getTests() as $name => $test) {
+            if ($name instanceof Twig_SimpleTest) {
+                $test = $name;
+                $name = $test->getName();
+            } elseif ($test instanceof Twig_SimpleTest) {
+                $name = $test->getName();
+            }
+
+            $this->tests[$name] = $test;
+        }
+
+        // token parsers
+        foreach ($extension->getTokenParsers() as $parser) {
+            if ($parser instanceof Twig_TokenParserInterface) {
+                $this->parsers->addTokenParser($parser);
+            } elseif ($parser instanceof Twig_TokenParserBrokerInterface) {
+                $this->parsers->addTokenParserBroker($parser);
+            } else {
+                throw new LogicException('getTokenParsers() must return an array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances');
+            }
+        }
+
+        // node visitors
+        foreach ($extension->getNodeVisitors() as $visitor) {
+            $this->visitors[] = $visitor;
+        }
+
+        // operators
+        if ($operators = $extension->getOperators()) {
+            if (2 !== count($operators)) {
+                throw new InvalidArgumentException(sprintf('"%s::getOperators()" does not return a valid operators array.', get_class($extension)));
+            }
+
+            $this->unaryOperators = array_merge($this->unaryOperators, $operators[0]);
+            $this->binaryOperators = array_merge($this->binaryOperators, $operators[1]);
+        }
+    }
+
+    protected function writeCacheFile($file, $content)
+    {
+        $dir = dirname($file);
+        if (!is_dir($dir)) {
+            if (false === @mkdir($dir, 0777, true) && !is_dir($dir)) {
+                throw new RuntimeException(sprintf("Unable to create the cache directory (%s).", $dir));
+            }
+        } elseif (!is_writable($dir)) {
+            throw new RuntimeException(sprintf("Unable to write in the cache directory (%s).", $dir));
+        }
+
+        $tmpFile = tempnam(dirname($file), basename($file));
+        if (false !== @file_put_contents($tmpFile, $content)) {
+            // rename does not work on Win32 before 5.2.6
+            if (@rename($tmpFile, $file) || (@copy($tmpFile, $file) && unlink($tmpFile))) {
+                @chmod($file, 0666 & ~umask());
+
+                return;
+            }
+        }
+
+        throw new RuntimeException(sprintf('Failed to write cache file "%s".', $file));
+    }
+}
diff --git a/inc/Twig/Error.php b/inc/Twig/Error.php
new file mode 100644
index 00000000..72d91a98
--- /dev/null
+++ b/inc/Twig/Error.php
@@ -0,0 +1,239 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig base exception.
+ *
+ * This exception class and its children must only be used when
+ * an error occurs during the loading of a template, when a syntax error
+ * is detected in a template, or when rendering a template. Other
+ * errors must use regular PHP exception classes (like when the template
+ * cache directory is not writable for instance).
+ *
+ * To help debugging template issues, this class tracks the original template
+ * name and line where the error occurred.
+ *
+ * Whenever possible, you must set these information (original template name
+ * and line number) yourself by passing them to the constructor. If some or all
+ * these information are not available from where you throw the exception, then
+ * this class will guess them automatically (when the line number is set to -1
+ * and/or the filename is set to null). As this is a costly operation, this
+ * can be disabled by passing false for both the filename and the line number
+ * when creating a new instance of this class.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error extends Exception
+{
+    protected $lineno;
+    protected $filename;
+    protected $rawMessage;
+    protected $previous;
+
+    /**
+     * Constructor.
+     *
+     * Set both the line number and the filename to false to
+     * disable automatic guessing of the original template name
+     * and line number.
+     *
+     * Set the line number to -1 to enable its automatic guessing.
+     * Set the filename to null to enable its automatic guessing.
+     *
+     * By default, automatic guessing is enabled.
+     *
+     * @param string    $message  The error message
+     * @param integer   $lineno   The template line where the error occurred
+     * @param string    $filename The template file name where the error occurred
+     * @param Exception $previous The previous exception
+     */
+    public function __construct($message, $lineno = -1, $filename = null, Exception $previous = null)
+    {
+        if (version_compare(PHP_VERSION, '5.3.0', '<')) {
+            $this->previous = $previous;
+            parent::__construct('');
+        } else {
+            parent::__construct('', 0, $previous);
+        }
+
+        $this->lineno = $lineno;
+        $this->filename = $filename;
+
+        if (-1 === $this->lineno || null === $this->filename) {
+            $this->guessTemplateInfo();
+        }
+
+        $this->rawMessage = $message;
+
+        $this->updateRepr();
+    }
+
+    /**
+     * Gets the raw message.
+     *
+     * @return string The raw message
+     */
+    public function getRawMessage()
+    {
+        return $this->rawMessage;
+    }
+
+    /**
+     * Gets the filename where the error occurred.
+     *
+     * @return string The filename
+     */
+    public function getTemplateFile()
+    {
+        return $this->filename;
+    }
+
+    /**
+     * Sets the filename where the error occurred.
+     *
+     * @param string $filename The filename
+     */
+    public function setTemplateFile($filename)
+    {
+        $this->filename = $filename;
+
+        $this->updateRepr();
+    }
+
+    /**
+     * Gets the template line where the error occurred.
+     *
+     * @return integer The template line
+     */
+    public function getTemplateLine()
+    {
+        return $this->lineno;
+    }
+
+    /**
+     * Sets the template line where the error occurred.
+     *
+     * @param integer $lineno The template line
+     */
+    public function setTemplateLine($lineno)
+    {
+        $this->lineno = $lineno;
+
+        $this->updateRepr();
+    }
+
+    public function guess()
+    {
+        $this->guessTemplateInfo();
+        $this->updateRepr();
+    }
+
+    /**
+     * For PHP < 5.3.0, provides access to the getPrevious() method.
+     *
+     * @param string $method    The method name
+     * @param array  $arguments The parameters to be passed to the method
+     *
+     * @return Exception The previous exception or null
+     *
+     * @throws BadMethodCallException
+     */
+    public function __call($method, $arguments)
+    {
+        if ('getprevious' == strtolower($method)) {
+            return $this->previous;
+        }
+
+        throw new BadMethodCallException(sprintf('Method "Twig_Error::%s()" does not exist.', $method));
+    }
+
+    protected function updateRepr()
+    {
+        $this->message = $this->rawMessage;
+
+        $dot = false;
+        if ('.' === substr($this->message, -1)) {
+            $this->message = substr($this->message, 0, -1);
+            $dot = true;
+        }
+
+        if ($this->filename) {
+            if (is_string($this->filename) || (is_object($this->filename) && method_exists($this->filename, '__toString'))) {
+                $filename = sprintf('"%s"', $this->filename);
+            } else {
+                $filename = json_encode($this->filename);
+            }
+            $this->message .= sprintf(' in %s', $filename);
+        }
+
+        if ($this->lineno && $this->lineno >= 0) {
+            $this->message .= sprintf(' at line %d', $this->lineno);
+        }
+
+        if ($dot) {
+            $this->message .= '.';
+        }
+    }
+
+    protected function guessTemplateInfo()
+    {
+        $template = null;
+
+        if (version_compare(phpversion(), '5.3.6', '>=')) {
+            $backtrace = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS | DEBUG_BACKTRACE_PROVIDE_OBJECT);
+        } else {
+            $backtrace = debug_backtrace();
+        }
+
+        foreach ($backtrace as $trace) {
+            if (isset($trace['object']) && $trace['object'] instanceof Twig_Template && 'Twig_Template' !== get_class($trace['object'])) {
+                if (null === $this->filename || $this->filename == $trace['object']->getTemplateName()) {
+                    $template = $trace['object'];
+                }
+            }
+        }
+
+        // update template filename
+        if (null !== $template && null === $this->filename) {
+            $this->filename = $template->getTemplateName();
+        }
+
+        if (null === $template || $this->lineno > -1) {
+            return;
+        }
+
+        $r = new ReflectionObject($template);
+        $file = $r->getFileName();
+
+        $exceptions = array($e = $this);
+        while (($e instanceof self || method_exists($e, 'getPrevious')) && $e = $e->getPrevious()) {
+            $exceptions[] = $e;
+        }
+
+        while ($e = array_pop($exceptions)) {
+            $traces = $e->getTrace();
+            while ($trace = array_shift($traces)) {
+                if (!isset($trace['file']) || !isset($trace['line']) || $file != $trace['file']) {
+                    continue;
+                }
+
+                foreach ($template->getDebugInfo() as $codeLine => $templateLine) {
+                    if ($codeLine <= $trace['line']) {
+                        // update template line
+                        $this->lineno = $templateLine;
+
+                        return;
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/inc/Twig/Error/Loader.php b/inc/Twig/Error/Loader.php
new file mode 100644
index 00000000..68efb574
--- /dev/null
+++ b/inc/Twig/Error/Loader.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when an error occurs during template loading.
+ *
+ * Automatic template information guessing is always turned off as
+ * if a template cannot be loaded, there is nothing to guess.
+ * However, when a template is loaded from another one, then, we need
+ * to find the current context and this is automatically done by
+ * Twig_Template::displayWithErrorHandling().
+ *
+ * This strategy makes Twig_Environment::resolveTemplate() much faster.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Loader extends Twig_Error
+{
+    public function __construct($message, $lineno = -1, $filename = null, Exception $previous = null)
+    {
+        parent::__construct($message, false, false, $previous);
+    }
+}
diff --git a/inc/Twig/Error/Runtime.php b/inc/Twig/Error/Runtime.php
new file mode 100644
index 00000000..8b6ceddb
--- /dev/null
+++ b/inc/Twig/Error/Runtime.php
@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when an error occurs at runtime.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Runtime extends Twig_Error
+{
+}
diff --git a/inc/Twig/Error/Syntax.php b/inc/Twig/Error/Syntax.php
new file mode 100644
index 00000000..0f5c5792
--- /dev/null
+++ b/inc/Twig/Error/Syntax.php
@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when a syntax error occurs during lexing or parsing of a template.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Error_Syntax extends Twig_Error
+{
+}
diff --git a/inc/Twig/ExistsLoaderInterface.php b/inc/Twig/ExistsLoaderInterface.php
new file mode 100644
index 00000000..ce434765
--- /dev/null
+++ b/inc/Twig/ExistsLoaderInterface.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Adds an exists() method for loaders.
+ *
+ * @author Florin Patan <florinpatan@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_ExistsLoaderInterface
+{
+    /**
+     * Check if we have the source code of a template, given its name.
+     *
+     * @param string $name The name of the template to check if we can load
+     *
+     * @return boolean If the template source code is handled by this loader or not
+     */
+    public function exists($name);
+}
diff --git a/inc/Twig/ExpressionParser.php b/inc/Twig/ExpressionParser.php
new file mode 100644
index 00000000..9cf19344
--- /dev/null
+++ b/inc/Twig/ExpressionParser.php
@@ -0,0 +1,600 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Parses expressions.
+ *
+ * This parser implements a "Precedence climbing" algorithm.
+ *
+ * @see http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm
+ * @see http://en.wikipedia.org/wiki/Operator-precedence_parser
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_ExpressionParser
+{
+    const OPERATOR_LEFT = 1;
+    const OPERATOR_RIGHT = 2;
+
+    protected $parser;
+    protected $unaryOperators;
+    protected $binaryOperators;
+
+    public function __construct(Twig_Parser $parser, array $unaryOperators, array $binaryOperators)
+    {
+        $this->parser = $parser;
+        $this->unaryOperators = $unaryOperators;
+        $this->binaryOperators = $binaryOperators;
+    }
+
+    public function parseExpression($precedence = 0)
+    {
+        $expr = $this->getPrimary();
+        $token = $this->parser->getCurrentToken();
+        while ($this->isBinary($token) && $this->binaryOperators[$token->getValue()]['precedence'] >= $precedence) {
+            $op = $this->binaryOperators[$token->getValue()];
+            $this->parser->getStream()->next();
+
+            if (isset($op['callable'])) {
+                $expr = call_user_func($op['callable'], $this->parser, $expr);
+            } else {
+                $expr1 = $this->parseExpression(self::OPERATOR_LEFT === $op['associativity'] ? $op['precedence'] + 1 : $op['precedence']);
+                $class = $op['class'];
+                $expr = new $class($expr, $expr1, $token->getLine());
+            }
+
+            $token = $this->parser->getCurrentToken();
+        }
+
+        if (0 === $precedence) {
+            return $this->parseConditionalExpression($expr);
+        }
+
+        return $expr;
+    }
+
+    protected function getPrimary()
+    {
+        $token = $this->parser->getCurrentToken();
+
+        if ($this->isUnary($token)) {
+            $operator = $this->unaryOperators[$token->getValue()];
+            $this->parser->getStream()->next();
+            $expr = $this->parseExpression($operator['precedence']);
+            $class = $operator['class'];
+
+            return $this->parsePostfixExpression(new $class($expr, $token->getLine()));
+        } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+            $this->parser->getStream()->next();
+            $expr = $this->parseExpression();
+            $this->parser->getStream()->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'An opened parenthesis is not properly closed');
+
+            return $this->parsePostfixExpression($expr);
+        }
+
+        return $this->parsePrimaryExpression();
+    }
+
+    protected function parseConditionalExpression($expr)
+    {
+        while ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '?')) {
+            $this->parser->getStream()->next();
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                $expr2 = $this->parseExpression();
+                if ($this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                    $this->parser->getStream()->next();
+                    $expr3 = $this->parseExpression();
+                } else {
+                    $expr3 = new Twig_Node_Expression_Constant('', $this->parser->getCurrentToken()->getLine());
+                }
+            } else {
+                $this->parser->getStream()->next();
+                $expr2 = $expr;
+                $expr3 = $this->parseExpression();
+            }
+
+            $expr = new Twig_Node_Expression_Conditional($expr, $expr2, $expr3, $this->parser->getCurrentToken()->getLine());
+        }
+
+        return $expr;
+    }
+
+    protected function isUnary(Twig_Token $token)
+    {
+        return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->unaryOperators[$token->getValue()]);
+    }
+
+    protected function isBinary(Twig_Token $token)
+    {
+        return $token->test(Twig_Token::OPERATOR_TYPE) && isset($this->binaryOperators[$token->getValue()]);
+    }
+
+    public function parsePrimaryExpression()
+    {
+        $token = $this->parser->getCurrentToken();
+        switch ($token->getType()) {
+            case Twig_Token::NAME_TYPE:
+                $this->parser->getStream()->next();
+                switch ($token->getValue()) {
+                    case 'true':
+                    case 'TRUE':
+                        $node = new Twig_Node_Expression_Constant(true, $token->getLine());
+                        break;
+
+                    case 'false':
+                    case 'FALSE':
+                        $node = new Twig_Node_Expression_Constant(false, $token->getLine());
+                        break;
+
+                    case 'none':
+                    case 'NONE':
+                    case 'null':
+                    case 'NULL':
+                        $node = new Twig_Node_Expression_Constant(null, $token->getLine());
+                        break;
+
+                    default:
+                        if ('(' === $this->parser->getCurrentToken()->getValue()) {
+                            $node = $this->getFunctionNode($token->getValue(), $token->getLine());
+                        } else {
+                            $node = new Twig_Node_Expression_Name($token->getValue(), $token->getLine());
+                        }
+                }
+                break;
+
+            case Twig_Token::NUMBER_TYPE:
+                $this->parser->getStream()->next();
+                $node = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+                break;
+
+            case Twig_Token::STRING_TYPE:
+            case Twig_Token::INTERPOLATION_START_TYPE:
+                $node = $this->parseStringExpression();
+                break;
+
+            default:
+                if ($token->test(Twig_Token::PUNCTUATION_TYPE, '[')) {
+                    $node = $this->parseArrayExpression();
+                } elseif ($token->test(Twig_Token::PUNCTUATION_TYPE, '{')) {
+                    $node = $this->parseHashExpression();
+                } else {
+                    throw new Twig_Error_Syntax(sprintf('Unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($token->getType(), $token->getLine()), $token->getValue()), $token->getLine(), $this->parser->getFilename());
+                }
+        }
+
+        return $this->parsePostfixExpression($node);
+    }
+
+    public function parseStringExpression()
+    {
+        $stream = $this->parser->getStream();
+
+        $nodes = array();
+        // a string cannot be followed by another string in a single expression
+        $nextCanBeString = true;
+        while (true) {
+            if ($stream->test(Twig_Token::STRING_TYPE) && $nextCanBeString) {
+                $token = $stream->next();
+                $nodes[] = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+                $nextCanBeString = false;
+            } elseif ($stream->test(Twig_Token::INTERPOLATION_START_TYPE)) {
+                $stream->next();
+                $nodes[] = $this->parseExpression();
+                $stream->expect(Twig_Token::INTERPOLATION_END_TYPE);
+                $nextCanBeString = true;
+            } else {
+                break;
+            }
+        }
+
+        $expr = array_shift($nodes);
+        foreach ($nodes as $node) {
+            $expr = new Twig_Node_Expression_Binary_Concat($expr, $node, $node->getLine());
+        }
+
+        return $expr;
+    }
+
+    public function parseArrayExpression()
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '[', 'An array element was expected');
+
+        $node = new Twig_Node_Expression_Array(array(), $stream->getCurrent()->getLine());
+        $first = true;
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+            if (!$first) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'An array element must be followed by a comma');
+
+                // trailing ,?
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+                    break;
+                }
+            }
+            $first = false;
+
+            $node->addElement($this->parseExpression());
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']', 'An opened array is not properly closed');
+
+        return $node;
+    }
+
+    public function parseHashExpression()
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '{', 'A hash element was expected');
+
+        $node = new Twig_Node_Expression_Array(array(), $stream->getCurrent()->getLine());
+        $first = true;
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
+            if (!$first) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'A hash value must be followed by a comma');
+
+                // trailing ,?
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '}')) {
+                    break;
+                }
+            }
+            $first = false;
+
+            // a hash key can be:
+            //
+            //  * a number -- 12
+            //  * a string -- 'a'
+            //  * a name, which is equivalent to a string -- a
+            //  * an expression, which must be enclosed in parentheses -- (1 + 2)
+            if ($stream->test(Twig_Token::STRING_TYPE) || $stream->test(Twig_Token::NAME_TYPE) || $stream->test(Twig_Token::NUMBER_TYPE)) {
+                $token = $stream->next();
+                $key = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+            } elseif ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                $key = $this->parseExpression();
+            } else {
+                $current = $stream->getCurrent();
+
+                throw new Twig_Error_Syntax(sprintf('A hash key must be a quoted string, a number, a name, or an expression enclosed in parentheses (unexpected token "%s" of value "%s"', Twig_Token::typeToEnglish($current->getType(), $current->getLine()), $current->getValue()), $current->getLine(), $this->parser->getFilename());
+            }
+
+            $stream->expect(Twig_Token::PUNCTUATION_TYPE, ':', 'A hash key must be followed by a colon (:)');
+            $value = $this->parseExpression();
+
+            $node->addElement($value, $key);
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '}', 'An opened hash is not properly closed');
+
+        return $node;
+    }
+
+    public function parsePostfixExpression($node)
+    {
+        while (true) {
+            $token = $this->parser->getCurrentToken();
+            if ($token->getType() == Twig_Token::PUNCTUATION_TYPE) {
+                if ('.' == $token->getValue() || '[' == $token->getValue()) {
+                    $node = $this->parseSubscriptExpression($node);
+                } elseif ('|' == $token->getValue()) {
+                    $node = $this->parseFilterExpression($node);
+                } else {
+                    break;
+                }
+            } else {
+                break;
+            }
+        }
+
+        return $node;
+    }
+
+    public function getFunctionNode($name, $line)
+    {
+        switch ($name) {
+            case 'parent':
+                $args = $this->parseArguments();
+                if (!count($this->parser->getBlockStack())) {
+                    throw new Twig_Error_Syntax('Calling "parent" outside a block is forbidden', $line, $this->parser->getFilename());
+                }
+
+                if (!$this->parser->getParent() && !$this->parser->hasTraits()) {
+                    throw new Twig_Error_Syntax('Calling "parent" on a template that does not extend nor "use" another template is forbidden', $line, $this->parser->getFilename());
+                }
+
+                return new Twig_Node_Expression_Parent($this->parser->peekBlockStack(), $line);
+            case 'block':
+                return new Twig_Node_Expression_BlockReference($this->parseArguments()->getNode(0), false, $line);
+            case 'attribute':
+                $args = $this->parseArguments();
+                if (count($args) < 2) {
+                    throw new Twig_Error_Syntax('The "attribute" function takes at least two arguments (the variable and the attributes)', $line, $this->parser->getFilename());
+                }
+
+                return new Twig_Node_Expression_GetAttr($args->getNode(0), $args->getNode(1), count($args) > 2 ? $args->getNode(2) : new Twig_Node_Expression_Array(array(), $line), Twig_TemplateInterface::ANY_CALL, $line);
+            default:
+                if (null !== $alias = $this->parser->getImportedSymbol('function', $name)) {
+                    $arguments = new Twig_Node_Expression_Array(array(), $line);
+                    foreach ($this->parseArguments() as $n) {
+                        $arguments->addElement($n);
+                    }
+
+                    $node = new Twig_Node_Expression_MethodCall($alias['node'], $alias['name'], $arguments, $line);
+                    $node->setAttribute('safe', true);
+
+                    return $node;
+                }
+
+                $args = $this->parseArguments(true);
+                $class = $this->getFunctionNodeClass($name, $line);
+
+                return new $class($name, $args, $line);
+        }
+    }
+
+    public function parseSubscriptExpression($node)
+    {
+        $stream = $this->parser->getStream();
+        $token = $stream->next();
+        $lineno = $token->getLine();
+        $arguments = new Twig_Node_Expression_Array(array(), $lineno);
+        $type = Twig_TemplateInterface::ANY_CALL;
+        if ($token->getValue() == '.') {
+            $token = $stream->next();
+            if (
+                $token->getType() == Twig_Token::NAME_TYPE
+                ||
+                $token->getType() == Twig_Token::NUMBER_TYPE
+                ||
+                ($token->getType() == Twig_Token::OPERATOR_TYPE && preg_match(Twig_Lexer::REGEX_NAME, $token->getValue()))
+            ) {
+                $arg = new Twig_Node_Expression_Constant($token->getValue(), $lineno);
+
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                    $type = Twig_TemplateInterface::METHOD_CALL;
+                    foreach ($this->parseArguments() as $n) {
+                        $arguments->addElement($n);
+                    }
+                }
+            } else {
+                throw new Twig_Error_Syntax('Expected name or number', $lineno, $this->parser->getFilename());
+            }
+
+            if ($node instanceof Twig_Node_Expression_Name && null !== $this->parser->getImportedSymbol('template', $node->getAttribute('name'))) {
+                if (!$arg instanceof Twig_Node_Expression_Constant) {
+                    throw new Twig_Error_Syntax(sprintf('Dynamic macro names are not supported (called on "%s")', $node->getAttribute('name')), $token->getLine(), $this->parser->getFilename());
+                }
+
+                $node = new Twig_Node_Expression_MethodCall($node, 'get'.$arg->getAttribute('value'), $arguments, $lineno);
+                $node->setAttribute('safe', true);
+
+                return $node;
+            }
+        } else {
+            $type = Twig_TemplateInterface::ARRAY_CALL;
+
+            // slice?
+            $slice = false;
+            if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                $slice = true;
+                $arg = new Twig_Node_Expression_Constant(0, $token->getLine());
+            } else {
+                $arg = $this->parseExpression();
+            }
+
+            if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ':')) {
+                $slice = true;
+                $stream->next();
+            }
+
+            if ($slice) {
+                if ($stream->test(Twig_Token::PUNCTUATION_TYPE, ']')) {
+                    $length = new Twig_Node_Expression_Constant(null, $token->getLine());
+                } else {
+                    $length = $this->parseExpression();
+                }
+
+                $class = $this->getFilterNodeClass('slice', $token->getLine());
+                $arguments = new Twig_Node(array($arg, $length));
+                $filter = new $class($node, new Twig_Node_Expression_Constant('slice', $token->getLine()), $arguments, $token->getLine());
+
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
+
+                return $filter;
+            }
+
+            $stream->expect(Twig_Token::PUNCTUATION_TYPE, ']');
+        }
+
+        return new Twig_Node_Expression_GetAttr($node, $arg, $arguments, $type, $lineno);
+    }
+
+    public function parseFilterExpression($node)
+    {
+        $this->parser->getStream()->next();
+
+        return $this->parseFilterExpressionRaw($node);
+    }
+
+    public function parseFilterExpressionRaw($node, $tag = null)
+    {
+        while (true) {
+            $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE);
+
+            $name = new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+                $arguments = new Twig_Node();
+            } else {
+                $arguments = $this->parseArguments(true);
+            }
+
+            $class = $this->getFilterNodeClass($name->getAttribute('value'), $token->getLine());
+
+            $node = new $class($node, $name, $arguments, $token->getLine(), $tag);
+
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, '|')) {
+                break;
+            }
+
+            $this->parser->getStream()->next();
+        }
+
+        return $node;
+    }
+
+    /**
+     * Parses arguments.
+     *
+     * @param Boolean $namedArguments Whether to allow named arguments or not
+     * @param Boolean $definition     Whether we are parsing arguments for a function definition
+     */
+    public function parseArguments($namedArguments = false, $definition = false)
+    {
+        $args = array();
+        $stream = $this->parser->getStream();
+
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, '(', 'A list of arguments must begin with an opening parenthesis');
+        while (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ')')) {
+            if (!empty($args)) {
+                $stream->expect(Twig_Token::PUNCTUATION_TYPE, ',', 'Arguments must be separated by a comma');
+            }
+
+            if ($definition) {
+                $token = $stream->expect(Twig_Token::NAME_TYPE, null, 'An argument must be a name');
+                $value = new Twig_Node_Expression_Name($token->getValue(), $this->parser->getCurrentToken()->getLine());
+            } else {
+                $value = $this->parseExpression();
+            }
+
+            $name = null;
+            if ($namedArguments && $stream->test(Twig_Token::OPERATOR_TYPE, '=')) {
+                $token = $stream->next();
+                if (!$value instanceof Twig_Node_Expression_Name) {
+                    throw new Twig_Error_Syntax(sprintf('A parameter name must be a string, "%s" given', get_class($value)), $token->getLine(), $this->parser->getFilename());
+                }
+                $name = $value->getAttribute('name');
+
+                if ($definition) {
+                    $value = $this->parsePrimaryExpression();
+
+                    if (!$this->checkConstantExpression($value)) {
+                        throw new Twig_Error_Syntax(sprintf('A default value for an argument must be a constant (a boolean, a string, a number, or an array).'), $token->getLine(), $this->parser->getFilename());
+                    }
+                } else {
+                    $value = $this->parseExpression();
+                }
+            }
+
+            if ($definition) {
+                if (null === $name) {
+                    $name = $value->getAttribute('name');
+                    $value = new Twig_Node_Expression_Constant(null, $this->parser->getCurrentToken()->getLine());
+                }
+                $args[$name] = $value;
+            } else {
+                if (null === $name) {
+                    $args[] = $value;
+                } else {
+                    $args[$name] = $value;
+                }
+            }
+        }
+        $stream->expect(Twig_Token::PUNCTUATION_TYPE, ')', 'A list of arguments must be closed by a parenthesis');
+
+        return new Twig_Node($args);
+    }
+
+    public function parseAssignmentExpression()
+    {
+        $targets = array();
+        while (true) {
+            $token = $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, null, 'Only variables can be assigned to');
+            if (in_array($token->getValue(), array('true', 'false', 'none'))) {
+                throw new Twig_Error_Syntax(sprintf('You cannot assign a value to "%s"', $token->getValue()), $token->getLine(), $this->parser->getFilename());
+            }
+            $targets[] = new Twig_Node_Expression_AssignName($token->getValue(), $token->getLine());
+
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+            $this->parser->getStream()->next();
+        }
+
+        return new Twig_Node($targets);
+    }
+
+    public function parseMultitargetExpression()
+    {
+        $targets = array();
+        while (true) {
+            $targets[] = $this->parseExpression();
+            if (!$this->parser->getStream()->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+            $this->parser->getStream()->next();
+        }
+
+        return new Twig_Node($targets);
+    }
+
+    protected function getFunctionNodeClass($name, $line)
+    {
+        $env = $this->parser->getEnvironment();
+
+        if (false === $function = $env->getFunction($name)) {
+            $message = sprintf('The function "%s" does not exist', $name);
+            if ($alternatives = $env->computeAlternatives($name, array_keys($env->getFunctions()))) {
+                $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
+            }
+
+            throw new Twig_Error_Syntax($message, $line, $this->parser->getFilename());
+        }
+
+        if ($function instanceof Twig_SimpleFunction) {
+            return $function->getNodeClass();
+        }
+
+        return $function instanceof Twig_Function_Node ? $function->getClass() : 'Twig_Node_Expression_Function';
+    }
+
+    protected function getFilterNodeClass($name, $line)
+    {
+        $env = $this->parser->getEnvironment();
+
+        if (false === $filter = $env->getFilter($name)) {
+            $message = sprintf('The filter "%s" does not exist', $name);
+            if ($alternatives = $env->computeAlternatives($name, array_keys($env->getFilters()))) {
+                $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
+            }
+
+            throw new Twig_Error_Syntax($message, $line, $this->parser->getFilename());
+        }
+
+        if ($filter instanceof Twig_SimpleFilter) {
+            return $filter->getNodeClass();
+        }
+
+        return $filter instanceof Twig_Filter_Node ? $filter->getClass() : 'Twig_Node_Expression_Filter';
+    }
+
+    // checks that the node only contains "constant" elements
+    protected function checkConstantExpression(Twig_NodeInterface $node)
+    {
+        if (!($node instanceof Twig_Node_Expression_Constant || $node instanceof Twig_Node_Expression_Array)) {
+            return false;
+        }
+
+        foreach ($node as $n) {
+            if (!$this->checkConstantExpression($n)) {
+                return false;
+            }
+        }
+
+        return true;
+    }
+}
diff --git a/inc/Twig/Extension.php b/inc/Twig/Extension.php
new file mode 100644
index 00000000..931fc033
--- /dev/null
+++ b/inc/Twig/Extension.php
@@ -0,0 +1,93 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Extension implements Twig_ExtensionInterface
+{
+    /**
+     * Initializes the runtime environment.
+     *
+     * This is where you can load some file that contains filter functions for instance.
+     *
+     * @param Twig_Environment $environment The current Twig_Environment instance
+     */
+    public function initRuntime(Twig_Environment $environment)
+    {
+    }
+
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers()
+    {
+        return array();
+    }
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return array An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of tests to add to the existing list.
+     *
+     * @return array An array of tests
+     */
+    public function getTests()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of functions to add to the existing list.
+     *
+     * @return array An array of functions
+     */
+    public function getFunctions()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of operators to add to the existing list.
+     *
+     * @return array An array of operators
+     */
+    public function getOperators()
+    {
+        return array();
+    }
+
+    /**
+     * Returns a list of global variables to add to the existing list.
+     *
+     * @return array An array of global variables
+     */
+    public function getGlobals()
+    {
+        return array();
+    }
+}
diff --git a/inc/Twig/Extension/Core.php b/inc/Twig/Extension/Core.php
new file mode 100644
index 00000000..e68687b4
--- /dev/null
+++ b/inc/Twig/Extension/Core.php
@@ -0,0 +1,1355 @@
+<?php
+
+if (!defined('ENT_SUBSTITUTE')) {
+    define('ENT_SUBSTITUTE', 8);
+}
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Core extends Twig_Extension
+{
+    protected $dateFormats = array('F j, Y H:i', '%d days');
+    protected $numberFormat = array(0, '.', ',');
+    protected $timezone = null;
+
+    /**
+     * Sets the default format to be used by the date filter.
+     *
+     * @param string $format             The default date format string
+     * @param string $dateIntervalFormat The default date interval format string
+     */
+    public function setDateFormat($format = null, $dateIntervalFormat = null)
+    {
+        if (null !== $format) {
+            $this->dateFormats[0] = $format;
+        }
+
+        if (null !== $dateIntervalFormat) {
+            $this->dateFormats[1] = $dateIntervalFormat;
+        }
+    }
+
+    /**
+     * Gets the default format to be used by the date filter.
+     *
+     * @return array The default date format string and the default date interval format string
+     */
+    public function getDateFormat()
+    {
+        return $this->dateFormats;
+    }
+
+    /**
+     * Sets the default timezone to be used by the date filter.
+     *
+     * @param DateTimeZone|string $timezone The default timezone string or a DateTimeZone object
+     */
+    public function setTimezone($timezone)
+    {
+        $this->timezone = $timezone instanceof DateTimeZone ? $timezone : new DateTimeZone($timezone);
+    }
+
+    /**
+     * Gets the default timezone to be used by the date filter.
+     *
+     * @return DateTimeZone The default timezone currently in use
+     */
+    public function getTimezone()
+    {
+        if (null === $this->timezone) {
+            $this->timezone = new DateTimeZone(date_default_timezone_get());
+        }
+
+        return $this->timezone;
+    }
+
+    /**
+     * Sets the default format to be used by the number_format filter.
+     *
+     * @param integer $decimal      The number of decimal places to use.
+     * @param string  $decimalPoint The character(s) to use for the decimal point.
+     * @param string  $thousandSep  The character(s) to use for the thousands separator.
+     */
+    public function setNumberFormat($decimal, $decimalPoint, $thousandSep)
+    {
+        $this->numberFormat = array($decimal, $decimalPoint, $thousandSep);
+    }
+
+    /**
+     * Get the default format used by the number_format filter.
+     *
+     * @return array The arguments for number_format()
+     */
+    public function getNumberFormat()
+    {
+        return $this->numberFormat;
+    }
+
+    /**
+     * Returns the token parser instance to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParser instances
+     */
+    public function getTokenParsers()
+    {
+        return array(
+            new Twig_TokenParser_For(),
+            new Twig_TokenParser_If(),
+            new Twig_TokenParser_Extends(),
+            new Twig_TokenParser_Include(),
+            new Twig_TokenParser_Block(),
+            new Twig_TokenParser_Use(),
+            new Twig_TokenParser_Filter(),
+            new Twig_TokenParser_Macro(),
+            new Twig_TokenParser_Import(),
+            new Twig_TokenParser_From(),
+            new Twig_TokenParser_Set(),
+            new Twig_TokenParser_Spaceless(),
+            new Twig_TokenParser_Flush(),
+            new Twig_TokenParser_Do(),
+            new Twig_TokenParser_Embed(),
+        );
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters()
+    {
+        $filters = array(
+            // formatting filters
+            new Twig_SimpleFilter('date', 'twig_date_format_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('date_modify', 'twig_date_modify_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('format', 'sprintf'),
+            new Twig_SimpleFilter('replace', 'strtr'),
+            new Twig_SimpleFilter('number_format', 'twig_number_format_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('abs', 'abs'),
+
+            // encoding
+            new Twig_SimpleFilter('url_encode', 'twig_urlencode_filter'),
+            new Twig_SimpleFilter('json_encode', 'twig_jsonencode_filter'),
+            new Twig_SimpleFilter('convert_encoding', 'twig_convert_encoding'),
+
+            // string filters
+            new Twig_SimpleFilter('title', 'twig_title_string_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('capitalize', 'twig_capitalize_string_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('upper', 'strtoupper'),
+            new Twig_SimpleFilter('lower', 'strtolower'),
+            new Twig_SimpleFilter('striptags', 'strip_tags'),
+            new Twig_SimpleFilter('trim', 'trim'),
+            new Twig_SimpleFilter('nl2br', 'nl2br', array('pre_escape' => 'html', 'is_safe' => array('html'))),
+
+            // array helpers
+            new Twig_SimpleFilter('join', 'twig_join_filter'),
+            new Twig_SimpleFilter('split', 'twig_split_filter'),
+            new Twig_SimpleFilter('sort', 'twig_sort_filter'),
+            new Twig_SimpleFilter('merge', 'twig_array_merge'),
+            new Twig_SimpleFilter('batch', 'twig_array_batch'),
+
+            // string/array filters
+            new Twig_SimpleFilter('reverse', 'twig_reverse_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('length', 'twig_length_filter', array('needs_environment' => true)),
+            new Twig_SimpleFilter('slice', 'twig_slice', array('needs_environment' => true)),
+            new Twig_SimpleFilter('first', 'twig_first', array('needs_environment' => true)),
+            new Twig_SimpleFilter('last', 'twig_last', array('needs_environment' => true)),
+
+            // iteration and runtime
+            new Twig_SimpleFilter('default', '_twig_default_filter', array('node_class' => 'Twig_Node_Expression_Filter_Default')),
+            new Twig_SimpleFilter('keys', 'twig_get_array_keys_filter'),
+
+            // escaping
+            new Twig_SimpleFilter('escape', 'twig_escape_filter', array('needs_environment' => true, 'is_safe_callback' => 'twig_escape_filter_is_safe')),
+            new Twig_SimpleFilter('e', 'twig_escape_filter', array('needs_environment' => true, 'is_safe_callback' => 'twig_escape_filter_is_safe')),
+        );
+
+        if (function_exists('mb_get_info')) {
+            $filters[] = new Twig_SimpleFilter('upper', 'twig_upper_filter', array('needs_environment' => true));
+            $filters[] = new Twig_SimpleFilter('lower', 'twig_lower_filter', array('needs_environment' => true));
+        }
+
+        return $filters;
+    }
+
+    /**
+     * Returns a list of global functions to add to the existing list.
+     *
+     * @return array An array of global functions
+     */
+    public function getFunctions()
+    {
+        return array(
+            new Twig_SimpleFunction('range', 'range'),
+            new Twig_SimpleFunction('constant', 'twig_constant'),
+            new Twig_SimpleFunction('cycle', 'twig_cycle'),
+            new Twig_SimpleFunction('random', 'twig_random', array('needs_environment' => true)),
+            new Twig_SimpleFunction('date', 'twig_date_converter', array('needs_environment' => true)),
+            new Twig_SimpleFunction('include', 'twig_include', array('needs_environment' => true, 'needs_context' => true, 'is_safe' => array('all'))),
+        );
+    }
+
+    /**
+     * Returns a list of tests to add to the existing list.
+     *
+     * @return array An array of tests
+     */
+    public function getTests()
+    {
+        return array(
+            new Twig_SimpleTest('even', null, array('node_class' => 'Twig_Node_Expression_Test_Even')),
+            new Twig_SimpleTest('odd', null, array('node_class' => 'Twig_Node_Expression_Test_Odd')),
+            new Twig_SimpleTest('defined', null, array('node_class' => 'Twig_Node_Expression_Test_Defined')),
+            new Twig_SimpleTest('sameas', null, array('node_class' => 'Twig_Node_Expression_Test_Sameas')),
+            new Twig_SimpleTest('none', null, array('node_class' => 'Twig_Node_Expression_Test_Null')),
+            new Twig_SimpleTest('null', null, array('node_class' => 'Twig_Node_Expression_Test_Null')),
+            new Twig_SimpleTest('divisibleby', null, array('node_class' => 'Twig_Node_Expression_Test_Divisibleby')),
+            new Twig_SimpleTest('constant', null, array('node_class' => 'Twig_Node_Expression_Test_Constant')),
+            new Twig_SimpleTest('empty', 'twig_test_empty'),
+            new Twig_SimpleTest('iterable', 'twig_test_iterable'),
+        );
+    }
+
+    /**
+     * Returns a list of operators to add to the existing list.
+     *
+     * @return array An array of operators
+     */
+    public function getOperators()
+    {
+        return array(
+            array(
+                'not' => array('precedence' => 50, 'class' => 'Twig_Node_Expression_Unary_Not'),
+                '-'   => array('precedence' => 500, 'class' => 'Twig_Node_Expression_Unary_Neg'),
+                '+'   => array('precedence' => 500, 'class' => 'Twig_Node_Expression_Unary_Pos'),
+            ),
+            array(
+                'or'     => array('precedence' => 10, 'class' => 'Twig_Node_Expression_Binary_Or', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'and'    => array('precedence' => 15, 'class' => 'Twig_Node_Expression_Binary_And', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'b-or'   => array('precedence' => 16, 'class' => 'Twig_Node_Expression_Binary_BitwiseOr', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'b-xor'  => array('precedence' => 17, 'class' => 'Twig_Node_Expression_Binary_BitwiseXor', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'b-and'  => array('precedence' => 18, 'class' => 'Twig_Node_Expression_Binary_BitwiseAnd', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '=='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Equal', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '!='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotEqual', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '<'      => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Less', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '>'      => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_Greater', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '>='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_GreaterEqual', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '<='     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_LessEqual', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'not in' => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_NotIn', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'in'     => array('precedence' => 20, 'class' => 'Twig_Node_Expression_Binary_In', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '..'     => array('precedence' => 25, 'class' => 'Twig_Node_Expression_Binary_Range', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '+'      => array('precedence' => 30, 'class' => 'Twig_Node_Expression_Binary_Add', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '-'      => array('precedence' => 30, 'class' => 'Twig_Node_Expression_Binary_Sub', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '~'      => array('precedence' => 40, 'class' => 'Twig_Node_Expression_Binary_Concat', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '*'      => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mul', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '/'      => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Div', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '//'     => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_FloorDiv', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '%'      => array('precedence' => 60, 'class' => 'Twig_Node_Expression_Binary_Mod', 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'is'     => array('precedence' => 100, 'callable' => array($this, 'parseTestExpression'), 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                'is not' => array('precedence' => 100, 'callable' => array($this, 'parseNotTestExpression'), 'associativity' => Twig_ExpressionParser::OPERATOR_LEFT),
+                '**'     => array('precedence' => 200, 'class' => 'Twig_Node_Expression_Binary_Power', 'associativity' => Twig_ExpressionParser::OPERATOR_RIGHT),
+            ),
+        );
+    }
+
+    public function parseNotTestExpression(Twig_Parser $parser, $node)
+    {
+        return new Twig_Node_Expression_Unary_Not($this->parseTestExpression($parser, $node), $parser->getCurrentToken()->getLine());
+    }
+
+    public function parseTestExpression(Twig_Parser $parser, $node)
+    {
+        $stream = $parser->getStream();
+        $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+        $arguments = null;
+        if ($stream->test(Twig_Token::PUNCTUATION_TYPE, '(')) {
+            $arguments = $parser->getExpressionParser()->parseArguments(true);
+        }
+
+        $class = $this->getTestNodeClass($parser, $name, $node->getLine());
+
+        return new $class($node, $name, $arguments, $parser->getCurrentToken()->getLine());
+    }
+
+    protected function getTestNodeClass(Twig_Parser $parser, $name, $line)
+    {
+        $env = $parser->getEnvironment();
+        $testMap = $env->getTests();
+        if (!isset($testMap[$name])) {
+            $message = sprintf('The test "%s" does not exist', $name);
+            if ($alternatives = $env->computeAlternatives($name, array_keys($env->getTests()))) {
+                $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
+            }
+
+            throw new Twig_Error_Syntax($message, $line, $parser->getFilename());
+        }
+
+        if ($testMap[$name] instanceof Twig_SimpleTest) {
+            return $testMap[$name]->getNodeClass();
+        }
+
+        return $testMap[$name] instanceof Twig_Test_Node ? $testMap[$name]->getClass() : 'Twig_Node_Expression_Test';
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'core';
+    }
+}
+
+/**
+ * Cycles over a value.
+ *
+ * @param ArrayAccess|array $values   An array or an ArrayAccess instance
+ * @param integer           $position The cycle position
+ *
+ * @return string The next value in the cycle
+ */
+function twig_cycle($values, $position)
+{
+    if (!is_array($values) && !$values instanceof ArrayAccess) {
+        return $values;
+    }
+
+    return $values[$position % count($values)];
+}
+
+/**
+ * Returns a random value depending on the supplied parameter type:
+ * - a random item from a Traversable or array
+ * - a random character from a string
+ * - a random integer between 0 and the integer parameter
+ *
+ * @param Twig_Environment                 $env    A Twig_Environment instance
+ * @param Traversable|array|integer|string $values The values to pick a random item from
+ *
+ * @throws Twig_Error_Runtime When $values is an empty array (does not apply to an empty string which is returned as is).
+ *
+ * @return mixed A random value from the given sequence
+ */
+function twig_random(Twig_Environment $env, $values = null)
+{
+    if (null === $values) {
+        return mt_rand();
+    }
+
+    if (is_int($values) || is_float($values)) {
+        return $values < 0 ? mt_rand($values, 0) : mt_rand(0, $values);
+    }
+
+    if ($values instanceof Traversable) {
+        $values = iterator_to_array($values);
+    } elseif (is_string($values)) {
+        if ('' === $values) {
+            return '';
+        }
+        if (null !== $charset = $env->getCharset()) {
+            if ('UTF-8' != $charset) {
+                $values = twig_convert_encoding($values, 'UTF-8', $charset);
+            }
+
+            // unicode version of str_split()
+            // split at all positions, but not after the start and not before the end
+            $values = preg_split('/(?<!^)(?!$)/u', $values);
+
+            if ('UTF-8' != $charset) {
+                foreach ($values as $i => $value) {
+                    $values[$i] = twig_convert_encoding($value, $charset, 'UTF-8');
+                }
+            }
+        } else {
+            return $values[mt_rand(0, strlen($values) - 1)];
+        }
+    }
+
+    if (!is_array($values)) {
+        return $values;
+    }
+
+    if (0 === count($values)) {
+        throw new Twig_Error_Runtime('The random function cannot pick from an empty array.');
+    }
+
+    return $values[array_rand($values, 1)];
+}
+
+/**
+ * Converts a date to the given format.
+ *
+ * <pre>
+ *   {{ post.published_at|date("m/d/Y") }}
+ * </pre>
+ *
+ * @param Twig_Environment             $env      A Twig_Environment instance
+ * @param DateTime|DateInterval|string $date     A date
+ * @param string                       $format   A format
+ * @param DateTimeZone|string          $timezone A timezone
+ *
+ * @return string The formatted date
+ */
+function twig_date_format_filter(Twig_Environment $env, $date, $format = null, $timezone = null)
+{
+    if (null === $format) {
+        $formats = $env->getExtension('core')->getDateFormat();
+        $format = $date instanceof DateInterval ? $formats[1] : $formats[0];
+    }
+
+    if ($date instanceof DateInterval) {
+        return $date->format($format);
+    }
+
+    return twig_date_converter($env, $date, $timezone)->format($format);
+}
+
+/**
+ * Returns a new date object modified
+ *
+ * <pre>
+ *   {{ post.published_at|date_modify("-1day")|date("m/d/Y") }}
+ * </pre>
+ *
+ * @param Twig_Environment  $env      A Twig_Environment instance
+ * @param DateTime|string   $date     A date
+ * @param string            $modifier A modifier string
+ *
+ * @return DateTime A new date object
+ */
+function twig_date_modify_filter(Twig_Environment $env, $date, $modifier)
+{
+    $date = twig_date_converter($env, $date, false);
+    $date->modify($modifier);
+
+    return $date;
+}
+
+/**
+ * Converts an input to a DateTime instance.
+ *
+ * <pre>
+ *    {% if date(user.created_at) < date('+2days') %}
+ *      {# do something #}
+ *    {% endif %}
+ * </pre>
+ *
+ * @param Twig_Environment    $env      A Twig_Environment instance
+ * @param DateTime|string     $date     A date
+ * @param DateTimeZone|string $timezone A timezone
+ *
+ * @return DateTime A DateTime instance
+ */
+function twig_date_converter(Twig_Environment $env, $date = null, $timezone = null)
+{
+    // determine the timezone
+    if (!$timezone) {
+        $defaultTimezone = $env->getExtension('core')->getTimezone();
+    } elseif (!$timezone instanceof DateTimeZone) {
+        $defaultTimezone = new DateTimeZone($timezone);
+    } else {
+        $defaultTimezone = $timezone;
+    }
+
+    if ($date instanceof DateTime) {
+        $date = clone $date;
+        if (false !== $timezone) {
+            $date->setTimezone($defaultTimezone);
+        }
+
+        return $date;
+    }
+
+    $asString = (string) $date;
+    if (ctype_digit($asString) || (!empty($asString) && '-' === $asString[0] && ctype_digit(substr($asString, 1)))) {
+        $date = '@'.$date;
+    }
+
+    $date = new DateTime($date, $defaultTimezone);
+    if (false !== $timezone) {
+        $date->setTimezone($defaultTimezone);
+    }
+
+    return $date;
+}
+
+/**
+ * Number format filter.
+ *
+ * All of the formatting options can be left null, in that case the defaults will
+ * be used.  Supplying any of the parameters will override the defaults set in the
+ * environment object.
+ *
+ * @param Twig_Environment    $env          A Twig_Environment instance
+ * @param mixed               $number       A float/int/string of the number to format
+ * @param integer             $decimal      The number of decimal points to display.
+ * @param string              $decimalPoint The character(s) to use for the decimal point.
+ * @param string              $thousandSep  The character(s) to use for the thousands separator.
+ *
+ * @return string The formatted number
+ */
+function twig_number_format_filter(Twig_Environment $env, $number, $decimal = null, $decimalPoint = null, $thousandSep = null)
+{
+    $defaults = $env->getExtension('core')->getNumberFormat();
+    if (null === $decimal) {
+        $decimal = $defaults[0];
+    }
+
+    if (null === $decimalPoint) {
+        $decimalPoint = $defaults[1];
+    }
+
+    if (null === $thousandSep) {
+        $thousandSep = $defaults[2];
+    }
+
+    return number_format((float) $number, $decimal, $decimalPoint, $thousandSep);
+}
+
+/**
+ * URL encodes a string as a path segment or an array as a query string.
+ *
+ * @param string|array $url A URL or an array of query parameters
+ * @param bool         $raw true to use rawurlencode() instead of urlencode
+ *
+ * @return string The URL encoded value
+ */
+function twig_urlencode_filter($url, $raw = false)
+{
+    if (is_array($url)) {
+        return http_build_query($url, '', '&');
+    }
+
+    if ($raw) {
+        return rawurlencode($url);
+    }
+
+    return urlencode($url);
+}
+
+if (version_compare(PHP_VERSION, '5.3.0', '<')) {
+    /**
+     * JSON encodes a variable.
+     *
+     * @param mixed   $value   The value to encode.
+     * @param integer $options Not used on PHP 5.2.x
+     *
+     * @return mixed The JSON encoded value
+     */
+    function twig_jsonencode_filter($value, $options = 0)
+    {
+        if ($value instanceof Twig_Markup) {
+            $value = (string) $value;
+        } elseif (is_array($value)) {
+            array_walk_recursive($value, '_twig_markup2string');
+        }
+
+        return json_encode($value);
+    }
+} else {
+    /**
+     * JSON encodes a variable.
+     *
+     * @param mixed   $value   The value to encode.
+     * @param integer $options Bitmask consisting of JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT
+     *
+     * @return mixed The JSON encoded value
+     */
+    function twig_jsonencode_filter($value, $options = 0)
+    {
+        if ($value instanceof Twig_Markup) {
+            $value = (string) $value;
+        } elseif (is_array($value)) {
+            array_walk_recursive($value, '_twig_markup2string');
+        }
+
+        return json_encode($value, $options);
+    }
+}
+
+function _twig_markup2string(&$value)
+{
+    if ($value instanceof Twig_Markup) {
+        $value = (string) $value;
+    }
+}
+
+/**
+ * Merges an array with another one.
+ *
+ * <pre>
+ *  {% set items = { 'apple': 'fruit', 'orange': 'fruit' } %}
+ *
+ *  {% set items = items|merge({ 'peugeot': 'car' }) %}
+ *
+ *  {# items now contains { 'apple': 'fruit', 'orange': 'fruit', 'peugeot': 'car' } #}
+ * </pre>
+ *
+ * @param array $arr1 An array
+ * @param array $arr2 An array
+ *
+ * @return array The merged array
+ */
+function twig_array_merge($arr1, $arr2)
+{
+    if (!is_array($arr1) || !is_array($arr2)) {
+        throw new Twig_Error_Runtime('The merge filter only works with arrays or hashes.');
+    }
+
+    return array_merge($arr1, $arr2);
+}
+
+/**
+ * Slices a variable.
+ *
+ * @param Twig_Environment $env          A Twig_Environment instance
+ * @param mixed            $item         A variable
+ * @param integer          $start        Start of the slice
+ * @param integer          $length       Size of the slice
+ * @param Boolean          $preserveKeys Whether to preserve key or not (when the input is an array)
+ *
+ * @return mixed The sliced variable
+ */
+function twig_slice(Twig_Environment $env, $item, $start, $length = null, $preserveKeys = false)
+{
+    if ($item instanceof Traversable) {
+        $item = iterator_to_array($item, false);
+    }
+
+    if (is_array($item)) {
+        return array_slice($item, $start, $length, $preserveKeys);
+    }
+
+    $item = (string) $item;
+
+    if (function_exists('mb_get_info') && null !== $charset = $env->getCharset()) {
+        return mb_substr($item, $start, null === $length ? mb_strlen($item, $charset) - $start : $length, $charset);
+    }
+
+    return null === $length ? substr($item, $start) : substr($item, $start, $length);
+}
+
+/**
+ * Returns the first element of the item.
+ *
+ * @param Twig_Environment $env  A Twig_Environment instance
+ * @param mixed            $item A variable
+ *
+ * @return mixed The first element of the item
+ */
+function twig_first(Twig_Environment $env, $item)
+{
+    $elements = twig_slice($env, $item, 0, 1, false);
+
+    return is_string($elements) ? $elements[0] : current($elements);
+}
+
+/**
+ * Returns the last element of the item.
+ *
+ * @param Twig_Environment $env  A Twig_Environment instance
+ * @param mixed            $item A variable
+ *
+ * @return mixed The last element of the item
+ */
+function twig_last(Twig_Environment $env, $item)
+{
+    $elements = twig_slice($env, $item, -1, 1, false);
+
+    return is_string($elements) ? $elements[0] : current($elements);
+}
+
+/**
+ * Joins the values to a string.
+ *
+ * The separator between elements is an empty string per default, you can define it with the optional parameter.
+ *
+ * <pre>
+ *  {{ [1, 2, 3]|join('|') }}
+ *  {# returns 1|2|3 #}
+ *
+ *  {{ [1, 2, 3]|join }}
+ *  {# returns 123 #}
+ * </pre>
+ *
+ * @param array  $value An array
+ * @param string $glue  The separator
+ *
+ * @return string The concatenated string
+ */
+function twig_join_filter($value, $glue = '')
+{
+    if ($value instanceof Traversable) {
+        $value = iterator_to_array($value, false);
+    }
+
+    return implode($glue, (array) $value);
+}
+
+/**
+ * Splits the string into an array.
+ *
+ * <pre>
+ *  {{ "one,two,three"|split(',') }}
+ *  {# returns [one, two, three] #}
+ *
+ *  {{ "one,two,three,four,five"|split(',', 3) }}
+ *  {# returns [one, two, "three,four,five"] #}
+ *
+ *  {{ "123"|split('') }}
+ *  {# returns [1, 2, 3] #}
+ *
+ *  {{ "aabbcc"|split('', 2) }}
+ *  {# returns [aa, bb, cc] #}
+ * </pre>
+ *
+ * @param string  $value     A string
+ * @param string  $delimiter The delimiter
+ * @param integer $limit     The limit
+ *
+ * @return array The split string as an array
+ */
+function twig_split_filter($value, $delimiter, $limit = null)
+{
+    if (empty($delimiter)) {
+        return str_split($value, null === $limit ? 1 : $limit);
+    }
+
+    return null === $limit ? explode($delimiter, $value) : explode($delimiter, $value, $limit);
+}
+
+// The '_default' filter is used internally to avoid using the ternary operator
+// which costs a lot for big contexts (before PHP 5.4). So, on average,
+// a function call is cheaper.
+function _twig_default_filter($value, $default = '')
+{
+    if (twig_test_empty($value)) {
+        return $default;
+    }
+
+    return $value;
+}
+
+/**
+ * Returns the keys for the given array.
+ *
+ * It is useful when you want to iterate over the keys of an array:
+ *
+ * <pre>
+ *  {% for key in array|keys %}
+ *      {# ... #}
+ *  {% endfor %}
+ * </pre>
+ *
+ * @param array $array An array
+ *
+ * @return array The keys
+ */
+function twig_get_array_keys_filter($array)
+{
+    if (is_object($array) && $array instanceof Traversable) {
+        return array_keys(iterator_to_array($array));
+    }
+
+    if (!is_array($array)) {
+        return array();
+    }
+
+    return array_keys($array);
+}
+
+/**
+ * Reverses a variable.
+ *
+ * @param Twig_Environment         $env          A Twig_Environment instance
+ * @param array|Traversable|string $item         An array, a Traversable instance, or a string
+ * @param Boolean                  $preserveKeys Whether to preserve key or not
+ *
+ * @return mixed The reversed input
+ */
+function twig_reverse_filter(Twig_Environment $env, $item, $preserveKeys = false)
+{
+    if (is_object($item) && $item instanceof Traversable) {
+        return array_reverse(iterator_to_array($item), $preserveKeys);
+    }
+
+    if (is_array($item)) {
+        return array_reverse($item, $preserveKeys);
+    }
+
+    if (null !== $charset = $env->getCharset()) {
+        $string = (string) $item;
+
+        if ('UTF-8' != $charset) {
+            $item = twig_convert_encoding($string, 'UTF-8', $charset);
+        }
+
+        preg_match_all('/./us', $item, $matches);
+
+        $string = implode('', array_reverse($matches[0]));
+
+        if ('UTF-8' != $charset) {
+            $string = twig_convert_encoding($string, $charset, 'UTF-8');
+        }
+
+        return $string;
+    }
+
+    return strrev((string) $item);
+}
+
+/**
+ * Sorts an array.
+ *
+ * @param array $array An array
+ */
+function twig_sort_filter($array)
+{
+    asort($array);
+
+    return $array;
+}
+
+/* used internally */
+function twig_in_filter($value, $compare)
+{
+    if (is_array($compare)) {
+        return in_array($value, $compare, is_object($value));
+    } elseif (is_string($compare)) {
+        if (!strlen($value)) {
+            return empty($compare);
+        }
+
+        return false !== strpos($compare, (string) $value);
+    } elseif ($compare instanceof Traversable) {
+        return in_array($value, iterator_to_array($compare, false), is_object($value));
+    }
+
+    return false;
+}
+
+/**
+ * Escapes a string.
+ *
+ * @param Twig_Environment $env        A Twig_Environment instance
+ * @param string           $string     The value to be escaped
+ * @param string           $strategy   The escaping strategy
+ * @param string           $charset    The charset
+ * @param Boolean          $autoescape Whether the function is called by the auto-escaping feature (true) or by the developer (false)
+ */
+function twig_escape_filter(Twig_Environment $env, $string, $strategy = 'html', $charset = null, $autoescape = false)
+{
+    if ($autoescape && $string instanceof Twig_Markup) {
+        return $string;
+    }
+
+    if (!is_string($string)) {
+        if (is_object($string) && method_exists($string, '__toString')) {
+            $string = (string) $string;
+        } else {
+            return $string;
+        }
+    }
+
+    if (null === $charset) {
+        $charset = $env->getCharset();
+    }
+
+    switch ($strategy) {
+        case 'html':
+            // see http://php.net/htmlspecialchars
+
+            // Using a static variable to avoid initializing the array
+            // each time the function is called. Moving the declaration on the
+            // top of the function slow downs other escaping strategies.
+            static $htmlspecialcharsCharsets = array(
+                'ISO-8859-1' => true, 'ISO8859-1' => true,
+                'ISO-8859-15' => true, 'ISO8859-15' => true,
+                'utf-8' => true, 'UTF-8' => true,
+                'CP866' => true, 'IBM866' => true, '866' => true,
+                'CP1251' => true, 'WINDOWS-1251' => true, 'WIN-1251' => true,
+                '1251' => true,
+                'CP1252' => true, 'WINDOWS-1252' => true, '1252' => true,
+                'KOI8-R' => true, 'KOI8-RU' => true, 'KOI8R' => true,
+                'BIG5' => true, '950' => true,
+                'GB2312' => true, '936' => true,
+                'BIG5-HKSCS' => true,
+                'SHIFT_JIS' => true, 'SJIS' => true, '932' => true,
+                'EUC-JP' => true, 'EUCJP' => true,
+                'ISO8859-5' => true, 'ISO-8859-5' => true, 'MACROMAN' => true,
+            );
+
+            if (isset($htmlspecialcharsCharsets[$charset])) {
+                return htmlspecialchars($string, ENT_QUOTES | ENT_SUBSTITUTE, $charset);
+            }
+
+            if (isset($htmlspecialcharsCharsets[strtoupper($charset)])) {
+                // cache the lowercase variant for future iterations
+                $htmlspecialcharsCharsets[$charset] = true;
+
+                return htmlspecialchars($string, ENT_QUOTES | ENT_SUBSTITUTE, $charset);
+            }
+
+            $string = twig_convert_encoding($string, 'UTF-8', $charset);
+            $string = htmlspecialchars($string, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
+
+            return twig_convert_encoding($string, $charset, 'UTF-8');
+
+        case 'js':
+            // escape all non-alphanumeric characters
+            // into their \xHH or \uHHHH representations
+            if ('UTF-8' != $charset) {
+                $string = twig_convert_encoding($string, 'UTF-8', $charset);
+            }
+
+            if (0 == strlen($string) ? false : (1 == preg_match('/^./su', $string) ? false : true)) {
+                throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
+            }
+
+            $string = preg_replace_callback('#[^a-zA-Z0-9,\._]#Su', '_twig_escape_js_callback', $string);
+
+            if ('UTF-8' != $charset) {
+                $string = twig_convert_encoding($string, $charset, 'UTF-8');
+            }
+
+            return $string;
+
+        case 'css':
+            if ('UTF-8' != $charset) {
+                $string = twig_convert_encoding($string, 'UTF-8', $charset);
+            }
+
+            if (0 == strlen($string) ? false : (1 == preg_match('/^./su', $string) ? false : true)) {
+                throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
+            }
+
+            $string = preg_replace_callback('#[^a-zA-Z0-9]#Su', '_twig_escape_css_callback', $string);
+
+            if ('UTF-8' != $charset) {
+                $string = twig_convert_encoding($string, $charset, 'UTF-8');
+            }
+
+            return $string;
+
+        case 'html_attr':
+            if ('UTF-8' != $charset) {
+                $string = twig_convert_encoding($string, 'UTF-8', $charset);
+            }
+
+            if (0 == strlen($string) ? false : (1 == preg_match('/^./su', $string) ? false : true)) {
+                throw new Twig_Error_Runtime('The string to escape is not a valid UTF-8 string.');
+            }
+
+            $string = preg_replace_callback('#[^a-zA-Z0-9,\.\-_]#Su', '_twig_escape_html_attr_callback', $string);
+
+            if ('UTF-8' != $charset) {
+                $string = twig_convert_encoding($string, $charset, 'UTF-8');
+            }
+
+            return $string;
+
+        case 'url':
+            // hackish test to avoid version_compare that is much slower, this works unless PHP releases a 5.10.*
+            // at that point however PHP 5.2.* support can be removed
+            if (PHP_VERSION < '5.3.0') {
+                return str_replace('%7E', '~', rawurlencode($string));
+            }
+
+            return rawurlencode($string);
+
+        default:
+            throw new Twig_Error_Runtime(sprintf('Invalid escaping strategy "%s" (valid ones: html, js, url, css, and html_attr).', $strategy));
+    }
+}
+
+/* used internally */
+function twig_escape_filter_is_safe(Twig_Node $filterArgs)
+{
+    foreach ($filterArgs as $arg) {
+        if ($arg instanceof Twig_Node_Expression_Constant) {
+            return array($arg->getAttribute('value'));
+        }
+
+        return array();
+    }
+
+    return array('html');
+}
+
+if (function_exists('mb_convert_encoding')) {
+    function twig_convert_encoding($string, $to, $from)
+    {
+        return mb_convert_encoding($string, $to, $from);
+    }
+} elseif (function_exists('iconv')) {
+    function twig_convert_encoding($string, $to, $from)
+    {
+        return iconv($from, $to, $string);
+    }
+} else {
+    function twig_convert_encoding($string, $to, $from)
+    {
+        throw new Twig_Error_Runtime('No suitable convert encoding function (use UTF-8 as your encoding or install the iconv or mbstring extension).');
+    }
+}
+
+function _twig_escape_js_callback($matches)
+{
+    $char = $matches[0];
+
+    // \xHH
+    if (!isset($char[1])) {
+        return '\\x'.strtoupper(substr('00'.bin2hex($char), -2));
+    }
+
+    // \uHHHH
+    $char = twig_convert_encoding($char, 'UTF-16BE', 'UTF-8');
+
+    return '\\u'.strtoupper(substr('0000'.bin2hex($char), -4));
+}
+
+function _twig_escape_css_callback($matches)
+{
+    $char = $matches[0];
+
+    // \xHH
+    if (!isset($char[1])) {
+        $hex = ltrim(strtoupper(bin2hex($char)), '0');
+        if (0 === strlen($hex)) {
+            $hex = '0';
+        }
+
+        return '\\'.$hex.' ';
+    }
+
+    // \uHHHH
+    $char = twig_convert_encoding($char, 'UTF-16BE', 'UTF-8');
+
+    return '\\'.ltrim(strtoupper(bin2hex($char)), '0').' ';
+}
+
+/**
+ * This function is adapted from code coming from Zend Framework.
+ *
+ * @copyright Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license   http://framework.zend.com/license/new-bsd New BSD License
+ */
+function _twig_escape_html_attr_callback($matches)
+{
+    /*
+     * While HTML supports far more named entities, the lowest common denominator
+     * has become HTML5's XML Serialisation which is restricted to the those named
+     * entities that XML supports. Using HTML entities would result in this error:
+     *     XML Parsing Error: undefined entity
+     */
+    static $entityMap = array(
+        34 => 'quot', /* quotation mark */
+        38 => 'amp',  /* ampersand */
+        60 => 'lt',   /* less-than sign */
+        62 => 'gt',   /* greater-than sign */
+    );
+
+    $chr = $matches[0];
+    $ord = ord($chr);
+
+    /**
+     * The following replaces characters undefined in HTML with the
+     * hex entity for the Unicode replacement character.
+     */
+    if (($ord <= 0x1f && $chr != "\t" && $chr != "\n" && $chr != "\r") || ($ord >= 0x7f && $ord <= 0x9f)) {
+        return '&#xFFFD;';
+    }
+
+    /**
+     * Check if the current character to escape has a name entity we should
+     * replace it with while grabbing the hex value of the character.
+     */
+    if (strlen($chr) == 1) {
+        $hex = strtoupper(substr('00'.bin2hex($chr), -2));
+    } else {
+        $chr = twig_convert_encoding($chr, 'UTF-16BE', 'UTF-8');
+        $hex = strtoupper(substr('0000'.bin2hex($chr), -4));
+    }
+
+    $int = hexdec($hex);
+    if (array_key_exists($int, $entityMap)) {
+        return sprintf('&%s;', $entityMap[$int]);
+    }
+
+    /**
+     * Per OWASP recommendations, we'll use hex entities for any other
+     * characters where a named entity does not exist.
+     */
+
+    return sprintf('&#x%s;', $hex);
+}
+
+// add multibyte extensions if possible
+if (function_exists('mb_get_info')) {
+    /**
+     * Returns the length of a variable.
+     *
+     * @param Twig_Environment $env   A Twig_Environment instance
+     * @param mixed            $thing A variable
+     *
+     * @return integer The length of the value
+     */
+    function twig_length_filter(Twig_Environment $env, $thing)
+    {
+        return is_scalar($thing) ? mb_strlen($thing, $env->getCharset()) : count($thing);
+    }
+
+    /**
+     * Converts a string to uppercase.
+     *
+     * @param Twig_Environment $env    A Twig_Environment instance
+     * @param string           $string A string
+     *
+     * @return string The uppercased string
+     */
+    function twig_upper_filter(Twig_Environment $env, $string)
+    {
+        if (null !== ($charset = $env->getCharset())) {
+            return mb_strtoupper($string, $charset);
+        }
+
+        return strtoupper($string);
+    }
+
+    /**
+     * Converts a string to lowercase.
+     *
+     * @param Twig_Environment $env    A Twig_Environment instance
+     * @param string           $string A string
+     *
+     * @return string The lowercased string
+     */
+    function twig_lower_filter(Twig_Environment $env, $string)
+    {
+        if (null !== ($charset = $env->getCharset())) {
+            return mb_strtolower($string, $charset);
+        }
+
+        return strtolower($string);
+    }
+
+    /**
+     * Returns a titlecased string.
+     *
+     * @param Twig_Environment $env    A Twig_Environment instance
+     * @param string           $string A string
+     *
+     * @return string The titlecased string
+     */
+    function twig_title_string_filter(Twig_Environment $env, $string)
+    {
+        if (null !== ($charset = $env->getCharset())) {
+            return mb_convert_case($string, MB_CASE_TITLE, $charset);
+        }
+
+        return ucwords(strtolower($string));
+    }
+
+    /**
+     * Returns a capitalized string.
+     *
+     * @param Twig_Environment $env    A Twig_Environment instance
+     * @param string           $string A string
+     *
+     * @return string The capitalized string
+     */
+    function twig_capitalize_string_filter(Twig_Environment $env, $string)
+    {
+        if (null !== ($charset = $env->getCharset())) {
+            return mb_strtoupper(mb_substr($string, 0, 1, $charset), $charset).
+                         mb_strtolower(mb_substr($string, 1, mb_strlen($string, $charset), $charset), $charset);
+        }
+
+        return ucfirst(strtolower($string));
+    }
+}
+// and byte fallback
+else {
+    /**
+     * Returns the length of a variable.
+     *
+     * @param Twig_Environment $env   A Twig_Environment instance
+     * @param mixed            $thing A variable
+     *
+     * @return integer The length of the value
+     */
+    function twig_length_filter(Twig_Environment $env, $thing)
+    {
+        return is_scalar($thing) ? strlen($thing) : count($thing);
+    }
+
+    /**
+     * Returns a titlecased string.
+     *
+     * @param Twig_Environment $env    A Twig_Environment instance
+     * @param string           $string A string
+     *
+     * @return string The titlecased string
+     */
+    function twig_title_string_filter(Twig_Environment $env, $string)
+    {
+        return ucwords(strtolower($string));
+    }
+
+    /**
+     * Returns a capitalized string.
+     *
+     * @param Twig_Environment $env    A Twig_Environment instance
+     * @param string           $string A string
+     *
+     * @return string The capitalized string
+     */
+    function twig_capitalize_string_filter(Twig_Environment $env, $string)
+    {
+        return ucfirst(strtolower($string));
+    }
+}
+
+/* used internally */
+function twig_ensure_traversable($seq)
+{
+    if ($seq instanceof Traversable || is_array($seq)) {
+        return $seq;
+    }
+
+    return array();
+}
+
+/**
+ * Checks if a variable is empty.
+ *
+ * <pre>
+ * {# evaluates to true if the foo variable is null, false, or the empty string #}
+ * {% if foo is empty %}
+ *     {# ... #}
+ * {% endif %}
+ * </pre>
+ *
+ * @param mixed $value A variable
+ *
+ * @return Boolean true if the value is empty, false otherwise
+ */
+function twig_test_empty($value)
+{
+    if ($value instanceof Countable) {
+        return 0 == count($value);
+    }
+
+    return '' === $value || false === $value || null === $value || array() === $value;
+}
+
+/**
+ * Checks if a variable is traversable.
+ *
+ * <pre>
+ * {# evaluates to true if the foo variable is an array or a traversable object #}
+ * {% if foo is traversable %}
+ *     {# ... #}
+ * {% endif %}
+ * </pre>
+ *
+ * @param mixed $value A variable
+ *
+ * @return Boolean true if the value is traversable
+ */
+function twig_test_iterable($value)
+{
+    return $value instanceof Traversable || is_array($value);
+}
+
+/**
+ * Renders a template.
+ *
+ * @param string  $template       The template to render
+ * @param array   $variables      The variables to pass to the template
+ * @param Boolean $with_context   Whether to pass the current context variables or not
+ * @param Boolean $ignore_missing Whether to ignore missing templates or not
+ * @param Boolean $sandboxed      Whether to sandbox the template or not
+ *
+ * @return string The rendered template
+ */
+function twig_include(Twig_Environment $env, $context, $template, $variables = array(), $withContext = true, $ignoreMissing = false, $sandboxed = false)
+{
+    if ($withContext) {
+        $variables = array_merge($context, $variables);
+    }
+
+    if ($isSandboxed = $sandboxed && $env->hasExtension('sandbox')) {
+        $sandbox = $env->getExtension('sandbox');
+        if (!$alreadySandboxed = $sandbox->isSandboxed()) {
+            $sandbox->enableSandbox();
+        }
+    }
+
+    try {
+        return $env->resolveTemplate($template)->render($variables);
+    } catch (Twig_Error_Loader $e) {
+        if (!$ignoreMissing) {
+            throw $e;
+        }
+    }
+
+    if ($isSandboxed && !$alreadySandboxed) {
+        $sandbox->disableSandbox();
+    }
+}
+
+/**
+ * Provides the ability to get constants from instances as well as class/global constants.
+ *
+ * @param string      $constant The name of the constant
+ * @param null|object $object   The object to get the constant from
+ *
+ * @return string
+ */
+function twig_constant($constant, $object = null)
+{
+    if (null !== $object) {
+        $constant = get_class($object).'::'.$constant;
+    }
+
+    return constant($constant);
+}
+
+/**
+ * Batches item.
+ *
+ * @param array   $items An array of items
+ * @param integer $size  The size of the batch
+ * @param string  $fill  A string to fill missing items
+ *
+ * @return array
+ */
+function twig_array_batch($items, $size, $fill = null)
+{
+    if ($items instanceof Traversable) {
+        $items = iterator_to_array($items, false);
+    }
+
+    $size = ceil($size);
+
+    $result = array_chunk($items, $size, true);
+
+    if (null !== $fill) {
+        $last = count($result) - 1;
+        $result[$last] = array_merge(
+            $result[$last],
+            array_fill(0, $size - count($result[$last]), $fill)
+        );
+    }
+
+    return $result;
+}
diff --git a/inc/Twig/Extension/Debug.php b/inc/Twig/Extension/Debug.php
new file mode 100644
index 00000000..e3a85bfe
--- /dev/null
+++ b/inc/Twig/Extension/Debug.php
@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Debug extends Twig_Extension
+{
+    /**
+     * Returns a list of global functions to add to the existing list.
+     *
+     * @return array An array of global functions
+     */
+    public function getFunctions()
+    {
+        // dump is safe if var_dump is overridden by xdebug
+        $isDumpOutputHtmlSafe = extension_loaded('xdebug')
+            // false means that it was not set (and the default is on) or it explicitly enabled
+            && (false === ini_get('xdebug.overload_var_dump') || ini_get('xdebug.overload_var_dump'))
+            // false means that it was not set (and the default is on) or it explicitly enabled
+            // xdebug.overload_var_dump produces HTML only when html_errors is also enabled
+            && (false === ini_get('html_errors') || ini_get('html_errors'))
+            || 'cli' === php_sapi_name()
+        ;
+
+        return array(
+            new Twig_SimpleFunction('dump', 'twig_var_dump', array('is_safe' => $isDumpOutputHtmlSafe ? array('html') : array(), 'needs_context' => true, 'needs_environment' => true)),
+        );
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'debug';
+    }
+}
+
+function twig_var_dump(Twig_Environment $env, $context)
+{
+    if (!$env->isDebug()) {
+        return;
+    }
+
+    ob_start();
+
+    $count = func_num_args();
+    if (2 === $count) {
+        $vars = array();
+        foreach ($context as $key => $value) {
+            if (!$value instanceof Twig_Template) {
+                $vars[$key] = $value;
+            }
+        }
+
+        var_dump($vars);
+    } else {
+        for ($i = 2; $i < $count; $i++) {
+            var_dump(func_get_arg($i));
+        }
+    }
+
+    return ob_get_clean();
+}
diff --git a/inc/Twig/Extension/Escaper.php b/inc/Twig/Extension/Escaper.php
new file mode 100644
index 00000000..c9a7f68e
--- /dev/null
+++ b/inc/Twig/Extension/Escaper.php
@@ -0,0 +1,107 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Escaper extends Twig_Extension
+{
+    protected $defaultStrategy;
+
+    public function __construct($defaultStrategy = 'html')
+    {
+        $this->setDefaultStrategy($defaultStrategy);
+    }
+
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers()
+    {
+        return array(new Twig_TokenParser_AutoEscape());
+    }
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return array An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Escaper());
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters()
+    {
+        return array(
+            new Twig_SimpleFilter('raw', 'twig_raw_filter', array('is_safe' => array('all'))),
+        );
+    }
+
+    /**
+     * Sets the default strategy to use when not defined by the user.
+     *
+     * The strategy can be a valid PHP callback that takes the template
+     * "filename" as an argument and returns the strategy to use.
+     *
+     * @param mixed $defaultStrategy An escaping strategy
+     */
+    public function setDefaultStrategy($defaultStrategy)
+    {
+        // for BC
+        if (true === $defaultStrategy) {
+            $defaultStrategy = 'html';
+        }
+
+        $this->defaultStrategy = $defaultStrategy;
+    }
+
+    /**
+     * Gets the default strategy to use when not defined by the user.
+     *
+     * @param string $filename The template "filename"
+     *
+     * @return string The default strategy to use for the template
+     */
+    public function getDefaultStrategy($filename)
+    {
+        // disable string callables to avoid calling a function named html or js,
+        // or any other upcoming escaping strategy
+        if (!is_string($this->defaultStrategy) && is_callable($this->defaultStrategy)) {
+            return call_user_func($this->defaultStrategy, $filename);
+        }
+
+        return $this->defaultStrategy;
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'escaper';
+    }
+}
+
+/**
+ * Marks a variable as being safe.
+ *
+ * @param string $string A PHP variable
+ */
+function twig_raw_filter($string)
+{
+    return $string;
+}
diff --git a/inc/Twig/Extension/Optimizer.php b/inc/Twig/Extension/Optimizer.php
new file mode 100644
index 00000000..013fcb62
--- /dev/null
+++ b/inc/Twig/Extension/Optimizer.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Optimizer extends Twig_Extension
+{
+    protected $optimizers;
+
+    public function __construct($optimizers = -1)
+    {
+        $this->optimizers = $optimizers;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Optimizer($this->optimizers));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'optimizer';
+    }
+}
diff --git a/inc/Twig/Extension/Sandbox.php b/inc/Twig/Extension/Sandbox.php
new file mode 100644
index 00000000..bf76c11a
--- /dev/null
+++ b/inc/Twig/Extension/Sandbox.php
@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Sandbox extends Twig_Extension
+{
+    protected $sandboxedGlobally;
+    protected $sandboxed;
+    protected $policy;
+
+    public function __construct(Twig_Sandbox_SecurityPolicyInterface $policy, $sandboxed = false)
+    {
+        $this->policy            = $policy;
+        $this->sandboxedGlobally = $sandboxed;
+    }
+
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers()
+    {
+        return array(new Twig_TokenParser_Sandbox());
+    }
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return array An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Sandbox());
+    }
+
+    public function enableSandbox()
+    {
+        $this->sandboxed = true;
+    }
+
+    public function disableSandbox()
+    {
+        $this->sandboxed = false;
+    }
+
+    public function isSandboxed()
+    {
+        return $this->sandboxedGlobally || $this->sandboxed;
+    }
+
+    public function isSandboxedGlobally()
+    {
+        return $this->sandboxedGlobally;
+    }
+
+    public function setSecurityPolicy(Twig_Sandbox_SecurityPolicyInterface $policy)
+    {
+        $this->policy = $policy;
+    }
+
+    public function getSecurityPolicy()
+    {
+        return $this->policy;
+    }
+
+    public function checkSecurity($tags, $filters, $functions)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkSecurity($tags, $filters, $functions);
+        }
+    }
+
+    public function checkMethodAllowed($obj, $method)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkMethodAllowed($obj, $method);
+        }
+    }
+
+    public function checkPropertyAllowed($obj, $method)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkPropertyAllowed($obj, $method);
+        }
+    }
+
+    public function ensureToStringAllowed($obj)
+    {
+        if (is_object($obj)) {
+            $this->policy->checkMethodAllowed($obj, '__toString');
+        }
+
+        return $obj;
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'sandbox';
+    }
+}
diff --git a/inc/Twig/Extension/Staging.php b/inc/Twig/Extension/Staging.php
new file mode 100644
index 00000000..8ab0f459
--- /dev/null
+++ b/inc/Twig/Extension/Staging.php
@@ -0,0 +1,113 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Internal class.
+ *
+ * This class is used by Twig_Environment as a staging area and must not be used directly.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Extension_Staging extends Twig_Extension
+{
+    protected $functions = array();
+    protected $filters = array();
+    protected $visitors = array();
+    protected $tokenParsers = array();
+    protected $globals = array();
+    protected $tests = array();
+
+    public function addFunction($name, $function)
+    {
+        $this->functions[$name] = $function;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFunctions()
+    {
+        return $this->functions;
+    }
+
+    public function addFilter($name, $filter)
+    {
+        $this->filters[$name] = $filter;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getFilters()
+    {
+        return $this->filters;
+    }
+
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        $this->visitors[] = $visitor;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getNodeVisitors()
+    {
+        return $this->visitors;
+    }
+
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        $this->tokenParsers[] = $parser;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTokenParsers()
+    {
+        return $this->tokenParsers;
+    }
+
+    public function addGlobal($name, $value)
+    {
+        $this->globals[$name] = $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getGlobals()
+    {
+        return $this->globals;
+    }
+
+    public function addTest($name, $test)
+    {
+        $this->tests[$name] = $test;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getTests()
+    {
+        return $this->tests;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'staging';
+    }
+}
diff --git a/inc/Twig/Extension/StringLoader.php b/inc/Twig/Extension/StringLoader.php
new file mode 100644
index 00000000..20f3f994
--- /dev/null
+++ b/inc/Twig/Extension/StringLoader.php
@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_StringLoader extends Twig_Extension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getFunctions()
+    {
+        return array(
+            new Twig_SimpleFunction('template_from_string', 'twig_template_from_string', array('needs_environment' => true)),
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'string_loader';
+    }
+}
+
+/**
+ * Loads a template from a string.
+ *
+ * <pre>
+ * {{ include(template_from_string("Hello {{ name }}")) }}
+ * </pre>
+ *
+ * @param Twig_Environment $env      A Twig_Environment instance
+ * @param string           $template A template as a string
+ *
+ * @return Twig_Template A Twig_Template instance
+ */
+function twig_template_from_string(Twig_Environment $env, $template)
+{
+    static $loader;
+
+    if (null === $loader) {
+        $loader = new Twig_Loader_String();
+    }
+
+    $current = $env->getLoader();
+    $env->setLoader($loader);
+    try {
+        $template = $env->loadTemplate($template);
+    } catch (Exception $e) {
+        $env->setLoader($current);
+
+        throw $e;
+    }
+    $env->setLoader($current);
+
+    return $template;
+}
diff --git a/inc/Twig/ExtensionInterface.php b/inc/Twig/ExtensionInterface.php
new file mode 100644
index 00000000..f189e9d9
--- /dev/null
+++ b/inc/Twig/ExtensionInterface.php
@@ -0,0 +1,83 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by extension classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_ExtensionInterface
+{
+    /**
+     * Initializes the runtime environment.
+     *
+     * This is where you can load some file that contains filter functions for instance.
+     *
+     * @param Twig_Environment $environment The current Twig_Environment instance
+     */
+    public function initRuntime(Twig_Environment $environment);
+
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers();
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return array An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors();
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters();
+
+    /**
+     * Returns a list of tests to add to the existing list.
+     *
+     * @return array An array of tests
+     */
+    public function getTests();
+
+    /**
+     * Returns a list of functions to add to the existing list.
+     *
+     * @return array An array of functions
+     */
+    public function getFunctions();
+
+    /**
+     * Returns a list of operators to add to the existing list.
+     *
+     * @return array An array of operators
+     */
+    public function getOperators();
+
+    /**
+     * Returns a list of global variables to add to the existing list.
+     *
+     * @return array An array of global variables
+     */
+    public function getGlobals();
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName();
+}
diff --git a/inc/Twig/Extensions/Autoloader.php b/inc/Twig/Extensions/Autoloader.php
new file mode 100644
index 00000000..f23cced6
--- /dev/null
+++ b/inc/Twig/Extensions/Autoloader.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Autoloads Twig Extensions classes.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Twig_Extensions_Autoloader
+{
+    /**
+     * Registers Twig_Extensions_Autoloader as an SPL autoloader.
+     */
+    static public function register()
+    {
+        spl_autoload_register(array(new self, 'autoload'));
+    }
+
+    /**
+     * Handles autoloading of classes.
+     *
+     * @param  string  $class  A class name.
+     *
+     * @return boolean Returns true if the class has been loaded
+     */
+    static public function autoload($class)
+    {
+        if (0 !== strpos($class, 'Twig_Extensions')) {
+            return;
+        }
+
+        if (file_exists($file = dirname(__FILE__).'/../../'.str_replace('_', '/', $class).'.php')) {
+            require $file;
+        }
+    }
+}
diff --git a/inc/Twig/Extensions/Extension/Debug.php b/inc/Twig/Extensions/Extension/Debug.php
new file mode 100644
index 00000000..8974ce20
--- /dev/null
+++ b/inc/Twig/Extensions/Extension/Debug.php
@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Extension_Debug extends Twig_Extension
+{
+    /**
+     * Returns the token parser instance to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParser instances
+     */
+    public function getTokenParsers()
+    {
+        return array(
+            new Twig_Extensions_TokenParser_Debug(),
+        );
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'debug';
+    }
+}
diff --git a/inc/Twig/Extensions/Extension/I18n.php b/inc/Twig/Extensions/Extension/I18n.php
new file mode 100644
index 00000000..3702aa22
--- /dev/null
+++ b/inc/Twig/Extensions/Extension/I18n.php
@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Extension_I18n extends Twig_Extension
+{
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers()
+    {
+        return array(new Twig_Extensions_TokenParser_Trans());
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters()
+    {
+        return array(
+            'trans' => new Twig_Filter_Function('gettext'),
+        );
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'i18n';
+    }
+}
diff --git a/inc/Twig/Extensions/Extension/Intl.php b/inc/Twig/Extensions/Extension/Intl.php
new file mode 100644
index 00000000..40f7fc20
--- /dev/null
+++ b/inc/Twig/Extensions/Extension/Intl.php
@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+class Twig_Extensions_Extension_Intl extends Twig_Extension
+{
+    public function __construct()
+    {
+        if (!class_exists('IntlDateFormatter')) {
+            throw new RuntimeException('The intl extension is needed to use intl-based filters.');
+        }
+    }
+
+    /**
+     * Returns a list of filters to add to the existing list.
+     *
+     * @return array An array of filters
+     */
+    public function getFilters()
+    {
+        return array(
+            'localizeddate' => new Twig_Filter_Function('twig_localized_date_filter', array('needs_environment' => true)),
+        );
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'intl';
+    }
+}
+
+function twig_localized_date_filter(Twig_Environment $env, $date, $dateFormat = 'medium', $timeFormat = 'medium', $locale = null, $timezone = null, $format = null)
+{
+    $date = twig_date_converter($env, $date, $timezone);
+
+    $formatValues = array(
+        'none'   => IntlDateFormatter::NONE,
+        'short'  => IntlDateFormatter::SHORT,
+        'medium' => IntlDateFormatter::MEDIUM,
+        'long'   => IntlDateFormatter::LONG,
+        'full'   => IntlDateFormatter::FULL,
+    );
+
+    $formatter = IntlDateFormatter::create(
+        $locale !== null ? $locale : Locale::getDefault(),
+        $formatValues[$dateFormat],
+        $formatValues[$timeFormat],
+        $date->getTimezone()->getName(),
+        IntlDateFormatter::GREGORIAN,
+        $format
+    );
+
+    return $formatter->format($date->getTimestamp());
+}
diff --git a/inc/Twig/Extensions/Extension/Text.php b/inc/Twig/Extensions/Extension/Text.php
new file mode 100644
index 00000000..0a3dc35e
--- /dev/null
+++ b/inc/Twig/Extensions/Extension/Text.php
@@ -0,0 +1,109 @@
+<?php
+
+/**
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @author Henrik Bjornskov <hb@peytz.dk>
+ * @package Twig
+ * @subpackage Twig-extensions
+ */
+class Twig_Extensions_Extension_Text extends Twig_Extension
+{
+    /**
+     * Returns a list of filters.
+     *
+     * @return array
+     */
+    public function getFilters()
+    {
+        $filters = array(
+            'truncate' => new Twig_Filter_Function('twig_truncate_filter', array('needs_environment' => true)),
+            'wordwrap' => new Twig_Filter_Function('twig_wordwrap_filter', array('needs_environment' => true)),
+        );
+
+        if (version_compare(Twig_Environment::VERSION, '1.5.0-DEV', '<')) {
+            $filters['nl2br'] = new Twig_Filter_Function('twig_nl2br_filter', array('pre_escape' => 'html', 'is_safe' => array('html')));
+        }
+
+        return $filters;
+    }
+
+    /**
+     * Name of this extension
+     *
+     * @return string
+     */
+    public function getName()
+    {
+        return 'Text';
+    }
+}
+
+function twig_nl2br_filter($value, $sep = '<br />')
+{
+    return str_replace("\n", $sep."\n", $value);
+}
+
+if (function_exists('mb_get_info')) {
+    function twig_truncate_filter(Twig_Environment $env, $value, $length = 30, $preserve = false, $separator = '...')
+    {
+        if (mb_strlen($value, $env->getCharset()) > $length) {
+            if ($preserve) {
+                if (false !== ($breakpoint = mb_strpos($value, ' ', $length, $env->getCharset()))) {
+                    $length = $breakpoint;
+                }
+            }
+
+            return rtrim(mb_substr($value, 0, $length, $env->getCharset())) . $separator;
+        }
+
+        return $value;
+    }
+
+    function twig_wordwrap_filter(Twig_Environment $env, $value, $length = 80, $separator = "\n", $preserve = false)
+    {
+        $sentences = array();
+
+        $previous = mb_regex_encoding();
+        mb_regex_encoding($env->getCharset());
+
+        $pieces = mb_split($separator, $value);
+        mb_regex_encoding($previous);
+
+        foreach ($pieces as $piece) {
+            while(!$preserve && mb_strlen($piece, $env->getCharset()) > $length) {
+                $sentences[] = mb_substr($piece, 0, $length, $env->getCharset());
+                $piece = mb_substr($piece, $length, 2048, $env->getCharset());
+            }
+
+            $sentences[] = $piece;
+        }
+
+        return implode($separator, $sentences);
+    }
+} else {
+    function twig_truncate_filter(Twig_Environment $env, $value, $length = 30, $preserve = false, $separator = '...')
+    {
+        if (strlen($value) > $length) {
+            if ($preserve) {
+                if (false !== ($breakpoint = strpos($value, ' ', $length))) {
+                    $length = $breakpoint;
+                }
+            }
+
+            return rtrim(substr($value, 0, $length)) . $separator;
+        }
+
+        return $value;
+    }
+
+    function twig_wordwrap_filter(Twig_Environment $env, $value, $length = 80, $separator = "\n", $preserve = false)
+    {
+        return wordwrap($value, $length, $separator, !$preserve);
+    }
+}
\ No newline at end of file
diff --git a/inc/Twig/Extensions/Gettext/Extractor.php b/inc/Twig/Extensions/Gettext/Extractor.php
new file mode 100644
index 00000000..e7fa1af2
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Extractor.php
@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext;
+
+use Symfony\Component\Filesystem\Filesystem;
+
+/**
+ * Extracts translations from twig templates.
+ *
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class Extractor
+{
+    /**
+     * @var \Twig_Environment
+     */
+    protected $environment;
+
+    /**
+     * Template cached file names.
+     *
+     * @var string[]
+     */
+    protected $templates;
+
+    /**
+     * Gettext parameters.
+     *
+     * @var string[]
+     */
+    protected $parameters;
+
+    public function __construct(\Twig_Environment $environment)
+    {
+        $this->environment = $environment;
+        $this->reset();
+    }
+
+    protected function reset()
+    {
+        $this->templates = array();
+        $this->parameters = array();
+    }
+
+    public function addTemplate($path)
+    {
+        $this->environment->loadTemplate($path);
+        $this->templates[] = $this->environment->getCacheFilename($path);
+    }
+
+    public function addGettextParameter($parameter)
+    {
+        $this->parameters[] = $parameter;
+    }
+
+    public function setGettextParameters(array $parameters)
+    {
+        $this->parameters = $parameters;
+    }
+
+    public function extract()
+    {
+        $command = 'xgettext';
+        $command .= ' '.join(' ', $this->parameters);
+        $command .= ' '.join(' ', $this->templates);
+
+        $error = 0;
+        $output = system($command, $error);
+        if (0 !== $error) {
+            throw new \RuntimeException(sprintf(
+                'Gettext command "%s" failed with error code %s and output: %s',
+                $command,
+                $error,
+                $output
+            ));
+        }
+
+        $this->reset();
+    }
+
+    public function __destruct()
+    {
+        $filesystem = new Filesystem();
+        $filesystem->remove($this->environment->getCache());
+    }
+}
diff --git a/inc/Twig/Extensions/Gettext/Loader/Filesystem.php b/inc/Twig/Extensions/Gettext/Loader/Filesystem.php
new file mode 100644
index 00000000..b011b032
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Loader/Filesystem.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext\Loader;
+
+/**
+ * Loads template from the filesystem.
+ *
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class Filesystem extends \Twig_Loader_Filesystem
+{
+    /**
+     * Hacked find template to allow loading templates by absolute path.
+     *
+     * @param string $name template name or absolute path
+     */
+    protected function findTemplate($name)
+    {
+        // normalize name
+        $name = preg_replace('#/{2,}#', '/', strtr($name, '\\', '/'));
+
+        if (isset($this->cache[$name])) {
+            return $this->cache[$name];
+        }
+
+        $this->validateName($name);
+
+        $namespace = '__main__';
+        if (isset($name[0]) && '@' == $name[0]) {
+            if (false === $pos = strpos($name, '/')) {
+                throw new \InvalidArgumentException(sprintf('Malformed namespaced template name "%s" (expecting "@namespace/template_name").', $name));
+            }
+
+            $namespace = substr($name, 1, $pos - 1);
+
+            $name = substr($name, $pos + 1);
+        }
+
+        if (!isset($this->paths[$namespace])) {
+            throw new \Twig_Error_Loader(sprintf('There are no registered paths for namespace "%s".', $namespace));
+        }
+
+        if (is_file($name)) {
+            return $this->cache[$name] = $name;
+        }
+
+        return __DIR__.'/../Test/Fixtures/twig/empty.twig';
+    }
+}
diff --git a/inc/Twig/Extensions/Gettext/Routing/Generator/UrlGenerator.php b/inc/Twig/Extensions/Gettext/Routing/Generator/UrlGenerator.php
new file mode 100644
index 00000000..9e3431bd
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Routing/Generator/UrlGenerator.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext\Routing\Generator;
+
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Routing\RequestContext;
+
+/**
+ * Dummy url generator.
+ *
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class UrlGenerator implements UrlGeneratorInterface
+{
+    protected $context;
+
+    public function generate($name, $parameters = array(), $absolute = false)
+    {
+    }
+
+    public function getContext()
+    {
+        return $this->context;
+    }
+
+    public function setContext(RequestContext $context)
+    {
+        $this->context = $context;
+    }
+}
diff --git a/inc/Twig/Extensions/Gettext/Test/ExtractorTest.php b/inc/Twig/Extensions/Gettext/Test/ExtractorTest.php
new file mode 100644
index 00000000..d467835f
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Test/ExtractorTest.php
@@ -0,0 +1,123 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext\Test;
+
+use Twig\Gettext\Extractor;
+use Twig\Gettext\Loader\Filesystem;
+use Symfony\Component\Translation\Loader\PoFileLoader;
+
+/**
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class ExtractorTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \Twig_Environment
+     */
+    protected $twig;
+
+    /**
+     * @var PoFileLoader
+     */
+    protected $loader;
+
+    protected function setUp()
+    {
+        $this->twig = new \Twig_Environment(new Filesystem('/'), array(
+            'cache'       => '/tmp/cache/'.uniqid(),
+            'auto_reload' => true
+        ));
+        $this->twig->addExtension(new \Twig_Extensions_Extension_I18n());
+
+        $this->loader = new PoFileLoader();
+    }
+
+    /**
+     * @dataProvider testExtractDataProvider
+     */
+    public function testExtract(array $templates, array $parameters, array $messages)
+    {
+        $extractor = new Extractor($this->twig);
+
+        foreach ($templates as $template) {
+            $extractor->addTemplate($template);
+        }
+        foreach ($parameters as $parameter) {
+            $extractor->addGettextParameter($parameter);
+        }
+
+        $extractor->extract();
+
+        $catalog = $this->loader->load($this->getPotFile(), null);
+
+        foreach ($messages as $message) {
+            $this->assertTrue(
+                $catalog->has($message),
+                sprintf('Message "%s" not found in catalog.', $message)
+            );
+        }
+    }
+
+    public function testExtractDataProvider()
+    {
+        return array(
+            array(
+                array(
+                    __DIR__.'/Fixtures/twig/singular.twig',
+                    __DIR__.'/Fixtures/twig/plural.twig',
+                ),
+                $this->getGettextParameters(),
+                array(
+                    'Hello %name%!',
+                    'Hello World!',
+                    'Hey %name%, I have one apple.',
+                    'Hey %name%, I have %count% apples.',
+                ),
+            ),
+        );
+    }
+
+    public function testExtractNoTranslations()
+    {
+        $extractor = new Extractor($this->twig);
+
+        $extractor->addTemplate(__DIR__.'/Fixtures/twig/empty.twig');
+        $extractor->setGettextParameters($this->getGettextParameters());
+
+        $extractor->extract();
+
+        $catalog = $this->loader->load($this->getPotFile(), null);
+
+        $this->assertEmpty($catalog->all('messages'));
+    }
+
+    private function getPotFile()
+    {
+        return __DIR__.'/Fixtures/messages.pot';
+    }
+
+    private function getGettextParameters()
+    {
+        return array(
+            '--force-po',
+            '-o',
+            $this->getPotFile(),
+        );
+    }
+
+    protected function tearDown()
+    {
+        if (file_exists($this->getPotFile())) {
+            unlink($this->getPotFile());
+        }
+    }
+}
diff --git a/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/empty.twig b/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/empty.twig
new file mode 100644
index 00000000..05f0d26a
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/empty.twig
@@ -0,0 +1 @@
+Nothing to translate here.
diff --git a/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/plural.twig b/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/plural.twig
new file mode 100644
index 00000000..f9754ff4
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/plural.twig
@@ -0,0 +1,5 @@
+{% trans %}
+    Hey {{ name }}, I have one apple.
+{% plural apple_count %}
+    Hey {{ name }}, I have {{ count }} apples.
+{% endtrans %}
diff --git a/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/singular.twig b/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/singular.twig
new file mode 100644
index 00000000..d757cf90
--- /dev/null
+++ b/inc/Twig/Extensions/Gettext/Test/Fixtures/twig/singular.twig
@@ -0,0 +1,9 @@
+{% trans "Hello World!" %}
+
+{% trans %}
+    Hello World!
+{% endtrans %}
+
+{% trans %}
+    Hello {{ name }}!
+{% endtrans %}
diff --git a/inc/Twig/Extensions/Grammar.php b/inc/Twig/Extensions/Grammar.php
new file mode 100644
index 00000000..4d031b19
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Extensions_Grammar implements Twig_Extensions_GrammarInterface
+{
+    protected $name;
+    protected $parser;
+
+    public function __construct($name)
+    {
+        $this->name = $name;
+    }
+
+    public function setParser(Twig_ParserInterface $parser)
+    {
+        $this->parser = $parser;
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Arguments.php b/inc/Twig/Extensions/Grammar/Arguments.php
new file mode 100644
index 00000000..158c05ac
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Arguments.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Arguments extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s:arguments>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        return $this->parser->getExpressionParser()->parseArguments();
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Array.php b/inc/Twig/Extensions/Grammar/Array.php
new file mode 100644
index 00000000..34aece0f
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Array.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Array extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s:array>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        return $this->parser->getExpressionParser()->parseArrayExpression();
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Body.php b/inc/Twig/Extensions/Grammar/Body.php
new file mode 100644
index 00000000..540cfc75
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Body.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Body extends Twig_Extensions_Grammar
+{
+    protected $end;
+
+    public function __construct($name, $end = null)
+    {
+        parent::__construct($name);
+
+        $this->end = null === $end ? 'end'.$name : $end;
+    }
+
+    public function __toString()
+    {
+        return sprintf('<%s:body>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test($this->end);
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Boolean.php b/inc/Twig/Extensions/Grammar/Boolean.php
new file mode 100644
index 00000000..c0048090
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Boolean.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Boolean extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s:boolean>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, array('true', 'false'));
+
+        return new Twig_Node_Expression_Constant('true' === $token->getValue() ? true : false, $token->getLine());
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Constant.php b/inc/Twig/Extensions/Grammar/Constant.php
new file mode 100644
index 00000000..9df60458
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Constant.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Constant extends Twig_Extensions_Grammar
+{
+    protected $type;
+
+    public function __construct($name, $type = null)
+    {
+        $this->name = $name;
+        $this->type = null === $type ? Twig_Token::NAME_TYPE : $type;
+    }
+
+    public function __toString()
+    {
+        return $this->name;
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        $this->parser->getStream()->expect($this->type, $this->name);
+
+        return $this->name;
+    }
+
+    public function getType()
+    {
+        return $this->type;
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Expression.php b/inc/Twig/Extensions/Grammar/Expression.php
new file mode 100644
index 00000000..4c33df0e
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Expression.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Expression extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        return $this->parser->getExpressionParser()->parseExpression();
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Hash.php b/inc/Twig/Extensions/Grammar/Hash.php
new file mode 100644
index 00000000..98b07d20
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Hash.php
@@ -0,0 +1,22 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Hash extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s:hash>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        return $this->parser->getExpressionParser()->parseHashExpression();
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Number.php b/inc/Twig/Extensions/Grammar/Number.php
new file mode 100644
index 00000000..f0857d20
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Number.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Number extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s:number>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        $this->parser->getStream()->expect(Twig_Token::NUMBER_TYPE);
+
+        return new Twig_Node_Expression_Constant($token->getValue(), $token->getLine());
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Optional.php b/inc/Twig/Extensions/Grammar/Optional.php
new file mode 100644
index 00000000..da427485
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Optional.php
@@ -0,0 +1,69 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Optional extends Twig_Extensions_Grammar
+{
+    protected $grammar;
+
+    public function __construct()
+    {
+        $this->grammar = array();
+        foreach (func_get_args() as $grammar) {
+            $this->addGrammar($grammar);
+        }
+    }
+
+    public function __toString()
+    {
+        $repr = array();
+        foreach ($this->grammar as $grammar) {
+            $repr[] = (string) $grammar;
+        }
+
+        return sprintf('[%s]', implode(' ', $repr));
+    }
+
+    public function addGrammar(Twig_Extensions_GrammarInterface $grammar)
+    {
+        $this->grammar[] = $grammar;
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        // test if we have the optional element before consuming it
+        if ($this->grammar[0] instanceof Twig_Extensions_Grammar_Constant) {
+            if (!$this->parser->getStream()->test($this->grammar[0]->getType(), $this->grammar[0]->getName())) {
+                return array();
+            }
+        } elseif ($this->grammar[0] instanceof Twig_Extensions_Grammar_Name) {
+            if (!$this->parser->getStream()->test(Twig_Token::NAME_TYPE)) {
+                return array();
+            }
+        } elseif ($this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE)) {
+            // if this is not a Constant or a Name, it must be the last element of the tag
+
+            return array();
+        }
+
+        $elements = array();
+        foreach ($this->grammar as $grammar) {
+            $grammar->setParser($this->parser);
+
+            $element = $grammar->parse($token);
+            if (is_array($element)) {
+                $elements = array_merge($elements, $element);
+            } else {
+                $elements[$grammar->getName()] = $element;
+            }
+        }
+
+        return $elements;
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Switch.php b/inc/Twig/Extensions/Grammar/Switch.php
new file mode 100644
index 00000000..4245f2c8
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Switch.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Switch extends Twig_Extensions_Grammar
+{
+    public function __toString()
+    {
+        return sprintf('<%s:switch>', $this->name);
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        $this->parser->getStream()->expect(Twig_Token::NAME_TYPE, $this->name);
+
+        return new Twig_Node_Expression_Constant(true, $token->getLine());
+    }
+}
diff --git a/inc/Twig/Extensions/Grammar/Tag.php b/inc/Twig/Extensions/Grammar/Tag.php
new file mode 100644
index 00000000..727f2610
--- /dev/null
+++ b/inc/Twig/Extensions/Grammar/Tag.php
@@ -0,0 +1,56 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_Grammar_Tag extends Twig_Extensions_Grammar
+{
+    protected $grammar;
+
+    public function __construct()
+    {
+        $this->grammar = array();
+        foreach (func_get_args() as $grammar) {
+            $this->addGrammar($grammar);
+        }
+    }
+
+    public function __toString()
+    {
+        $repr = array();
+        foreach ($this->grammar as $grammar) {
+            $repr[] = (string) $grammar;
+        }
+
+        return implode(' ', $repr);
+    }
+
+    public function addGrammar(Twig_Extensions_GrammarInterface $grammar)
+    {
+        $this->grammar[] = $grammar;
+    }
+
+    public function parse(Twig_Token $token)
+    {
+        $elements = array();
+        foreach ($this->grammar as $grammar) {
+            $grammar->setParser($this->parser);
+
+            $element = $grammar->parse($token);
+            if (is_array($element)) {
+                $elements = array_merge($elements, $element);
+            } else {
+                $elements[$grammar->getName()] = $element;
+            }
+        }
+
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return $elements;
+    }
+}
diff --git a/inc/Twig/Extensions/GrammarInterface.php b/inc/Twig/Extensions/GrammarInterface.php
new file mode 100644
index 00000000..22713bf2
--- /dev/null
+++ b/inc/Twig/Extensions/GrammarInterface.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+interface Twig_Extensions_GrammarInterface
+{
+    function setParser(Twig_ParserInterface $parser);
+
+    function parse(Twig_Token $token);
+
+    function getName();
+}
diff --git a/inc/Twig/Extensions/Node/Debug.php b/inc/Twig/Extensions/Node/Debug.php
new file mode 100644
index 00000000..7d01bbe5
--- /dev/null
+++ b/inc/Twig/Extensions/Node/Debug.php
@@ -0,0 +1,69 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a debug node.
+ *
+ * @package    twig
+ * @subpackage Twig-extensions
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ * @version    SVN: $Id$
+ */
+class Twig_Extensions_Node_Debug extends Twig_Node
+{
+    public function __construct(Twig_Node_Expression $expr = null, $lineno, $tag = null)
+    {
+        parent::__construct(array('expr' => $expr), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->addDebugInfo($this);
+
+        $compiler
+            ->write("if (\$this->env->isDebug()) {\n")
+            ->indent()
+        ;
+
+        if (null === $this->getNode('expr')) {
+            // remove embedded templates (macros) from the context
+            $compiler
+                ->write("\$vars = array();\n")
+                ->write("foreach (\$context as \$key => \$value) {\n")
+                ->indent()
+                ->write("if (!\$value instanceof Twig_Template) {\n")
+                ->indent()
+                ->write("\$vars[\$key] = \$value;\n")
+                ->outdent()
+                ->write("}\n")
+                ->outdent()
+                ->write("}\n")
+                ->write("var_dump(\$vars);\n")
+            ;
+        } else {
+            $compiler
+                ->write("var_dump(")
+                ->subcompile($this->getNode('expr'))
+                ->raw(");\n")
+            ;
+        }
+
+        $compiler
+            ->outdent()
+            ->write("}\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Extensions/Node/Trans.php b/inc/Twig/Extensions/Node/Trans.php
new file mode 100644
index 00000000..d12564a7
--- /dev/null
+++ b/inc/Twig/Extensions/Node/Trans.php
@@ -0,0 +1,133 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a trans node.
+ *
+ * @package    twig
+ * @author     Fabien Potencier <fabien.potencier@symfony-project.com>
+ */
+class Twig_Extensions_Node_Trans extends Twig_Node
+{
+    public function __construct(Twig_NodeInterface $body, Twig_NodeInterface $plural = null, Twig_Node_Expression $count = null, $lineno, $tag = null)
+    {
+        parent::__construct(array('count' => $count, 'body' => $body, 'plural' => $plural), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->addDebugInfo($this);
+
+        list($msg, $vars) = $this->compileString($this->getNode('body'));
+
+        if (null !== $this->getNode('plural')) {
+            list($msg1, $vars1) = $this->compileString($this->getNode('plural'));
+
+            $vars = array_merge($vars, $vars1);
+        }
+
+        $function = null === $this->getNode('plural') ? 'gettext' : 'ngettext';
+
+        if ($vars) {
+            $compiler
+                ->write('echo strtr('.$function.'(')
+                ->subcompile($msg)
+            ;
+
+            if (null !== $this->getNode('plural')) {
+                $compiler
+                    ->raw(', ')
+                    ->subcompile($msg1)
+                    ->raw(', abs(')
+                    ->subcompile($this->getNode('count'))
+                    ->raw(')')
+                ;
+            }
+
+            $compiler->raw('), array(');
+
+            foreach ($vars as $var) {
+                if ('count' === $var->getAttribute('name')) {
+                    $compiler
+                        ->string('%count%')
+                        ->raw(' => abs(')
+                        ->subcompile($this->getNode('count'))
+                        ->raw('), ')
+                    ;
+                } else {
+                    $compiler
+                        ->string('%'.$var->getAttribute('name').'%')
+                        ->raw(' => ')
+                        ->subcompile($var)
+                        ->raw(', ')
+                    ;
+                }
+            }
+
+            $compiler->raw("));\n");
+        } else {
+            $compiler
+                ->write('echo '.$function.'(')
+                ->subcompile($msg)
+            ;
+
+            if (null !== $this->getNode('plural')) {
+                $compiler
+                    ->raw(', ')
+                    ->subcompile($msg1)
+                    ->raw(', abs(')
+                    ->subcompile($this->getNode('count'))
+                    ->raw(')')
+                ;
+            }
+
+            $compiler->raw(");\n");
+        }
+    }
+
+    protected function compileString(Twig_NodeInterface $body)
+    {
+        if ($body instanceof Twig_Node_Expression_Name || $body instanceof Twig_Node_Expression_Constant || $body instanceof Twig_Node_Expression_TempName) {
+            return array($body, array());
+        }
+
+        $vars = array();
+        if (count($body)) {
+            $msg = '';
+
+            foreach ($body as $node) {
+                if (get_class($node) === 'Twig_Node' && $node->getNode(0) instanceof Twig_Node_SetTemp) {
+                    $node = $node->getNode(1);
+                }
+
+                if ($node instanceof Twig_Node_Print) {
+                    $n = $node->getNode('expr');
+                    while ($n instanceof Twig_Node_Expression_Filter) {
+                        $n = $n->getNode('node');
+                    }
+                    $msg .= sprintf('%%%s%%', $n->getAttribute('name'));
+                    $vars[] = new Twig_Node_Expression_Name($n->getAttribute('name'), $n->getLine());
+                } else {
+                    $msg .= $node->getAttribute('data');
+                }
+            }
+        } else {
+            $msg = $body->getAttribute('data');
+        }
+
+        return array(new Twig_Node(array(new Twig_Node_Expression_Constant(trim($msg), $body->getLine()))), $vars);
+    }
+}
diff --git a/inc/Twig/Extensions/SimpleTokenParser.php b/inc/Twig/Extensions/SimpleTokenParser.php
new file mode 100644
index 00000000..49546487
--- /dev/null
+++ b/inc/Twig/Extensions/SimpleTokenParser.php
@@ -0,0 +1,132 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Extensions_SimpleTokenParser extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $grammar = $this->getGrammar();
+        if (!is_object($grammar)) {
+            $grammar = self::parseGrammar($grammar);
+        }
+
+        $grammar->setParser($this->parser);
+        $values = $grammar->parse($token);
+
+        return $this->getNode($values, $token->getLine());
+    }
+
+    /**
+     * Gets the grammar as an object or as a string.
+     *
+     * @return string|Twig_Extensions_Grammar A Twig_Extensions_Grammar instance or a string
+     */
+    abstract protected function getGrammar();
+
+    /**
+     * Gets the nodes based on the parsed values.
+     *
+     * @param array   $values An array of values
+     * @param integer $line   The parser line
+     */
+    abstract protected function getNode(array $values, $line);
+
+    protected function getAttribute($node, $attribute, $arguments = array(), $type = Twig_Node_Expression_GetAttr::TYPE_ANY, $line = -1)
+    {
+        return new Twig_Node_Expression_GetAttr(
+            $node instanceof Twig_NodeInterface ? $node : new Twig_Node_Expression_Name($node, $line),
+            $attribute instanceof Twig_NodeInterface ? $attribute : new Twig_Node_Expression_Constant($attribute, $line),
+            $arguments instanceof Twig_NodeInterface ? $arguments : new Twig_Node($arguments),
+            $type,
+            $line
+        );
+    }
+
+    protected function call($node, $attribute, $arguments = array(), $line = -1)
+    {
+        return $this->getAttribute($node, $attribute, $arguments, Twig_Node_Expression_GetAttr::TYPE_METHOD, $line);
+    }
+
+    protected function markAsSafe(Twig_NodeInterface $node, $line = -1)
+    {
+        return new Twig_Node_Expression_Filter(
+            $node,
+            new Twig_Node_Expression_Constant('raw', $line),
+            new Twig_Node(),
+            $line
+        );
+    }
+
+    protected function output(Twig_NodeInterface $node, $line = -1)
+    {
+        return new Twig_Node_Print($node, $line);
+    }
+
+    protected function getNodeValues(array $values)
+    {
+        $nodes = array();
+        foreach ($values as $value) {
+            if ($value instanceof Twig_NodeInterface) {
+                $nodes[] = $value;
+            }
+        }
+
+        return $nodes;
+    }
+
+    static public function parseGrammar($str, $main = true)
+    {
+        static $cursor;
+
+        if (true === $main) {
+            $cursor = 0;
+            $grammar = new Twig_Extensions_Grammar_Tag();
+        } else {
+            $grammar = new Twig_Extensions_Grammar_Optional();
+        }
+
+        while ($cursor < strlen($str)) {
+            if (preg_match('/\s+/A', $str, $match, null, $cursor)) {
+                $cursor += strlen($match[0]);
+            } elseif (preg_match('/<(\w+)(?:\:(\w+))?>/A', $str, $match, null, $cursor)) {
+                $class = sprintf('Twig_Extensions_Grammar_%s', ucfirst(isset($match[2]) ? $match[2] : 'Expression'));
+                if (!class_exists($class)) {
+                    throw new Twig_Error_Runtime(sprintf('Unable to understand "%s" in grammar (%s class does not exist)', $match[0], $class));
+                }
+                $grammar->addGrammar(new $class($match[1]));
+                $cursor += strlen($match[0]);
+            } elseif (preg_match('/\w+/A', $str, $match, null, $cursor)) {
+                $grammar->addGrammar(new Twig_Extensions_Grammar_Constant($match[0]));
+                $cursor += strlen($match[0]);
+            } elseif (preg_match('/,/A', $str, $match, null, $cursor)) {
+                $grammar->addGrammar(new Twig_Extensions_Grammar_Constant($match[0], Twig_Token::PUNCTUATION_TYPE));
+                $cursor += strlen($match[0]);
+            } elseif (preg_match('/\[/A', $str, $match, null, $cursor)) {
+                $cursor += strlen($match[0]);
+                $grammar->addGrammar(self::parseGrammar($str, false));
+            } elseif (true !== $main && preg_match('/\]/A', $str, $match, null, $cursor)) {
+                $cursor += strlen($match[0]);
+
+                return $grammar;
+            } else {
+                throw new Twig_Error_Runtime(sprintf('Unable to parse grammar "%s" near "...%s..."', $str, substr($str, $cursor, 10)));
+            }
+        }
+
+        return $grammar;
+    }
+}
diff --git a/inc/Twig/Extensions/TokenParser/Debug.php b/inc/Twig/Extensions/TokenParser/Debug.php
new file mode 100644
index 00000000..4a7dfcc0
--- /dev/null
+++ b/inc/Twig/Extensions/TokenParser/Debug.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009-2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_TokenParser_Debug extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+
+        $expr = null;
+        if (!$this->parser->getStream()->test(Twig_Token::BLOCK_END_TYPE)) {
+            $expr = $this->parser->getExpressionParser()->parseExpression();
+        }
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Extensions_Node_Debug($expr, $lineno, $this->getTag());
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @param string The tag name
+     */
+    public function getTag()
+    {
+        return 'debug';
+    }
+}
diff --git a/inc/Twig/Extensions/TokenParser/Trans.php b/inc/Twig/Extensions/TokenParser/Trans.php
new file mode 100644
index 00000000..5e2dc464
--- /dev/null
+++ b/inc/Twig/Extensions/TokenParser/Trans.php
@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extensions_TokenParser_Trans extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+        $count = null;
+        $plural = null;
+
+        if (!$stream->test(Twig_Token::BLOCK_END_TYPE)) {
+            $body = $this->parser->getExpressionParser()->parseExpression();
+        } else {
+            $stream->expect(Twig_Token::BLOCK_END_TYPE);
+            $body = $this->parser->subparse(array($this, 'decideForFork'));
+            if ('plural' === $stream->next()->getValue()) {
+                $count = $this->parser->getExpressionParser()->parseExpression();
+                $stream->expect(Twig_Token::BLOCK_END_TYPE);
+                $plural = $this->parser->subparse(array($this, 'decideForEnd'), true);
+            }
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $this->checkTransString($body, $lineno);
+
+        return new Twig_Extensions_Node_Trans($body, $plural, $count, $lineno, $this->getTag());
+    }
+
+    public function decideForFork(Twig_Token $token)
+    {
+        return $token->test(array('plural', 'endtrans'));
+    }
+
+    public function decideForEnd(Twig_Token $token)
+    {
+        return $token->test('endtrans');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @param string The tag name
+     */
+    public function getTag()
+    {
+        return 'trans';
+    }
+
+    protected function checkTransString(Twig_NodeInterface $body, $lineno)
+    {
+        foreach ($body as $i => $node) {
+            if (
+                $node instanceof Twig_Node_Text
+                ||
+                ($node instanceof Twig_Node_Print && $node->getNode('expr') instanceof Twig_Node_Expression_Name)
+            ) {
+                continue;
+            }
+
+            throw new Twig_Error_Syntax(sprintf('The text to be translated with "trans" can only contain references to simple variables'), $lineno);
+        }
+    }
+}
diff --git a/inc/Twig/Filter.php b/inc/Twig/Filter.php
new file mode 100644
index 00000000..5cfbb662
--- /dev/null
+++ b/inc/Twig/Filter.php
@@ -0,0 +1,81 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template filter.
+ *
+ * Use Twig_SimpleFilter instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+abstract class Twig_Filter implements Twig_FilterInterface, Twig_FilterCallableInterface
+{
+    protected $options;
+    protected $arguments = array();
+
+    public function __construct(array $options = array())
+    {
+        $this->options = array_merge(array(
+            'needs_environment' => false,
+            'needs_context'     => false,
+            'pre_escape'        => null,
+            'preserves_safety'  => null,
+            'callable'          => null,
+        ), $options);
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    public function needsEnvironment()
+    {
+        return $this->options['needs_environment'];
+    }
+
+    public function needsContext()
+    {
+        return $this->options['needs_context'];
+    }
+
+    public function getSafe(Twig_Node $filterArgs)
+    {
+        if (isset($this->options['is_safe'])) {
+            return $this->options['is_safe'];
+        }
+
+        if (isset($this->options['is_safe_callback'])) {
+            return call_user_func($this->options['is_safe_callback'], $filterArgs);
+        }
+    }
+
+    public function getPreservesSafety()
+    {
+        return $this->options['preserves_safety'];
+    }
+
+    public function getPreEscape()
+    {
+        return $this->options['pre_escape'];
+    }
+
+    public function getCallable()
+    {
+        return $this->options['callable'];
+    }
+}
diff --git a/inc/Twig/Filter/Function.php b/inc/Twig/Filter/Function.php
new file mode 100644
index 00000000..ad374a55
--- /dev/null
+++ b/inc/Twig/Filter/Function.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a function template filter.
+ *
+ * Use Twig_SimpleFilter instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Filter_Function extends Twig_Filter
+{
+    protected $function;
+
+    public function __construct($function, array $options = array())
+    {
+        $options['callable'] = $function;
+
+        parent::__construct($options);
+
+        $this->function = $function;
+    }
+
+    public function compile()
+    {
+        return $this->function;
+    }
+}
diff --git a/inc/Twig/Filter/Method.php b/inc/Twig/Filter/Method.php
new file mode 100644
index 00000000..63c8c3be
--- /dev/null
+++ b/inc/Twig/Filter/Method.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a method template filter.
+ *
+ * Use Twig_SimpleFilter instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Filter_Method extends Twig_Filter
+{
+    protected $extension;
+    protected $method;
+
+    public function __construct(Twig_ExtensionInterface $extension, $method, array $options = array())
+    {
+        $options['callable'] = array($extension, $method);
+
+        parent::__construct($options);
+
+        $this->extension = $extension;
+        $this->method = $method;
+    }
+
+    public function compile()
+    {
+        return sprintf('$this->env->getExtension(\'%s\')->%s', $this->extension->getName(), $this->method);
+    }
+}
diff --git a/inc/Twig/Filter/Node.php b/inc/Twig/Filter/Node.php
new file mode 100644
index 00000000..8744c5e0
--- /dev/null
+++ b/inc/Twig/Filter/Node.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template filter as a node.
+ *
+ * Use Twig_SimpleFilter instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Filter_Node extends Twig_Filter
+{
+    protected $class;
+
+    public function __construct($class, array $options = array())
+    {
+        parent::__construct($options);
+
+        $this->class = $class;
+    }
+
+    public function getClass()
+    {
+        return $this->class;
+    }
+
+    public function compile()
+    {
+    }
+}
diff --git a/inc/Twig/FilterCallableInterface.php b/inc/Twig/FilterCallableInterface.php
new file mode 100644
index 00000000..145534df
--- /dev/null
+++ b/inc/Twig/FilterCallableInterface.php
@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a callable template filter.
+ *
+ * Use Twig_SimpleFilter instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_FilterCallableInterface
+{
+    public function getCallable();
+}
diff --git a/inc/Twig/FilterInterface.php b/inc/Twig/FilterInterface.php
new file mode 100644
index 00000000..5319ecc9
--- /dev/null
+++ b/inc/Twig/FilterInterface.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template filter.
+ *
+ * Use Twig_SimpleFilter instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_FilterInterface
+{
+    /**
+     * Compiles a filter.
+     *
+     * @return string The PHP code for the filter
+     */
+    public function compile();
+
+    public function needsEnvironment();
+
+    public function needsContext();
+
+    public function getSafe(Twig_Node $filterArgs);
+
+    public function getPreservesSafety();
+
+    public function getPreEscape();
+
+    public function setArguments($arguments);
+
+    public function getArguments();
+}
diff --git a/inc/Twig/Function.php b/inc/Twig/Function.php
new file mode 100644
index 00000000..b5ffb2b0
--- /dev/null
+++ b/inc/Twig/Function.php
@@ -0,0 +1,71 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+abstract class Twig_Function implements Twig_FunctionInterface, Twig_FunctionCallableInterface
+{
+    protected $options;
+    protected $arguments = array();
+
+    public function __construct(array $options = array())
+    {
+        $this->options = array_merge(array(
+            'needs_environment' => false,
+            'needs_context'     => false,
+            'callable'          => null,
+        ), $options);
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    public function needsEnvironment()
+    {
+        return $this->options['needs_environment'];
+    }
+
+    public function needsContext()
+    {
+        return $this->options['needs_context'];
+    }
+
+    public function getSafe(Twig_Node $functionArgs)
+    {
+        if (isset($this->options['is_safe'])) {
+            return $this->options['is_safe'];
+        }
+
+        if (isset($this->options['is_safe_callback'])) {
+            return call_user_func($this->options['is_safe_callback'], $functionArgs);
+        }
+
+        return array();
+    }
+
+    public function getCallable()
+    {
+        return $this->options['callable'];
+    }
+}
diff --git a/inc/Twig/Function/Function.php b/inc/Twig/Function/Function.php
new file mode 100644
index 00000000..d1e1b96a
--- /dev/null
+++ b/inc/Twig/Function/Function.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2010 Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a function template function.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Function_Function extends Twig_Function
+{
+    protected $function;
+
+    public function __construct($function, array $options = array())
+    {
+        $options['callable'] = $function;
+
+        parent::__construct($options);
+
+        $this->function = $function;
+    }
+
+    public function compile()
+    {
+        return $this->function;
+    }
+}
diff --git a/inc/Twig/Function/Method.php b/inc/Twig/Function/Method.php
new file mode 100644
index 00000000..67039a95
--- /dev/null
+++ b/inc/Twig/Function/Method.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2010 Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a method template function.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Function_Method extends Twig_Function
+{
+    protected $extension;
+    protected $method;
+
+    public function __construct(Twig_ExtensionInterface $extension, $method, array $options = array())
+    {
+        $options['callable'] = array($extension, $method);
+
+        parent::__construct($options);
+
+        $this->extension = $extension;
+        $this->method = $method;
+    }
+
+    public function compile()
+    {
+        return sprintf('$this->env->getExtension(\'%s\')->%s', $this->extension->getName(), $this->method);
+    }
+}
diff --git a/inc/Twig/Function/Node.php b/inc/Twig/Function/Node.php
new file mode 100644
index 00000000..06a0d0db
--- /dev/null
+++ b/inc/Twig/Function/Node.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function as a node.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Function_Node extends Twig_Function
+{
+    protected $class;
+
+    public function __construct($class, array $options = array())
+    {
+        parent::__construct($options);
+
+        $this->class = $class;
+    }
+
+    public function getClass()
+    {
+        return $this->class;
+    }
+
+    public function compile()
+    {
+    }
+}
diff --git a/inc/Twig/FunctionCallableInterface.php b/inc/Twig/FunctionCallableInterface.php
new file mode 100644
index 00000000..0aab4f5e
--- /dev/null
+++ b/inc/Twig/FunctionCallableInterface.php
@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a callable template function.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_FunctionCallableInterface
+{
+    public function getCallable();
+}
diff --git a/inc/Twig/FunctionInterface.php b/inc/Twig/FunctionInterface.php
new file mode 100644
index 00000000..67f4f89c
--- /dev/null
+++ b/inc/Twig/FunctionInterface.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ * (c) 2010 Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function.
+ *
+ * Use Twig_SimpleFunction instead.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_FunctionInterface
+{
+    /**
+     * Compiles a function.
+     *
+     * @return string The PHP code for the function
+     */
+    public function compile();
+
+    public function needsEnvironment();
+
+    public function needsContext();
+
+    public function getSafe(Twig_Node $filterArgs);
+
+    public function setArguments($arguments);
+
+    public function getArguments();
+}
diff --git a/inc/Twig/Gettext/Extractor.php b/inc/Twig/Gettext/Extractor.php
new file mode 100644
index 00000000..e7fa1af2
--- /dev/null
+++ b/inc/Twig/Gettext/Extractor.php
@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext;
+
+use Symfony\Component\Filesystem\Filesystem;
+
+/**
+ * Extracts translations from twig templates.
+ *
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class Extractor
+{
+    /**
+     * @var \Twig_Environment
+     */
+    protected $environment;
+
+    /**
+     * Template cached file names.
+     *
+     * @var string[]
+     */
+    protected $templates;
+
+    /**
+     * Gettext parameters.
+     *
+     * @var string[]
+     */
+    protected $parameters;
+
+    public function __construct(\Twig_Environment $environment)
+    {
+        $this->environment = $environment;
+        $this->reset();
+    }
+
+    protected function reset()
+    {
+        $this->templates = array();
+        $this->parameters = array();
+    }
+
+    public function addTemplate($path)
+    {
+        $this->environment->loadTemplate($path);
+        $this->templates[] = $this->environment->getCacheFilename($path);
+    }
+
+    public function addGettextParameter($parameter)
+    {
+        $this->parameters[] = $parameter;
+    }
+
+    public function setGettextParameters(array $parameters)
+    {
+        $this->parameters = $parameters;
+    }
+
+    public function extract()
+    {
+        $command = 'xgettext';
+        $command .= ' '.join(' ', $this->parameters);
+        $command .= ' '.join(' ', $this->templates);
+
+        $error = 0;
+        $output = system($command, $error);
+        if (0 !== $error) {
+            throw new \RuntimeException(sprintf(
+                'Gettext command "%s" failed with error code %s and output: %s',
+                $command,
+                $error,
+                $output
+            ));
+        }
+
+        $this->reset();
+    }
+
+    public function __destruct()
+    {
+        $filesystem = new Filesystem();
+        $filesystem->remove($this->environment->getCache());
+    }
+}
diff --git a/inc/Twig/Gettext/Loader/Filesystem.php b/inc/Twig/Gettext/Loader/Filesystem.php
new file mode 100644
index 00000000..b011b032
--- /dev/null
+++ b/inc/Twig/Gettext/Loader/Filesystem.php
@@ -0,0 +1,58 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext\Loader;
+
+/**
+ * Loads template from the filesystem.
+ *
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class Filesystem extends \Twig_Loader_Filesystem
+{
+    /**
+     * Hacked find template to allow loading templates by absolute path.
+     *
+     * @param string $name template name or absolute path
+     */
+    protected function findTemplate($name)
+    {
+        // normalize name
+        $name = preg_replace('#/{2,}#', '/', strtr($name, '\\', '/'));
+
+        if (isset($this->cache[$name])) {
+            return $this->cache[$name];
+        }
+
+        $this->validateName($name);
+
+        $namespace = '__main__';
+        if (isset($name[0]) && '@' == $name[0]) {
+            if (false === $pos = strpos($name, '/')) {
+                throw new \InvalidArgumentException(sprintf('Malformed namespaced template name "%s" (expecting "@namespace/template_name").', $name));
+            }
+
+            $namespace = substr($name, 1, $pos - 1);
+
+            $name = substr($name, $pos + 1);
+        }
+
+        if (!isset($this->paths[$namespace])) {
+            throw new \Twig_Error_Loader(sprintf('There are no registered paths for namespace "%s".', $namespace));
+        }
+
+        if (is_file($name)) {
+            return $this->cache[$name] = $name;
+        }
+
+        return __DIR__.'/../Test/Fixtures/twig/empty.twig';
+    }
+}
diff --git a/inc/Twig/Gettext/Routing/Generator/UrlGenerator.php b/inc/Twig/Gettext/Routing/Generator/UrlGenerator.php
new file mode 100644
index 00000000..9e3431bd
--- /dev/null
+++ b/inc/Twig/Gettext/Routing/Generator/UrlGenerator.php
@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext\Routing\Generator;
+
+use Symfony\Component\Routing\Generator\UrlGeneratorInterface;
+use Symfony\Component\Routing\RequestContext;
+
+/**
+ * Dummy url generator.
+ *
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class UrlGenerator implements UrlGeneratorInterface
+{
+    protected $context;
+
+    public function generate($name, $parameters = array(), $absolute = false)
+    {
+    }
+
+    public function getContext()
+    {
+        return $this->context;
+    }
+
+    public function setContext(RequestContext $context)
+    {
+        $this->context = $context;
+    }
+}
diff --git a/inc/Twig/Gettext/Test/ExtractorTest.php b/inc/Twig/Gettext/Test/ExtractorTest.php
new file mode 100644
index 00000000..d467835f
--- /dev/null
+++ b/inc/Twig/Gettext/Test/ExtractorTest.php
@@ -0,0 +1,123 @@
+<?php
+
+/**
+ * This file is part of the Twig Gettext utility.
+ *
+ *  (c) Саша Стаменковић <umpirsky@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Twig\Gettext\Test;
+
+use Twig\Gettext\Extractor;
+use Twig\Gettext\Loader\Filesystem;
+use Symfony\Component\Translation\Loader\PoFileLoader;
+
+/**
+ * @author Саша Стаменковић <umpirsky@gmail.com>
+ */
+class ExtractorTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var \Twig_Environment
+     */
+    protected $twig;
+
+    /**
+     * @var PoFileLoader
+     */
+    protected $loader;
+
+    protected function setUp()
+    {
+        $this->twig = new \Twig_Environment(new Filesystem('/'), array(
+            'cache'       => '/tmp/cache/'.uniqid(),
+            'auto_reload' => true
+        ));
+        $this->twig->addExtension(new \Twig_Extensions_Extension_I18n());
+
+        $this->loader = new PoFileLoader();
+    }
+
+    /**
+     * @dataProvider testExtractDataProvider
+     */
+    public function testExtract(array $templates, array $parameters, array $messages)
+    {
+        $extractor = new Extractor($this->twig);
+
+        foreach ($templates as $template) {
+            $extractor->addTemplate($template);
+        }
+        foreach ($parameters as $parameter) {
+            $extractor->addGettextParameter($parameter);
+        }
+
+        $extractor->extract();
+
+        $catalog = $this->loader->load($this->getPotFile(), null);
+
+        foreach ($messages as $message) {
+            $this->assertTrue(
+                $catalog->has($message),
+                sprintf('Message "%s" not found in catalog.', $message)
+            );
+        }
+    }
+
+    public function testExtractDataProvider()
+    {
+        return array(
+            array(
+                array(
+                    __DIR__.'/Fixtures/twig/singular.twig',
+                    __DIR__.'/Fixtures/twig/plural.twig',
+                ),
+                $this->getGettextParameters(),
+                array(
+                    'Hello %name%!',
+                    'Hello World!',
+                    'Hey %name%, I have one apple.',
+                    'Hey %name%, I have %count% apples.',
+                ),
+            ),
+        );
+    }
+
+    public function testExtractNoTranslations()
+    {
+        $extractor = new Extractor($this->twig);
+
+        $extractor->addTemplate(__DIR__.'/Fixtures/twig/empty.twig');
+        $extractor->setGettextParameters($this->getGettextParameters());
+
+        $extractor->extract();
+
+        $catalog = $this->loader->load($this->getPotFile(), null);
+
+        $this->assertEmpty($catalog->all('messages'));
+    }
+
+    private function getPotFile()
+    {
+        return __DIR__.'/Fixtures/messages.pot';
+    }
+
+    private function getGettextParameters()
+    {
+        return array(
+            '--force-po',
+            '-o',
+            $this->getPotFile(),
+        );
+    }
+
+    protected function tearDown()
+    {
+        if (file_exists($this->getPotFile())) {
+            unlink($this->getPotFile());
+        }
+    }
+}
diff --git a/inc/Twig/Gettext/Test/Fixtures/twig/empty.twig b/inc/Twig/Gettext/Test/Fixtures/twig/empty.twig
new file mode 100644
index 00000000..05f0d26a
--- /dev/null
+++ b/inc/Twig/Gettext/Test/Fixtures/twig/empty.twig
@@ -0,0 +1 @@
+Nothing to translate here.
diff --git a/inc/Twig/Gettext/Test/Fixtures/twig/plural.twig b/inc/Twig/Gettext/Test/Fixtures/twig/plural.twig
new file mode 100644
index 00000000..f9754ff4
--- /dev/null
+++ b/inc/Twig/Gettext/Test/Fixtures/twig/plural.twig
@@ -0,0 +1,5 @@
+{% trans %}
+    Hey {{ name }}, I have one apple.
+{% plural apple_count %}
+    Hey {{ name }}, I have {{ count }} apples.
+{% endtrans %}
diff --git a/inc/Twig/Gettext/Test/Fixtures/twig/singular.twig b/inc/Twig/Gettext/Test/Fixtures/twig/singular.twig
new file mode 100644
index 00000000..d757cf90
--- /dev/null
+++ b/inc/Twig/Gettext/Test/Fixtures/twig/singular.twig
@@ -0,0 +1,9 @@
+{% trans "Hello World!" %}
+
+{% trans %}
+    Hello World!
+{% endtrans %}
+
+{% trans %}
+    Hello {{ name }}!
+{% endtrans %}
diff --git a/inc/Twig/Lexer.php b/inc/Twig/Lexer.php
new file mode 100644
index 00000000..000b038e
--- /dev/null
+++ b/inc/Twig/Lexer.php
@@ -0,0 +1,408 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Lexes a template string.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Lexer implements Twig_LexerInterface
+{
+    protected $tokens;
+    protected $code;
+    protected $cursor;
+    protected $lineno;
+    protected $end;
+    protected $state;
+    protected $states;
+    protected $brackets;
+    protected $env;
+    protected $filename;
+    protected $options;
+    protected $regexes;
+    protected $position;
+    protected $positions;
+    protected $currentVarBlockLine;
+
+    const STATE_DATA            = 0;
+    const STATE_BLOCK           = 1;
+    const STATE_VAR             = 2;
+    const STATE_STRING          = 3;
+    const STATE_INTERPOLATION   = 4;
+
+    const REGEX_NAME            = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A';
+    const REGEX_NUMBER          = '/[0-9]+(?:\.[0-9]+)?/A';
+    const REGEX_STRING          = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
+    const REGEX_DQ_STRING_DELIM = '/"/A';
+    const REGEX_DQ_STRING_PART  = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As';
+    const PUNCTUATION           = '()[]{}?:.,|';
+
+    public function __construct(Twig_Environment $env, array $options = array())
+    {
+        $this->env = $env;
+
+        $this->options = array_merge(array(
+            'tag_comment'     => array('{#', '#}'),
+            'tag_block'       => array('{%', '%}'),
+            'tag_variable'    => array('{{', '}}'),
+            'whitespace_trim' => '-',
+            'interpolation'   => array('#{', '}'),
+        ), $options);
+
+        $this->regexes = array(
+            'lex_var'             => '/\s*'.preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_variable'][1], '/').'/A',
+            'lex_block'           => '/\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')\n?/A',
+            'lex_raw_data'        => '/('.preg_quote($this->options['tag_block'][0].$this->options['whitespace_trim'], '/').'|'.preg_quote($this->options['tag_block'][0], '/').')\s*(?:end%s)\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/s',
+            'operator'            => $this->getOperatorRegex(),
+            'lex_comment'         => '/(?:'.preg_quote($this->options['whitespace_trim'], '/').preg_quote($this->options['tag_comment'][1], '/').'\s*|'.preg_quote($this->options['tag_comment'][1], '/').')\n?/s',
+            'lex_block_raw'       => '/\s*(raw|verbatim)\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/As',
+            'lex_block_line'      => '/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As',
+            'lex_tokens_start'    => '/('.preg_quote($this->options['tag_variable'][0], '/').'|'.preg_quote($this->options['tag_block'][0], '/').'|'.preg_quote($this->options['tag_comment'][0], '/').')('.preg_quote($this->options['whitespace_trim'], '/').')?/s',
+            'interpolation_start' => '/'.preg_quote($this->options['interpolation'][0], '/').'\s*/A',
+            'interpolation_end'   => '/\s*'.preg_quote($this->options['interpolation'][1], '/').'/A',
+        );
+    }
+
+    /**
+     * Tokenizes a source code.
+     *
+     * @param string $code     The source code
+     * @param string $filename A unique identifier for the source code
+     *
+     * @return Twig_TokenStream A token stream instance
+     */
+    public function tokenize($code, $filename = null)
+    {
+        if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) {
+            $mbEncoding = mb_internal_encoding();
+            mb_internal_encoding('ASCII');
+        }
+
+        $this->code = str_replace(array("\r\n", "\r"), "\n", $code);
+        $this->filename = $filename;
+        $this->cursor = 0;
+        $this->lineno = 1;
+        $this->end = strlen($this->code);
+        $this->tokens = array();
+        $this->state = self::STATE_DATA;
+        $this->states = array();
+        $this->brackets = array();
+        $this->position = -1;
+
+        // find all token starts in one go
+        preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, PREG_OFFSET_CAPTURE);
+        $this->positions = $matches;
+
+        while ($this->cursor < $this->end) {
+            // dispatch to the lexing functions depending
+            // on the current state
+            switch ($this->state) {
+                case self::STATE_DATA:
+                    $this->lexData();
+                    break;
+
+                case self::STATE_BLOCK:
+                    $this->lexBlock();
+                    break;
+
+                case self::STATE_VAR:
+                    $this->lexVar();
+                    break;
+
+                case self::STATE_STRING:
+                    $this->lexString();
+                    break;
+
+                case self::STATE_INTERPOLATION:
+                    $this->lexInterpolation();
+                    break;
+            }
+        }
+
+        $this->pushToken(Twig_Token::EOF_TYPE);
+
+        if (!empty($this->brackets)) {
+            list($expect, $lineno) = array_pop($this->brackets);
+            throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
+        }
+
+        if (isset($mbEncoding)) {
+            mb_internal_encoding($mbEncoding);
+        }
+
+        return new Twig_TokenStream($this->tokens, $this->filename);
+    }
+
+    protected function lexData()
+    {
+        // if no matches are left we return the rest of the template as simple text token
+        if ($this->position == count($this->positions[0]) - 1) {
+            $this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor));
+            $this->cursor = $this->end;
+
+            return;
+        }
+
+        // Find the first token after the current cursor
+        $position = $this->positions[0][++$this->position];
+        while ($position[1] < $this->cursor) {
+            if ($this->position == count($this->positions[0]) - 1) {
+                return;
+            }
+            $position = $this->positions[0][++$this->position];
+        }
+
+        // push the template text first
+        $text = $textContent = substr($this->code, $this->cursor, $position[1] - $this->cursor);
+        if (isset($this->positions[2][$this->position][0])) {
+            $text = rtrim($text);
+        }
+        $this->pushToken(Twig_Token::TEXT_TYPE, $text);
+        $this->moveCursor($textContent.$position[0]);
+
+        switch ($this->positions[1][$this->position][0]) {
+            case $this->options['tag_comment'][0]:
+                $this->lexComment();
+                break;
+
+            case $this->options['tag_block'][0]:
+                // raw data?
+                if (preg_match($this->regexes['lex_block_raw'], $this->code, $match, null, $this->cursor)) {
+                    $this->moveCursor($match[0]);
+                    $this->lexRawData($match[1]);
+                // {% line \d+ %}
+                } elseif (preg_match($this->regexes['lex_block_line'], $this->code, $match, null, $this->cursor)) {
+                    $this->moveCursor($match[0]);
+                    $this->lineno = (int) $match[1];
+                } else {
+                    $this->pushToken(Twig_Token::BLOCK_START_TYPE);
+                    $this->pushState(self::STATE_BLOCK);
+                    $this->currentVarBlockLine = $this->lineno;
+                }
+                break;
+
+            case $this->options['tag_variable'][0]:
+                $this->pushToken(Twig_Token::VAR_START_TYPE);
+                $this->pushState(self::STATE_VAR);
+                $this->currentVarBlockLine = $this->lineno;
+                break;
+        }
+    }
+
+    protected function lexBlock()
+    {
+        if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::BLOCK_END_TYPE);
+            $this->moveCursor($match[0]);
+            $this->popState();
+        } else {
+            $this->lexExpression();
+        }
+    }
+
+    protected function lexVar()
+    {
+        if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::VAR_END_TYPE);
+            $this->moveCursor($match[0]);
+            $this->popState();
+        } else {
+            $this->lexExpression();
+        }
+    }
+
+    protected function lexExpression()
+    {
+        // whitespace
+        if (preg_match('/\s+/A', $this->code, $match, null, $this->cursor)) {
+            $this->moveCursor($match[0]);
+
+            if ($this->cursor >= $this->end) {
+                throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $this->state === self::STATE_BLOCK ? 'block' : 'variable'), $this->currentVarBlockLine, $this->filename);
+            }
+        }
+
+        // operators
+        if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::OPERATOR_TYPE, $match[0]);
+            $this->moveCursor($match[0]);
+        }
+        // names
+        elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::NAME_TYPE, $match[0]);
+            $this->moveCursor($match[0]);
+        }
+        // numbers
+        elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) {
+            $number = (float) $match[0];  // floats
+            if (ctype_digit($match[0]) && $number <= PHP_INT_MAX) {
+                $number = (int) $match[0]; // integers lower than the maximum
+            }
+            $this->pushToken(Twig_Token::NUMBER_TYPE, $number);
+            $this->moveCursor($match[0]);
+        }
+        // punctuation
+        elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) {
+            // opening bracket
+            if (false !== strpos('([{', $this->code[$this->cursor])) {
+                $this->brackets[] = array($this->code[$this->cursor], $this->lineno);
+            }
+            // closing bracket
+            elseif (false !== strpos(')]}', $this->code[$this->cursor])) {
+                if (empty($this->brackets)) {
+                    throw new Twig_Error_Syntax(sprintf('Unexpected "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
+                }
+
+                list($expect, $lineno) = array_pop($this->brackets);
+                if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) {
+                    throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
+                }
+            }
+
+            $this->pushToken(Twig_Token::PUNCTUATION_TYPE, $this->code[$this->cursor]);
+            ++$this->cursor;
+        }
+        // strings
+        elseif (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) {
+            $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)));
+            $this->moveCursor($match[0]);
+        }
+        // opening double quoted string
+        elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
+            $this->brackets[] = array('"', $this->lineno);
+            $this->pushState(self::STATE_STRING);
+            $this->moveCursor($match[0]);
+        }
+        // unlexable
+        else {
+            throw new Twig_Error_Syntax(sprintf('Unexpected character "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename);
+        }
+    }
+
+    protected function lexRawData($tag)
+    {
+        if (!preg_match(str_replace('%s', $tag, $this->regexes['lex_raw_data']), $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+            throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "%s" block', $tag), $this->lineno, $this->filename);
+        }
+
+        $text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor);
+        $this->moveCursor($text.$match[0][0]);
+
+        if (false !== strpos($match[1][0], $this->options['whitespace_trim'])) {
+            $text = rtrim($text);
+        }
+
+        $this->pushToken(Twig_Token::TEXT_TYPE, $text);
+    }
+
+    protected function lexComment()
+    {
+        if (!preg_match($this->regexes['lex_comment'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
+            throw new Twig_Error_Syntax('Unclosed comment', $this->lineno, $this->filename);
+        }
+
+        $this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]);
+    }
+
+    protected function lexString()
+    {
+        if (preg_match($this->regexes['interpolation_start'], $this->code, $match, null, $this->cursor)) {
+            $this->brackets[] = array($this->options['interpolation'][0], $this->lineno);
+            $this->pushToken(Twig_Token::INTERPOLATION_START_TYPE);
+            $this->moveCursor($match[0]);
+            $this->pushState(self::STATE_INTERPOLATION);
+
+        } elseif (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, null, $this->cursor) && strlen($match[0]) > 0) {
+            $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes($match[0]));
+            $this->moveCursor($match[0]);
+
+        } elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
+
+            list($expect, $lineno) = array_pop($this->brackets);
+            if ($this->code[$this->cursor] != '"') {
+                throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename);
+            }
+
+            $this->popState();
+            ++$this->cursor;
+        }
+    }
+
+    protected function lexInterpolation()
+    {
+        $bracket = end($this->brackets);
+        if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, null, $this->cursor)) {
+            array_pop($this->brackets);
+            $this->pushToken(Twig_Token::INTERPOLATION_END_TYPE);
+            $this->moveCursor($match[0]);
+            $this->popState();
+        } else {
+            $this->lexExpression();
+        }
+    }
+
+    protected function pushToken($type, $value = '')
+    {
+        // do not push empty text tokens
+        if (Twig_Token::TEXT_TYPE === $type && '' === $value) {
+            return;
+        }
+
+        $this->tokens[] = new Twig_Token($type, $value, $this->lineno);
+    }
+
+    protected function moveCursor($text)
+    {
+        $this->cursor += strlen($text);
+        $this->lineno += substr_count($text, "\n");
+    }
+
+    protected function getOperatorRegex()
+    {
+        $operators = array_merge(
+            array('='),
+            array_keys($this->env->getUnaryOperators()),
+            array_keys($this->env->getBinaryOperators())
+        );
+
+        $operators = array_combine($operators, array_map('strlen', $operators));
+        arsort($operators);
+
+        $regex = array();
+        foreach ($operators as $operator => $length) {
+            // an operator that ends with a character must be followed by
+            // a whitespace or a parenthesis
+            if (ctype_alpha($operator[$length - 1])) {
+                $regex[] = preg_quote($operator, '/').'(?=[\s()])';
+            } else {
+                $regex[] = preg_quote($operator, '/');
+            }
+        }
+
+        return '/'.implode('|', $regex).'/A';
+    }
+
+    protected function pushState($state)
+    {
+        $this->states[] = $this->state;
+        $this->state = $state;
+    }
+
+    protected function popState()
+    {
+        if (0 === count($this->states)) {
+            throw new Exception('Cannot pop state without a previous state');
+        }
+
+        $this->state = array_pop($this->states);
+    }
+}
diff --git a/inc/Twig/LexerInterface.php b/inc/Twig/LexerInterface.php
new file mode 100644
index 00000000..4b83f81b
--- /dev/null
+++ b/inc/Twig/LexerInterface.php
@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by lexer classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_LexerInterface
+{
+    /**
+     * Tokenizes a source code.
+     *
+     * @param string $code     The source code
+     * @param string $filename A unique identifier for the source code
+     *
+     * @return Twig_TokenStream A token stream instance
+     */
+    public function tokenize($code, $filename = null);
+}
diff --git a/inc/Twig/Loader/Array.php b/inc/Twig/Loader/Array.php
new file mode 100644
index 00000000..89087aea
--- /dev/null
+++ b/inc/Twig/Loader/Array.php
@@ -0,0 +1,98 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads a template from an array.
+ *
+ * When using this loader with a cache mechanism, you should know that a new cache
+ * key is generated each time a template content "changes" (the cache key being the
+ * source code of the template). If you don't want to see your cache grows out of
+ * control, you need to take care of clearing the old cache file by yourself.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Loader_Array implements Twig_LoaderInterface, Twig_ExistsLoaderInterface
+{
+    protected $templates;
+
+    /**
+     * Constructor.
+     *
+     * @param array $templates An array of templates (keys are the names, and values are the source code)
+     *
+     * @see Twig_Loader
+     */
+    public function __construct(array $templates)
+    {
+        $this->templates = array();
+        foreach ($templates as $name => $template) {
+            $this->templates[$name] = $template;
+        }
+    }
+
+    /**
+     * Adds or overrides a template.
+     *
+     * @param string $name     The template name
+     * @param string $template The template source
+     */
+    public function setTemplate($name, $template)
+    {
+        $this->templates[(string) $name] = $template;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSource($name)
+    {
+        $name = (string) $name;
+        if (!isset($this->templates[$name])) {
+            throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
+        }
+
+        return $this->templates[$name];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function exists($name)
+    {
+        return isset($this->templates[(string) $name]);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCacheKey($name)
+    {
+        $name = (string) $name;
+        if (!isset($this->templates[$name])) {
+            throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
+        }
+
+        return $this->templates[$name];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isFresh($name, $time)
+    {
+        $name = (string) $name;
+        if (!isset($this->templates[$name])) {
+            throw new Twig_Error_Loader(sprintf('Template "%s" is not defined.', $name));
+        }
+
+        return true;
+    }
+}
diff --git a/inc/Twig/Loader/Chain.php b/inc/Twig/Loader/Chain.php
new file mode 100644
index 00000000..1f1cf065
--- /dev/null
+++ b/inc/Twig/Loader/Chain.php
@@ -0,0 +1,139 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads templates from other loaders.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Loader_Chain implements Twig_LoaderInterface, Twig_ExistsLoaderInterface
+{
+    private $hasSourceCache = array();
+    protected $loaders;
+
+    /**
+     * Constructor.
+     *
+     * @param Twig_LoaderInterface[] $loaders An array of loader instances
+     */
+    public function __construct(array $loaders = array())
+    {
+        $this->loaders = array();
+        foreach ($loaders as $loader) {
+            $this->addLoader($loader);
+        }
+    }
+
+    /**
+     * Adds a loader instance.
+     *
+     * @param Twig_LoaderInterface $loader A Loader instance
+     */
+    public function addLoader(Twig_LoaderInterface $loader)
+    {
+        $this->loaders[] = $loader;
+        $this->hasSourceCache = array();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSource($name)
+    {
+        $exceptions = array();
+        foreach ($this->loaders as $loader) {
+            if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+                continue;
+            }
+
+            try {
+                return $loader->getSource($name);
+            } catch (Twig_Error_Loader $e) {
+                $exceptions[] = $e->getMessage();
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Template "%s" is not defined (%s).', $name, implode(', ', $exceptions)));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function exists($name)
+    {
+        $name = (string) $name;
+
+        if (isset($this->hasSourceCache[$name])) {
+            return $this->hasSourceCache[$name];
+        }
+
+        foreach ($this->loaders as $loader) {
+            if ($loader instanceof Twig_ExistsLoaderInterface) {
+                if ($loader->exists($name)) {
+                    return $this->hasSourceCache[$name] = true;
+                }
+
+                continue;
+            }
+
+            try {
+                $loader->getSource($name);
+
+                return $this->hasSourceCache[$name] = true;
+            } catch (Twig_Error_Loader $e) {
+            }
+        }
+
+        return $this->hasSourceCache[$name] = false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCacheKey($name)
+    {
+        $exceptions = array();
+        foreach ($this->loaders as $loader) {
+            if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+                continue;
+            }
+
+            try {
+                return $loader->getCacheKey($name);
+            } catch (Twig_Error_Loader $e) {
+                $exceptions[] = get_class($loader).': '.$e->getMessage();
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Template "%s" is not defined (%s).', $name, implode(' ', $exceptions)));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isFresh($name, $time)
+    {
+        $exceptions = array();
+        foreach ($this->loaders as $loader) {
+            if ($loader instanceof Twig_ExistsLoaderInterface && !$loader->exists($name)) {
+                continue;
+            }
+
+            try {
+                return $loader->isFresh($name, $time);
+            } catch (Twig_Error_Loader $e) {
+                $exceptions[] = get_class($loader).': '.$e->getMessage();
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Template "%s" is not defined (%s).', $name, implode(' ', $exceptions)));
+    }
+}
diff --git a/inc/Twig/Loader/Filesystem.php b/inc/Twig/Loader/Filesystem.php
new file mode 100644
index 00000000..f9211cbd
--- /dev/null
+++ b/inc/Twig/Loader/Filesystem.php
@@ -0,0 +1,223 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads template from the filesystem.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Loader_Filesystem implements Twig_LoaderInterface, Twig_ExistsLoaderInterface
+{
+    protected $paths;
+    protected $cache;
+
+    /**
+     * Constructor.
+     *
+     * @param string|array $paths A path or an array of paths where to look for templates
+     */
+    public function __construct($paths = array())
+    {
+        if ($paths) {
+            $this->setPaths($paths);
+        }
+    }
+
+    /**
+     * Returns the paths to the templates.
+     *
+     * @param string $namespace A path namespace
+     *
+     * @return array The array of paths where to look for templates
+     */
+    public function getPaths($namespace = '__main__')
+    {
+        return isset($this->paths[$namespace]) ? $this->paths[$namespace] : array();
+    }
+
+    /**
+     * Returns the path namespaces.
+     *
+     * The "__main__" namespace is always defined.
+     *
+     * @return array The array of defined namespaces
+     */
+    public function getNamespaces()
+    {
+        return array_keys($this->paths);
+    }
+
+    /**
+     * Sets the paths where templates are stored.
+     *
+     * @param string|array $paths     A path or an array of paths where to look for templates
+     * @param string       $namespace A path namespace
+     */
+    public function setPaths($paths, $namespace = '__main__')
+    {
+        if (!is_array($paths)) {
+            $paths = array($paths);
+        }
+
+        $this->paths[$namespace] = array();
+        foreach ($paths as $path) {
+            $this->addPath($path, $namespace);
+        }
+    }
+
+    /**
+     * Adds a path where templates are stored.
+     *
+     * @param string $path      A path where to look for templates
+     * @param string $namespace A path name
+     *
+     * @throws Twig_Error_Loader
+     */
+    public function addPath($path, $namespace = '__main__')
+    {
+        // invalidate the cache
+        $this->cache = array();
+
+        if (!is_dir($path)) {
+            throw new Twig_Error_Loader(sprintf('The "%s" directory does not exist.', $path));
+        }
+
+        $this->paths[$namespace][] = rtrim($path, '/\\');
+    }
+
+    /**
+     * Prepends a path where templates are stored.
+     *
+     * @param string $path      A path where to look for templates
+     * @param string $namespace A path name
+     *
+     * @throws Twig_Error_Loader
+     */
+    public function prependPath($path, $namespace = '__main__')
+    {
+        // invalidate the cache
+        $this->cache = array();
+
+        if (!is_dir($path)) {
+            throw new Twig_Error_Loader(sprintf('The "%s" directory does not exist.', $path));
+        }
+
+        $path = rtrim($path, '/\\');
+
+        if (!isset($this->paths[$namespace])) {
+            $this->paths[$namespace][] = $path;
+        } else {
+            array_unshift($this->paths[$namespace], $path);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getSource($name)
+    {
+        return file_get_contents($this->findTemplate($name));
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCacheKey($name)
+    {
+        return $this->findTemplate($name);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function exists($name)
+    {
+        $name = (string) $name;
+        if (isset($this->cache[$name])) {
+            return true;
+        }
+
+        try {
+            $this->findTemplate($name);
+
+            return true;
+        } catch (Twig_Error_Loader $exception) {
+            return false;
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isFresh($name, $time)
+    {
+        return filemtime($this->findTemplate($name)) <= $time;
+    }
+
+    protected function findTemplate($name)
+    {
+        $name = (string) $name;
+
+        // normalize name
+        $name = preg_replace('#/{2,}#', '/', strtr($name, '\\', '/'));
+
+        if (isset($this->cache[$name])) {
+            return $this->cache[$name];
+        }
+
+        $this->validateName($name);
+
+        $namespace = '__main__';
+        if (isset($name[0]) && '@' == $name[0]) {
+            if (false === $pos = strpos($name, '/')) {
+                throw new Twig_Error_Loader(sprintf('Malformed namespaced template name "%s" (expecting "@namespace/template_name").', $name));
+            }
+
+            $namespace = substr($name, 1, $pos - 1);
+
+            $name = substr($name, $pos + 1);
+        }
+
+        if (!isset($this->paths[$namespace])) {
+            throw new Twig_Error_Loader(sprintf('There are no registered paths for namespace "%s".', $namespace));
+        }
+
+        foreach ($this->paths[$namespace] as $path) {
+            if (is_file($path.'/'.$name)) {
+                return $this->cache[$name] = $path.'/'.$name;
+            }
+        }
+
+        throw new Twig_Error_Loader(sprintf('Unable to find template "%s" (looked into: %s).', $name, implode(', ', $this->paths[$namespace])));
+    }
+
+    protected function validateName($name)
+    {
+        if (false !== strpos($name, "\0")) {
+            throw new Twig_Error_Loader('A template name cannot contain NUL bytes.');
+        }
+
+        $name = ltrim($name, '/');
+        $parts = explode('/', $name);
+        $level = 0;
+        foreach ($parts as $part) {
+            if ('..' === $part) {
+                --$level;
+            } elseif ('.' !== $part) {
+                ++$level;
+            }
+
+            if ($level < 0) {
+                throw new Twig_Error_Loader(sprintf('Looks like you try to load a template outside configured directories (%s).', $name));
+            }
+        }
+    }
+}
diff --git a/inc/Twig/Loader/String.php b/inc/Twig/Loader/String.php
new file mode 100644
index 00000000..8ad9856c
--- /dev/null
+++ b/inc/Twig/Loader/String.php
@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loads a template from a string.
+ *
+ * This loader should only be used for unit testing as it has many limitations
+ * (for instance, the include or extends tag does not make any sense for a string
+ * loader).
+ *
+ * When using this loader with a cache mechanism, you should know that a new cache
+ * key is generated each time a template content "changes" (the cache key being the
+ * source code of the template). If you don't want to see your cache grows out of
+ * control, you need to take care of clearing the old cache file by yourself.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Loader_String implements Twig_LoaderInterface, Twig_ExistsLoaderInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getSource($name)
+    {
+        return $name;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function exists($name)
+    {
+        return true;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getCacheKey($name)
+    {
+        return $name;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function isFresh($name, $time)
+    {
+        return true;
+    }
+}
diff --git a/inc/Twig/LoaderInterface.php b/inc/Twig/LoaderInterface.php
new file mode 100644
index 00000000..927786d1
--- /dev/null
+++ b/inc/Twig/LoaderInterface.php
@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface all loaders must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_LoaderInterface
+{
+    /**
+     * Gets the source code of a template, given its name.
+     *
+     * @param string $name The name of the template to load
+     *
+     * @return string The template source code
+     *
+     * @throws Twig_Error_Loader When $name is not found
+     */
+    public function getSource($name);
+
+    /**
+     * Gets the cache key to use for the cache for a given template name.
+     *
+     * @param string $name The name of the template to load
+     *
+     * @return string The cache key
+     *
+     * @throws Twig_Error_Loader When $name is not found
+     */
+    public function getCacheKey($name);
+
+    /**
+     * Returns true if the template is still fresh.
+     *
+     * @param string    $name The template name
+     * @param timestamp $time The last modification time of the cached template
+     *
+     * @return Boolean true if the template is fresh, false otherwise
+     *
+     * @throws Twig_Error_Loader When $name is not found
+     */
+    public function isFresh($name, $time);
+}
diff --git a/inc/Twig/Markup.php b/inc/Twig/Markup.php
new file mode 100644
index 00000000..69871fcb
--- /dev/null
+++ b/inc/Twig/Markup.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Marks a content as safe.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Markup implements Countable
+{
+    protected $content;
+    protected $charset;
+
+    public function __construct($content, $charset)
+    {
+        $this->content = (string) $content;
+        $this->charset = $charset;
+    }
+
+    public function __toString()
+    {
+        return $this->content;
+    }
+
+    public function count()
+    {
+        return function_exists('mb_get_info') ? mb_strlen($this->content, $this->charset) : strlen($this->content);
+    }
+}
diff --git a/inc/Twig/Node.php b/inc/Twig/Node.php
new file mode 100644
index 00000000..931b4635
--- /dev/null
+++ b/inc/Twig/Node.php
@@ -0,0 +1,226 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a node in the AST.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node implements Twig_NodeInterface
+{
+    protected $nodes;
+    protected $attributes;
+    protected $lineno;
+    protected $tag;
+
+    /**
+     * Constructor.
+     *
+     * The nodes are automatically made available as properties ($this->node).
+     * The attributes are automatically made available as array items ($this['name']).
+     *
+     * @param array   $nodes      An array of named nodes
+     * @param array   $attributes An array of attributes (should not be nodes)
+     * @param integer $lineno     The line number
+     * @param string  $tag        The tag name associated with the Node
+     */
+    public function __construct(array $nodes = array(), array $attributes = array(), $lineno = 0, $tag = null)
+    {
+        $this->nodes = $nodes;
+        $this->attributes = $attributes;
+        $this->lineno = $lineno;
+        $this->tag = $tag;
+    }
+
+    public function __toString()
+    {
+        $attributes = array();
+        foreach ($this->attributes as $name => $value) {
+            $attributes[] = sprintf('%s: %s', $name, str_replace("\n", '', var_export($value, true)));
+        }
+
+        $repr = array(get_class($this).'('.implode(', ', $attributes));
+
+        if (count($this->nodes)) {
+            foreach ($this->nodes as $name => $node) {
+                $len = strlen($name) + 4;
+                $noderepr = array();
+                foreach (explode("\n", (string) $node) as $line) {
+                    $noderepr[] = str_repeat(' ', $len).$line;
+                }
+
+                $repr[] = sprintf('  %s: %s', $name, ltrim(implode("\n", $noderepr)));
+            }
+
+            $repr[] = ')';
+        } else {
+            $repr[0] .= ')';
+        }
+
+        return implode("\n", $repr);
+    }
+
+    public function toXml($asDom = false)
+    {
+        $dom = new DOMDocument('1.0', 'UTF-8');
+        $dom->formatOutput = true;
+        $dom->appendChild($xml = $dom->createElement('twig'));
+
+        $xml->appendChild($node = $dom->createElement('node'));
+        $node->setAttribute('class', get_class($this));
+
+        foreach ($this->attributes as $name => $value) {
+            $node->appendChild($attribute = $dom->createElement('attribute'));
+            $attribute->setAttribute('name', $name);
+            $attribute->appendChild($dom->createTextNode($value));
+        }
+
+        foreach ($this->nodes as $name => $n) {
+            if (null === $n) {
+                continue;
+            }
+
+            $child = $n->toXml(true)->getElementsByTagName('node')->item(0);
+            $child = $dom->importNode($child, true);
+            $child->setAttribute('name', $name);
+
+            $node->appendChild($child);
+        }
+
+        return $asDom ? $dom : $dom->saveXml();
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        foreach ($this->nodes as $node) {
+            $node->compile($compiler);
+        }
+    }
+
+    public function getLine()
+    {
+        return $this->lineno;
+    }
+
+    public function getNodeTag()
+    {
+        return $this->tag;
+    }
+
+    /**
+     * Returns true if the attribute is defined.
+     *
+     * @param  string  The attribute name
+     *
+     * @return Boolean true if the attribute is defined, false otherwise
+     */
+    public function hasAttribute($name)
+    {
+        return array_key_exists($name, $this->attributes);
+    }
+
+    /**
+     * Gets an attribute.
+     *
+     * @param  string The attribute name
+     *
+     * @return mixed The attribute value
+     */
+    public function getAttribute($name)
+    {
+        if (!array_key_exists($name, $this->attributes)) {
+            throw new LogicException(sprintf('Attribute "%s" does not exist for Node "%s".', $name, get_class($this)));
+        }
+
+        return $this->attributes[$name];
+    }
+
+    /**
+     * Sets an attribute.
+     *
+     * @param string The attribute name
+     * @param mixed  The attribute value
+     */
+    public function setAttribute($name, $value)
+    {
+        $this->attributes[$name] = $value;
+    }
+
+    /**
+     * Removes an attribute.
+     *
+     * @param string The attribute name
+     */
+    public function removeAttribute($name)
+    {
+        unset($this->attributes[$name]);
+    }
+
+    /**
+     * Returns true if the node with the given identifier exists.
+     *
+     * @param  string  The node name
+     *
+     * @return Boolean true if the node with the given name exists, false otherwise
+     */
+    public function hasNode($name)
+    {
+        return array_key_exists($name, $this->nodes);
+    }
+
+    /**
+     * Gets a node by name.
+     *
+     * @param  string The node name
+     *
+     * @return Twig_Node A Twig_Node instance
+     */
+    public function getNode($name)
+    {
+        if (!array_key_exists($name, $this->nodes)) {
+            throw new LogicException(sprintf('Node "%s" does not exist for Node "%s".', $name, get_class($this)));
+        }
+
+        return $this->nodes[$name];
+    }
+
+    /**
+     * Sets a node.
+     *
+     * @param string    The node name
+     * @param Twig_Node A Twig_Node instance
+     */
+    public function setNode($name, $node = null)
+    {
+        $this->nodes[$name] = $node;
+    }
+
+    /**
+     * Removes a node by name.
+     *
+     * @param string The node name
+     */
+    public function removeNode($name)
+    {
+        unset($this->nodes[$name]);
+    }
+
+    public function count()
+    {
+        return count($this->nodes);
+    }
+
+    public function getIterator()
+    {
+        return new ArrayIterator($this->nodes);
+    }
+}
diff --git a/inc/Twig/Node/AutoEscape.php b/inc/Twig/Node/AutoEscape.php
new file mode 100644
index 00000000..8f190e0b
--- /dev/null
+++ b/inc/Twig/Node/AutoEscape.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an autoescape node.
+ *
+ * The value is the escaping strategy (can be html, js, ...)
+ *
+ * The true value is equivalent to html.
+ *
+ * If autoescaping is disabled, then the value is false.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_AutoEscape extends Twig_Node
+{
+    public function __construct($value, Twig_NodeInterface $body, $lineno, $tag = 'autoescape')
+    {
+        parent::__construct(array('body' => $body), array('value' => $value), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('body'));
+    }
+}
diff --git a/inc/Twig/Node/Block.php b/inc/Twig/Node/Block.php
new file mode 100644
index 00000000..50eb67ed
--- /dev/null
+++ b/inc/Twig/Node/Block.php
@@ -0,0 +1,44 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a block node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Block extends Twig_Node
+{
+    public function __construct($name, Twig_NodeInterface $body, $lineno, $tag = null)
+    {
+        parent::__construct(array('body' => $body), array('name' => $name), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write(sprintf("public function block_%s(\$context, array \$blocks = array())\n", $this->getAttribute('name')), "{\n")
+            ->indent()
+        ;
+
+        $compiler
+            ->subcompile($this->getNode('body'))
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/BlockReference.php b/inc/Twig/Node/BlockReference.php
new file mode 100644
index 00000000..013e369e
--- /dev/null
+++ b/inc/Twig/Node/BlockReference.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a block call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_BlockReference extends Twig_Node implements Twig_NodeOutputInterface
+{
+    public function __construct($name, $lineno, $tag = null)
+    {
+        parent::__construct(array(), array('name' => $name), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write(sprintf("\$this->displayBlock('%s', \$context, \$blocks);\n", $this->getAttribute('name')))
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Body.php b/inc/Twig/Node/Body.php
new file mode 100644
index 00000000..3ffb1342
--- /dev/null
+++ b/inc/Twig/Node/Body.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a body node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Body extends Twig_Node
+{
+}
diff --git a/inc/Twig/Node/Do.php b/inc/Twig/Node/Do.php
new file mode 100644
index 00000000..c528066b
--- /dev/null
+++ b/inc/Twig/Node/Do.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a do node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Do extends Twig_Node
+{
+    public function __construct(Twig_Node_Expression $expr, $lineno, $tag = null)
+    {
+        parent::__construct(array('expr' => $expr), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write('')
+            ->subcompile($this->getNode('expr'))
+            ->raw(";\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Embed.php b/inc/Twig/Node/Embed.php
new file mode 100644
index 00000000..4c9456dc
--- /dev/null
+++ b/inc/Twig/Node/Embed.php
@@ -0,0 +1,38 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an embed node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Embed extends Twig_Node_Include
+{
+    // we don't inject the module to avoid node visitors to traverse it twice (as it will be already visited in the main module)
+    public function __construct($filename, $index, Twig_Node_Expression $variables = null, $only = false, $ignoreMissing = false, $lineno, $tag = null)
+    {
+        parent::__construct(new Twig_Node_Expression_Constant('not_used', $lineno), $variables, $only, $ignoreMissing, $lineno, $tag);
+
+        $this->setAttribute('filename', $filename);
+        $this->setAttribute('index', $index);
+    }
+
+    protected function addGetTemplate(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write("\$this->env->loadTemplate(")
+            ->string($this->getAttribute('filename'))
+            ->raw(', ')
+            ->string($this->getAttribute('index'))
+            ->raw(")")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression.php b/inc/Twig/Node/Expression.php
new file mode 100644
index 00000000..a7382e7d
--- /dev/null
+++ b/inc/Twig/Node/Expression.php
@@ -0,0 +1,20 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Abstract class for all nodes that represents an expression.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Twig_Node_Expression extends Twig_Node
+{
+}
diff --git a/inc/Twig/Node/Expression/Array.php b/inc/Twig/Node/Expression/Array.php
new file mode 100644
index 00000000..1da785fe
--- /dev/null
+++ b/inc/Twig/Node/Expression/Array.php
@@ -0,0 +1,86 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Array extends Twig_Node_Expression
+{
+    protected $index;
+
+    public function __construct(array $elements, $lineno)
+    {
+        parent::__construct($elements, array(), $lineno);
+
+        $this->index = -1;
+        foreach ($this->getKeyValuePairs() as $pair) {
+            if ($pair['key'] instanceof Twig_Node_Expression_Constant && ctype_digit((string) $pair['key']->getAttribute('value')) && $pair['key']->getAttribute('value') > $this->index) {
+                $this->index = $pair['key']->getAttribute('value');
+            }
+        }
+    }
+
+    public function getKeyValuePairs()
+    {
+        $pairs = array();
+
+        foreach (array_chunk($this->nodes, 2) as $pair) {
+            $pairs[] = array(
+                'key' => $pair[0],
+                'value' => $pair[1],
+            );
+        }
+
+        return $pairs;
+    }
+
+    public function hasElement(Twig_Node_Expression $key)
+    {
+        foreach ($this->getKeyValuePairs() as $pair) {
+            // we compare the string representation of the keys
+            // to avoid comparing the line numbers which are not relevant here.
+            if ((string) $key == (string) $pair['key']) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public function addElement(Twig_Node_Expression $value, Twig_Node_Expression $key = null)
+    {
+        if (null === $key) {
+            $key = new Twig_Node_Expression_Constant(++$this->index, $value->getLine());
+        }
+
+        array_push($this->nodes, $key, $value);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw('array(');
+        $first = true;
+        foreach ($this->getKeyValuePairs() as $pair) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $first = false;
+
+            $compiler
+                ->subcompile($pair['key'])
+                ->raw(' => ')
+                ->subcompile($pair['value'])
+            ;
+        }
+        $compiler->raw(')');
+    }
+}
diff --git a/inc/Twig/Node/Expression/AssignName.php b/inc/Twig/Node/Expression/AssignName.php
new file mode 100644
index 00000000..2ddea78c
--- /dev/null
+++ b/inc/Twig/Node/Expression/AssignName.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+class Twig_Node_Expression_AssignName extends Twig_Node_Expression_Name
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('$context[')
+            ->string($this->getAttribute('name'))
+            ->raw(']')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary.php b/inc/Twig/Node/Expression/Binary.php
new file mode 100644
index 00000000..9dd5de2c
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Node_Expression_Binary extends Twig_Node_Expression
+{
+    public function __construct(Twig_NodeInterface $left, Twig_NodeInterface $right, $lineno)
+    {
+        parent::__construct(array('left' => $left, 'right' => $right), array(), $lineno);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('left'))
+            ->raw(' ')
+        ;
+        $this->operator($compiler);
+        $compiler
+            ->raw(' ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    abstract public function operator(Twig_Compiler $compiler);
+}
diff --git a/inc/Twig/Node/Expression/Binary/Add.php b/inc/Twig/Node/Expression/Binary/Add.php
new file mode 100644
index 00000000..0ef8e117
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Add.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Add extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('+');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/And.php b/inc/Twig/Node/Expression/Binary/And.php
new file mode 100644
index 00000000..d5752ebb
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/And.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_And extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('&&');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/BitwiseAnd.php b/inc/Twig/Node/Expression/Binary/BitwiseAnd.php
new file mode 100644
index 00000000..9a46d845
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/BitwiseAnd.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_BitwiseAnd extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('&');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/BitwiseOr.php b/inc/Twig/Node/Expression/Binary/BitwiseOr.php
new file mode 100644
index 00000000..058a20bf
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/BitwiseOr.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_BitwiseOr extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('|');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/BitwiseXor.php b/inc/Twig/Node/Expression/Binary/BitwiseXor.php
new file mode 100644
index 00000000..f4da73d4
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/BitwiseXor.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_BitwiseXor extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('^');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Concat.php b/inc/Twig/Node/Expression/Binary/Concat.php
new file mode 100644
index 00000000..f9a64627
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Concat.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Concat extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('.');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Div.php b/inc/Twig/Node/Expression/Binary/Div.php
new file mode 100644
index 00000000..e0797a61
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Div.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Div extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('/');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Equal.php b/inc/Twig/Node/Expression/Binary/Equal.php
new file mode 100644
index 00000000..7b1236d0
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Equal.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Equal extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('==');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/FloorDiv.php b/inc/Twig/Node/Expression/Binary/FloorDiv.php
new file mode 100644
index 00000000..7fbd0556
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/FloorDiv.php
@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_FloorDiv extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw('intval(floor(');
+        parent::compile($compiler);
+        $compiler->raw('))');
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('/');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Greater.php b/inc/Twig/Node/Expression/Binary/Greater.php
new file mode 100644
index 00000000..a110bd92
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Greater.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Greater extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('>');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/GreaterEqual.php b/inc/Twig/Node/Expression/Binary/GreaterEqual.php
new file mode 100644
index 00000000..3754fed2
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/GreaterEqual.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_GreaterEqual extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('>=');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/In.php b/inc/Twig/Node/Expression/Binary/In.php
new file mode 100644
index 00000000..788f9377
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/In.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_In extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('twig_in_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('in');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Less.php b/inc/Twig/Node/Expression/Binary/Less.php
new file mode 100644
index 00000000..45fd3004
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Less.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Less extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('<');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/LessEqual.php b/inc/Twig/Node/Expression/Binary/LessEqual.php
new file mode 100644
index 00000000..e38e257c
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/LessEqual.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_LessEqual extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('<=');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Mod.php b/inc/Twig/Node/Expression/Binary/Mod.php
new file mode 100644
index 00000000..9924114f
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Mod.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Mod extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('%');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Mul.php b/inc/Twig/Node/Expression/Binary/Mul.php
new file mode 100644
index 00000000..c91529ca
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Mul.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Mul extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('*');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/NotEqual.php b/inc/Twig/Node/Expression/Binary/NotEqual.php
new file mode 100644
index 00000000..26867ba2
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/NotEqual.php
@@ -0,0 +1,17 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_NotEqual extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('!=');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/NotIn.php b/inc/Twig/Node/Expression/Binary/NotIn.php
new file mode 100644
index 00000000..f347b7b6
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/NotIn.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_NotIn extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('!twig_in_filter(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('not in');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Or.php b/inc/Twig/Node/Expression/Binary/Or.php
new file mode 100644
index 00000000..adba49c6
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Or.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Or extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('||');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Power.php b/inc/Twig/Node/Expression/Binary/Power.php
new file mode 100644
index 00000000..b2c59040
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Power.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Power extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('pow(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('**');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Range.php b/inc/Twig/Node/Expression/Binary/Range.php
new file mode 100644
index 00000000..bea4f2a6
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Range.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Range extends Twig_Node_Expression_Binary
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('range(')
+            ->subcompile($this->getNode('left'))
+            ->raw(', ')
+            ->subcompile($this->getNode('right'))
+            ->raw(')')
+        ;
+    }
+
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('..');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Binary/Sub.php b/inc/Twig/Node/Expression/Binary/Sub.php
new file mode 100644
index 00000000..d4463991
--- /dev/null
+++ b/inc/Twig/Node/Expression/Binary/Sub.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Binary_Sub extends Twig_Node_Expression_Binary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        return $compiler->raw('-');
+    }
+}
diff --git a/inc/Twig/Node/Expression/BlockReference.php b/inc/Twig/Node/Expression/BlockReference.php
new file mode 100644
index 00000000..647196eb
--- /dev/null
+++ b/inc/Twig/Node/Expression/BlockReference.php
@@ -0,0 +1,51 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a block call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_BlockReference extends Twig_Node_Expression
+{
+    public function __construct(Twig_NodeInterface $name, $asString = false, $lineno, $tag = null)
+    {
+        parent::__construct(array('name' => $name), array('as_string' => $asString, 'output' => false), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        if ($this->getAttribute('as_string')) {
+            $compiler->raw('(string) ');
+        }
+
+        if ($this->getAttribute('output')) {
+            $compiler
+                ->addDebugInfo($this)
+                ->write("\$this->displayBlock(")
+                ->subcompile($this->getNode('name'))
+                ->raw(", \$context, \$blocks);\n")
+            ;
+        } else {
+            $compiler
+                ->raw("\$this->renderBlock(")
+                ->subcompile($this->getNode('name'))
+                ->raw(", \$context, \$blocks)")
+            ;
+        }
+    }
+}
diff --git a/inc/Twig/Node/Expression/Call.php b/inc/Twig/Node/Expression/Call.php
new file mode 100644
index 00000000..87b62deb
--- /dev/null
+++ b/inc/Twig/Node/Expression/Call.php
@@ -0,0 +1,178 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Node_Expression_Call extends Twig_Node_Expression
+{
+    protected function compileCallable(Twig_Compiler $compiler)
+    {
+        $callable = $this->getAttribute('callable');
+
+        $closingParenthesis = false;
+        if ($callable) {
+            if (is_string($callable)) {
+                $compiler->raw($callable);
+            } elseif (is_array($callable) && $callable[0] instanceof Twig_ExtensionInterface) {
+                $compiler->raw(sprintf('$this->env->getExtension(\'%s\')->%s', $callable[0]->getName(), $callable[1]));
+            } else {
+                $type = ucfirst($this->getAttribute('type'));
+                $compiler->raw(sprintf('call_user_func_array($this->env->get%s(\'%s\')->getCallable(), array', $type, $this->getAttribute('name')));
+                $closingParenthesis = true;
+            }
+        } else {
+            $compiler->raw($this->getAttribute('thing')->compile());
+        }
+
+        $this->compileArguments($compiler);
+
+        if ($closingParenthesis) {
+            $compiler->raw(')');
+        }
+    }
+
+    protected function compileArguments(Twig_Compiler $compiler)
+    {
+        $compiler->raw('(');
+
+        $first = true;
+
+        if ($this->hasAttribute('needs_environment') && $this->getAttribute('needs_environment')) {
+            $compiler->raw('$this->env');
+            $first = false;
+        }
+
+        if ($this->hasAttribute('needs_context') && $this->getAttribute('needs_context')) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $compiler->raw('$context');
+            $first = false;
+        }
+
+        if ($this->hasAttribute('arguments')) {
+            foreach ($this->getAttribute('arguments') as $argument) {
+                if (!$first) {
+                    $compiler->raw(', ');
+                }
+                $compiler->string($argument);
+                $first = false;
+            }
+        }
+
+        if ($this->hasNode('node')) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $compiler->subcompile($this->getNode('node'));
+            $first = false;
+        }
+
+        if ($this->hasNode('arguments') && null !== $this->getNode('arguments')) {
+            $callable = $this->hasAttribute('callable') ? $this->getAttribute('callable') : null;
+
+            $arguments = $this->getArguments($callable, $this->getNode('arguments'));
+
+            foreach ($arguments as $node) {
+                if (!$first) {
+                    $compiler->raw(', ');
+                }
+                $compiler->subcompile($node);
+                $first = false;
+            }
+        }
+
+        $compiler->raw(')');
+    }
+
+    protected function getArguments($callable, $arguments)
+    {
+        $parameters = array();
+        $named = false;
+        foreach ($arguments as $name => $node) {
+            if (!is_int($name)) {
+                $named = true;
+                $name = $this->normalizeName($name);
+            } elseif ($named) {
+                throw new Twig_Error_Syntax(sprintf('Positional arguments cannot be used after named arguments for %s "%s".', $this->getAttribute('type'), $this->getAttribute('name')));
+            }
+
+            $parameters[$name] = $node;
+        }
+
+        if (!$named) {
+            return $parameters;
+        }
+
+        if (!$callable) {
+            throw new LogicException(sprintf('Named arguments are not supported for %s "%s".', $this->getAttribute('type'), $this->getAttribute('name')));
+        }
+
+        // manage named arguments
+        if (is_array($callable)) {
+            $r = new ReflectionMethod($callable[0], $callable[1]);
+        } elseif (is_object($callable) && !$callable instanceof Closure) {
+            $r = new ReflectionObject($callable);
+            $r = $r->getMethod('__invoke');
+        } else {
+            $r = new ReflectionFunction($callable);
+        }
+
+        $definition = $r->getParameters();
+        if ($this->hasNode('node')) {
+            array_shift($definition);
+        }
+        if ($this->hasAttribute('needs_environment') && $this->getAttribute('needs_environment')) {
+            array_shift($definition);
+        }
+        if ($this->hasAttribute('needs_context') && $this->getAttribute('needs_context')) {
+            array_shift($definition);
+        }
+        if ($this->hasAttribute('arguments') && null !== $this->getAttribute('arguments')) {
+            foreach ($this->getAttribute('arguments') as $argument) {
+                array_shift($definition);
+            }
+        }
+
+        $arguments = array();
+        $pos = 0;
+        foreach ($definition as $param) {
+            $name = $this->normalizeName($param->name);
+
+            if (array_key_exists($name, $parameters)) {
+                if (array_key_exists($pos, $parameters)) {
+                    throw new Twig_Error_Syntax(sprintf('Arguments "%s" is defined twice for %s "%s".', $name, $this->getAttribute('type'), $this->getAttribute('name')));
+                }
+
+                $arguments[] = $parameters[$name];
+                unset($parameters[$name]);
+            } elseif (array_key_exists($pos, $parameters)) {
+                $arguments[] = $parameters[$pos];
+                unset($parameters[$pos]);
+                ++$pos;
+            } elseif ($param->isDefaultValueAvailable()) {
+                $arguments[] = new Twig_Node_Expression_Constant($param->getDefaultValue(), -1);
+            } elseif ($param->isOptional()) {
+                break;
+            } else {
+                throw new Twig_Error_Syntax(sprintf('Value for argument "%s" is required for %s "%s".', $name, $this->getAttribute('type'), $this->getAttribute('name')));
+            }
+        }
+
+        foreach (array_keys($parameters) as $name) {
+            throw new Twig_Error_Syntax(sprintf('Unknown argument "%s" for %s "%s".', $name, $this->getAttribute('type'), $this->getAttribute('name')));
+        }
+
+        return $arguments;
+    }
+
+    protected function normalizeName($name)
+    {
+        return strtolower(preg_replace(array('/([A-Z]+)([A-Z][a-z])/', '/([a-z\d])([A-Z])/'), array('\\1_\\2', '\\1_\\2'), $name));
+    }
+}
diff --git a/inc/Twig/Node/Expression/Conditional.php b/inc/Twig/Node/Expression/Conditional.php
new file mode 100644
index 00000000..edcb1e2d
--- /dev/null
+++ b/inc/Twig/Node/Expression/Conditional.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Conditional extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node_Expression $expr1, Twig_Node_Expression $expr2, Twig_Node_Expression $expr3, $lineno)
+    {
+        parent::__construct(array('expr1' => $expr1, 'expr2' => $expr2, 'expr3' => $expr3), array(), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('((')
+            ->subcompile($this->getNode('expr1'))
+            ->raw(') ? (')
+            ->subcompile($this->getNode('expr2'))
+            ->raw(') : (')
+            ->subcompile($this->getNode('expr3'))
+            ->raw('))')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Constant.php b/inc/Twig/Node/Expression/Constant.php
new file mode 100644
index 00000000..a91dc698
--- /dev/null
+++ b/inc/Twig/Node/Expression/Constant.php
@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Constant extends Twig_Node_Expression
+{
+    public function __construct($value, $lineno)
+    {
+        parent::__construct(array(), array('value' => $value), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->repr($this->getAttribute('value'));
+    }
+}
diff --git a/inc/Twig/Node/Expression/ExtensionReference.php b/inc/Twig/Node/Expression/ExtensionReference.php
new file mode 100644
index 00000000..00ac6701
--- /dev/null
+++ b/inc/Twig/Node/Expression/ExtensionReference.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an extension call node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_ExtensionReference extends Twig_Node_Expression
+{
+    public function __construct($name, $lineno, $tag = null)
+    {
+        parent::__construct(array(), array('name' => $name), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw(sprintf("\$this->env->getExtension('%s')", $this->getAttribute('name')));
+    }
+}
diff --git a/inc/Twig/Node/Expression/Filter.php b/inc/Twig/Node/Expression/Filter.php
new file mode 100644
index 00000000..207b062a
--- /dev/null
+++ b/inc/Twig/Node/Expression/Filter.php
@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Filter extends Twig_Node_Expression_Call
+{
+    public function __construct(Twig_NodeInterface $node, Twig_Node_Expression_Constant $filterName, Twig_NodeInterface $arguments, $lineno, $tag = null)
+    {
+        parent::__construct(array('node' => $node, 'filter' => $filterName, 'arguments' => $arguments), array(), $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getNode('filter')->getAttribute('value');
+        $filter = $compiler->getEnvironment()->getFilter($name);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('type', 'filter');
+        $this->setAttribute('thing', $filter);
+        $this->setAttribute('needs_environment', $filter->needsEnvironment());
+        $this->setAttribute('needs_context', $filter->needsContext());
+        $this->setAttribute('arguments', $filter->getArguments());
+        if ($filter instanceof Twig_FilterCallableInterface || $filter instanceof Twig_SimpleFilter) {
+            $this->setAttribute('callable', $filter->getCallable());
+        }
+
+        $this->compileCallable($compiler);
+    }
+}
diff --git a/inc/Twig/Node/Expression/Filter/Default.php b/inc/Twig/Node/Expression/Filter/Default.php
new file mode 100644
index 00000000..1827c888
--- /dev/null
+++ b/inc/Twig/Node/Expression/Filter/Default.php
@@ -0,0 +1,43 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Returns the value or the default value when it is undefined or empty.
+ *
+ * <pre>
+ *  {{ var.foo|default('foo item on var is not defined') }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Filter_Default extends Twig_Node_Expression_Filter
+{
+    public function __construct(Twig_NodeInterface $node, Twig_Node_Expression_Constant $filterName, Twig_NodeInterface $arguments, $lineno, $tag = null)
+    {
+        $default = new Twig_Node_Expression_Filter($node, new Twig_Node_Expression_Constant('default', $node->getLine()), $arguments, $node->getLine());
+
+        if ('default' === $filterName->getAttribute('value') && ($node instanceof Twig_Node_Expression_Name || $node instanceof Twig_Node_Expression_GetAttr)) {
+            $test = new Twig_Node_Expression_Test_Defined(clone $node, 'defined', new Twig_Node(), $node->getLine());
+            $false = count($arguments) ? $arguments->getNode(0) : new Twig_Node_Expression_Constant('', $node->getLine());
+
+            $node = new Twig_Node_Expression_Conditional($test, $default, $false, $node->getLine());
+        } else {
+            $node = $default;
+        }
+
+        parent::__construct($node, $filterName, $arguments, $lineno, $tag);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('node'));
+    }
+}
diff --git a/inc/Twig/Node/Expression/Function.php b/inc/Twig/Node/Expression/Function.php
new file mode 100644
index 00000000..3e1f6b55
--- /dev/null
+++ b/inc/Twig/Node/Expression/Function.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Function extends Twig_Node_Expression_Call
+{
+    public function __construct($name, Twig_NodeInterface $arguments, $lineno)
+    {
+        parent::__construct(array('arguments' => $arguments), array('name' => $name), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+        $function = $compiler->getEnvironment()->getFunction($name);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('type', 'function');
+        $this->setAttribute('thing', $function);
+        $this->setAttribute('needs_environment', $function->needsEnvironment());
+        $this->setAttribute('needs_context', $function->needsContext());
+        $this->setAttribute('arguments', $function->getArguments());
+        if ($function instanceof Twig_FunctionCallableInterface || $function instanceof Twig_SimpleFunction) {
+            $this->setAttribute('callable', $function->getCallable());
+        }
+
+        $this->compileCallable($compiler);
+    }
+}
diff --git a/inc/Twig/Node/Expression/GetAttr.php b/inc/Twig/Node/Expression/GetAttr.php
new file mode 100644
index 00000000..81a9b137
--- /dev/null
+++ b/inc/Twig/Node/Expression/GetAttr.php
@@ -0,0 +1,53 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_GetAttr extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node_Expression $node, Twig_Node_Expression $attribute, Twig_Node_Expression_Array $arguments, $type, $lineno)
+    {
+        parent::__construct(array('node' => $node, 'attribute' => $attribute, 'arguments' => $arguments), array('type' => $type, 'is_defined_test' => false, 'ignore_strict_check' => false, 'disable_c_ext' => false), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        if (function_exists('twig_template_get_attributes') && !$this->getAttribute('disable_c_ext')) {
+            $compiler->raw('twig_template_get_attributes($this, ');
+        } else {
+            $compiler->raw('$this->getAttribute(');
+        }
+
+        if ($this->getAttribute('ignore_strict_check')) {
+            $this->getNode('node')->setAttribute('ignore_strict_check', true);
+        }
+
+        $compiler->subcompile($this->getNode('node'));
+
+        $compiler->raw(', ')->subcompile($this->getNode('attribute'));
+
+        if (count($this->getNode('arguments')) || Twig_TemplateInterface::ANY_CALL !== $this->getAttribute('type') || $this->getAttribute('is_defined_test') || $this->getAttribute('ignore_strict_check')) {
+            $compiler->raw(', ')->subcompile($this->getNode('arguments'));
+
+            if (Twig_TemplateInterface::ANY_CALL !== $this->getAttribute('type') || $this->getAttribute('is_defined_test') || $this->getAttribute('ignore_strict_check')) {
+                $compiler->raw(', ')->repr($this->getAttribute('type'));
+            }
+
+            if ($this->getAttribute('is_defined_test') || $this->getAttribute('ignore_strict_check')) {
+                $compiler->raw(', '.($this->getAttribute('is_defined_test') ? 'true' : 'false'));
+            }
+
+            if ($this->getAttribute('ignore_strict_check')) {
+                $compiler->raw(', '.($this->getAttribute('ignore_strict_check') ? 'true' : 'false'));
+            }
+        }
+
+        $compiler->raw(')');
+    }
+}
diff --git a/inc/Twig/Node/Expression/MethodCall.php b/inc/Twig/Node/Expression/MethodCall.php
new file mode 100644
index 00000000..620b02bf
--- /dev/null
+++ b/inc/Twig/Node/Expression/MethodCall.php
@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_MethodCall extends Twig_Node_Expression
+{
+    public function __construct(Twig_Node_Expression $node, $method, Twig_Node_Expression_Array $arguments, $lineno)
+    {
+        parent::__construct(array('node' => $node, 'arguments' => $arguments), array('method' => $method, 'safe' => false), $lineno);
+
+        if ($node instanceof Twig_Node_Expression_Name) {
+            $node->setAttribute('always_defined', true);
+        }
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->subcompile($this->getNode('node'))
+            ->raw('->')
+            ->raw($this->getAttribute('method'))
+            ->raw('(')
+        ;
+        $first = true;
+        foreach ($this->getNode('arguments')->getKeyValuePairs() as $pair) {
+            if (!$first) {
+                $compiler->raw(', ');
+            }
+            $first = false;
+
+            $compiler->subcompile($pair['value']);
+        }
+        $compiler->raw(')');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Name.php b/inc/Twig/Node/Expression/Name.php
new file mode 100644
index 00000000..3b8fae01
--- /dev/null
+++ b/inc/Twig/Node/Expression/Name.php
@@ -0,0 +1,88 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Name extends Twig_Node_Expression
+{
+    protected $specialVars = array(
+        '_self'    => '$this',
+        '_context' => '$context',
+        '_charset' => '$this->env->getCharset()',
+    );
+
+    public function __construct($name, $lineno)
+    {
+        parent::__construct(array(), array('name' => $name, 'is_defined_test' => false, 'ignore_strict_check' => false, 'always_defined' => false), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+
+        if ($this->getAttribute('is_defined_test')) {
+            if ($this->isSpecial()) {
+                $compiler->repr(true);
+            } else {
+                $compiler->raw('array_key_exists(')->repr($name)->raw(', $context)');
+            }
+        } elseif ($this->isSpecial()) {
+            $compiler->raw($this->specialVars[$name]);
+        } elseif ($this->getAttribute('always_defined')) {
+            $compiler
+                ->raw('$context[')
+                ->string($name)
+                ->raw(']')
+            ;
+        } else {
+            // remove the non-PHP 5.4 version when PHP 5.3 support is dropped
+            // as the non-optimized version is just a workaround for slow ternary operator
+            // when the context has a lot of variables
+            if (version_compare(phpversion(), '5.4.0RC1', '>=')) {
+                // PHP 5.4 ternary operator performance was optimized
+                $compiler
+                    ->raw('(isset($context[')
+                    ->string($name)
+                    ->raw(']) ? $context[')
+                    ->string($name)
+                    ->raw('] : ')
+                ;
+
+                if ($this->getAttribute('ignore_strict_check') || !$compiler->getEnvironment()->isStrictVariables()) {
+                    $compiler->raw('null)');
+                } else {
+                    $compiler->raw('$this->getContext($context, ')->string($name)->raw('))');
+                }
+            } else {
+                $compiler
+                    ->raw('$this->getContext($context, ')
+                    ->string($name)
+                ;
+
+                if ($this->getAttribute('ignore_strict_check')) {
+                    $compiler->raw(', true');
+                }
+
+                $compiler
+                    ->raw(')')
+                ;
+            }
+        }
+    }
+
+    public function isSpecial()
+    {
+        return isset($this->specialVars[$this->getAttribute('name')]);
+    }
+
+    public function isSimple()
+    {
+        return !$this->isSpecial() && !$this->getAttribute('is_defined_test');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Parent.php b/inc/Twig/Node/Expression/Parent.php
new file mode 100644
index 00000000..dcf618c0
--- /dev/null
+++ b/inc/Twig/Node/Expression/Parent.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a parent node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Parent extends Twig_Node_Expression
+{
+    public function __construct($name, $lineno, $tag = null)
+    {
+        parent::__construct(array(), array('output' => false, 'name' => $name), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        if ($this->getAttribute('output')) {
+            $compiler
+                ->addDebugInfo($this)
+                ->write("\$this->displayParentBlock(")
+                ->string($this->getAttribute('name'))
+                ->raw(", \$context, \$blocks);\n")
+            ;
+        } else {
+            $compiler
+                ->raw("\$this->renderParentBlock(")
+                ->string($this->getAttribute('name'))
+                ->raw(", \$context, \$blocks)")
+            ;
+        }
+    }
+}
diff --git a/inc/Twig/Node/Expression/TempName.php b/inc/Twig/Node/Expression/TempName.php
new file mode 100644
index 00000000..e6b058e8
--- /dev/null
+++ b/inc/Twig/Node/Expression/TempName.php
@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_TempName extends Twig_Node_Expression
+{
+    public function __construct($name, $lineno)
+    {
+        parent::__construct(array(), array('name' => $name), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('$_')
+            ->raw($this->getAttribute('name'))
+            ->raw('_')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test.php b/inc/Twig/Node/Expression/Test.php
new file mode 100644
index 00000000..639f501a
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test.php
@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Test extends Twig_Node_Expression_Call
+{
+    public function __construct(Twig_NodeInterface $node, $name, Twig_NodeInterface $arguments = null, $lineno)
+    {
+        parent::__construct(array('node' => $node, 'arguments' => $arguments), array('name' => $name), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+        $test = $compiler->getEnvironment()->getTest($name);
+
+        $this->setAttribute('name', $name);
+        $this->setAttribute('type', 'test');
+        $this->setAttribute('thing', $test);
+        if ($test instanceof Twig_TestCallableInterface || $test instanceof Twig_SimpleTest) {
+            $this->setAttribute('callable', $test->getCallable());
+        }
+
+        $this->compileCallable($compiler);
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Constant.php b/inc/Twig/Node/Expression/Test/Constant.php
new file mode 100644
index 00000000..de55f5f5
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Constant.php
@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is the exact same value as a constant.
+ *
+ * <pre>
+ *  {% if post.status is constant('Post::PUBLISHED') %}
+ *    the status attribute is exactly the same as Post::PUBLISHED
+ *  {% endif %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Constant extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' === constant(')
+        ;
+
+        if ($this->getNode('arguments')->hasNode(1)) {
+            $compiler
+                ->raw('get_class(')
+                ->subcompile($this->getNode('arguments')->getNode(1))
+                ->raw(')."::".')
+            ;
+        }
+
+        $compiler
+            ->subcompile($this->getNode('arguments')->getNode(0))
+            ->raw('))')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Defined.php b/inc/Twig/Node/Expression/Test/Defined.php
new file mode 100644
index 00000000..247b2e23
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Defined.php
@@ -0,0 +1,54 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is defined in the current context.
+ *
+ * <pre>
+ * {# defined works with variable names and variable attributes #}
+ * {% if foo is defined %}
+ *     {# ... #}
+ * {% endif %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Defined extends Twig_Node_Expression_Test
+{
+    public function __construct(Twig_NodeInterface $node, $name, Twig_NodeInterface $arguments = null, $lineno)
+    {
+        parent::__construct($node, $name, $arguments, $lineno);
+
+        if ($node instanceof Twig_Node_Expression_Name) {
+            $node->setAttribute('is_defined_test', true);
+        } elseif ($node instanceof Twig_Node_Expression_GetAttr) {
+            $node->setAttribute('is_defined_test', true);
+
+            $this->changeIgnoreStrictCheck($node);
+        } else {
+            throw new Twig_Error_Syntax('The "defined" test only works with simple variables', $this->getLine());
+        }
+    }
+
+    protected function changeIgnoreStrictCheck(Twig_Node_Expression_GetAttr $node)
+    {
+        $node->setAttribute('ignore_strict_check', true);
+
+        if ($node->getNode('node') instanceof Twig_Node_Expression_GetAttr) {
+            $this->changeIgnoreStrictCheck($node->getNode('node'));
+        }
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('node'));
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Divisibleby.php b/inc/Twig/Node/Expression/Test/Divisibleby.php
new file mode 100644
index 00000000..0aceb530
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Divisibleby.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is divisible by a number.
+ *
+ * <pre>
+ *  {% if loop.index is divisibleby(3) %}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Divisibleby extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(0 == ')
+            ->subcompile($this->getNode('node'))
+            ->raw(' % ')
+            ->subcompile($this->getNode('arguments')->getNode(0))
+            ->raw(')')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Even.php b/inc/Twig/Node/Expression/Test/Even.php
new file mode 100644
index 00000000..d7853e89
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Even.php
@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a number is even.
+ *
+ * <pre>
+ *  {{ var is even }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Even extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' % 2 == 0')
+            ->raw(')')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Null.php b/inc/Twig/Node/Expression/Test/Null.php
new file mode 100644
index 00000000..1c83825a
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Null.php
@@ -0,0 +1,31 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks that a variable is null.
+ *
+ * <pre>
+ *  {{ var is none }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Null extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(null === ')
+            ->subcompile($this->getNode('node'))
+            ->raw(')')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Odd.php b/inc/Twig/Node/Expression/Test/Odd.php
new file mode 100644
index 00000000..421c19e8
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Odd.php
@@ -0,0 +1,32 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a number is odd.
+ *
+ * <pre>
+ *  {{ var is odd }}
+ * </pre>
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Odd extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' % 2 == 1')
+            ->raw(')')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Test/Sameas.php b/inc/Twig/Node/Expression/Test/Sameas.php
new file mode 100644
index 00000000..b48905ee
--- /dev/null
+++ b/inc/Twig/Node/Expression/Test/Sameas.php
@@ -0,0 +1,29 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Checks if a variable is the same as another one (=== in PHP).
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Expression_Test_Sameas extends Twig_Node_Expression_Test
+{
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->raw('(')
+            ->subcompile($this->getNode('node'))
+            ->raw(' === ')
+            ->subcompile($this->getNode('arguments')->getNode(0))
+            ->raw(')')
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Expression/Unary.php b/inc/Twig/Node/Expression/Unary.php
new file mode 100644
index 00000000..c514388e
--- /dev/null
+++ b/inc/Twig/Node/Expression/Unary.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Node_Expression_Unary extends Twig_Node_Expression
+{
+    public function __construct(Twig_NodeInterface $node, $lineno)
+    {
+        parent::__construct(array('node' => $node), array(), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->raw('(');
+        $this->operator($compiler);
+        $compiler
+            ->subcompile($this->getNode('node'))
+            ->raw(')')
+        ;
+    }
+
+    abstract public function operator(Twig_Compiler $compiler);
+}
diff --git a/inc/Twig/Node/Expression/Unary/Neg.php b/inc/Twig/Node/Expression/Unary/Neg.php
new file mode 100644
index 00000000..2a3937ec
--- /dev/null
+++ b/inc/Twig/Node/Expression/Unary/Neg.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Unary_Neg extends Twig_Node_Expression_Unary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        $compiler->raw('-');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Unary/Not.php b/inc/Twig/Node/Expression/Unary/Not.php
new file mode 100644
index 00000000..f94073cf
--- /dev/null
+++ b/inc/Twig/Node/Expression/Unary/Not.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Unary_Not extends Twig_Node_Expression_Unary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        $compiler->raw('!');
+    }
+}
diff --git a/inc/Twig/Node/Expression/Unary/Pos.php b/inc/Twig/Node/Expression/Unary/Pos.php
new file mode 100644
index 00000000..04edb52a
--- /dev/null
+++ b/inc/Twig/Node/Expression/Unary/Pos.php
@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Node_Expression_Unary_Pos extends Twig_Node_Expression_Unary
+{
+    public function operator(Twig_Compiler $compiler)
+    {
+        $compiler->raw('+');
+    }
+}
diff --git a/inc/Twig/Node/Flush.php b/inc/Twig/Node/Flush.php
new file mode 100644
index 00000000..0467ddce
--- /dev/null
+++ b/inc/Twig/Node/Flush.php
@@ -0,0 +1,36 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a flush node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Flush extends Twig_Node
+{
+    public function __construct($lineno, $tag)
+    {
+        parent::__construct(array(), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write("flush();\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/For.php b/inc/Twig/Node/For.php
new file mode 100644
index 00000000..d1ff371d
--- /dev/null
+++ b/inc/Twig/Node/For.php
@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a for node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_For extends Twig_Node
+{
+    protected $loop;
+
+    public function __construct(Twig_Node_Expression_AssignName $keyTarget, Twig_Node_Expression_AssignName $valueTarget, Twig_Node_Expression $seq, Twig_Node_Expression $ifexpr = null, Twig_NodeInterface $body, Twig_NodeInterface $else = null, $lineno, $tag = null)
+    {
+        $body = new Twig_Node(array($body, $this->loop = new Twig_Node_ForLoop($lineno, $tag)));
+
+        if (null !== $ifexpr) {
+            $body = new Twig_Node_If(new Twig_Node(array($ifexpr, $body)), null, $lineno, $tag);
+        }
+
+        parent::__construct(array('key_target' => $keyTarget, 'value_target' => $valueTarget, 'seq' => $seq, 'body' => $body, 'else' => $else), array('with_loop' => true, 'ifexpr' => null !== $ifexpr), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            // the (array) cast bypasses a PHP 5.2.6 bug
+            ->write("\$context['_parent'] = (array) \$context;\n")
+            ->write("\$context['_seq'] = twig_ensure_traversable(")
+            ->subcompile($this->getNode('seq'))
+            ->raw(");\n")
+        ;
+
+        if (null !== $this->getNode('else')) {
+            $compiler->write("\$context['_iterated'] = false;\n");
+        }
+
+        if ($this->getAttribute('with_loop')) {
+            $compiler
+                ->write("\$context['loop'] = array(\n")
+                ->write("  'parent' => \$context['_parent'],\n")
+                ->write("  'index0' => 0,\n")
+                ->write("  'index'  => 1,\n")
+                ->write("  'first'  => true,\n")
+                ->write(");\n")
+            ;
+
+            if (!$this->getAttribute('ifexpr')) {
+                $compiler
+                    ->write("if (is_array(\$context['_seq']) || (is_object(\$context['_seq']) && \$context['_seq'] instanceof Countable)) {\n")
+                    ->indent()
+                    ->write("\$length = count(\$context['_seq']);\n")
+                    ->write("\$context['loop']['revindex0'] = \$length - 1;\n")
+                    ->write("\$context['loop']['revindex'] = \$length;\n")
+                    ->write("\$context['loop']['length'] = \$length;\n")
+                    ->write("\$context['loop']['last'] = 1 === \$length;\n")
+                    ->outdent()
+                    ->write("}\n")
+                ;
+            }
+        }
+
+        $this->loop->setAttribute('else', null !== $this->getNode('else'));
+        $this->loop->setAttribute('with_loop', $this->getAttribute('with_loop'));
+        $this->loop->setAttribute('ifexpr', $this->getAttribute('ifexpr'));
+
+        $compiler
+            ->write("foreach (\$context['_seq'] as ")
+            ->subcompile($this->getNode('key_target'))
+            ->raw(" => ")
+            ->subcompile($this->getNode('value_target'))
+            ->raw(") {\n")
+            ->indent()
+            ->subcompile($this->getNode('body'))
+            ->outdent()
+            ->write("}\n")
+        ;
+
+        if (null !== $this->getNode('else')) {
+            $compiler
+                ->write("if (!\$context['_iterated']) {\n")
+                ->indent()
+                ->subcompile($this->getNode('else'))
+                ->outdent()
+                ->write("}\n")
+            ;
+        }
+
+        $compiler->write("\$_parent = \$context['_parent'];\n");
+
+        // remove some "private" loop variables (needed for nested loops)
+        $compiler->write('unset($context[\'_seq\'], $context[\'_iterated\'], $context[\''.$this->getNode('key_target')->getAttribute('name').'\'], $context[\''.$this->getNode('value_target')->getAttribute('name').'\'], $context[\'_parent\'], $context[\'loop\']);'."\n");
+
+        // keep the values set in the inner context for variables defined in the outer context
+        $compiler->write("\$context = array_intersect_key(\$context, \$_parent) + \$_parent;\n");
+    }
+}
diff --git a/inc/Twig/Node/ForLoop.php b/inc/Twig/Node/ForLoop.php
new file mode 100644
index 00000000..b8841583
--- /dev/null
+++ b/inc/Twig/Node/ForLoop.php
@@ -0,0 +1,55 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Internal node used by the for node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_ForLoop extends Twig_Node
+{
+    public function __construct($lineno, $tag = null)
+    {
+        parent::__construct(array(), array('with_loop' => false, 'ifexpr' => false, 'else' => false), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        if ($this->getAttribute('else')) {
+            $compiler->write("\$context['_iterated'] = true;\n");
+        }
+
+        if ($this->getAttribute('with_loop')) {
+            $compiler
+                ->write("++\$context['loop']['index0'];\n")
+                ->write("++\$context['loop']['index'];\n")
+                ->write("\$context['loop']['first'] = false;\n")
+            ;
+
+            if (!$this->getAttribute('ifexpr')) {
+                $compiler
+                    ->write("if (isset(\$context['loop']['length'])) {\n")
+                    ->indent()
+                    ->write("--\$context['loop']['revindex0'];\n")
+                    ->write("--\$context['loop']['revindex'];\n")
+                    ->write("\$context['loop']['last'] = 0 === \$context['loop']['revindex0'];\n")
+                    ->outdent()
+                    ->write("}\n")
+                ;
+            }
+        }
+    }
+}
diff --git a/inc/Twig/Node/If.php b/inc/Twig/Node/If.php
new file mode 100644
index 00000000..4296a8d6
--- /dev/null
+++ b/inc/Twig/Node/If.php
@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an if node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_If extends Twig_Node
+{
+    public function __construct(Twig_NodeInterface $tests, Twig_NodeInterface $else = null, $lineno, $tag = null)
+    {
+        parent::__construct(array('tests' => $tests, 'else' => $else), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->addDebugInfo($this);
+        for ($i = 0; $i < count($this->getNode('tests')); $i += 2) {
+            if ($i > 0) {
+                $compiler
+                    ->outdent()
+                    ->write("} elseif (")
+                ;
+            } else {
+                $compiler
+                    ->write('if (')
+                ;
+            }
+
+            $compiler
+                ->subcompile($this->getNode('tests')->getNode($i))
+                ->raw(") {\n")
+                ->indent()
+                ->subcompile($this->getNode('tests')->getNode($i + 1))
+            ;
+        }
+
+        if ($this->hasNode('else') && null !== $this->getNode('else')) {
+            $compiler
+                ->outdent()
+                ->write("} else {\n")
+                ->indent()
+                ->subcompile($this->getNode('else'))
+            ;
+        }
+
+        $compiler
+            ->outdent()
+            ->write("}\n");
+    }
+}
diff --git a/inc/Twig/Node/Import.php b/inc/Twig/Node/Import.php
new file mode 100644
index 00000000..99efc091
--- /dev/null
+++ b/inc/Twig/Node/Import.php
@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an import node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Import extends Twig_Node
+{
+    public function __construct(Twig_Node_Expression $expr, Twig_Node_Expression $var, $lineno, $tag = null)
+    {
+        parent::__construct(array('expr' => $expr, 'var' => $var), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write('')
+            ->subcompile($this->getNode('var'))
+            ->raw(' = ')
+        ;
+
+        if ($this->getNode('expr') instanceof Twig_Node_Expression_Name && '_self' === $this->getNode('expr')->getAttribute('name')) {
+            $compiler->raw("\$this");
+        } else {
+            $compiler
+                ->raw('$this->env->loadTemplate(')
+                ->subcompile($this->getNode('expr'))
+                ->raw(")")
+            ;
+        }
+
+        $compiler->raw(";\n");
+    }
+}
diff --git a/inc/Twig/Node/Include.php b/inc/Twig/Node/Include.php
new file mode 100644
index 00000000..ed4a3751
--- /dev/null
+++ b/inc/Twig/Node/Include.php
@@ -0,0 +1,99 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents an include node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Include extends Twig_Node implements Twig_NodeOutputInterface
+{
+    public function __construct(Twig_Node_Expression $expr, Twig_Node_Expression $variables = null, $only = false, $ignoreMissing = false, $lineno, $tag = null)
+    {
+        parent::__construct(array('expr' => $expr, 'variables' => $variables), array('only' => (Boolean) $only, 'ignore_missing' => (Boolean) $ignoreMissing), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->addDebugInfo($this);
+
+        if ($this->getAttribute('ignore_missing')) {
+            $compiler
+                ->write("try {\n")
+                ->indent()
+            ;
+        }
+
+        $this->addGetTemplate($compiler);
+
+        $compiler->raw('->display(');
+
+        $this->addTemplateArguments($compiler);
+
+        $compiler->raw(");\n");
+
+        if ($this->getAttribute('ignore_missing')) {
+            $compiler
+                ->outdent()
+                ->write("} catch (Twig_Error_Loader \$e) {\n")
+                ->indent()
+                ->write("// ignore missing template\n")
+                ->outdent()
+                ->write("}\n\n")
+            ;
+        }
+    }
+
+    protected function addGetTemplate(Twig_Compiler $compiler)
+    {
+        if ($this->getNode('expr') instanceof Twig_Node_Expression_Constant) {
+            $compiler
+                ->write("\$this->env->loadTemplate(")
+                ->subcompile($this->getNode('expr'))
+                ->raw(")")
+            ;
+        } else {
+            $compiler
+                ->write("\$template = \$this->env->resolveTemplate(")
+                ->subcompile($this->getNode('expr'))
+                ->raw(");\n")
+                ->write('$template')
+            ;
+        }
+    }
+
+    protected function addTemplateArguments(Twig_Compiler $compiler)
+    {
+        if (false === $this->getAttribute('only')) {
+            if (null === $this->getNode('variables')) {
+                $compiler->raw('$context');
+            } else {
+                $compiler
+                    ->raw('array_merge($context, ')
+                    ->subcompile($this->getNode('variables'))
+                    ->raw(')')
+                ;
+            }
+        } else {
+            if (null === $this->getNode('variables')) {
+                $compiler->raw('array()');
+            } else {
+                $compiler->subcompile($this->getNode('variables'));
+            }
+        }
+    }
+}
diff --git a/inc/Twig/Node/Macro.php b/inc/Twig/Node/Macro.php
new file mode 100644
index 00000000..89910618
--- /dev/null
+++ b/inc/Twig/Node/Macro.php
@@ -0,0 +1,96 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a macro node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Macro extends Twig_Node
+{
+    public function __construct($name, Twig_NodeInterface $body, Twig_NodeInterface $arguments, $lineno, $tag = null)
+    {
+        parent::__construct(array('body' => $body, 'arguments' => $arguments), array('name' => $name), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write(sprintf("public function get%s(", $this->getAttribute('name')))
+        ;
+
+        $count = count($this->getNode('arguments'));
+        $pos = 0;
+        foreach ($this->getNode('arguments') as $name => $default) {
+            $compiler
+                ->raw('$_'.$name.' = ')
+                ->subcompile($default)
+            ;
+
+            if (++$pos < $count) {
+                $compiler->raw(', ');
+            }
+        }
+
+        $compiler
+            ->raw(")\n")
+            ->write("{\n")
+            ->indent()
+        ;
+
+        if (!count($this->getNode('arguments'))) {
+            $compiler->write("\$context = \$this->env->getGlobals();\n\n");
+        } else {
+            $compiler
+                ->write("\$context = \$this->env->mergeGlobals(array(\n")
+                ->indent()
+            ;
+
+            foreach ($this->getNode('arguments') as $name => $default) {
+                $compiler
+                    ->write('')
+                    ->string($name)
+                    ->raw(' => $_'.$name)
+                    ->raw(",\n")
+                ;
+            }
+
+            $compiler
+                ->outdent()
+                ->write("));\n\n")
+            ;
+        }
+
+        $compiler
+            ->write("\$blocks = array();\n\n")
+            ->write("ob_start();\n")
+            ->write("try {\n")
+            ->indent()
+            ->subcompile($this->getNode('body'))
+            ->outdent()
+            ->write("} catch (Exception \$e) {\n")
+            ->indent()
+            ->write("ob_end_clean();\n\n")
+            ->write("throw \$e;\n")
+            ->outdent()
+            ->write("}\n\n")
+            ->write("return ('' === \$tmp = ob_get_clean()) ? '' : new Twig_Markup(\$tmp, \$this->env->getCharset());\n")
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Module.php b/inc/Twig/Node/Module.php
new file mode 100644
index 00000000..585048b8
--- /dev/null
+++ b/inc/Twig/Node/Module.php
@@ -0,0 +1,371 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a module node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Module extends Twig_Node
+{
+    public function __construct(Twig_NodeInterface $body, Twig_Node_Expression $parent = null, Twig_NodeInterface $blocks, Twig_NodeInterface $macros, Twig_NodeInterface $traits, $embeddedTemplates, $filename)
+    {
+        // embedded templates are set as attributes so that they are only visited once by the visitors
+        parent::__construct(array('parent' => $parent, 'body' => $body, 'blocks' => $blocks, 'macros' => $macros, 'traits' => $traits), array('filename' => $filename, 'index' => null, 'embedded_templates' => $embeddedTemplates), 1);
+    }
+
+    public function setIndex($index)
+    {
+        $this->setAttribute('index', $index);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $this->compileTemplate($compiler);
+
+        foreach ($this->getAttribute('embedded_templates') as $template) {
+            $compiler->subcompile($template);
+        }
+    }
+
+    protected function compileTemplate(Twig_Compiler $compiler)
+    {
+        if (!$this->getAttribute('index')) {
+            $compiler->write('<?php');
+        }
+
+        $this->compileClassHeader($compiler);
+
+        if (count($this->getNode('blocks')) || count($this->getNode('traits')) || null === $this->getNode('parent') || $this->getNode('parent') instanceof Twig_Node_Expression_Constant) {
+            $this->compileConstructor($compiler);
+        }
+
+        $this->compileGetParent($compiler);
+
+        $this->compileDisplayHeader($compiler);
+
+        $this->compileDisplayBody($compiler);
+
+        $this->compileDisplayFooter($compiler);
+
+        $compiler->subcompile($this->getNode('blocks'));
+
+        $this->compileMacros($compiler);
+
+        $this->compileGetTemplateName($compiler);
+
+        $this->compileIsTraitable($compiler);
+
+        $this->compileDebugInfo($compiler);
+
+        $this->compileClassFooter($compiler);
+    }
+
+    protected function compileGetParent(Twig_Compiler $compiler)
+    {
+        if (null === $this->getNode('parent')) {
+            return;
+        }
+
+        $compiler
+            ->write("protected function doGetParent(array \$context)\n", "{\n")
+            ->indent()
+            ->write("return ")
+        ;
+
+        if ($this->getNode('parent') instanceof Twig_Node_Expression_Constant) {
+            $compiler->subcompile($this->getNode('parent'));
+        } else {
+            $compiler
+                ->raw("\$this->env->resolveTemplate(")
+                ->subcompile($this->getNode('parent'))
+                ->raw(")")
+            ;
+        }
+
+        $compiler
+            ->raw(";\n")
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+
+    protected function compileDisplayBody(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('body'));
+
+        if (null !== $this->getNode('parent')) {
+            if ($this->getNode('parent') instanceof Twig_Node_Expression_Constant) {
+                $compiler->write("\$this->parent");
+            } else {
+                $compiler->write("\$this->getParent(\$context)");
+            }
+            $compiler->raw("->display(\$context, array_merge(\$this->blocks, \$blocks));\n");
+        }
+    }
+
+    protected function compileClassHeader(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write("\n\n")
+            // if the filename contains */, add a blank to avoid a PHP parse error
+            ->write("/* ".str_replace('*/', '* /', $this->getAttribute('filename'))." */\n")
+            ->write('class '.$compiler->getEnvironment()->getTemplateClass($this->getAttribute('filename'), $this->getAttribute('index')))
+            ->raw(sprintf(" extends %s\n", $compiler->getEnvironment()->getBaseTemplateClass()))
+            ->write("{\n")
+            ->indent()
+        ;
+    }
+
+    protected function compileConstructor(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write("public function __construct(Twig_Environment \$env)\n", "{\n")
+            ->indent()
+            ->write("parent::__construct(\$env);\n\n")
+        ;
+
+        // parent
+        if (null === $this->getNode('parent')) {
+            $compiler->write("\$this->parent = false;\n\n");
+        } elseif ($this->getNode('parent') instanceof Twig_Node_Expression_Constant) {
+            $compiler
+                ->write("\$this->parent = \$this->env->loadTemplate(")
+                ->subcompile($this->getNode('parent'))
+                ->raw(");\n\n")
+            ;
+        }
+
+        $countTraits = count($this->getNode('traits'));
+        if ($countTraits) {
+            // traits
+            foreach ($this->getNode('traits') as $i => $trait) {
+                $this->compileLoadTemplate($compiler, $trait->getNode('template'), sprintf('$_trait_%s', $i));
+
+                $compiler
+                    ->addDebugInfo($trait->getNode('template'))
+                    ->write(sprintf("if (!\$_trait_%s->isTraitable()) {\n", $i))
+                    ->indent()
+                    ->write("throw new Twig_Error_Runtime('Template \"'.")
+                    ->subcompile($trait->getNode('template'))
+                    ->raw(".'\" cannot be used as a trait.');\n")
+                    ->outdent()
+                    ->write("}\n")
+                    ->write(sprintf("\$_trait_%s_blocks = \$_trait_%s->getBlocks();\n\n", $i, $i))
+                ;
+
+                foreach ($trait->getNode('targets') as $key => $value) {
+                    $compiler
+                        ->write(sprintf("\$_trait_%s_blocks[", $i))
+                        ->subcompile($value)
+                        ->raw(sprintf("] = \$_trait_%s_blocks[", $i))
+                        ->string($key)
+                        ->raw(sprintf("]; unset(\$_trait_%s_blocks[", $i))
+                        ->string($key)
+                        ->raw("]);\n\n")
+                    ;
+                }
+            }
+
+            if ($countTraits > 1) {
+                $compiler
+                    ->write("\$this->traits = array_merge(\n")
+                    ->indent()
+                ;
+
+                for ($i = 0; $i < $countTraits; $i++) {
+                    $compiler
+                        ->write(sprintf("\$_trait_%s_blocks".($i == $countTraits - 1 ? '' : ',')."\n", $i))
+                    ;
+                }
+
+                $compiler
+                    ->outdent()
+                    ->write(");\n\n")
+                ;
+            } else {
+                $compiler
+                    ->write("\$this->traits = \$_trait_0_blocks;\n\n")
+                ;
+            }
+
+            $compiler
+                ->write("\$this->blocks = array_merge(\n")
+                ->indent()
+                ->write("\$this->traits,\n")
+                ->write("array(\n")
+            ;
+        } else {
+            $compiler
+                ->write("\$this->blocks = array(\n")
+            ;
+        }
+
+        // blocks
+        $compiler
+            ->indent()
+        ;
+
+        foreach ($this->getNode('blocks') as $name => $node) {
+            $compiler
+                ->write(sprintf("'%s' => array(\$this, 'block_%s'),\n", $name, $name))
+            ;
+        }
+
+        if ($countTraits) {
+            $compiler
+                ->outdent()
+                ->write(")\n")
+            ;
+        }
+
+        $compiler
+            ->outdent()
+            ->write(");\n")
+            ->outdent()
+            ->write("}\n\n");
+        ;
+    }
+
+    protected function compileDisplayHeader(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write("protected function doDisplay(array \$context, array \$blocks = array())\n", "{\n")
+            ->indent()
+        ;
+    }
+
+    protected function compileDisplayFooter(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+
+    protected function compileClassFooter(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->outdent()
+            ->write("}\n")
+        ;
+    }
+
+    protected function compileMacros(Twig_Compiler $compiler)
+    {
+        $compiler->subcompile($this->getNode('macros'));
+    }
+
+    protected function compileGetTemplateName(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write("public function getTemplateName()\n", "{\n")
+            ->indent()
+            ->write('return ')
+            ->repr($this->getAttribute('filename'))
+            ->raw(";\n")
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+
+    protected function compileIsTraitable(Twig_Compiler $compiler)
+    {
+        // A template can be used as a trait if:
+        //   * it has no parent
+        //   * it has no macros
+        //   * it has no body
+        //
+        // Put another way, a template can be used as a trait if it
+        // only contains blocks and use statements.
+        $traitable = null === $this->getNode('parent') && 0 === count($this->getNode('macros'));
+        if ($traitable) {
+            if ($this->getNode('body') instanceof Twig_Node_Body) {
+                $nodes = $this->getNode('body')->getNode(0);
+            } else {
+                $nodes = $this->getNode('body');
+            }
+
+            if (!count($nodes)) {
+                $nodes = new Twig_Node(array($nodes));
+            }
+
+            foreach ($nodes as $node) {
+                if (!count($node)) {
+                    continue;
+                }
+
+                if ($node instanceof Twig_Node_Text && ctype_space($node->getAttribute('data'))) {
+                    continue;
+                }
+
+                if ($node instanceof Twig_Node_BlockReference) {
+                    continue;
+                }
+
+                $traitable = false;
+                break;
+            }
+        }
+
+        if ($traitable) {
+            return;
+        }
+
+        $compiler
+            ->write("public function isTraitable()\n", "{\n")
+            ->indent()
+            ->write(sprintf("return %s;\n", $traitable ? 'true' : 'false'))
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+
+    protected function compileDebugInfo(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->write("public function getDebugInfo()\n", "{\n")
+            ->indent()
+            ->write(sprintf("return %s;\n", str_replace("\n", '', var_export(array_reverse($compiler->getDebugInfo(), true), true))))
+            ->outdent()
+            ->write("}\n")
+        ;
+    }
+
+    protected function compileLoadTemplate(Twig_Compiler $compiler, $node, $var)
+    {
+        if ($node instanceof Twig_Node_Expression_Constant) {
+            $compiler
+                ->write(sprintf("%s = \$this->env->loadTemplate(", $var))
+                ->subcompile($node)
+                ->raw(");\n")
+            ;
+        } else {
+            $compiler
+                ->write(sprintf("%s = ", $var))
+                ->subcompile($node)
+                ->raw(";\n")
+                ->write(sprintf("if (!%s", $var))
+                ->raw(" instanceof Twig_Template) {\n")
+                ->indent()
+                ->write(sprintf("%s = \$this->env->loadTemplate(%s);\n", $var, $var))
+                ->outdent()
+                ->write("}\n")
+            ;
+        }
+    }
+}
diff --git a/inc/Twig/Node/Print.php b/inc/Twig/Node/Print.php
new file mode 100644
index 00000000..b0c41d1d
--- /dev/null
+++ b/inc/Twig/Node/Print.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a node that outputs an expression.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Print extends Twig_Node implements Twig_NodeOutputInterface
+{
+    public function __construct(Twig_Node_Expression $expr, $lineno, $tag = null)
+    {
+        parent::__construct(array('expr' => $expr), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write('echo ')
+            ->subcompile($this->getNode('expr'))
+            ->raw(";\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Sandbox.php b/inc/Twig/Node/Sandbox.php
new file mode 100644
index 00000000..8cf3ed44
--- /dev/null
+++ b/inc/Twig/Node/Sandbox.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a sandbox node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Sandbox extends Twig_Node
+{
+    public function __construct(Twig_NodeInterface $body, $lineno, $tag = null)
+    {
+        parent::__construct(array('body' => $body), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write("\$sandbox = \$this->env->getExtension('sandbox');\n")
+            ->write("if (!\$alreadySandboxed = \$sandbox->isSandboxed()) {\n")
+            ->indent()
+            ->write("\$sandbox->enableSandbox();\n")
+            ->outdent()
+            ->write("}\n")
+            ->subcompile($this->getNode('body'))
+            ->write("if (!\$alreadySandboxed) {\n")
+            ->indent()
+            ->write("\$sandbox->disableSandbox();\n")
+            ->outdent()
+            ->write("}\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/SandboxedModule.php b/inc/Twig/Node/SandboxedModule.php
new file mode 100644
index 00000000..be1f5daa
--- /dev/null
+++ b/inc/Twig/Node/SandboxedModule.php
@@ -0,0 +1,60 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a module node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_SandboxedModule extends Twig_Node_Module
+{
+    protected $usedFilters;
+    protected $usedTags;
+    protected $usedFunctions;
+
+    public function __construct(Twig_Node_Module $node, array $usedFilters, array $usedTags, array $usedFunctions)
+    {
+        parent::__construct($node->getNode('body'), $node->getNode('parent'), $node->getNode('blocks'), $node->getNode('macros'), $node->getNode('traits'), $node->getAttribute('embedded_templates'), $node->getAttribute('filename'), $node->getLine(), $node->getNodeTag());
+
+        $this->setAttribute('index', $node->getAttribute('index'));
+
+        $this->usedFilters = $usedFilters;
+        $this->usedTags = $usedTags;
+        $this->usedFunctions = $usedFunctions;
+    }
+
+    protected function compileDisplayBody(Twig_Compiler $compiler)
+    {
+        $compiler->write("\$this->checkSecurity();\n");
+
+        parent::compileDisplayBody($compiler);
+    }
+
+    protected function compileDisplayFooter(Twig_Compiler $compiler)
+    {
+        parent::compileDisplayFooter($compiler);
+
+        $compiler
+            ->write("protected function checkSecurity()\n", "{\n")
+            ->indent()
+            ->write("\$this->env->getExtension('sandbox')->checkSecurity(\n")
+            ->indent()
+            ->write(!$this->usedTags ? "array(),\n" : "array('".implode('\', \'', $this->usedTags)."'),\n")
+            ->write(!$this->usedFilters ? "array(),\n" : "array('".implode('\', \'', $this->usedFilters)."'),\n")
+            ->write(!$this->usedFunctions ? "array()\n" : "array('".implode('\', \'', $this->usedFunctions)."')\n")
+            ->outdent()
+            ->write(");\n")
+            ->outdent()
+            ->write("}\n\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/SandboxedPrint.php b/inc/Twig/Node/SandboxedPrint.php
new file mode 100644
index 00000000..73dfaa96
--- /dev/null
+++ b/inc/Twig/Node/SandboxedPrint.php
@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_Node_SandboxedPrint adds a check for the __toString() method
+ * when the variable is an object and the sandbox is activated.
+ *
+ * When there is a simple Print statement, like {{ article }},
+ * and if the sandbox is enabled, we need to check that the __toString()
+ * method is allowed if 'article' is an object.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_SandboxedPrint extends Twig_Node_Print
+{
+    public function __construct(Twig_Node_Expression $expr, $lineno, $tag = null)
+    {
+        parent::__construct($expr, $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write('echo $this->env->getExtension(\'sandbox\')->ensureToStringAllowed(')
+            ->subcompile($this->getNode('expr'))
+            ->raw(");\n")
+        ;
+    }
+
+    /**
+     * Removes node filters.
+     *
+     * This is mostly needed when another visitor adds filters (like the escaper one).
+     *
+     * @param Twig_Node $node A Node
+     */
+    protected function removeNodeFilter($node)
+    {
+        if ($node instanceof Twig_Node_Expression_Filter) {
+            return $this->removeNodeFilter($node->getNode('node'));
+        }
+
+        return $node;
+    }
+}
diff --git a/inc/Twig/Node/Set.php b/inc/Twig/Node/Set.php
new file mode 100644
index 00000000..4c9c16ce
--- /dev/null
+++ b/inc/Twig/Node/Set.php
@@ -0,0 +1,101 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a set node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Set extends Twig_Node
+{
+    public function __construct($capture, Twig_NodeInterface $names, Twig_NodeInterface $values, $lineno, $tag = null)
+    {
+        parent::__construct(array('names' => $names, 'values' => $values), array('capture' => $capture, 'safe' => false), $lineno, $tag);
+
+        /*
+         * Optimizes the node when capture is used for a large block of text.
+         *
+         * {% set foo %}foo{% endset %} is compiled to $context['foo'] = new Twig_Markup("foo");
+         */
+        if ($this->getAttribute('capture')) {
+            $this->setAttribute('safe', true);
+
+            $values = $this->getNode('values');
+            if ($values instanceof Twig_Node_Text) {
+                $this->setNode('values', new Twig_Node_Expression_Constant($values->getAttribute('data'), $values->getLine()));
+                $this->setAttribute('capture', false);
+            }
+        }
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler->addDebugInfo($this);
+
+        if (count($this->getNode('names')) > 1) {
+            $compiler->write('list(');
+            foreach ($this->getNode('names') as $idx => $node) {
+                if ($idx) {
+                    $compiler->raw(', ');
+                }
+
+                $compiler->subcompile($node);
+            }
+            $compiler->raw(')');
+        } else {
+            if ($this->getAttribute('capture')) {
+                $compiler
+                    ->write("ob_start();\n")
+                    ->subcompile($this->getNode('values'))
+                ;
+            }
+
+            $compiler->subcompile($this->getNode('names'), false);
+
+            if ($this->getAttribute('capture')) {
+                $compiler->raw(" = ('' === \$tmp = ob_get_clean()) ? '' : new Twig_Markup(\$tmp, \$this->env->getCharset())");
+            }
+        }
+
+        if (!$this->getAttribute('capture')) {
+            $compiler->raw(' = ');
+
+            if (count($this->getNode('names')) > 1) {
+                $compiler->write('array(');
+                foreach ($this->getNode('values') as $idx => $value) {
+                    if ($idx) {
+                        $compiler->raw(', ');
+                    }
+
+                    $compiler->subcompile($value);
+                }
+                $compiler->raw(')');
+            } else {
+                if ($this->getAttribute('safe')) {
+                    $compiler
+                        ->raw("('' === \$tmp = ")
+                        ->subcompile($this->getNode('values'))
+                        ->raw(") ? '' : new Twig_Markup(\$tmp, \$this->env->getCharset())")
+                    ;
+                } else {
+                    $compiler->subcompile($this->getNode('values'));
+                }
+            }
+        }
+
+        $compiler->raw(";\n");
+    }
+}
diff --git a/inc/Twig/Node/SetTemp.php b/inc/Twig/Node/SetTemp.php
new file mode 100644
index 00000000..3bdd1cb7
--- /dev/null
+++ b/inc/Twig/Node/SetTemp.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+class Twig_Node_SetTemp extends Twig_Node
+{
+    public function __construct($name, $lineno)
+    {
+        parent::__construct(array(), array('name' => $name), $lineno);
+    }
+
+    public function compile(Twig_Compiler $compiler)
+    {
+        $name = $this->getAttribute('name');
+        $compiler
+            ->addDebugInfo($this)
+            ->write('if (isset($context[')
+            ->string($name)
+            ->raw('])) { $_')
+            ->raw($name)
+            ->raw('_ = $context[')
+            ->repr($name)
+            ->raw(']; } else { $_')
+            ->raw($name)
+            ->raw("_ = null; }\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Spaceless.php b/inc/Twig/Node/Spaceless.php
new file mode 100644
index 00000000..7555fa0f
--- /dev/null
+++ b/inc/Twig/Node/Spaceless.php
@@ -0,0 +1,40 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a spaceless node.
+ *
+ * It removes spaces between HTML tags.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Spaceless extends Twig_Node
+{
+    public function __construct(Twig_NodeInterface $body, $lineno, $tag = 'spaceless')
+    {
+        parent::__construct(array('body' => $body), array(), $lineno, $tag);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write("ob_start();\n")
+            ->subcompile($this->getNode('body'))
+            ->write("echo trim(preg_replace('/>\s+</', '><', ob_get_clean()));\n")
+        ;
+    }
+}
diff --git a/inc/Twig/Node/Text.php b/inc/Twig/Node/Text.php
new file mode 100644
index 00000000..21bdcea1
--- /dev/null
+++ b/inc/Twig/Node/Text.php
@@ -0,0 +1,39 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a text node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Node_Text extends Twig_Node implements Twig_NodeOutputInterface
+{
+    public function __construct($data, $lineno)
+    {
+        parent::__construct(array(), array('data' => $data), $lineno);
+    }
+
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler)
+    {
+        $compiler
+            ->addDebugInfo($this)
+            ->write('echo ')
+            ->string($this->getAttribute('data'))
+            ->raw(";\n")
+        ;
+    }
+}
diff --git a/inc/Twig/NodeInterface.php b/inc/Twig/NodeInterface.php
new file mode 100644
index 00000000..f0ef7258
--- /dev/null
+++ b/inc/Twig/NodeInterface.php
@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a node in the AST.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_NodeInterface extends Countable, IteratorAggregate
+{
+    /**
+     * Compiles the node to PHP.
+     *
+     * @param Twig_Compiler A Twig_Compiler instance
+     */
+    public function compile(Twig_Compiler $compiler);
+
+    public function getLine();
+
+    public function getNodeTag();
+}
diff --git a/inc/Twig/NodeOutputInterface.php b/inc/Twig/NodeOutputInterface.php
new file mode 100644
index 00000000..22172c09
--- /dev/null
+++ b/inc/Twig/NodeOutputInterface.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a displayable node in the AST.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_NodeOutputInterface
+{
+}
diff --git a/inc/Twig/NodeTraverser.php b/inc/Twig/NodeTraverser.php
new file mode 100644
index 00000000..28cba1ad
--- /dev/null
+++ b/inc/Twig/NodeTraverser.php
@@ -0,0 +1,88 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_NodeTraverser is a node traverser.
+ *
+ * It visits all nodes and their children and call the given visitor for each.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_NodeTraverser
+{
+    protected $env;
+    protected $visitors;
+
+    /**
+     * Constructor.
+     *
+     * @param Twig_Environment $env      A Twig_Environment instance
+     * @param array            $visitors An array of Twig_NodeVisitorInterface instances
+     */
+    public function __construct(Twig_Environment $env, array $visitors = array())
+    {
+        $this->env = $env;
+        $this->visitors = array();
+        foreach ($visitors as $visitor) {
+            $this->addVisitor($visitor);
+        }
+    }
+
+    /**
+     * Adds a visitor.
+     *
+     * @param Twig_NodeVisitorInterface $visitor A Twig_NodeVisitorInterface instance
+     */
+    public function addVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        if (!isset($this->visitors[$visitor->getPriority()])) {
+            $this->visitors[$visitor->getPriority()] = array();
+        }
+
+        $this->visitors[$visitor->getPriority()][] = $visitor;
+    }
+
+    /**
+     * Traverses a node and calls the registered visitors.
+     *
+     * @param Twig_NodeInterface $node A Twig_NodeInterface instance
+     */
+    public function traverse(Twig_NodeInterface $node)
+    {
+        ksort($this->visitors);
+        foreach ($this->visitors as $visitors) {
+            foreach ($visitors as $visitor) {
+                $node = $this->traverseForVisitor($visitor, $node);
+            }
+        }
+
+        return $node;
+    }
+
+    protected function traverseForVisitor(Twig_NodeVisitorInterface $visitor, Twig_NodeInterface $node = null)
+    {
+        if (null === $node) {
+            return null;
+        }
+
+        $node = $visitor->enterNode($node, $this->env);
+
+        foreach ($node as $k => $n) {
+            if (false !== $n = $this->traverseForVisitor($visitor, $n)) {
+                $node->setNode($k, $n);
+            } else {
+                $node->removeNode($k);
+            }
+        }
+
+        return $visitor->leaveNode($node, $this->env);
+    }
+}
diff --git a/inc/Twig/NodeVisitor/Escaper.php b/inc/Twig/NodeVisitor/Escaper.php
new file mode 100644
index 00000000..cc4b3d71
--- /dev/null
+++ b/inc/Twig/NodeVisitor/Escaper.php
@@ -0,0 +1,167 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_NodeVisitor_Escaper implements output escaping.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_NodeVisitor_Escaper implements Twig_NodeVisitorInterface
+{
+    protected $statusStack = array();
+    protected $blocks = array();
+    protected $safeAnalysis;
+    protected $traverser;
+    protected $defaultStrategy = false;
+    protected $safeVars = array();
+
+    public function __construct()
+    {
+        $this->safeAnalysis = new Twig_NodeVisitor_SafeAnalysis();
+    }
+
+    /**
+     * Called before child nodes are visited.
+     *
+     * @param Twig_NodeInterface $node The node to visit
+     * @param Twig_Environment   $env  The Twig environment instance
+     *
+     * @return Twig_NodeInterface The modified node
+     */
+    public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Module) {
+            if ($env->hasExtension('escaper') && $defaultStrategy = $env->getExtension('escaper')->getDefaultStrategy($node->getAttribute('filename'))) {
+                $this->defaultStrategy = $defaultStrategy;
+            }
+            $this->safeVars = array();
+        } elseif ($node instanceof Twig_Node_AutoEscape) {
+            $this->statusStack[] = $node->getAttribute('value');
+        } elseif ($node instanceof Twig_Node_Block) {
+            $this->statusStack[] = isset($this->blocks[$node->getAttribute('name')]) ? $this->blocks[$node->getAttribute('name')] : $this->needEscaping($env);
+        } elseif ($node instanceof Twig_Node_Import) {
+            $this->safeVars[] = $node->getNode('var')->getAttribute('name');
+        }
+
+        return $node;
+    }
+
+    /**
+     * Called after child nodes are visited.
+     *
+     * @param Twig_NodeInterface $node The node to visit
+     * @param Twig_Environment   $env  The Twig environment instance
+     *
+     * @return Twig_NodeInterface The modified node
+     */
+    public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Module) {
+            $this->defaultStrategy = false;
+            $this->safeVars = array();
+        } elseif ($node instanceof Twig_Node_Expression_Filter) {
+            return $this->preEscapeFilterNode($node, $env);
+        } elseif ($node instanceof Twig_Node_Print) {
+            return $this->escapePrintNode($node, $env, $this->needEscaping($env));
+        }
+
+        if ($node instanceof Twig_Node_AutoEscape || $node instanceof Twig_Node_Block) {
+            array_pop($this->statusStack);
+        } elseif ($node instanceof Twig_Node_BlockReference) {
+            $this->blocks[$node->getAttribute('name')] = $this->needEscaping($env);
+        }
+
+        return $node;
+    }
+
+    protected function escapePrintNode(Twig_Node_Print $node, Twig_Environment $env, $type)
+    {
+        if (false === $type) {
+            return $node;
+        }
+
+        $expression = $node->getNode('expr');
+
+        if ($this->isSafeFor($type, $expression, $env)) {
+            return $node;
+        }
+
+        $class = get_class($node);
+
+        return new $class(
+            $this->getEscaperFilter($type, $expression),
+            $node->getLine()
+        );
+    }
+
+    protected function preEscapeFilterNode(Twig_Node_Expression_Filter $filter, Twig_Environment $env)
+    {
+        $name = $filter->getNode('filter')->getAttribute('value');
+
+        $type = $env->getFilter($name)->getPreEscape();
+        if (null === $type) {
+            return $filter;
+        }
+
+        $node = $filter->getNode('node');
+        if ($this->isSafeFor($type, $node, $env)) {
+            return $filter;
+        }
+
+        $filter->setNode('node', $this->getEscaperFilter($type, $node));
+
+        return $filter;
+    }
+
+    protected function isSafeFor($type, Twig_NodeInterface $expression, $env)
+    {
+        $safe = $this->safeAnalysis->getSafe($expression);
+
+        if (null === $safe) {
+            if (null === $this->traverser) {
+                $this->traverser = new Twig_NodeTraverser($env, array($this->safeAnalysis));
+            }
+
+            $this->safeAnalysis->setSafeVars($this->safeVars);
+
+            $this->traverser->traverse($expression);
+            $safe = $this->safeAnalysis->getSafe($expression);
+        }
+
+        return in_array($type, $safe) || in_array('all', $safe);
+    }
+
+    protected function needEscaping(Twig_Environment $env)
+    {
+        if (count($this->statusStack)) {
+            return $this->statusStack[count($this->statusStack) - 1];
+        }
+
+        return $this->defaultStrategy ? $this->defaultStrategy : false;
+    }
+
+    protected function getEscaperFilter($type, Twig_NodeInterface $node)
+    {
+        $line = $node->getLine();
+        $name = new Twig_Node_Expression_Constant('escape', $line);
+        $args = new Twig_Node(array(new Twig_Node_Expression_Constant((string) $type, $line), new Twig_Node_Expression_Constant(null, $line), new Twig_Node_Expression_Constant(true, $line)));
+
+        return new Twig_Node_Expression_Filter($node, $name, $args, $line);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return 0;
+    }
+}
diff --git a/inc/Twig/NodeVisitor/Optimizer.php b/inc/Twig/NodeVisitor/Optimizer.php
new file mode 100644
index 00000000..a254def7
--- /dev/null
+++ b/inc/Twig/NodeVisitor/Optimizer.php
@@ -0,0 +1,246 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_NodeVisitor_Optimizer tries to optimizes the AST.
+ *
+ * This visitor is always the last registered one.
+ *
+ * You can configure which optimizations you want to activate via the
+ * optimizer mode.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_NodeVisitor_Optimizer implements Twig_NodeVisitorInterface
+{
+    const OPTIMIZE_ALL         = -1;
+    const OPTIMIZE_NONE        = 0;
+    const OPTIMIZE_FOR         = 2;
+    const OPTIMIZE_RAW_FILTER  = 4;
+    const OPTIMIZE_VAR_ACCESS  = 8;
+
+    protected $loops = array();
+    protected $optimizers;
+    protected $prependedNodes = array();
+    protected $inABody = false;
+
+    /**
+     * Constructor.
+     *
+     * @param integer $optimizers The optimizer mode
+     */
+    public function __construct($optimizers = -1)
+    {
+        if (!is_int($optimizers) || $optimizers > 2) {
+            throw new InvalidArgumentException(sprintf('Optimizer mode "%s" is not valid.', $optimizers));
+        }
+
+        $this->optimizers = $optimizers;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        if (self::OPTIMIZE_FOR === (self::OPTIMIZE_FOR & $this->optimizers)) {
+            $this->enterOptimizeFor($node, $env);
+        }
+
+        if (!version_compare(phpversion(), '5.4.0RC1', '>=') && self::OPTIMIZE_VAR_ACCESS === (self::OPTIMIZE_VAR_ACCESS & $this->optimizers) && !$env->isStrictVariables() && !$env->hasExtension('sandbox')) {
+            if ($this->inABody) {
+                if (!$node instanceof Twig_Node_Expression) {
+                    if (get_class($node) !== 'Twig_Node') {
+                        array_unshift($this->prependedNodes, array());
+                    }
+                } else {
+                    $node = $this->optimizeVariables($node, $env);
+                }
+            } elseif ($node instanceof Twig_Node_Body) {
+                $this->inABody = true;
+            }
+        }
+
+        return $node;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        $expression = $node instanceof Twig_Node_Expression;
+
+        if (self::OPTIMIZE_FOR === (self::OPTIMIZE_FOR & $this->optimizers)) {
+            $this->leaveOptimizeFor($node, $env);
+        }
+
+        if (self::OPTIMIZE_RAW_FILTER === (self::OPTIMIZE_RAW_FILTER & $this->optimizers)) {
+            $node = $this->optimizeRawFilter($node, $env);
+        }
+
+        $node = $this->optimizePrintNode($node, $env);
+
+        if (self::OPTIMIZE_VAR_ACCESS === (self::OPTIMIZE_VAR_ACCESS & $this->optimizers) && !$env->isStrictVariables() && !$env->hasExtension('sandbox')) {
+            if ($node instanceof Twig_Node_Body) {
+                $this->inABody = false;
+            } elseif ($this->inABody) {
+                if (!$expression && get_class($node) !== 'Twig_Node' && $prependedNodes = array_shift($this->prependedNodes)) {
+                    $nodes = array();
+                    foreach (array_unique($prependedNodes) as $name) {
+                        $nodes[] = new Twig_Node_SetTemp($name, $node->getLine());
+                    }
+
+                    $nodes[] = $node;
+                    $node = new Twig_Node($nodes);
+                }
+            }
+        }
+
+        return $node;
+    }
+
+    protected function optimizeVariables($node, $env)
+    {
+        if ('Twig_Node_Expression_Name' === get_class($node) && $node->isSimple()) {
+            $this->prependedNodes[0][] = $node->getAttribute('name');
+
+            return new Twig_Node_Expression_TempName($node->getAttribute('name'), $node->getLine());
+        }
+
+        return $node;
+    }
+
+    /**
+     * Optimizes print nodes.
+     *
+     * It replaces:
+     *
+     *   * "echo $this->render(Parent)Block()" with "$this->display(Parent)Block()"
+     *
+     * @param Twig_NodeInterface $node A Node
+     * @param Twig_Environment   $env  The current Twig environment
+     */
+    protected function optimizePrintNode($node, $env)
+    {
+        if (!$node instanceof Twig_Node_Print) {
+            return $node;
+        }
+
+        if (
+            $node->getNode('expr') instanceof Twig_Node_Expression_BlockReference ||
+            $node->getNode('expr') instanceof Twig_Node_Expression_Parent
+        ) {
+            $node->getNode('expr')->setAttribute('output', true);
+
+            return $node->getNode('expr');
+        }
+
+        return $node;
+    }
+
+    /**
+     * Removes "raw" filters.
+     *
+     * @param Twig_NodeInterface $node A Node
+     * @param Twig_Environment   $env  The current Twig environment
+     */
+    protected function optimizeRawFilter($node, $env)
+    {
+        if ($node instanceof Twig_Node_Expression_Filter && 'raw' == $node->getNode('filter')->getAttribute('value')) {
+            return $node->getNode('node');
+        }
+
+        return $node;
+    }
+
+    /**
+     * Optimizes "for" tag by removing the "loop" variable creation whenever possible.
+     *
+     * @param Twig_NodeInterface $node A Node
+     * @param Twig_Environment   $env  The current Twig environment
+     */
+    protected function enterOptimizeFor($node, $env)
+    {
+        if ($node instanceof Twig_Node_For) {
+            // disable the loop variable by default
+            $node->setAttribute('with_loop', false);
+            array_unshift($this->loops, $node);
+        } elseif (!$this->loops) {
+            // we are outside a loop
+            return;
+        }
+
+        // when do we need to add the loop variable back?
+
+        // the loop variable is referenced for the current loop
+        elseif ($node instanceof Twig_Node_Expression_Name && 'loop' === $node->getAttribute('name')) {
+            $this->addLoopToCurrent();
+        }
+
+        // block reference
+        elseif ($node instanceof Twig_Node_BlockReference || $node instanceof Twig_Node_Expression_BlockReference) {
+            $this->addLoopToCurrent();
+        }
+
+        // include without the only attribute
+        elseif ($node instanceof Twig_Node_Include && !$node->getAttribute('only')) {
+            $this->addLoopToAll();
+        }
+
+        // the loop variable is referenced via an attribute
+        elseif ($node instanceof Twig_Node_Expression_GetAttr
+            && (!$node->getNode('attribute') instanceof Twig_Node_Expression_Constant
+                || 'parent' === $node->getNode('attribute')->getAttribute('value')
+               )
+            && (true === $this->loops[0]->getAttribute('with_loop')
+                || ($node->getNode('node') instanceof Twig_Node_Expression_Name
+                    && 'loop' === $node->getNode('node')->getAttribute('name')
+                   )
+               )
+        ) {
+            $this->addLoopToAll();
+        }
+    }
+
+    /**
+     * Optimizes "for" tag by removing the "loop" variable creation whenever possible.
+     *
+     * @param Twig_NodeInterface $node A Node
+     * @param Twig_Environment   $env  The current Twig environment
+     */
+    protected function leaveOptimizeFor($node, $env)
+    {
+        if ($node instanceof Twig_Node_For) {
+            array_shift($this->loops);
+        }
+    }
+
+    protected function addLoopToCurrent()
+    {
+        $this->loops[0]->setAttribute('with_loop', true);
+    }
+
+    protected function addLoopToAll()
+    {
+        foreach ($this->loops as $loop) {
+            $loop->setAttribute('with_loop', true);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return 255;
+    }
+}
diff --git a/inc/Twig/NodeVisitor/SafeAnalysis.php b/inc/Twig/NodeVisitor/SafeAnalysis.php
new file mode 100644
index 00000000..c4bbd812
--- /dev/null
+++ b/inc/Twig/NodeVisitor/SafeAnalysis.php
@@ -0,0 +1,131 @@
+<?php
+
+class Twig_NodeVisitor_SafeAnalysis implements Twig_NodeVisitorInterface
+{
+    protected $data = array();
+    protected $safeVars = array();
+
+    public function setSafeVars($safeVars)
+    {
+        $this->safeVars = $safeVars;
+    }
+
+    public function getSafe(Twig_NodeInterface $node)
+    {
+        $hash = spl_object_hash($node);
+        if (isset($this->data[$hash])) {
+            foreach ($this->data[$hash] as $bucket) {
+                if ($bucket['key'] === $node) {
+                    return $bucket['value'];
+                }
+            }
+        }
+    }
+
+    protected function setSafe(Twig_NodeInterface $node, array $safe)
+    {
+        $hash = spl_object_hash($node);
+        if (isset($this->data[$hash])) {
+            foreach ($this->data[$hash] as &$bucket) {
+                if ($bucket['key'] === $node) {
+                    $bucket['value'] = $safe;
+
+                    return;
+                }
+            }
+        }
+        $this->data[$hash][] = array(
+            'key' => $node,
+            'value' => $safe,
+        );
+    }
+
+    public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        return $node;
+    }
+
+    public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Expression_Constant) {
+            // constants are marked safe for all
+            $this->setSafe($node, array('all'));
+        } elseif ($node instanceof Twig_Node_Expression_BlockReference) {
+            // blocks are safe by definition
+            $this->setSafe($node, array('all'));
+        } elseif ($node instanceof Twig_Node_Expression_Parent) {
+            // parent block is safe by definition
+            $this->setSafe($node, array('all'));
+        } elseif ($node instanceof Twig_Node_Expression_Conditional) {
+            // intersect safeness of both operands
+            $safe = $this->intersectSafe($this->getSafe($node->getNode('expr2')), $this->getSafe($node->getNode('expr3')));
+            $this->setSafe($node, $safe);
+        } elseif ($node instanceof Twig_Node_Expression_Filter) {
+            // filter expression is safe when the filter is safe
+            $name = $node->getNode('filter')->getAttribute('value');
+            $args = $node->getNode('arguments');
+            if (false !== $filter = $env->getFilter($name)) {
+                $safe = $filter->getSafe($args);
+                if (null === $safe) {
+                    $safe = $this->intersectSafe($this->getSafe($node->getNode('node')), $filter->getPreservesSafety());
+                }
+                $this->setSafe($node, $safe);
+            } else {
+                $this->setSafe($node, array());
+            }
+        } elseif ($node instanceof Twig_Node_Expression_Function) {
+            // function expression is safe when the function is safe
+            $name = $node->getAttribute('name');
+            $args = $node->getNode('arguments');
+            $function = $env->getFunction($name);
+            if (false !== $function) {
+                $this->setSafe($node, $function->getSafe($args));
+            } else {
+                $this->setSafe($node, array());
+            }
+        } elseif ($node instanceof Twig_Node_Expression_MethodCall) {
+            if ($node->getAttribute('safe')) {
+                $this->setSafe($node, array('all'));
+            } else {
+                $this->setSafe($node, array());
+            }
+        } elseif ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name) {
+            $name = $node->getNode('node')->getAttribute('name');
+            // attributes on template instances are safe
+            if ('_self' == $name || in_array($name, $this->safeVars)) {
+                $this->setSafe($node, array('all'));
+            } else {
+                $this->setSafe($node, array());
+            }
+        } else {
+            $this->setSafe($node, array());
+        }
+
+        return $node;
+    }
+
+    protected function intersectSafe(array $a = null, array $b = null)
+    {
+        if (null === $a || null === $b) {
+            return array();
+        }
+
+        if (in_array('all', $a)) {
+            return $b;
+        }
+
+        if (in_array('all', $b)) {
+            return $a;
+        }
+
+        return array_intersect($a, $b);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return 0;
+    }
+}
diff --git a/inc/Twig/NodeVisitor/Sandbox.php b/inc/Twig/NodeVisitor/Sandbox.php
new file mode 100644
index 00000000..fb27045b
--- /dev/null
+++ b/inc/Twig/NodeVisitor/Sandbox.php
@@ -0,0 +1,92 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_NodeVisitor_Sandbox implements sandboxing.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_NodeVisitor_Sandbox implements Twig_NodeVisitorInterface
+{
+    protected $inAModule = false;
+    protected $tags;
+    protected $filters;
+    protected $functions;
+
+    /**
+     * Called before child nodes are visited.
+     *
+     * @param Twig_NodeInterface $node The node to visit
+     * @param Twig_Environment   $env  The Twig environment instance
+     *
+     * @return Twig_NodeInterface The modified node
+     */
+    public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Module) {
+            $this->inAModule = true;
+            $this->tags = array();
+            $this->filters = array();
+            $this->functions = array();
+
+            return $node;
+        } elseif ($this->inAModule) {
+            // look for tags
+            if ($node->getNodeTag()) {
+                $this->tags[] = $node->getNodeTag();
+            }
+
+            // look for filters
+            if ($node instanceof Twig_Node_Expression_Filter) {
+                $this->filters[] = $node->getNode('filter')->getAttribute('value');
+            }
+
+            // look for functions
+            if ($node instanceof Twig_Node_Expression_Function) {
+                $this->functions[] = $node->getAttribute('name');
+            }
+
+            // wrap print to check __toString() calls
+            if ($node instanceof Twig_Node_Print) {
+                return new Twig_Node_SandboxedPrint($node->getNode('expr'), $node->getLine(), $node->getNodeTag());
+            }
+        }
+
+        return $node;
+    }
+
+    /**
+     * Called after child nodes are visited.
+     *
+     * @param Twig_NodeInterface $node The node to visit
+     * @param Twig_Environment   $env  The Twig environment instance
+     *
+     * @return Twig_NodeInterface The modified node
+     */
+    public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
+    {
+        if ($node instanceof Twig_Node_Module) {
+            $this->inAModule = false;
+
+            return new Twig_Node_SandboxedModule($node, array_unique($this->filters), array_unique($this->tags), array_unique($this->functions));
+        }
+
+        return $node;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getPriority()
+    {
+        return 0;
+    }
+}
diff --git a/inc/Twig/NodeVisitorInterface.php b/inc/Twig/NodeVisitorInterface.php
new file mode 100644
index 00000000..f33c13fc
--- /dev/null
+++ b/inc/Twig/NodeVisitorInterface.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Twig_NodeVisitorInterface is the interface the all node visitor classes must implement.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_NodeVisitorInterface
+{
+    /**
+     * Called before child nodes are visited.
+     *
+     * @param Twig_NodeInterface $node The node to visit
+     * @param Twig_Environment   $env  The Twig environment instance
+     *
+     * @return Twig_NodeInterface The modified node
+     */
+    public function enterNode(Twig_NodeInterface $node, Twig_Environment $env);
+
+    /**
+     * Called after child nodes are visited.
+     *
+     * @param Twig_NodeInterface $node The node to visit
+     * @param Twig_Environment   $env  The Twig environment instance
+     *
+     * @return Twig_NodeInterface|false The modified node or false if the node must be removed
+     */
+    public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env);
+
+    /**
+     * Returns the priority for this visitor.
+     *
+     * Priority should be between -10 and 10 (0 is the default).
+     *
+     * @return integer The priority level
+     */
+    public function getPriority();
+}
diff --git a/inc/Twig/Parser.php b/inc/Twig/Parser.php
new file mode 100644
index 00000000..958e46b3
--- /dev/null
+++ b/inc/Twig/Parser.php
@@ -0,0 +1,394 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Default parser implementation.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Parser implements Twig_ParserInterface
+{
+    protected $stack = array();
+    protected $stream;
+    protected $parent;
+    protected $handlers;
+    protected $visitors;
+    protected $expressionParser;
+    protected $blocks;
+    protected $blockStack;
+    protected $macros;
+    protected $env;
+    protected $reservedMacroNames;
+    protected $importedSymbols;
+    protected $traits;
+    protected $embeddedTemplates = array();
+
+    /**
+     * Constructor.
+     *
+     * @param Twig_Environment $env A Twig_Environment instance
+     */
+    public function __construct(Twig_Environment $env)
+    {
+        $this->env = $env;
+    }
+
+    public function getEnvironment()
+    {
+        return $this->env;
+    }
+
+    public function getVarName()
+    {
+        return sprintf('__internal_%s', hash('sha1', uniqid(mt_rand(), true), false));
+    }
+
+    public function getFilename()
+    {
+        return $this->stream->getFilename();
+    }
+
+    /**
+     * Converts a token stream to a node tree.
+     *
+     * @param Twig_TokenStream $stream A token stream instance
+     *
+     * @return Twig_Node_Module A node tree
+     */
+    public function parse(Twig_TokenStream $stream, $test = null, $dropNeedle = false)
+    {
+        // push all variables into the stack to keep the current state of the parser
+        $vars = get_object_vars($this);
+        unset($vars['stack'], $vars['env'], $vars['handlers'], $vars['visitors'], $vars['expressionParser']);
+        $this->stack[] = $vars;
+
+        // tag handlers
+        if (null === $this->handlers) {
+            $this->handlers = $this->env->getTokenParsers();
+            $this->handlers->setParser($this);
+        }
+
+        // node visitors
+        if (null === $this->visitors) {
+            $this->visitors = $this->env->getNodeVisitors();
+        }
+
+        if (null === $this->expressionParser) {
+            $this->expressionParser = new Twig_ExpressionParser($this, $this->env->getUnaryOperators(), $this->env->getBinaryOperators());
+        }
+
+        $this->stream = $stream;
+        $this->parent = null;
+        $this->blocks = array();
+        $this->macros = array();
+        $this->traits = array();
+        $this->blockStack = array();
+        $this->importedSymbols = array(array());
+        $this->embeddedTemplates = array();
+
+        try {
+            $body = $this->subparse($test, $dropNeedle);
+
+            if (null !== $this->parent) {
+                if (null === $body = $this->filterBodyNodes($body)) {
+                    $body = new Twig_Node();
+                }
+            }
+        } catch (Twig_Error_Syntax $e) {
+            if (!$e->getTemplateFile()) {
+                $e->setTemplateFile($this->getFilename());
+            }
+
+            if (!$e->getTemplateLine()) {
+                $e->setTemplateLine($this->stream->getCurrent()->getLine());
+            }
+
+            throw $e;
+        }
+
+        $node = new Twig_Node_Module(new Twig_Node_Body(array($body)), $this->parent, new Twig_Node($this->blocks), new Twig_Node($this->macros), new Twig_Node($this->traits), $this->embeddedTemplates, $this->getFilename());
+
+        $traverser = new Twig_NodeTraverser($this->env, $this->visitors);
+
+        $node = $traverser->traverse($node);
+
+        // restore previous stack so previous parse() call can resume working
+        foreach (array_pop($this->stack) as $key => $val) {
+            $this->$key = $val;
+        }
+
+        return $node;
+    }
+
+    public function subparse($test, $dropNeedle = false)
+    {
+        $lineno = $this->getCurrentToken()->getLine();
+        $rv = array();
+        while (!$this->stream->isEOF()) {
+            switch ($this->getCurrentToken()->getType()) {
+                case Twig_Token::TEXT_TYPE:
+                    $token = $this->stream->next();
+                    $rv[] = new Twig_Node_Text($token->getValue(), $token->getLine());
+                    break;
+
+                case Twig_Token::VAR_START_TYPE:
+                    $token = $this->stream->next();
+                    $expr = $this->expressionParser->parseExpression();
+                    $this->stream->expect(Twig_Token::VAR_END_TYPE);
+                    $rv[] = new Twig_Node_Print($expr, $token->getLine());
+                    break;
+
+                case Twig_Token::BLOCK_START_TYPE:
+                    $this->stream->next();
+                    $token = $this->getCurrentToken();
+
+                    if ($token->getType() !== Twig_Token::NAME_TYPE) {
+                        throw new Twig_Error_Syntax('A block must start with a tag name', $token->getLine(), $this->getFilename());
+                    }
+
+                    if (null !== $test && call_user_func($test, $token)) {
+                        if ($dropNeedle) {
+                            $this->stream->next();
+                        }
+
+                        if (1 === count($rv)) {
+                            return $rv[0];
+                        }
+
+                        return new Twig_Node($rv, array(), $lineno);
+                    }
+
+                    $subparser = $this->handlers->getTokenParser($token->getValue());
+                    if (null === $subparser) {
+                        if (null !== $test) {
+                            $error = sprintf('Unexpected tag name "%s"', $token->getValue());
+                            if (is_array($test) && isset($test[0]) && $test[0] instanceof Twig_TokenParserInterface) {
+                                $error .= sprintf(' (expecting closing tag for the "%s" tag defined near line %s)', $test[0]->getTag(), $lineno);
+                            }
+
+                            throw new Twig_Error_Syntax($error, $token->getLine(), $this->getFilename());
+                        }
+
+                        $message = sprintf('Unknown tag name "%s"', $token->getValue());
+                        if ($alternatives = $this->env->computeAlternatives($token->getValue(), array_keys($this->env->getTags()))) {
+                            $message = sprintf('%s. Did you mean "%s"', $message, implode('", "', $alternatives));
+                        }
+
+                        throw new Twig_Error_Syntax($message, $token->getLine(), $this->getFilename());
+                    }
+
+                    $this->stream->next();
+
+                    $node = $subparser->parse($token);
+                    if (null !== $node) {
+                        $rv[] = $node;
+                    }
+                    break;
+
+                default:
+                    throw new Twig_Error_Syntax('Lexer or parser ended up in unsupported state.', 0, $this->getFilename());
+            }
+        }
+
+        if (1 === count($rv)) {
+            return $rv[0];
+        }
+
+        return new Twig_Node($rv, array(), $lineno);
+    }
+
+    public function addHandler($name, $class)
+    {
+        $this->handlers[$name] = $class;
+    }
+
+    public function addNodeVisitor(Twig_NodeVisitorInterface $visitor)
+    {
+        $this->visitors[] = $visitor;
+    }
+
+    public function getBlockStack()
+    {
+        return $this->blockStack;
+    }
+
+    public function peekBlockStack()
+    {
+        return $this->blockStack[count($this->blockStack) - 1];
+    }
+
+    public function popBlockStack()
+    {
+        array_pop($this->blockStack);
+    }
+
+    public function pushBlockStack($name)
+    {
+        $this->blockStack[] = $name;
+    }
+
+    public function hasBlock($name)
+    {
+        return isset($this->blocks[$name]);
+    }
+
+    public function getBlock($name)
+    {
+        return $this->blocks[$name];
+    }
+
+    public function setBlock($name, $value)
+    {
+        $this->blocks[$name] = new Twig_Node_Body(array($value), array(), $value->getLine());
+    }
+
+    public function hasMacro($name)
+    {
+        return isset($this->macros[$name]);
+    }
+
+    public function setMacro($name, Twig_Node_Macro $node)
+    {
+        if (null === $this->reservedMacroNames) {
+            $this->reservedMacroNames = array();
+            $r = new ReflectionClass($this->env->getBaseTemplateClass());
+            foreach ($r->getMethods() as $method) {
+                $this->reservedMacroNames[] = $method->getName();
+            }
+        }
+
+        if (in_array($name, $this->reservedMacroNames)) {
+            throw new Twig_Error_Syntax(sprintf('"%s" cannot be used as a macro name as it is a reserved keyword', $name), $node->getLine(), $this->getFilename());
+        }
+
+        $this->macros[$name] = $node;
+    }
+
+    public function addTrait($trait)
+    {
+        $this->traits[] = $trait;
+    }
+
+    public function hasTraits()
+    {
+        return count($this->traits) > 0;
+    }
+
+    public function embedTemplate(Twig_Node_Module $template)
+    {
+        $template->setIndex(mt_rand());
+
+        $this->embeddedTemplates[] = $template;
+    }
+
+    public function addImportedSymbol($type, $alias, $name = null, Twig_Node_Expression $node = null)
+    {
+        $this->importedSymbols[0][$type][$alias] = array('name' => $name, 'node' => $node);
+    }
+
+    public function getImportedSymbol($type, $alias)
+    {
+        foreach ($this->importedSymbols as $functions) {
+            if (isset($functions[$type][$alias])) {
+                return $functions[$type][$alias];
+            }
+        }
+    }
+
+    public function isMainScope()
+    {
+        return 1 === count($this->importedSymbols);
+    }
+
+    public function pushLocalScope()
+    {
+        array_unshift($this->importedSymbols, array());
+    }
+
+    public function popLocalScope()
+    {
+        array_shift($this->importedSymbols);
+    }
+
+    /**
+     * Gets the expression parser.
+     *
+     * @return Twig_ExpressionParser The expression parser
+     */
+    public function getExpressionParser()
+    {
+        return $this->expressionParser;
+    }
+
+    public function getParent()
+    {
+        return $this->parent;
+    }
+
+    public function setParent($parent)
+    {
+        $this->parent = $parent;
+    }
+
+    /**
+     * Gets the token stream.
+     *
+     * @return Twig_TokenStream The token stream
+     */
+    public function getStream()
+    {
+        return $this->stream;
+    }
+
+    /**
+     * Gets the current token.
+     *
+     * @return Twig_Token The current token
+     */
+    public function getCurrentToken()
+    {
+        return $this->stream->getCurrent();
+    }
+
+    protected function filterBodyNodes(Twig_NodeInterface $node)
+    {
+        // check that the body does not contain non-empty output nodes
+        if (
+            ($node instanceof Twig_Node_Text && !ctype_space($node->getAttribute('data')))
+            ||
+            (!$node instanceof Twig_Node_Text && !$node instanceof Twig_Node_BlockReference && $node instanceof Twig_NodeOutputInterface)
+        ) {
+            if (false !== strpos((string) $node, chr(0xEF).chr(0xBB).chr(0xBF))) {
+                throw new Twig_Error_Syntax('A template that extends another one cannot have a body but a byte order mark (BOM) has been detected; it must be removed.', $node->getLine(), $this->getFilename());
+            }
+
+            throw new Twig_Error_Syntax('A template that extends another one cannot have a body.', $node->getLine(), $this->getFilename());
+        }
+
+        // bypass "set" nodes as they "capture" the output
+        if ($node instanceof Twig_Node_Set) {
+            return $node;
+        }
+
+        if ($node instanceof Twig_NodeOutputInterface) {
+            return;
+        }
+
+        foreach ($node as $k => $n) {
+            if (null !== $n && null === $n = $this->filterBodyNodes($n)) {
+                $node->removeNode($k);
+            }
+        }
+
+        return $node;
+    }
+}
diff --git a/inc/Twig/ParserInterface.php b/inc/Twig/ParserInterface.php
new file mode 100644
index 00000000..f0d79009
--- /dev/null
+++ b/inc/Twig/ParserInterface.php
@@ -0,0 +1,28 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by parser classes.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_ParserInterface
+{
+    /**
+     * Converts a token stream to a node tree.
+     *
+     * @param Twig_TokenStream $stream A token stream instance
+     *
+     * @return Twig_Node_Module A node tree
+     */
+    public function parse(Twig_TokenStream $stream);
+}
diff --git a/inc/Twig/Sandbox/SecurityError.php b/inc/Twig/Sandbox/SecurityError.php
new file mode 100644
index 00000000..015bfaea
--- /dev/null
+++ b/inc/Twig/Sandbox/SecurityError.php
@@ -0,0 +1,19 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Exception thrown when a security error occurs at runtime.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Sandbox_SecurityError extends Twig_Error
+{
+}
diff --git a/inc/Twig/Sandbox/SecurityPolicy.php b/inc/Twig/Sandbox/SecurityPolicy.php
new file mode 100644
index 00000000..66ee2332
--- /dev/null
+++ b/inc/Twig/Sandbox/SecurityPolicy.php
@@ -0,0 +1,119 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a security policy which need to be enforced when sandbox mode is enabled.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Sandbox_SecurityPolicy implements Twig_Sandbox_SecurityPolicyInterface
+{
+    protected $allowedTags;
+    protected $allowedFilters;
+    protected $allowedMethods;
+    protected $allowedProperties;
+    protected $allowedFunctions;
+
+    public function __construct(array $allowedTags = array(), array $allowedFilters = array(), array $allowedMethods = array(), array $allowedProperties = array(), array $allowedFunctions = array())
+    {
+        $this->allowedTags = $allowedTags;
+        $this->allowedFilters = $allowedFilters;
+        $this->setAllowedMethods($allowedMethods);
+        $this->allowedProperties = $allowedProperties;
+        $this->allowedFunctions = $allowedFunctions;
+    }
+
+    public function setAllowedTags(array $tags)
+    {
+        $this->allowedTags = $tags;
+    }
+
+    public function setAllowedFilters(array $filters)
+    {
+        $this->allowedFilters = $filters;
+    }
+
+    public function setAllowedMethods(array $methods)
+    {
+        $this->allowedMethods = array();
+        foreach ($methods as $class => $m) {
+            $this->allowedMethods[$class] = array_map('strtolower', is_array($m) ? $m : array($m));
+        }
+    }
+
+    public function setAllowedProperties(array $properties)
+    {
+        $this->allowedProperties = $properties;
+    }
+
+    public function setAllowedFunctions(array $functions)
+    {
+        $this->allowedFunctions = $functions;
+    }
+
+    public function checkSecurity($tags, $filters, $functions)
+    {
+        foreach ($tags as $tag) {
+            if (!in_array($tag, $this->allowedTags)) {
+                throw new Twig_Sandbox_SecurityError(sprintf('Tag "%s" is not allowed.', $tag));
+            }
+        }
+
+        foreach ($filters as $filter) {
+            if (!in_array($filter, $this->allowedFilters)) {
+                throw new Twig_Sandbox_SecurityError(sprintf('Filter "%s" is not allowed.', $filter));
+            }
+        }
+
+        foreach ($functions as $function) {
+            if (!in_array($function, $this->allowedFunctions)) {
+                throw new Twig_Sandbox_SecurityError(sprintf('Function "%s" is not allowed.', $function));
+            }
+        }
+    }
+
+    public function checkMethodAllowed($obj, $method)
+    {
+        if ($obj instanceof Twig_TemplateInterface || $obj instanceof Twig_Markup) {
+            return true;
+        }
+
+        $allowed = false;
+        $method = strtolower($method);
+        foreach ($this->allowedMethods as $class => $methods) {
+            if ($obj instanceof $class) {
+                $allowed = in_array($method, $methods);
+
+                break;
+            }
+        }
+
+        if (!$allowed) {
+            throw new Twig_Sandbox_SecurityError(sprintf('Calling "%s" method on a "%s" object is not allowed.', $method, get_class($obj)));
+        }
+    }
+
+    public function checkPropertyAllowed($obj, $property)
+    {
+        $allowed = false;
+        foreach ($this->allowedProperties as $class => $properties) {
+            if ($obj instanceof $class) {
+                $allowed = in_array($property, is_array($properties) ? $properties : array($properties));
+
+                break;
+            }
+        }
+
+        if (!$allowed) {
+            throw new Twig_Sandbox_SecurityError(sprintf('Calling "%s" property on a "%s" object is not allowed.', $property, get_class($obj)));
+        }
+    }
+}
diff --git a/inc/Twig/Sandbox/SecurityPolicyInterface.php b/inc/Twig/Sandbox/SecurityPolicyInterface.php
new file mode 100644
index 00000000..6ab48e3c
--- /dev/null
+++ b/inc/Twig/Sandbox/SecurityPolicyInterface.php
@@ -0,0 +1,24 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interfaces that all security policy classes must implements.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_Sandbox_SecurityPolicyInterface
+{
+    public function checkSecurity($tags, $filters, $functions);
+
+    public function checkMethodAllowed($obj, $method);
+
+    public function checkPropertyAllowed($obj, $method);
+}
diff --git a/inc/Twig/SimpleFilter.php b/inc/Twig/SimpleFilter.php
new file mode 100644
index 00000000..d35c5633
--- /dev/null
+++ b/inc/Twig/SimpleFilter.php
@@ -0,0 +1,94 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009-2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template filter.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_SimpleFilter
+{
+    protected $name;
+    protected $callable;
+    protected $options;
+    protected $arguments = array();
+
+    public function __construct($name, $callable, array $options = array())
+    {
+        $this->name = $name;
+        $this->callable = $callable;
+        $this->options = array_merge(array(
+            'needs_environment' => false,
+            'needs_context'     => false,
+            'is_safe'           => null,
+            'is_safe_callback'  => null,
+            'pre_escape'        => null,
+            'preserves_safety'  => null,
+            'node_class'        => 'Twig_Node_Expression_Filter',
+        ), $options);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getCallable()
+    {
+        return $this->callable;
+    }
+
+    public function getNodeClass()
+    {
+        return $this->options['node_class'];
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    public function needsEnvironment()
+    {
+        return $this->options['needs_environment'];
+    }
+
+    public function needsContext()
+    {
+        return $this->options['needs_context'];
+    }
+
+    public function getSafe(Twig_Node $filterArgs)
+    {
+        if (null !== $this->options['is_safe']) {
+            return $this->options['is_safe'];
+        }
+
+        if (null !== $this->options['is_safe_callback']) {
+            return call_user_func($this->options['is_safe_callback'], $filterArgs);
+        }
+    }
+
+    public function getPreservesSafety()
+    {
+        return $this->options['preserves_safety'];
+    }
+
+    public function getPreEscape()
+    {
+        return $this->options['pre_escape'];
+    }
+}
diff --git a/inc/Twig/SimpleFunction.php b/inc/Twig/SimpleFunction.php
new file mode 100644
index 00000000..8ef6aca2
--- /dev/null
+++ b/inc/Twig/SimpleFunction.php
@@ -0,0 +1,84 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010-2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template function.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_SimpleFunction
+{
+    protected $name;
+    protected $callable;
+    protected $options;
+    protected $arguments = array();
+
+    public function __construct($name, $callable, array $options = array())
+    {
+        $this->name = $name;
+        $this->callable = $callable;
+        $this->options = array_merge(array(
+            'needs_environment' => false,
+            'needs_context'     => false,
+            'is_safe'           => null,
+            'is_safe_callback'  => null,
+            'node_class'        => 'Twig_Node_Expression_Function',
+        ), $options);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getCallable()
+    {
+        return $this->callable;
+    }
+
+    public function getNodeClass()
+    {
+        return $this->options['node_class'];
+    }
+
+    public function setArguments($arguments)
+    {
+        $this->arguments = $arguments;
+    }
+
+    public function getArguments()
+    {
+        return $this->arguments;
+    }
+
+    public function needsEnvironment()
+    {
+        return $this->options['needs_environment'];
+    }
+
+    public function needsContext()
+    {
+        return $this->options['needs_context'];
+    }
+
+    public function getSafe(Twig_Node $functionArgs)
+    {
+        if (null !== $this->options['is_safe']) {
+            return $this->options['is_safe'];
+        }
+
+        if (null !== $this->options['is_safe_callback']) {
+            return call_user_func($this->options['is_safe_callback'], $functionArgs);
+        }
+
+        return array();
+    }
+}
diff --git a/inc/Twig/SimpleTest.php b/inc/Twig/SimpleTest.php
new file mode 100644
index 00000000..225459c9
--- /dev/null
+++ b/inc/Twig/SimpleTest.php
@@ -0,0 +1,46 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010-2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template test.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_SimpleTest
+{
+    protected $name;
+    protected $callable;
+    protected $options;
+
+    public function __construct($name, $callable, array $options = array())
+    {
+        $this->name = $name;
+        $this->callable = $callable;
+        $this->options = array_merge(array(
+            'node_class' => 'Twig_Node_Expression_Test',
+        ), $options);
+    }
+
+    public function getName()
+    {
+        return $this->name;
+    }
+
+    public function getCallable()
+    {
+        return $this->callable;
+    }
+
+    public function getNodeClass()
+    {
+        return $this->options['node_class'];
+    }
+}
diff --git a/inc/Twig/Template.php b/inc/Twig/Template.php
new file mode 100644
index 00000000..a001ca03
--- /dev/null
+++ b/inc/Twig/Template.php
@@ -0,0 +1,455 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Default base class for compiled templates.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Twig_Template implements Twig_TemplateInterface
+{
+    protected static $cache = array();
+
+    protected $parent;
+    protected $parents;
+    protected $env;
+    protected $blocks;
+    protected $traits;
+
+    /**
+     * Constructor.
+     *
+     * @param Twig_Environment $env A Twig_Environment instance
+     */
+    public function __construct(Twig_Environment $env)
+    {
+        $this->env = $env;
+        $this->blocks = array();
+        $this->traits = array();
+    }
+
+    /**
+     * Returns the template name.
+     *
+     * @return string The template name
+     */
+    abstract public function getTemplateName();
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getEnvironment()
+    {
+        return $this->env;
+    }
+
+    /**
+     * Returns the parent template.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @return Twig_TemplateInterface|false The parent template or false if there is no parent
+     */
+    public function getParent(array $context)
+    {
+        if (null !== $this->parent) {
+            return $this->parent;
+        }
+
+        $parent = $this->doGetParent($context);
+        if (false === $parent) {
+            return false;
+        } elseif ($parent instanceof Twig_Template) {
+            $name = $parent->getTemplateName();
+            $this->parents[$name] = $parent;
+            $parent = $name;
+        } elseif (!isset($this->parents[$parent])) {
+            $this->parents[$parent] = $this->env->loadTemplate($parent);
+        }
+
+        return $this->parents[$parent];
+    }
+
+    protected function doGetParent(array $context)
+    {
+        return false;
+    }
+
+    public function isTraitable()
+    {
+        return true;
+    }
+
+    /**
+     * Displays a parent block.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @param string $name    The block name to display from the parent
+     * @param array  $context The context
+     * @param array  $blocks  The current set of blocks
+     */
+    public function displayParentBlock($name, array $context, array $blocks = array())
+    {
+        $name = (string) $name;
+
+        if (isset($this->traits[$name])) {
+            $this->traits[$name][0]->displayBlock($name, $context, $blocks);
+        } elseif (false !== $parent = $this->getParent($context)) {
+            $parent->displayBlock($name, $context, $blocks);
+        } else {
+            throw new Twig_Error_Runtime(sprintf('The template has no parent and no traits defining the "%s" block', $name), -1, $this->getTemplateName());
+        }
+    }
+
+    /**
+     * Displays a block.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @param string $name    The block name to display
+     * @param array  $context The context
+     * @param array  $blocks  The current set of blocks
+     */
+    public function displayBlock($name, array $context, array $blocks = array())
+    {
+        $name = (string) $name;
+
+        if (isset($blocks[$name])) {
+            $b = $blocks;
+            unset($b[$name]);
+            call_user_func($blocks[$name], $context, $b);
+        } elseif (isset($this->blocks[$name])) {
+            call_user_func($this->blocks[$name], $context, $blocks);
+        } elseif (false !== $parent = $this->getParent($context)) {
+            $parent->displayBlock($name, $context, array_merge($this->blocks, $blocks));
+        }
+    }
+
+    /**
+     * Renders a parent block.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @param string $name    The block name to render from the parent
+     * @param array  $context The context
+     * @param array  $blocks  The current set of blocks
+     *
+     * @return string The rendered block
+     */
+    public function renderParentBlock($name, array $context, array $blocks = array())
+    {
+        ob_start();
+        $this->displayParentBlock($name, $context, $blocks);
+
+        return ob_get_clean();
+    }
+
+    /**
+     * Renders a block.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @param string $name    The block name to render
+     * @param array  $context The context
+     * @param array  $blocks  The current set of blocks
+     *
+     * @return string The rendered block
+     */
+    public function renderBlock($name, array $context, array $blocks = array())
+    {
+        ob_start();
+        $this->displayBlock($name, $context, $blocks);
+
+        return ob_get_clean();
+    }
+
+    /**
+     * Returns whether a block exists or not.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * This method does only return blocks defined in the current template
+     * or defined in "used" traits.
+     *
+     * It does not return blocks from parent templates as the parent
+     * template name can be dynamic, which is only known based on the
+     * current context.
+     *
+     * @param string $name The block name
+     *
+     * @return Boolean true if the block exists, false otherwise
+     */
+    public function hasBlock($name)
+    {
+        return isset($this->blocks[(string) $name]);
+    }
+
+    /**
+     * Returns all block names.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @return array An array of block names
+     *
+     * @see hasBlock
+     */
+    public function getBlockNames()
+    {
+        return array_keys($this->blocks);
+    }
+
+    /**
+     * Returns all blocks.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * @return array An array of blocks
+     *
+     * @see hasBlock
+     */
+    public function getBlocks()
+    {
+        return $this->blocks;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function display(array $context, array $blocks = array())
+    {
+        $this->displayWithErrorHandling($this->env->mergeGlobals($context), $blocks);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function render(array $context)
+    {
+        $level = ob_get_level();
+        ob_start();
+        try {
+            $this->display($context);
+        } catch (Exception $e) {
+            while (ob_get_level() > $level) {
+                ob_end_clean();
+            }
+
+            throw $e;
+        }
+
+        return ob_get_clean();
+    }
+
+    protected function displayWithErrorHandling(array $context, array $blocks = array())
+    {
+        try {
+            $this->doDisplay($context, $blocks);
+        } catch (Twig_Error $e) {
+            if (!$e->getTemplateFile()) {
+                $e->setTemplateFile($this->getTemplateName());
+            }
+
+            // this is mostly useful for Twig_Error_Loader exceptions
+            // see Twig_Error_Loader
+            if (false === $e->getTemplateLine()) {
+                $e->setTemplateLine(-1);
+                $e->guess();
+            }
+
+            throw $e;
+        } catch (Exception $e) {
+            throw new Twig_Error_Runtime(sprintf('An exception has been thrown during the rendering of a template ("%s").', $e->getMessage()), -1, null, $e);
+        }
+    }
+
+    /**
+     * Auto-generated method to display the template with the given context.
+     *
+     * @param array $context An array of parameters to pass to the template
+     * @param array $blocks  An array of blocks to pass to the template
+     */
+    abstract protected function doDisplay(array $context, array $blocks = array());
+
+    /**
+     * Returns a variable from the context.
+     *
+     * This method is for internal use only and should never be called
+     * directly.
+     *
+     * This method should not be overridden in a sub-class as this is an
+     * implementation detail that has been introduced to optimize variable
+     * access for versions of PHP before 5.4. This is not a way to override
+     * the way to get a variable value.
+     *
+     * @param array   $context           The context
+     * @param string  $item              The variable to return from the context
+     * @param Boolean $ignoreStrictCheck Whether to ignore the strict variable check or not
+     *
+     * @return The content of the context variable
+     *
+     * @throws Twig_Error_Runtime if the variable does not exist and Twig is running in strict mode
+     */
+    final protected function getContext($context, $item, $ignoreStrictCheck = false)
+    {
+        if (!array_key_exists($item, $context)) {
+            if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
+                return null;
+            }
+
+            throw new Twig_Error_Runtime(sprintf('Variable "%s" does not exist', $item), -1, $this->getTemplateName());
+        }
+
+        return $context[$item];
+    }
+
+    /**
+     * Returns the attribute value for a given array/object.
+     *
+     * @param mixed   $object            The object or array from where to get the item
+     * @param mixed   $item              The item to get from the array or object
+     * @param array   $arguments         An array of arguments to pass if the item is an object method
+     * @param string  $type              The type of attribute (@see Twig_TemplateInterface)
+     * @param Boolean $isDefinedTest     Whether this is only a defined check
+     * @param Boolean $ignoreStrictCheck Whether to ignore the strict attribute check or not
+     *
+     * @return mixed The attribute value, or a Boolean when $isDefinedTest is true, or null when the attribute is not set and $ignoreStrictCheck is true
+     *
+     * @throws Twig_Error_Runtime if the attribute does not exist and Twig is running in strict mode and $isDefinedTest is false
+     */
+    protected function getAttribute($object, $item, array $arguments = array(), $type = Twig_TemplateInterface::ANY_CALL, $isDefinedTest = false, $ignoreStrictCheck = false)
+    {
+        // array
+        if (Twig_TemplateInterface::METHOD_CALL !== $type) {
+            $arrayItem = is_bool($item) || is_float($item) ? (int) $item : $item;
+
+            if ((is_array($object) && array_key_exists($arrayItem, $object))
+                || ($object instanceof ArrayAccess && isset($object[$arrayItem]))
+            ) {
+                if ($isDefinedTest) {
+                    return true;
+                }
+
+                return $object[$arrayItem];
+            }
+
+            if (Twig_TemplateInterface::ARRAY_CALL === $type || !is_object($object)) {
+                if ($isDefinedTest) {
+                    return false;
+                }
+
+                if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
+                    return null;
+                }
+
+                if (is_object($object)) {
+                    throw new Twig_Error_Runtime(sprintf('Key "%s" in object (with ArrayAccess) of type "%s" does not exist', $arrayItem, get_class($object)), -1, $this->getTemplateName());
+                } elseif (is_array($object)) {
+                    throw new Twig_Error_Runtime(sprintf('Key "%s" for array with keys "%s" does not exist', $arrayItem, implode(', ', array_keys($object))), -1, $this->getTemplateName());
+                } elseif (Twig_TemplateInterface::ARRAY_CALL === $type) {
+                    throw new Twig_Error_Runtime(sprintf('Impossible to access a key ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
+                } else {
+                    throw new Twig_Error_Runtime(sprintf('Impossible to access an attribute ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
+                }
+            }
+        }
+
+        if (!is_object($object)) {
+            if ($isDefinedTest) {
+                return false;
+            }
+
+            if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
+                return null;
+            }
+
+            throw new Twig_Error_Runtime(sprintf('Impossible to invoke a method ("%s") on a %s variable ("%s")', $item, gettype($object), $object), -1, $this->getTemplateName());
+        }
+
+        $class = get_class($object);
+
+        // object property
+        if (Twig_TemplateInterface::METHOD_CALL !== $type) {
+            if (isset($object->$item) || array_key_exists((string) $item, $object)) {
+                if ($isDefinedTest) {
+                    return true;
+                }
+
+                if ($this->env->hasExtension('sandbox')) {
+                    $this->env->getExtension('sandbox')->checkPropertyAllowed($object, $item);
+                }
+
+                return $object->$item;
+            }
+        }
+
+        // object method
+        if (!isset(self::$cache[$class]['methods'])) {
+            self::$cache[$class]['methods'] = array_change_key_case(array_flip(get_class_methods($object)));
+        }
+
+        $lcItem = strtolower($item);
+        if (isset(self::$cache[$class]['methods'][$lcItem])) {
+            $method = (string) $item;
+        } elseif (isset(self::$cache[$class]['methods']['get'.$lcItem])) {
+            $method = 'get'.$item;
+        } elseif (isset(self::$cache[$class]['methods']['is'.$lcItem])) {
+            $method = 'is'.$item;
+        } elseif (isset(self::$cache[$class]['methods']['__call'])) {
+            $method = (string) $item;
+        } else {
+            if ($isDefinedTest) {
+                return false;
+            }
+
+            if ($ignoreStrictCheck || !$this->env->isStrictVariables()) {
+                return null;
+            }
+
+            throw new Twig_Error_Runtime(sprintf('Method "%s" for object "%s" does not exist', $item, get_class($object)), -1, $this->getTemplateName());
+        }
+
+        if ($isDefinedTest) {
+            return true;
+        }
+
+        if ($this->env->hasExtension('sandbox')) {
+            $this->env->getExtension('sandbox')->checkMethodAllowed($object, $method);
+        }
+
+        $ret = call_user_func_array(array($object, $method), $arguments);
+
+        // useful when calling a template method from a template
+        // this is not supported but unfortunately heavily used in the Symfony profiler
+        if ($object instanceof Twig_TemplateInterface) {
+            return $ret === '' ? '' : new Twig_Markup($ret, $this->env->getCharset());
+        }
+
+        return $ret;
+    }
+
+    /**
+     * This method is only useful when testing Twig. Do not use it.
+     */
+    public static function clearCache()
+    {
+        self::$cache = array();
+    }
+}
diff --git a/inc/Twig/TemplateInterface.php b/inc/Twig/TemplateInterface.php
new file mode 100644
index 00000000..879f503e
--- /dev/null
+++ b/inc/Twig/TemplateInterface.php
@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by all compiled templates.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_TemplateInterface
+{
+    const ANY_CALL    = 'any';
+    const ARRAY_CALL  = 'array';
+    const METHOD_CALL = 'method';
+
+    /**
+     * Renders the template with the given context and returns it as string.
+     *
+     * @param array $context An array of parameters to pass to the template
+     *
+     * @return string The rendered template
+     */
+    public function render(array $context);
+
+    /**
+     * Displays the template with the given context.
+     *
+     * @param array $context An array of parameters to pass to the template
+     * @param array $blocks  An array of blocks to pass to the template
+     */
+    public function display(array $context, array $blocks = array());
+
+    /**
+     * Returns the bound environment for this template.
+     *
+     * @return Twig_Environment The current environment
+     */
+    public function getEnvironment();
+}
diff --git a/inc/Twig/Test.php b/inc/Twig/Test.php
new file mode 100644
index 00000000..3baff885
--- /dev/null
+++ b/inc/Twig/Test.php
@@ -0,0 +1,34 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template test.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+abstract class Twig_Test implements Twig_TestInterface, Twig_TestCallableInterface
+{
+    protected $options;
+    protected $arguments = array();
+
+    public function __construct(array $options = array())
+    {
+        $this->options = array_merge(array(
+            'callable' => null,
+        ), $options);
+    }
+
+    public function getCallable()
+    {
+        return $this->options['callable'];
+    }
+}
diff --git a/inc/Twig/Test/Function.php b/inc/Twig/Test/Function.php
new file mode 100644
index 00000000..4be6b9b9
--- /dev/null
+++ b/inc/Twig/Test/Function.php
@@ -0,0 +1,35 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a function template test.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Test_Function extends Twig_Test
+{
+    protected $function;
+
+    public function __construct($function, array $options = array())
+    {
+        $options['callable'] = $function;
+
+        parent::__construct($options);
+
+        $this->function = $function;
+    }
+
+    public function compile()
+    {
+        return $this->function;
+    }
+}
diff --git a/inc/Twig/Test/IntegrationTestCase.php b/inc/Twig/Test/IntegrationTestCase.php
new file mode 100644
index 00000000..724f0941
--- /dev/null
+++ b/inc/Twig/Test/IntegrationTestCase.php
@@ -0,0 +1,154 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Integration test helper
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Karma Dordrak <drak@zikula.org>
+ */
+abstract class Twig_Test_IntegrationTestCase extends PHPUnit_Framework_TestCase
+{
+    abstract protected function getExtensions();
+    abstract protected function getFixturesDir();
+
+    /**
+     * @dataProvider getTests
+     */
+    public function testIntegration($file, $message, $condition, $templates, $exception, $outputs)
+    {
+        $this->doIntegrationTest($file, $message, $condition, $templates, $exception, $outputs);
+    }
+
+    public function getTests()
+    {
+        $fixturesDir = realpath($this->getFixturesDir());
+        $tests = array();
+
+        foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($fixturesDir), RecursiveIteratorIterator::LEAVES_ONLY) as $file) {
+            if (!preg_match('/\.test$/', $file)) {
+                continue;
+            }
+
+            $test = file_get_contents($file->getRealpath());
+
+            if (preg_match('/
+                    --TEST--\s*(.*?)\s*(?:--CONDITION--\s*(.*))?\s*((?:--TEMPLATE(?:\(.*?\))?--(?:.*?))+)\s*(?:--DATA--\s*(.*))?\s*--EXCEPTION--\s*(.*)/sx', $test, $match)) {
+                $message = $match[1];
+                $condition = $match[2];
+                $templates = $this->parseTemplates($match[3]);
+                $exception = $match[5];
+                $outputs = array(array(null, $match[4], null, ''));
+            } elseif (preg_match('/--TEST--\s*(.*?)\s*(?:--CONDITION--\s*(.*))?\s*((?:--TEMPLATE(?:\(.*?\))?--(?:.*?))+)--DATA--.*?--EXPECT--.*/s', $test, $match)) {
+                $message = $match[1];
+                $condition = $match[2];
+                $templates = $this->parseTemplates($match[3]);
+                $exception = false;
+                preg_match_all('/--DATA--(.*?)(?:--CONFIG--(.*?))?--EXPECT--(.*?)(?=\-\-DATA\-\-|$)/s', $test, $outputs, PREG_SET_ORDER);
+            } else {
+                throw new InvalidArgumentException(sprintf('Test "%s" is not valid.', str_replace($fixturesDir.'/', '', $file)));
+            }
+
+            $tests[] = array(str_replace($fixturesDir.'/', '', $file), $message, $condition, $templates, $exception, $outputs);
+        }
+
+        return $tests;
+    }
+
+    protected function doIntegrationTest($file, $message, $condition, $templates, $exception, $outputs)
+    {
+        if ($condition) {
+            eval('$ret = '.$condition.';');
+            if (!$ret) {
+                $this->markTestSkipped($condition);
+            }
+        }
+
+        $loader = new Twig_Loader_Array($templates);
+
+        foreach ($outputs as $match) {
+            $config = array_merge(array(
+                'cache' => false,
+                'strict_variables' => true,
+            ), $match[2] ? eval($match[2].';') : array());
+            $twig = new Twig_Environment($loader, $config);
+            $twig->addGlobal('global', 'global');
+            foreach ($this->getExtensions() as $extension) {
+                $twig->addExtension($extension);
+            }
+
+            try {
+                $template = $twig->loadTemplate('index.twig');
+            } catch (Exception $e) {
+                if (false !== $exception) {
+                    $this->assertEquals(trim($exception), trim(sprintf('%s: %s', get_class($e), $e->getMessage())));
+
+                    return;
+                }
+
+                if ($e instanceof Twig_Error_Syntax) {
+                    $e->setTemplateFile($file);
+
+                    throw $e;
+                }
+
+                throw new Twig_Error(sprintf('%s: %s', get_class($e), $e->getMessage()), -1, $file, $e);
+            }
+
+            try {
+                $output = trim($template->render(eval($match[1].';')), "\n ");
+            } catch (Exception $e) {
+                if (false !== $exception) {
+                    $this->assertEquals(trim($exception), trim(sprintf('%s: %s', get_class($e), $e->getMessage())));
+
+                    return;
+                }
+
+                if ($e instanceof Twig_Error_Syntax) {
+                    $e->setTemplateFile($file);
+                } else {
+                    $e = new Twig_Error(sprintf('%s: %s', get_class($e), $e->getMessage()), -1, $file, $e);
+                }
+
+                $output = trim(sprintf('%s: %s', get_class($e), $e->getMessage()));
+            }
+
+            if (false !== $exception) {
+                list($class, ) = explode(':', $exception);
+                $this->assertThat(NULL, new PHPUnit_Framework_Constraint_Exception($class));
+            }
+
+            $expected = trim($match[3], "\n ");
+
+            if ($expected != $output) {
+                echo 'Compiled template that failed:';
+
+                foreach (array_keys($templates) as $name) {
+                    echo "Template: $name\n";
+                    $source = $loader->getSource($name);
+                    echo $twig->compile($twig->parse($twig->tokenize($source, $name)));
+                }
+            }
+            $this->assertEquals($expected, $output, $message.' (in '.$file.')');
+        }
+    }
+
+    protected static function parseTemplates($test)
+    {
+        $templates = array();
+        preg_match_all('/--TEMPLATE(?:\((.*?)\))?--(.*?)(?=\-\-TEMPLATE|$)/s', $test, $matches, PREG_SET_ORDER);
+        foreach ($matches as $match) {
+            $templates[($match[1] ? $match[1] : 'index.twig')] = $match[2];
+        }
+
+        return $templates;
+    }
+}
diff --git a/inc/Twig/Test/Method.php b/inc/Twig/Test/Method.php
new file mode 100644
index 00000000..17c6c041
--- /dev/null
+++ b/inc/Twig/Test/Method.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a method template test.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Test_Method extends Twig_Test
+{
+    protected $extension;
+    protected $method;
+
+    public function __construct(Twig_ExtensionInterface $extension, $method, array $options = array())
+    {
+        $options['callable'] = array($extension, $method);
+
+        parent::__construct($options);
+
+        $this->extension = $extension;
+        $this->method = $method;
+    }
+
+    public function compile()
+    {
+        return sprintf('$this->env->getExtension(\'%s\')->%s', $this->extension->getName(), $this->method);
+    }
+}
diff --git a/inc/Twig/Test/Node.php b/inc/Twig/Test/Node.php
new file mode 100644
index 00000000..c832a57b
--- /dev/null
+++ b/inc/Twig/Test/Node.php
@@ -0,0 +1,37 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template test as a Node.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_Test_Node extends Twig_Test
+{
+    protected $class;
+
+    public function __construct($class, array $options = array())
+    {
+        parent::__construct($options);
+
+        $this->class = $class;
+    }
+
+    public function getClass()
+    {
+        return $this->class;
+    }
+
+    public function compile()
+    {
+    }
+}
diff --git a/inc/Twig/Test/NodeTestCase.php b/inc/Twig/Test/NodeTestCase.php
new file mode 100644
index 00000000..b15c85ff
--- /dev/null
+++ b/inc/Twig/Test/NodeTestCase.php
@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+abstract class Twig_Test_NodeTestCase extends PHPUnit_Framework_TestCase
+{
+    abstract public function getTests();
+
+    /**
+     * @dataProvider getTests
+     */
+    public function testCompile($node, $source, $environment = null)
+    {
+        $this->assertNodeCompilation($source, $node, $environment);
+    }
+
+    public function assertNodeCompilation($source, Twig_Node $node, Twig_Environment $environment = null)
+    {
+        $compiler = $this->getCompiler($environment);
+        $compiler->compile($node);
+
+        $this->assertEquals($source, trim($compiler->getSource()));
+    }
+
+    protected function getCompiler(Twig_Environment $environment = null)
+    {
+        return new Twig_Compiler(null === $environment ? $this->getEnvironment() : $environment);
+    }
+
+    protected function getEnvironment()
+    {
+        return new Twig_Environment();
+    }
+
+    protected function getVariableGetter($name)
+    {
+        if (version_compare(phpversion(), '5.4.0RC1', '>=')) {
+            return sprintf('(isset($context["%s"]) ? $context["%s"] : null)', $name, $name);
+        }
+
+        return sprintf('$this->getContext($context, "%s")', $name);
+    }
+
+    protected function getAttributeGetter()
+    {
+        if (function_exists('twig_template_get_attributes')) {
+            return 'twig_template_get_attributes($this, ';
+        }
+
+        return '$this->getAttribute(';
+    }
+}
diff --git a/inc/Twig/TestCallableInterface.php b/inc/Twig/TestCallableInterface.php
new file mode 100644
index 00000000..0db43682
--- /dev/null
+++ b/inc/Twig/TestCallableInterface.php
@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a callable template test.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_TestCallableInterface
+{
+    public function getCallable();
+}
diff --git a/inc/Twig/TestInterface.php b/inc/Twig/TestInterface.php
new file mode 100644
index 00000000..30d8a2c4
--- /dev/null
+++ b/inc/Twig/TestInterface.php
@@ -0,0 +1,26 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a template test.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_TestInterface
+{
+    /**
+     * Compiles a test.
+     *
+     * @return string The PHP code for the test
+     */
+    public function compile();
+}
diff --git a/inc/Twig/Token.php b/inc/Twig/Token.php
new file mode 100644
index 00000000..bbca90db
--- /dev/null
+++ b/inc/Twig/Token.php
@@ -0,0 +1,218 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a Token.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_Token
+{
+    protected $value;
+    protected $type;
+    protected $lineno;
+
+    const EOF_TYPE                  = -1;
+    const TEXT_TYPE                 = 0;
+    const BLOCK_START_TYPE          = 1;
+    const VAR_START_TYPE            = 2;
+    const BLOCK_END_TYPE            = 3;
+    const VAR_END_TYPE              = 4;
+    const NAME_TYPE                 = 5;
+    const NUMBER_TYPE               = 6;
+    const STRING_TYPE               = 7;
+    const OPERATOR_TYPE             = 8;
+    const PUNCTUATION_TYPE          = 9;
+    const INTERPOLATION_START_TYPE  = 10;
+    const INTERPOLATION_END_TYPE    = 11;
+
+    /**
+     * Constructor.
+     *
+     * @param integer $type   The type of the token
+     * @param string  $value  The token value
+     * @param integer $lineno The line position in the source
+     */
+    public function __construct($type, $value, $lineno)
+    {
+        $this->type   = $type;
+        $this->value  = $value;
+        $this->lineno = $lineno;
+    }
+
+    /**
+     * Returns a string representation of the token.
+     *
+     * @return string A string representation of the token
+     */
+    public function __toString()
+    {
+        return sprintf('%s(%s)', self::typeToString($this->type, true, $this->lineno), $this->value);
+    }
+
+    /**
+     * Tests the current token for a type and/or a value.
+     *
+     * Parameters may be:
+     * * just type
+     * * type and value (or array of possible values)
+     * * just value (or array of possible values) (NAME_TYPE is used as type)
+     *
+     * @param array|integer     $type   The type to test
+     * @param array|string|null $values The token value
+     *
+     * @return Boolean
+     */
+    public function test($type, $values = null)
+    {
+        if (null === $values && !is_int($type)) {
+            $values = $type;
+            $type = self::NAME_TYPE;
+        }
+
+        return ($this->type === $type) && (
+            null === $values ||
+            (is_array($values) && in_array($this->value, $values)) ||
+            $this->value == $values
+        );
+    }
+
+    /**
+     * Gets the line.
+     *
+     * @return integer The source line
+     */
+    public function getLine()
+    {
+        return $this->lineno;
+    }
+
+    /**
+     * Gets the token type.
+     *
+     * @return integer The token type
+     */
+    public function getType()
+    {
+        return $this->type;
+    }
+
+    /**
+     * Gets the token value.
+     *
+     * @return string The token value
+     */
+    public function getValue()
+    {
+        return $this->value;
+    }
+
+    /**
+     * Returns the constant representation (internal) of a given type.
+     *
+     * @param integer $type  The type as an integer
+     * @param Boolean $short Whether to return a short representation or not
+     * @param integer $line  The code line
+     *
+     * @return string The string representation
+     */
+    public static function typeToString($type, $short = false, $line = -1)
+    {
+        switch ($type) {
+            case self::EOF_TYPE:
+                $name = 'EOF_TYPE';
+                break;
+            case self::TEXT_TYPE:
+                $name = 'TEXT_TYPE';
+                break;
+            case self::BLOCK_START_TYPE:
+                $name = 'BLOCK_START_TYPE';
+                break;
+            case self::VAR_START_TYPE:
+                $name = 'VAR_START_TYPE';
+                break;
+            case self::BLOCK_END_TYPE:
+                $name = 'BLOCK_END_TYPE';
+                break;
+            case self::VAR_END_TYPE:
+                $name = 'VAR_END_TYPE';
+                break;
+            case self::NAME_TYPE:
+                $name = 'NAME_TYPE';
+                break;
+            case self::NUMBER_TYPE:
+                $name = 'NUMBER_TYPE';
+                break;
+            case self::STRING_TYPE:
+                $name = 'STRING_TYPE';
+                break;
+            case self::OPERATOR_TYPE:
+                $name = 'OPERATOR_TYPE';
+                break;
+            case self::PUNCTUATION_TYPE:
+                $name = 'PUNCTUATION_TYPE';
+                break;
+            case self::INTERPOLATION_START_TYPE:
+                $name = 'INTERPOLATION_START_TYPE';
+                break;
+            case self::INTERPOLATION_END_TYPE:
+                $name = 'INTERPOLATION_END_TYPE';
+                break;
+            default:
+                throw new LogicException(sprintf('Token of type "%s" does not exist.', $type));
+        }
+
+        return $short ? $name : 'Twig_Token::'.$name;
+    }
+
+    /**
+     * Returns the english representation of a given type.
+     *
+     * @param integer $type The type as an integer
+     * @param integer $line The code line
+     *
+     * @return string The string representation
+     */
+    public static function typeToEnglish($type, $line = -1)
+    {
+        switch ($type) {
+            case self::EOF_TYPE:
+                return 'end of template';
+            case self::TEXT_TYPE:
+                return 'text';
+            case self::BLOCK_START_TYPE:
+                return 'begin of statement block';
+            case self::VAR_START_TYPE:
+                return 'begin of print statement';
+            case self::BLOCK_END_TYPE:
+                return 'end of statement block';
+            case self::VAR_END_TYPE:
+                return 'end of print statement';
+            case self::NAME_TYPE:
+                return 'name';
+            case self::NUMBER_TYPE:
+                return 'number';
+            case self::STRING_TYPE:
+                return 'string';
+            case self::OPERATOR_TYPE:
+                return 'operator';
+            case self::PUNCTUATION_TYPE:
+                return 'punctuation';
+            case self::INTERPOLATION_START_TYPE:
+                return 'begin of string interpolation';
+            case self::INTERPOLATION_END_TYPE:
+                return 'end of string interpolation';
+            default:
+                throw new LogicException(sprintf('Token of type "%s" does not exist.', $type));
+        }
+    }
+}
diff --git a/inc/Twig/TokenParser.php b/inc/Twig/TokenParser.php
new file mode 100644
index 00000000..decebd5e
--- /dev/null
+++ b/inc/Twig/TokenParser.php
@@ -0,0 +1,33 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Base class for all token parsers.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Twig_TokenParser implements Twig_TokenParserInterface
+{
+    /**
+     * @var Twig_Parser
+     */
+    protected $parser;
+
+    /**
+     * Sets the parser associated with this token parser
+     *
+     * @param $parser A Twig_Parser instance
+     */
+    public function setParser(Twig_Parser $parser)
+    {
+        $this->parser = $parser;
+    }
+}
diff --git a/inc/Twig/TokenParser/AutoEscape.php b/inc/Twig/TokenParser/AutoEscape.php
new file mode 100644
index 00000000..27560288
--- /dev/null
+++ b/inc/Twig/TokenParser/AutoEscape.php
@@ -0,0 +1,89 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Marks a section of a template to be escaped or not.
+ *
+ * <pre>
+ * {% autoescape true %}
+ *   Everything will be automatically escaped in this block
+ * {% endautoescape %}
+ *
+ * {% autoescape false %}
+ *   Everything will be outputed as is in this block
+ * {% endautoescape %}
+ *
+ * {% autoescape true js %}
+ *   Everything will be automatically escaped in this block
+ *   using the js escaping strategy
+ * {% endautoescape %}
+ * </pre>
+ */
+class Twig_TokenParser_AutoEscape extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+
+        if ($stream->test(Twig_Token::BLOCK_END_TYPE)) {
+            $value = 'html';
+        } else {
+            $expr = $this->parser->getExpressionParser()->parseExpression();
+            if (!$expr instanceof Twig_Node_Expression_Constant) {
+                throw new Twig_Error_Syntax('An escaping strategy must be a string or a Boolean.', $stream->getCurrent()->getLine(), $stream->getFilename());
+            }
+            $value = $expr->getAttribute('value');
+
+            $compat = true === $value || false === $value;
+
+            if (true === $value) {
+                $value = 'html';
+            }
+
+            if ($compat && $stream->test(Twig_Token::NAME_TYPE)) {
+                if (false === $value) {
+                    throw new Twig_Error_Syntax('Unexpected escaping strategy as you set autoescaping to false.', $stream->getCurrent()->getLine(), $stream->getFilename());
+                }
+
+                $value = $stream->next()->getValue();
+            }
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+        $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Node_AutoEscape($value, $body, $lineno, $this->getTag());
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endautoescape');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'autoescape';
+    }
+}
diff --git a/inc/Twig/TokenParser/Block.php b/inc/Twig/TokenParser/Block.php
new file mode 100644
index 00000000..a2e017f3
--- /dev/null
+++ b/inc/Twig/TokenParser/Block.php
@@ -0,0 +1,83 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Marks a section of a template as being reusable.
+ *
+ * <pre>
+ *  {% block head %}
+ *    <link rel="stylesheet" href="style.css" />
+ *    <title>{% block title %}{% endblock %} - My Webpage</title>
+ *  {% endblock %}
+ * </pre>
+ */
+class Twig_TokenParser_Block extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+        $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+        if ($this->parser->hasBlock($name)) {
+            throw new Twig_Error_Syntax(sprintf("The block '$name' has already been defined line %d", $this->parser->getBlock($name)->getLine()), $stream->getCurrent()->getLine(), $stream->getFilename());
+        }
+        $this->parser->setBlock($name, $block = new Twig_Node_Block($name, new Twig_Node(array()), $lineno));
+        $this->parser->pushLocalScope();
+        $this->parser->pushBlockStack($name);
+
+        if ($stream->test(Twig_Token::BLOCK_END_TYPE)) {
+            $stream->next();
+
+            $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+            if ($stream->test(Twig_Token::NAME_TYPE)) {
+                $value = $stream->next()->getValue();
+
+                if ($value != $name) {
+                    throw new Twig_Error_Syntax(sprintf("Expected endblock for block '$name' (but %s given)", $value), $stream->getCurrent()->getLine(), $stream->getFilename());
+                }
+            }
+        } else {
+            $body = new Twig_Node(array(
+                new Twig_Node_Print($this->parser->getExpressionParser()->parseExpression(), $lineno),
+            ));
+        }
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $block->setNode('body', $body);
+        $this->parser->popBlockStack();
+        $this->parser->popLocalScope();
+
+        return new Twig_Node_BlockReference($name, $lineno, $this->getTag());
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endblock');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'block';
+    }
+}
diff --git a/inc/Twig/TokenParser/Do.php b/inc/Twig/TokenParser/Do.php
new file mode 100644
index 00000000..f50939dd
--- /dev/null
+++ b/inc/Twig/TokenParser/Do.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Evaluates an expression, discarding the returned value.
+ */
+class Twig_TokenParser_Do extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $expr = $this->parser->getExpressionParser()->parseExpression();
+
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Node_Do($expr, $token->getLine(), $this->getTag());
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'do';
+    }
+}
diff --git a/inc/Twig/TokenParser/Embed.php b/inc/Twig/TokenParser/Embed.php
new file mode 100644
index 00000000..69cb5f35
--- /dev/null
+++ b/inc/Twig/TokenParser/Embed.php
@@ -0,0 +1,66 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2012 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Embeds a template.
+ */
+class Twig_TokenParser_Embed extends Twig_TokenParser_Include
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $stream = $this->parser->getStream();
+
+        $parent = $this->parser->getExpressionParser()->parseExpression();
+
+        list($variables, $only, $ignoreMissing) = $this->parseArguments();
+
+        // inject a fake parent to make the parent() function work
+        $stream->injectTokens(array(
+            new Twig_Token(Twig_Token::BLOCK_START_TYPE, '', $token->getLine()),
+            new Twig_Token(Twig_Token::NAME_TYPE, 'extends', $token->getLine()),
+            new Twig_Token(Twig_Token::STRING_TYPE, '__parent__', $token->getLine()),
+            new Twig_Token(Twig_Token::BLOCK_END_TYPE, '', $token->getLine()),
+        ));
+
+        $module = $this->parser->parse($stream, array($this, 'decideBlockEnd'), true);
+
+        // override the parent with the correct one
+        $module->setNode('parent', $parent);
+
+        $this->parser->embedTemplate($module);
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Node_Embed($module->getAttribute('filename'), $module->getAttribute('index'), $variables, $only, $ignoreMissing, $token->getLine(), $this->getTag());
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endembed');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'embed';
+    }
+}
diff --git a/inc/Twig/TokenParser/Extends.php b/inc/Twig/TokenParser/Extends.php
new file mode 100644
index 00000000..f5ecee21
--- /dev/null
+++ b/inc/Twig/TokenParser/Extends.php
@@ -0,0 +1,52 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Extends a template by another one.
+ *
+ * <pre>
+ *  {% extends "base.html" %}
+ * </pre>
+ */
+class Twig_TokenParser_Extends extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        if (!$this->parser->isMainScope()) {
+            throw new Twig_Error_Syntax('Cannot extend from a block', $token->getLine(), $this->parser->getFilename());
+        }
+
+        if (null !== $this->parser->getParent()) {
+            throw new Twig_Error_Syntax('Multiple extends tags are forbidden', $token->getLine(), $this->parser->getFilename());
+        }
+        $this->parser->setParent($this->parser->getExpressionParser()->parseExpression());
+
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'extends';
+    }
+}
diff --git a/inc/Twig/TokenParser/Filter.php b/inc/Twig/TokenParser/Filter.php
new file mode 100644
index 00000000..2b97475a
--- /dev/null
+++ b/inc/Twig/TokenParser/Filter.php
@@ -0,0 +1,61 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Filters a section of a template by applying filters.
+ *
+ * <pre>
+ * {% filter upper %}
+ *  This text becomes uppercase
+ * {% endfilter %}
+ * </pre>
+ */
+class Twig_TokenParser_Filter extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $name = $this->parser->getVarName();
+        $ref = new Twig_Node_Expression_BlockReference(new Twig_Node_Expression_Constant($name, $token->getLine()), true, $token->getLine(), $this->getTag());
+
+        $filter = $this->parser->getExpressionParser()->parseFilterExpressionRaw($ref, $this->getTag());
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $block = new Twig_Node_Block($name, $body, $token->getLine());
+        $this->parser->setBlock($name, $block);
+
+        return new Twig_Node_Print($filter, $token->getLine(), $this->getTag());
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endfilter');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'filter';
+    }
+}
diff --git a/inc/Twig/TokenParser/Flush.php b/inc/Twig/TokenParser/Flush.php
new file mode 100644
index 00000000..4e15e785
--- /dev/null
+++ b/inc/Twig/TokenParser/Flush.php
@@ -0,0 +1,42 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Flushes the output to the client.
+ *
+ * @see flush()
+ */
+class Twig_TokenParser_Flush extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Node_Flush($token->getLine(), $this->getTag());
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'flush';
+    }
+}
diff --git a/inc/Twig/TokenParser/For.php b/inc/Twig/TokenParser/For.php
new file mode 100644
index 00000000..98a6d079
--- /dev/null
+++ b/inc/Twig/TokenParser/For.php
@@ -0,0 +1,136 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Loops over each item of a sequence.
+ *
+ * <pre>
+ * <ul>
+ *  {% for user in users %}
+ *    <li>{{ user.username|e }}</li>
+ *  {% endfor %}
+ * </ul>
+ * </pre>
+ */
+class Twig_TokenParser_For extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+        $targets = $this->parser->getExpressionParser()->parseAssignmentExpression();
+        $stream->expect(Twig_Token::OPERATOR_TYPE, 'in');
+        $seq = $this->parser->getExpressionParser()->parseExpression();
+
+        $ifexpr = null;
+        if ($stream->test(Twig_Token::NAME_TYPE, 'if')) {
+            $stream->next();
+            $ifexpr = $this->parser->getExpressionParser()->parseExpression();
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+        $body = $this->parser->subparse(array($this, 'decideForFork'));
+        if ($stream->next()->getValue() == 'else') {
+            $stream->expect(Twig_Token::BLOCK_END_TYPE);
+            $else = $this->parser->subparse(array($this, 'decideForEnd'), true);
+        } else {
+            $else = null;
+        }
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        if (count($targets) > 1) {
+            $keyTarget = $targets->getNode(0);
+            $keyTarget = new Twig_Node_Expression_AssignName($keyTarget->getAttribute('name'), $keyTarget->getLine());
+            $valueTarget = $targets->getNode(1);
+            $valueTarget = new Twig_Node_Expression_AssignName($valueTarget->getAttribute('name'), $valueTarget->getLine());
+        } else {
+            $keyTarget = new Twig_Node_Expression_AssignName('_key', $lineno);
+            $valueTarget = $targets->getNode(0);
+            $valueTarget = new Twig_Node_Expression_AssignName($valueTarget->getAttribute('name'), $valueTarget->getLine());
+        }
+
+        if ($ifexpr) {
+            $this->checkLoopUsageCondition($stream, $ifexpr);
+            $this->checkLoopUsageBody($stream, $body);
+        }
+
+        return new Twig_Node_For($keyTarget, $valueTarget, $seq, $ifexpr, $body, $else, $lineno, $this->getTag());
+    }
+
+    public function decideForFork(Twig_Token $token)
+    {
+        return $token->test(array('else', 'endfor'));
+    }
+
+    public function decideForEnd(Twig_Token $token)
+    {
+        return $token->test('endfor');
+    }
+
+    // the loop variable cannot be used in the condition
+    protected function checkLoopUsageCondition(Twig_TokenStream $stream, Twig_NodeInterface $node)
+    {
+        if ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node->getNode('node')->getAttribute('name')) {
+            throw new Twig_Error_Syntax('The "loop" variable cannot be used in a looping condition', $node->getLine(), $stream->getFilename());
+        }
+
+        foreach ($node as $n) {
+            if (!$n) {
+                continue;
+            }
+
+            $this->checkLoopUsageCondition($stream, $n);
+        }
+    }
+
+    // check usage of non-defined loop-items
+    // it does not catch all problems (for instance when a for is included into another or when the variable is used in an include)
+    protected function checkLoopUsageBody(Twig_TokenStream $stream, Twig_NodeInterface $node)
+    {
+        if ($node instanceof Twig_Node_Expression_GetAttr && $node->getNode('node') instanceof Twig_Node_Expression_Name && 'loop' == $node->getNode('node')->getAttribute('name')) {
+            $attribute = $node->getNode('attribute');
+            if ($attribute instanceof Twig_Node_Expression_Constant && in_array($attribute->getAttribute('value'), array('length', 'revindex0', 'revindex', 'last'))) {
+                throw new Twig_Error_Syntax(sprintf('The "loop.%s" variable is not defined when looping with a condition', $attribute->getAttribute('value')), $node->getLine(), $stream->getFilename());
+            }
+        }
+
+        // should check for parent.loop.XXX usage
+        if ($node instanceof Twig_Node_For) {
+            return;
+        }
+
+        foreach ($node as $n) {
+            if (!$n) {
+                continue;
+            }
+
+            $this->checkLoopUsageBody($stream, $n);
+        }
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'for';
+    }
+}
diff --git a/inc/Twig/TokenParser/From.php b/inc/Twig/TokenParser/From.php
new file mode 100644
index 00000000..a54054db
--- /dev/null
+++ b/inc/Twig/TokenParser/From.php
@@ -0,0 +1,74 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Imports macros.
+ *
+ * <pre>
+ *   {% from 'forms.html' import forms %}
+ * </pre>
+ */
+class Twig_TokenParser_From extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $macro = $this->parser->getExpressionParser()->parseExpression();
+        $stream = $this->parser->getStream();
+        $stream->expect('import');
+
+        $targets = array();
+        do {
+            $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+
+            $alias = $name;
+            if ($stream->test('as')) {
+                $stream->next();
+
+                $alias = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+            }
+
+            $targets[$name] = $alias;
+
+            if (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                break;
+            }
+
+            $stream->next();
+        } while (true);
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $node = new Twig_Node_Import($macro, new Twig_Node_Expression_AssignName($this->parser->getVarName(), $token->getLine()), $token->getLine(), $this->getTag());
+
+        foreach ($targets as $name => $alias) {
+            $this->parser->addImportedSymbol('function', $alias, 'get'.$name, $node->getNode('var'));
+        }
+
+        return $node;
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'from';
+    }
+}
diff --git a/inc/Twig/TokenParser/If.php b/inc/Twig/TokenParser/If.php
new file mode 100644
index 00000000..3d7d1f51
--- /dev/null
+++ b/inc/Twig/TokenParser/If.php
@@ -0,0 +1,94 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Tests a condition.
+ *
+ * <pre>
+ * {% if users %}
+ *  <ul>
+ *    {% for user in users %}
+ *      <li>{{ user.username|e }}</li>
+ *    {% endfor %}
+ *  </ul>
+ * {% endif %}
+ * </pre>
+ */
+class Twig_TokenParser_If extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $expr = $this->parser->getExpressionParser()->parseExpression();
+        $stream = $this->parser->getStream();
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+        $body = $this->parser->subparse(array($this, 'decideIfFork'));
+        $tests = array($expr, $body);
+        $else = null;
+
+        $end = false;
+        while (!$end) {
+            switch ($stream->next()->getValue()) {
+                case 'else':
+                    $stream->expect(Twig_Token::BLOCK_END_TYPE);
+                    $else = $this->parser->subparse(array($this, 'decideIfEnd'));
+                    break;
+
+                case 'elseif':
+                    $expr = $this->parser->getExpressionParser()->parseExpression();
+                    $stream->expect(Twig_Token::BLOCK_END_TYPE);
+                    $body = $this->parser->subparse(array($this, 'decideIfFork'));
+                    $tests[] = $expr;
+                    $tests[] = $body;
+                    break;
+
+                case 'endif':
+                    $end = true;
+                    break;
+
+                default:
+                    throw new Twig_Error_Syntax(sprintf('Unexpected end of template. Twig was looking for the following tags "else", "elseif", or "endif" to close the "if" block started at line %d)', $lineno), $stream->getCurrent()->getLine(), $stream->getFilename());
+            }
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Node_If(new Twig_Node($tests), $else, $lineno, $this->getTag());
+    }
+
+    public function decideIfFork(Twig_Token $token)
+    {
+        return $token->test(array('elseif', 'else', 'endif'));
+    }
+
+    public function decideIfEnd(Twig_Token $token)
+    {
+        return $token->test(array('endif'));
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'if';
+    }
+}
diff --git a/inc/Twig/TokenParser/Import.php b/inc/Twig/TokenParser/Import.php
new file mode 100644
index 00000000..e7050c70
--- /dev/null
+++ b/inc/Twig/TokenParser/Import.php
@@ -0,0 +1,49 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Imports macros.
+ *
+ * <pre>
+ *   {% import 'forms.html' as forms %}
+ * </pre>
+ */
+class Twig_TokenParser_Import extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $macro = $this->parser->getExpressionParser()->parseExpression();
+        $this->parser->getStream()->expect('as');
+        $var = new Twig_Node_Expression_AssignName($this->parser->getStream()->expect(Twig_Token::NAME_TYPE)->getValue(), $token->getLine());
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $this->parser->addImportedSymbol('template', $var->getAttribute('name'));
+
+        return new Twig_Node_Import($macro, $var, $token->getLine(), $this->getTag());
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'import';
+    }
+}
diff --git a/inc/Twig/TokenParser/Include.php b/inc/Twig/TokenParser/Include.php
new file mode 100644
index 00000000..4a317868
--- /dev/null
+++ b/inc/Twig/TokenParser/Include.php
@@ -0,0 +1,80 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Includes a template.
+ *
+ * <pre>
+ *   {% include 'header.html' %}
+ *     Body
+ *   {% include 'footer.html' %}
+ * </pre>
+ */
+class Twig_TokenParser_Include extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $expr = $this->parser->getExpressionParser()->parseExpression();
+
+        list($variables, $only, $ignoreMissing) = $this->parseArguments();
+
+        return new Twig_Node_Include($expr, $variables, $only, $ignoreMissing, $token->getLine(), $this->getTag());
+    }
+
+    protected function parseArguments()
+    {
+        $stream = $this->parser->getStream();
+
+        $ignoreMissing = false;
+        if ($stream->test(Twig_Token::NAME_TYPE, 'ignore')) {
+            $stream->next();
+            $stream->expect(Twig_Token::NAME_TYPE, 'missing');
+
+            $ignoreMissing = true;
+        }
+
+        $variables = null;
+        if ($stream->test(Twig_Token::NAME_TYPE, 'with')) {
+            $stream->next();
+
+            $variables = $this->parser->getExpressionParser()->parseExpression();
+        }
+
+        $only = false;
+        if ($stream->test(Twig_Token::NAME_TYPE, 'only')) {
+            $stream->next();
+
+            $only = true;
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return array($variables, $only, $ignoreMissing);
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'include';
+    }
+}
diff --git a/inc/Twig/TokenParser/Macro.php b/inc/Twig/TokenParser/Macro.php
new file mode 100644
index 00000000..82b4fa6d
--- /dev/null
+++ b/inc/Twig/TokenParser/Macro.php
@@ -0,0 +1,68 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Defines a macro.
+ *
+ * <pre>
+ * {% macro input(name, value, type, size) %}
+ *    <input type="{{ type|default('text') }}" name="{{ name }}" value="{{ value|e }}" size="{{ size|default(20) }}" />
+ * {% endmacro %}
+ * </pre>
+ */
+class Twig_TokenParser_Macro extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+        $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+
+        $arguments = $this->parser->getExpressionParser()->parseArguments(true, true);
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+        $this->parser->pushLocalScope();
+        $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+        if ($stream->test(Twig_Token::NAME_TYPE)) {
+            $value = $stream->next()->getValue();
+
+            if ($value != $name) {
+                throw new Twig_Error_Syntax(sprintf("Expected endmacro for macro '$name' (but %s given)", $value), $stream->getCurrent()->getLine(), $stream->getFilename());
+            }
+        }
+        $this->parser->popLocalScope();
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $this->parser->setMacro($name, new Twig_Node_Macro($name, new Twig_Node_Body(array($body)), $arguments, $lineno, $this->getTag()));
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endmacro');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'macro';
+    }
+}
diff --git a/inc/Twig/TokenParser/Sandbox.php b/inc/Twig/TokenParser/Sandbox.php
new file mode 100644
index 00000000..9457325a
--- /dev/null
+++ b/inc/Twig/TokenParser/Sandbox.php
@@ -0,0 +1,68 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Marks a section of a template as untrusted code that must be evaluated in the sandbox mode.
+ *
+ * <pre>
+ * {% sandbox %}
+ *     {% include 'user.html' %}
+ * {% endsandbox %}
+ * </pre>
+ *
+ * @see http://www.twig-project.org/doc/api.html#sandbox-extension for details
+ */
+class Twig_TokenParser_Sandbox extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+        $body = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        // in a sandbox tag, only include tags are allowed
+        if (!$body instanceof Twig_Node_Include) {
+            foreach ($body as $node) {
+                if ($node instanceof Twig_Node_Text && ctype_space($node->getAttribute('data'))) {
+                    continue;
+                }
+
+                if (!$node instanceof Twig_Node_Include) {
+                    throw new Twig_Error_Syntax('Only "include" tags are allowed within a "sandbox" section', $node->getLine(), $this->parser->getFilename());
+                }
+            }
+        }
+
+        return new Twig_Node_Sandbox($body, $token->getLine(), $this->getTag());
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endsandbox');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'sandbox';
+    }
+}
diff --git a/inc/Twig/TokenParser/Set.php b/inc/Twig/TokenParser/Set.php
new file mode 100644
index 00000000..70e0b41b
--- /dev/null
+++ b/inc/Twig/TokenParser/Set.php
@@ -0,0 +1,84 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Defines a variable.
+ *
+ * <pre>
+ *  {% set foo = 'foo' %}
+ *
+ *  {% set foo = [1, 2] %}
+ *
+ *  {% set foo = {'foo': 'bar'} %}
+ *
+ *  {% set foo = 'foo' ~ 'bar' %}
+ *
+ *  {% set foo, bar = 'foo', 'bar' %}
+ *
+ *  {% set foo %}Some content{% endset %}
+ * </pre>
+ */
+class Twig_TokenParser_Set extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+        $stream = $this->parser->getStream();
+        $names = $this->parser->getExpressionParser()->parseAssignmentExpression();
+
+        $capture = false;
+        if ($stream->test(Twig_Token::OPERATOR_TYPE, '=')) {
+            $stream->next();
+            $values = $this->parser->getExpressionParser()->parseMultitargetExpression();
+
+            $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+            if (count($names) !== count($values)) {
+                throw new Twig_Error_Syntax("When using set, you must have the same number of variables and assignments.", $stream->getCurrent()->getLine(), $stream->getFilename());
+            }
+        } else {
+            $capture = true;
+
+            if (count($names) > 1) {
+                throw new Twig_Error_Syntax("When using set with a block, you cannot have a multi-target.", $stream->getCurrent()->getLine(), $stream->getFilename());
+            }
+
+            $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+            $values = $this->parser->subparse(array($this, 'decideBlockEnd'), true);
+            $stream->expect(Twig_Token::BLOCK_END_TYPE);
+        }
+
+        return new Twig_Node_Set($capture, $names, $values, $lineno, $this->getTag());
+    }
+
+    public function decideBlockEnd(Twig_Token $token)
+    {
+        return $token->test('endset');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'set';
+    }
+}
diff --git a/inc/Twig/TokenParser/Spaceless.php b/inc/Twig/TokenParser/Spaceless.php
new file mode 100644
index 00000000..1e3fa8f3
--- /dev/null
+++ b/inc/Twig/TokenParser/Spaceless.php
@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Remove whitespaces between HTML tags.
+ *
+ * <pre>
+ * {% spaceless %}
+ *      <div>
+ *          <strong>foo</strong>
+ *      </div>
+ * {% endspaceless %}
+ *
+ * {# output will be <div><strong>foo</strong></div> #}
+ * </pre>
+ */
+class Twig_TokenParser_Spaceless extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $lineno = $token->getLine();
+
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+        $body = $this->parser->subparse(array($this, 'decideSpacelessEnd'), true);
+        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);
+
+        return new Twig_Node_Spaceless($body, $lineno, $this->getTag());
+    }
+
+    public function decideSpacelessEnd(Twig_Token $token)
+    {
+        return $token->test('endspaceless');
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'spaceless';
+    }
+}
diff --git a/inc/Twig/TokenParser/Use.php b/inc/Twig/TokenParser/Use.php
new file mode 100644
index 00000000..bc0e09ef
--- /dev/null
+++ b/inc/Twig/TokenParser/Use.php
@@ -0,0 +1,82 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2011 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Imports blocks defined in another template into the current template.
+ *
+ * <pre>
+ * {% extends "base.html" %}
+ *
+ * {% use "blocks.html" %}
+ *
+ * {% block title %}{% endblock %}
+ * {% block content %}{% endblock %}
+ * </pre>
+ *
+ * @see http://www.twig-project.org/doc/templates.html#horizontal-reuse for details.
+ */
+class Twig_TokenParser_Use extends Twig_TokenParser
+{
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token)
+    {
+        $template = $this->parser->getExpressionParser()->parseExpression();
+        $stream = $this->parser->getStream();
+
+        if (!$template instanceof Twig_Node_Expression_Constant) {
+            throw new Twig_Error_Syntax('The template references in a "use" statement must be a string.', $stream->getCurrent()->getLine(), $stream->getFilename());
+        }
+
+        $targets = array();
+        if ($stream->test('with')) {
+            $stream->next();
+
+            do {
+                $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+
+                $alias = $name;
+                if ($stream->test('as')) {
+                    $stream->next();
+
+                    $alias = $stream->expect(Twig_Token::NAME_TYPE)->getValue();
+                }
+
+                $targets[$name] = new Twig_Node_Expression_Constant($alias, -1);
+
+                if (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ',')) {
+                    break;
+                }
+
+                $stream->next();
+            } while (true);
+        }
+
+        $stream->expect(Twig_Token::BLOCK_END_TYPE);
+
+        $this->parser->addTrait(new Twig_Node(array('template' => $template, 'targets' => new Twig_Node($targets))));
+    }
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag()
+    {
+        return 'use';
+    }
+}
diff --git a/inc/Twig/TokenParserBroker.php b/inc/Twig/TokenParserBroker.php
new file mode 100644
index 00000000..ec3fba67
--- /dev/null
+++ b/inc/Twig/TokenParserBroker.php
@@ -0,0 +1,136 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ * (c) 2010 Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Default implementation of a token parser broker.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+class Twig_TokenParserBroker implements Twig_TokenParserBrokerInterface
+{
+    protected $parser;
+    protected $parsers = array();
+    protected $brokers = array();
+
+    /**
+     * Constructor.
+     *
+     * @param array|Traversable $parsers A Traversable of Twig_TokenParserInterface instances
+     * @param array|Traversable $brokers A Traversable of Twig_TokenParserBrokerInterface instances
+     */
+    public function __construct($parsers = array(), $brokers = array())
+    {
+        foreach ($parsers as $parser) {
+            if (!$parser instanceof Twig_TokenParserInterface) {
+                throw new LogicException('$parsers must a an array of Twig_TokenParserInterface');
+            }
+            $this->parsers[$parser->getTag()] = $parser;
+        }
+        foreach ($brokers as $broker) {
+            if (!$broker instanceof Twig_TokenParserBrokerInterface) {
+                throw new LogicException('$brokers must a an array of Twig_TokenParserBrokerInterface');
+            }
+            $this->brokers[] = $broker;
+        }
+    }
+
+    /**
+     * Adds a TokenParser.
+     *
+     * @param Twig_TokenParserInterface $parser A Twig_TokenParserInterface instance
+     */
+    public function addTokenParser(Twig_TokenParserInterface $parser)
+    {
+        $this->parsers[$parser->getTag()] = $parser;
+    }
+
+    /**
+     * Removes a TokenParser.
+     *
+     * @param Twig_TokenParserInterface $parser A Twig_TokenParserInterface instance
+     */
+    public function removeTokenParser(Twig_TokenParserInterface $parser)
+    {
+        $name = $parser->getTag();
+        if (isset($this->parsers[$name]) && $parser === $this->parsers[$name]) {
+            unset($this->parsers[$name]);
+        }
+    }
+
+    /**
+     * Adds a TokenParserBroker.
+     *
+     * @param Twig_TokenParserBroker $broker A Twig_TokenParserBroker instance
+     */
+    public function addTokenParserBroker(Twig_TokenParserBroker $broker)
+    {
+        $this->brokers[] = $broker;
+    }
+
+    /**
+     * Removes a TokenParserBroker.
+     *
+     * @param Twig_TokenParserBroker $broker A Twig_TokenParserBroker instance
+     */
+    public function removeTokenParserBroker(Twig_TokenParserBroker $broker)
+    {
+        if (false !== $pos = array_search($broker, $this->brokers)) {
+            unset($this->brokers[$pos]);
+        }
+    }
+
+    /**
+     * Gets a suitable TokenParser for a tag.
+     *
+     * First looks in parsers, then in brokers.
+     *
+     * @param string $tag A tag name
+     *
+     * @return null|Twig_TokenParserInterface A Twig_TokenParserInterface or null if no suitable TokenParser was found
+     */
+    public function getTokenParser($tag)
+    {
+        if (isset($this->parsers[$tag])) {
+            return $this->parsers[$tag];
+        }
+        $broker = end($this->brokers);
+        while (false !== $broker) {
+            $parser = $broker->getTokenParser($tag);
+            if (null !== $parser) {
+                return $parser;
+            }
+            $broker = prev($this->brokers);
+        }
+    }
+
+    public function getParsers()
+    {
+        return $this->parsers;
+    }
+
+    public function getParser()
+    {
+        return $this->parser;
+    }
+
+    public function setParser(Twig_ParserInterface $parser)
+    {
+        $this->parser = $parser;
+        foreach ($this->parsers as $tokenParser) {
+            $tokenParser->setParser($parser);
+        }
+        foreach ($this->brokers as $broker) {
+            $broker->setParser($parser);
+        }
+    }
+}
diff --git a/inc/Twig/TokenParserBrokerInterface.php b/inc/Twig/TokenParserBrokerInterface.php
new file mode 100644
index 00000000..3f006e33
--- /dev/null
+++ b/inc/Twig/TokenParserBrokerInterface.php
@@ -0,0 +1,45 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ * (c) 2010 Arnaud Le Blanc
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by token parser brokers.
+ *
+ * Token parser brokers allows to implement custom logic in the process of resolving a token parser for a given tag name.
+ *
+ * @author Arnaud Le Blanc <arnaud.lb@gmail.com>
+ * @deprecated since 1.12 (to be removed in 2.0)
+ */
+interface Twig_TokenParserBrokerInterface
+{
+    /**
+     * Gets a TokenParser suitable for a tag.
+     *
+     * @param string $tag A tag name
+     *
+     * @return null|Twig_TokenParserInterface A Twig_TokenParserInterface or null if no suitable TokenParser was found
+     */
+    public function getTokenParser($tag);
+
+    /**
+     * Calls Twig_TokenParserInterface::setParser on all parsers the implementation knows of.
+     *
+     * @param Twig_ParserInterface $parser A Twig_ParserInterface interface
+     */
+    public function setParser(Twig_ParserInterface $parser);
+
+    /**
+     * Gets the Twig_ParserInterface.
+     *
+     * @return null|Twig_ParserInterface A Twig_ParserInterface instance or null
+     */
+    public function getParser();
+}
diff --git a/inc/Twig/TokenParserInterface.php b/inc/Twig/TokenParserInterface.php
new file mode 100644
index 00000000..bbde7714
--- /dev/null
+++ b/inc/Twig/TokenParserInterface.php
@@ -0,0 +1,41 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2010 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Interface implemented by token parsers.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+interface Twig_TokenParserInterface
+{
+    /**
+     * Sets the parser associated with this token parser
+     *
+     * @param $parser A Twig_Parser instance
+     */
+    public function setParser(Twig_Parser $parser);
+
+    /**
+     * Parses a token and returns a node.
+     *
+     * @param Twig_Token $token A Twig_Token instance
+     *
+     * @return Twig_NodeInterface A Twig_NodeInterface instance
+     */
+    public function parse(Twig_Token $token);
+
+    /**
+     * Gets the tag name associated with this token parser.
+     *
+     * @return string The tag name
+     */
+    public function getTag();
+}
diff --git a/inc/Twig/TokenStream.php b/inc/Twig/TokenStream.php
new file mode 100644
index 00000000..a78189f6
--- /dev/null
+++ b/inc/Twig/TokenStream.php
@@ -0,0 +1,144 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ * (c) 2009 Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a token stream.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_TokenStream
+{
+    protected $tokens;
+    protected $current;
+    protected $filename;
+
+    /**
+     * Constructor.
+     *
+     * @param array  $tokens   An array of tokens
+     * @param string $filename The name of the filename which tokens are associated with
+     */
+    public function __construct(array $tokens, $filename = null)
+    {
+        $this->tokens     = $tokens;
+        $this->current    = 0;
+        $this->filename   = $filename;
+    }
+
+    /**
+     * Returns a string representation of the token stream.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return implode("\n", $this->tokens);
+    }
+
+    public function injectTokens(array $tokens)
+    {
+        $this->tokens = array_merge(array_slice($this->tokens, 0, $this->current), $tokens, array_slice($this->tokens, $this->current));
+    }
+
+    /**
+     * Sets the pointer to the next token and returns the old one.
+     *
+     * @return Twig_Token
+     */
+    public function next()
+    {
+        if (!isset($this->tokens[++$this->current])) {
+            throw new Twig_Error_Syntax('Unexpected end of template', $this->tokens[$this->current - 1]->getLine(), $this->filename);
+        }
+
+        return $this->tokens[$this->current - 1];
+    }
+
+    /**
+     * Tests a token and returns it or throws a syntax error.
+     *
+     * @return Twig_Token
+     */
+    public function expect($type, $value = null, $message = null)
+    {
+        $token = $this->tokens[$this->current];
+        if (!$token->test($type, $value)) {
+            $line = $token->getLine();
+            throw new Twig_Error_Syntax(sprintf('%sUnexpected token "%s" of value "%s" ("%s" expected%s)',
+                $message ? $message.'. ' : '',
+                Twig_Token::typeToEnglish($token->getType(), $line), $token->getValue(),
+                Twig_Token::typeToEnglish($type, $line), $value ? sprintf(' with value "%s"', $value) : ''),
+                $line,
+                $this->filename
+            );
+        }
+        $this->next();
+
+        return $token;
+    }
+
+    /**
+     * Looks at the next token.
+     *
+     * @param integer $number
+     *
+     * @return Twig_Token
+     */
+    public function look($number = 1)
+    {
+        if (!isset($this->tokens[$this->current + $number])) {
+            throw new Twig_Error_Syntax('Unexpected end of template', $this->tokens[$this->current + $number - 1]->getLine(), $this->filename);
+        }
+
+        return $this->tokens[$this->current + $number];
+    }
+
+    /**
+     * Tests the current token
+     *
+     * @return bool
+     */
+    public function test($primary, $secondary = null)
+    {
+        return $this->tokens[$this->current]->test($primary, $secondary);
+    }
+
+    /**
+     * Checks if end of stream was reached
+     *
+     * @return bool
+     */
+    public function isEOF()
+    {
+        return $this->tokens[$this->current]->getType() === Twig_Token::EOF_TYPE;
+    }
+
+    /**
+     * Gets the current token
+     *
+     * @return Twig_Token
+     */
+    public function getCurrent()
+    {
+        return $this->tokens[$this->current];
+    }
+
+    /**
+     * Gets the filename associated with this stream
+     *
+     * @return string
+     */
+    public function getFilename()
+    {
+        return $this->filename;
+    }
+}
diff --git a/inc/config.php b/inc/config.php
index 6e3f80b8..7470f0c3 100644
--- a/inc/config.php
+++ b/inc/config.php
@@ -9,65 +9,69 @@
  */
 
 define ('POCHE_VERSION', '0.3');
-
-if (!is_dir('db/')) {
-    @mkdir('db/',0705);
-}
-
 define ('MODE_DEMO', FALSE);
-define ('ABS_PATH', 'assets/');
-define ('CONVERT_LINKS_FOOTNOTES', TRUE);
-define ('REVERT_FORCED_PARAGRAPH_ELEMENTS',FALSE);
-define ('DOWNLOAD_PICTURES', TRUE);
+define ('CONVERT_LINKS_FOOTNOTES', FALSE);
+define ('REVERT_FORCED_PARAGRAPH_ELEMENTS', FALSE);
+define ('DOWNLOAD_PICTURES', FALSE);
 define ('SALT', '464v54gLLw928uz4zUBqkRJeiPY68zCX');
+define ('ABS_PATH', 'assets/');
+define ('TPL', './tpl');
+define ('LOCALE', './locale');
+define ('CACHE', './cache');
 define ('LANG', 'fr_FR.UTF8');
 
-putenv("LC_ALL=".LANG);
-setlocale(LC_ALL, LANG);
-bindtextdomain(LANG, "./locale"); 
-textdomain(LANG); 
-
 $storage_type = 'sqlite'; # sqlite or file
 
-include 'functions.php';
+# /!\ Be careful if you change the lines below /!\
+
+require_once 'pocheCore.php';
 require_once 'Readability.php';
 require_once 'Encoding.php';
-require_once 'rain.tpl.class.php';
-require_once 'MyTool.class.php';
+require_once 'pocheTool.class.php';
 require_once 'Session.class.php';
+require_once 'Twig/Autoloader.php';
 require_once 'store/store.class.php';
-require_once 'store/sqlite.class.php';
-require_once 'store/file.class.php';
-require_once 'class.messages.php';
+require_once 'store/' . $storage_type . '.class.php';
 
-Session::init();
+if (DOWNLOAD_PICTURES) {
+    require_once 'pochePicture.php';
+}
+
+# i18n
+putenv('LC_ALL=' . LANG);
+setlocale(LC_ALL, LANG);
+bindtextdomain(LANG, LOCALE); 
+textdomain(LANG); 
+
+# template engine
+Twig_Autoloader::register();
+$loader = new Twig_Loader_Filesystem(TPL);
+$twig = new Twig_Environment($loader, array(
+    'cache' => CACHE,
+));
+$twig->addExtension(new Twig_Extensions_Extension_I18n());
 
-$store     = new $storage_type();
-# initialisation de RainTPL
-raintpl::$tpl_dir   = './tpl/';
-raintpl::$cache_dir = './cache/';
-raintpl::$base_url  = get_poche_url();
-raintpl::configure('path_replace', false);
-raintpl::configure('debug', false);
-$tpl = new raintpl();
+Session::init();
+$store = new $storage_type();
 
+# installation
 if(!$store->isInstalled())
 {
-    logm('poche still not installed');
-    $tpl->draw('install');
+    pocheTool::logm('poche still not installed');
+    echo $twig->render('install.twig', array(
+        'token' => Session::getToken(),
+    ));
     if (isset($_GET['install'])) {
         if (($_POST['password'] == $_POST['password_repeat']) 
             && $_POST['password'] != "" && $_POST['login'] != "") {
+            # let's rock, install poche baby !
             $store->install($_POST['login'], encode_string($_POST['password'] . $_POST['login']));
             Session::logout();
-            MyTool::redirect();
+            pocheTool::redirect();
         }
     }
     exit();
 }
 
 $_SESSION['login'] = (isset ($_SESSION['login'])) ? $_SESSION['login'] : $store->getLogin();
-$_SESSION['pass']  = (isset ($_SESSION['pass'])) ? $_SESSION['pass'] : $store->getPassword();
-
-$msg = new Messages();
-$tpl->assign('msg', $msg);
\ No newline at end of file
+$_SESSION['pass']  = (isset ($_SESSION['pass'])) ? $_SESSION['pass'] : $store->getPassword();
\ No newline at end of file
diff --git a/inc/functions.php b/inc/functions.php
deleted file mode 100644
index ee26fbaa..00000000
--- a/inc/functions.php
+++ /dev/null
@@ -1,400 +0,0 @@
-<?php
-/**
- * poche, a read it later open source system
- *
- * @category   poche
- * @author     Nicolas Lœuillet <support@inthepoche.com>
- * @copyright  2013
- * @license    http://www.wtfpl.net/ see COPYING file
- */
-
-/**
- * Permet de générer l'URL de poche pour le bookmarklet
- */
-function get_poche_url()
-{
-    $protocol = "http";
-    if(isset($_SERVER['HTTPS'])) {
-        if($_SERVER['HTTPS'] != "off" && $_SERVER['HTTPS'] != "") {
-            $protocol = "https";
-        }
-    }
-
-    return $protocol . "://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
-}
-
-function encode_string($string) 
-{
-    return sha1($string . SALT);
-}
-
-// function define to retrieve url content
-function get_external_file($url)
-{
-    $timeout = 15;
-    // spoofing FireFox 18.0
-    $useragent="Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0";
-
-    if  (in_array  ('curl', get_loaded_extensions())) {
-        // Fetch feed from URL
-        $curl = curl_init();
-        curl_setopt($curl, CURLOPT_URL, $url);
-        curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
-        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
-        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
-        curl_setopt($curl, CURLOPT_HEADER, false);
-
-        // FOR SSL do not verified certificate
-        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
-        curl_setopt($curl, CURLOPT_AUTOREFERER, TRUE );
-
-        // FeedBurner requires a proper USER-AGENT...
-        curl_setopt($curl, CURL_HTTP_VERSION_1_1, true);
-        curl_setopt($curl, CURLOPT_ENCODING, "gzip, deflate");
-        curl_setopt($curl, CURLOPT_USERAGENT, $useragent);
-
-        $data = curl_exec($curl);
-
-        $httpcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
-
-        $httpcodeOK = isset($httpcode) and ($httpcode == 200 or $httpcode == 301);
-
-        curl_close($curl);
-    } else {
-
-        // create http context and add timeout and user-agent
-        $context = stream_context_create(array(
-                                'http'=>array('timeout' => $timeout,
-                                    'header'=> "User-Agent: ".$useragent,       /*spoot Mozilla Firefox*/
-                                    'follow_location' => true),
-                                // FOR SSL do not verified certificate
-                                'ssl' => array('verify_peer' => false,
-                                        'allow_self_signed' => true)
-                                )
-                            );
-
-        // only download page lesser than 4MB
-        $data = @file_get_contents($url, false, $context, -1, 4000000); // We download at most 4 MB from source.
-
-        if(isset($http_response_header) and isset($http_response_header[0])) {
-            $httpcodeOK = isset($http_response_header) and isset($http_response_header[0]) and ((strpos($http_response_header[0], '200 OK') !== FALSE) or (strpos($http_response_header[0], '301 Moved Permanently') !== FALSE));
-        }
-    }
-
-    // if response is not empty and response is OK
-    if (isset($data) and isset($httpcodeOK) and $httpcodeOK ) {
-
-        // take charset of page and get it
-        preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
-
-        // if meta tag is found
-        if (!empty($meta[0])) {
-            // retrieve encoding in $enc
-            preg_match('#charset="?(.*)"#si', $meta[0], $enc);
-
-            // if charset is found set it otherwise, set it to utf-8
-            $html_charset = (!empty($enc[1])) ? strtolower($enc[1]) : 'utf-8';
-
-        } else {
-            $html_charset = 'utf-8';
-            $enc[1] = '';
-        }
-
-        // replace charset of url to charset of page
-        $data = str_replace('charset='.$enc[1], 'charset='.$html_charset, $data);
-
-        return $data;
-    }
-    else {
-        return FALSE;
-    }
-}
-
-/**
- * Préparation de l'URL avec récupération du contenu avant insertion en base
- */
-function prepare_url($url)
-{
-    $parametres = array();
-    $url        = html_entity_decode(trim($url));
-
-    // We remove the annoying parameters added by FeedBurner and GoogleFeedProxy (?utm_source=...)
-    // from shaarli, by sebsauvage
-    $i=strpos($url,'&utm_source='); if ($i!==false) $url=substr($url,0,$i);
-    $i=strpos($url,'?utm_source='); if ($i!==false) $url=substr($url,0,$i);
-    $i=strpos($url,'#xtor=RSS-'); if ($i!==false) $url=substr($url,0,$i);
-
-    $title = $url;
-    $html = Encoding::toUTF8(get_external_file($url,15));
-    // If get_external_file if not able to retrieve HTTPS content try the same URL with HTTP protocol
-    if (!preg_match('!^https?://!i', $url) && (!isset($html) || strlen($html) <= 0)) {
-        $url = 'http://' . $url;
-        $html = Encoding::toUTF8(get_external_file($url,15));
-    }
-
-    if (function_exists('tidy_parse_string')) {
-        $tidy = tidy_parse_string($html, array(), 'UTF8');
-        $tidy->cleanRepair();
-        $html = $tidy->value;
-    }
-
-    if (isset($html) and strlen($html) > 0)
-    {
-        $r = new Readability($html, $url);
-
-        $r->convertLinksToFootnotes = CONVERT_LINKS_FOOTNOTES;
-        $r->revertForcedParagraphElements = REVERT_FORCED_PARAGRAPH_ELEMENTS;
-
-        if($r->init())
-        {
-            $content = $r->articleContent->innerHTML;
-            $parametres['title'] = $r->articleTitle->innerHTML;
-            $parametres['content'] = $content;
-            return $parametres;
-        }
-    }
-
-    return FALSE;
-}
-
-/**
- * On modifie les URLS des images dans le corps de l'article
- */
-function filtre_picture($content, $url, $id)
-{
-    $matches = array();
-    preg_match_all('#<\s*(img)[^>]+src="([^"]*)"[^>]*>#Si', $content, $matches, PREG_SET_ORDER);
-    foreach($matches as $i => $link)
-    {
-        $link[1] = trim($link[1]);
-        if (!preg_match('#^(([a-z]+://)|(\#))#', $link[1]) )
-        {
-            $absolute_path = get_absolute_link($link[2],$url);
-            $filename = basename(parse_url($absolute_path, PHP_URL_PATH));
-            $directory = create_assets_directory($id);
-            $fullpath = $directory . '/' . $filename;
-            download_pictures($absolute_path, $fullpath);
-            $content = str_replace($matches[$i][2], $fullpath, $content);
-        }
-
-    }
-
-    return $content;
-}
-
-/**
- * Retourne le lien absolu
- */
-function get_absolute_link($relative_link, $url)
-{
-    /* return if already absolute URL */
-    if (parse_url($relative_link, PHP_URL_SCHEME) != '') return $relative_link;
-
-    /* queries and anchors */
-    if ($relative_link[0]=='#' || $relative_link[0]=='?') return $url . $relative_link;
-
-    /* parse base URL and convert to local variables:
-       $scheme, $host, $path */
-    extract(parse_url($url));
-
-    /* remove non-directory element from path */
-    $path = preg_replace('#/[^/]*$#', '', $path);
-
-    /* destroy path if relative url points to root */
-    if ($relative_link[0] == '/') $path = '';
-
-    /* dirty absolute URL */
-    $abs = $host . $path . '/' . $relative_link;
-
-    /* replace '//' or '/./' or '/foo/../' with '/' */
-    $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
-    for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}
-
-    /* absolute URL is ready! */
-    return $scheme.'://'.$abs;
-}
-
-/**
- * Téléchargement des images
- */
-
-function download_pictures($absolute_path, $fullpath)
-{
-    $rawdata = get_external_file($absolute_path);
-
-    if(file_exists($fullpath)) {
-        unlink($fullpath);
-    }
-    $fp = fopen($fullpath, 'x');
-    fwrite($fp, $rawdata);
-    fclose($fp);
-}
-
-/**
- * Crée un répertoire de médias pour l'article
- */
-function create_assets_directory($id)
-{
-    $assets_path = ABS_PATH;
-    if(!is_dir($assets_path)) {
-        mkdir($assets_path, 0705);
-    }
-
-    $article_directory = $assets_path . $id;
-    if(!is_dir($article_directory)) {
-        mkdir($article_directory, 0705);
-    }
-
-    return $article_directory;
-}
-
-/**
- * Suppression du répertoire d'images
- */
-function remove_directory($directory)
-{
-    if(is_dir($directory)) {
-        $files = array_diff(scandir($directory), array('.','..'));
-        foreach ($files as $file) {
-            (is_dir("$directory/$file")) ? remove_directory("$directory/$file") : unlink("$directory/$file");
-        }
-        return rmdir($directory);
-    }
-}
-
-function display_view($view, $id = 0, $full_head = 'yes')
-{
-    global $tpl, $store, $msg;
-
-    switch ($view)
-    {
-        case 'export':
-            $entries = $store->retrieveAll();
-            $tpl->assign('export', myTool::renderJson($entries));
-            $tpl->draw('export');
-            logm('export view');
-            break;
-        case 'config':
-            $tpl->assign('load_all_js', 0);
-            $tpl->draw('head');
-            $tpl->draw('home');
-            $tpl->draw('config');
-            $tpl->draw('js');
-            $tpl->draw('footer');
-            logm('config view');
-            break;
-        case 'view':
-            $entry = $store->retrieveOneById($id);
-
-            if ($entry != NULL) {
-                $tpl->assign('id', $entry['id']);
-                $tpl->assign('url', $entry['url']);
-                $tpl->assign('title', $entry['title']);
-                $content = $entry['content'];
-                if (function_exists('tidy_parse_string')) {
-                    $tidy = tidy_parse_string($content, array('indent'=>true, 'show-body-only' => true), 'UTF8');
-                    $tidy->cleanRepair();
-                    $content = $tidy->value;
-                }
-                $tpl->assign('content', $content);
-                $tpl->assign('is_fav', $entry['is_fav']);
-                $tpl->assign('is_read', $entry['is_read']);
-                $tpl->assign('load_all_js', 0);
-                $tpl->draw('view');
-            }
-            else {
-                logm('error in view call : entry is NULL');
-            }
-
-            logm('view link #' . $id);
-            break;
-        default: # home view
-            $entries = $store->getEntriesByView($view);
-
-            $tpl->assign('entries', $entries);
-
-            if ($full_head == 'yes') {
-                $tpl->assign('load_all_js', 1);
-                $tpl->draw('head');
-                $tpl->draw('home');
-            }
-
-            $tpl->draw('entries');
-
-            if ($full_head == 'yes') {
-                $tpl->draw('js');
-                $tpl->draw('footer');
-            }
-            break;
-    }
-}
-
-/**
- * Appel d'une action (mark as fav, archive, delete)
- */
-function action_to_do($action, $url, $id = 0)
-{
-    global $store, $msg;
-
-    switch ($action)
-    {
-        case 'add':
-            if ($url == '')
-                continue;
-
-            $url = base64_decode($url);
-            error_log(print_r($url, TRUE));
-            if (MyTool::isUrl($url)) {
-                if($parametres_url = prepare_url($url)) {
-                    if ($store->add($url, $parametres_url['title'], $parametres_url['content'])) {
-                        $last_id = $store->getLastId();
-                        if (DOWNLOAD_PICTURES) {
-                            $content = filtre_picture($parametres_url['content'], $url, $last_id);
-                        }
-                        $msg->add('s', _('the link has been added successfully'));
-                    }
-                    else {
-                        $msg->add('e', _('error during insertion : the link wasn\'t added'));
-                    }
-                }
-                else {
-                    $msg->add('e', _('error during url preparation : the link wasn\'t added'));
-                    logm('error during url preparation');
-                }
-            }
-            else {
-                $msg->add('e', _('error during url preparation : the link is not valid'));
-                logm($url . ' is not a valid url');
-            }
-
-            logm('add link ' . $url);
-            break;
-        case 'delete':
-            if ($store->deleteById($id)) {
-                remove_directory(ABS_PATH . $id);
-                $msg->add('s', _('the link has been deleted successfully'));
-                logm('delete link #' . $id);
-            }
-            else {
-                $msg->add('e', _('the link wasn\'t deleted'));
-                logm('error : can\'t delete link #' . $id);
-            }
-            break;
-        case 'toggle_fav' :
-            $store->favoriteById($id);
-            logm('mark as favorite link #' . $id);
-            break;
-        case 'toggle_archive' :
-            $store->archiveById($id);
-            logm('archive link #' . $id);
-            break;
-        default:
-            break;
-    }
-}
-
-function logm($message)
-{
-    $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
-    file_put_contents('./log.txt',$t,FILE_APPEND);
-}
diff --git a/inc/poche/pocheCore.php b/inc/poche/pocheCore.php
new file mode 100644
index 00000000..52c603ac
--- /dev/null
+++ b/inc/poche/pocheCore.php
@@ -0,0 +1,257 @@
+<?php
+/**
+ * poche, a read it later open source system
+ *
+ * @category   poche
+ * @author     Nicolas Lœuillet <support@inthepoche.com>
+ * @copyright  2013
+ * @license    http://www.wtfpl.net/ see COPYING file
+ */
+
+function encode_string($string) 
+{
+    return sha1($string . SALT);
+}
+
+function get_external_file($url)
+{
+    $timeout = 15;
+    $useragent = "Mozilla/5.0 (Windows NT 5.1; rv:18.0) Gecko/20100101 Firefox/18.0";
+
+    if  (in_array ('curl', get_loaded_extensions())) {
+        # Fetch feed from URL
+        $curl = curl_init();
+        curl_setopt($curl, CURLOPT_URL, $url);
+        curl_setopt($curl, CURLOPT_TIMEOUT, $timeout);
+        curl_setopt($curl, CURLOPT_FOLLOWLOCATION, true);
+        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($curl, CURLOPT_HEADER, false);
+
+        # for ssl, do not verified certificate
+        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
+        curl_setopt($curl, CURLOPT_AUTOREFERER, TRUE );
+
+        # FeedBurner requires a proper USER-AGENT...
+        curl_setopt($curl, CURL_HTTP_VERSION_1_1, true);
+        curl_setopt($curl, CURLOPT_ENCODING, "gzip, deflate");
+        curl_setopt($curl, CURLOPT_USERAGENT, $useragent);
+
+        $data = curl_exec($curl);
+        $httpcode = curl_getinfo($curl, CURLINFO_HTTP_CODE);
+        $httpcodeOK = isset($httpcode) and ($httpcode == 200 or $httpcode == 301);
+        curl_close($curl);
+    } else {
+        # create http context and add timeout and user-agent
+        $context = stream_context_create(
+            array(
+                'http' => array(
+                    'timeout' => $timeout,
+                    'header' => "User-Agent: " . $useragent,
+                    'follow_location' => true
+                ),
+                'ssl' => array(
+                    'verify_peer' => false,
+                    'allow_self_signed' => true
+                )
+            )
+        );
+
+        # only download page lesser than 4MB
+        $data = @file_get_contents($url, false, $context, -1, 4000000); 
+
+        if (isset($http_response_header) and isset($http_response_header[0])) {
+            $httpcodeOK = isset($http_response_header) and isset($http_response_header[0]) and ((strpos($http_response_header[0], '200 OK') !== FALSE) or (strpos($http_response_header[0], '301 Moved Permanently') !== FALSE));
+        }
+    }
+
+    # if response is not empty and response is OK
+    if (isset($data) and isset($httpcodeOK) and $httpcodeOK) {
+
+        # take charset of page and get it
+        preg_match('#<meta .*charset=.*>#Usi', $data, $meta);
+
+        # if meta tag is found
+        if (!empty($meta[0])) {
+            preg_match('#charset="?(.*)"#si', $meta[0], $encoding);
+            # if charset is found set it otherwise, set it to utf-8
+            $html_charset = (!empty($encoding[1])) ? strtolower($encoding[1]) : 'utf-8';
+        } else {
+            $html_charset = 'utf-8';
+            $encoding[1] = '';
+        }
+
+        # replace charset of url to charset of page
+        $data = str_replace('charset=' . $encoding[1], 'charset=' . $html_charset, $data);
+
+        return $data;
+    }
+    else {
+        return FALSE;
+    }
+}
+
+function fetch_url_content($url)
+{
+    $url = base64_decode($url);
+    if (pocheTool::isUrl($url)) {
+        $url = pocheTool::cleanURL($url);
+        $html = Encoding::toUTF8(get_external_file($url));
+
+        # if get_external_file if not able to retrieve HTTPS content, try the same URL with HTTP protocol
+        if (!preg_match('!^https?://!i', $url) && (!isset($html) || strlen($html) <= 0)) {
+            $url = 'http://' . $url;
+            $html = Encoding::toUTF8(get_external_file($url));
+        }
+
+        if (function_exists('tidy_parse_string')) {
+            $tidy = tidy_parse_string($html, array(), 'UTF8');
+            $tidy->cleanRepair();
+            $html = $tidy->value;
+        }
+
+        $parameters = array();
+        if (isset($html) and strlen($html) > 0)
+        {
+            $readability = new Readability($html, $url);
+            $readability->convertLinksToFootnotes = CONVERT_LINKS_FOOTNOTES;
+            $readability->revertForcedParagraphElements = REVERT_FORCED_PARAGRAPH_ELEMENTS;
+
+            if($readability->init())
+            {
+                $content = $readability->articleContent->innerHTML;
+                $parameters['title'] = $readability->articleTitle->innerHTML;
+                $parameters['content'] = $content;
+
+                return $parameters;
+            }
+        }
+    }
+    else {
+        #$msg->add('e', _('error during url preparation : the link is not valid'));
+        pocheTool::logm($url . ' is not a valid url');
+    }
+
+    return FALSE;
+}
+
+function display_view($view, $id = 0, $full_head = 'yes')
+{
+    global $tpl, $store, $msg;
+
+    switch ($view)
+    {
+        case 'export':
+            $entries = $store->retrieveAll();
+            $tpl->assign('export', pocheTool::renderJson($entries));
+            $tpl->draw('export');
+            pocheTool::logm('export view');
+            break;
+        case 'config':
+            $tpl->assign('load_all_js', 0);
+            $tpl->draw('head');
+            $tpl->draw('home');
+            $tpl->draw('config');
+            $tpl->draw('js');
+            $tpl->draw('footer');
+            pocheTool::logm('config view');
+            break;
+        case 'view':
+            $entry = $store->retrieveOneById($id);
+
+            if ($entry != NULL) {
+                $tpl->assign('id', $entry['id']);
+                $tpl->assign('url', $entry['url']);
+                $tpl->assign('title', $entry['title']);
+                $content = $entry['content'];
+                if (function_exists('tidy_parse_string')) {
+                    $tidy = tidy_parse_string($content, array('indent'=>true, 'show-body-only' => true), 'UTF8');
+                    $tidy->cleanRepair();
+                    $content = $tidy->value;
+                }
+                $tpl->assign('content', $content);
+                $tpl->assign('is_fav', $entry['is_fav']);
+                $tpl->assign('is_read', $entry['is_read']);
+                $tpl->assign('load_all_js', 0);
+                $tpl->draw('view');
+            }
+            else {
+                pocheTool::logm('error in view call : entry is NULL');
+            }
+
+            pocheTool::logm('view link #' . $id);
+            break;
+        default: # home view
+            $entries = $store->getEntriesByView($view);
+
+            $tpl->assign('entries', $entries);
+
+            if ($full_head == 'yes') {
+                $tpl->assign('load_all_js', 1);
+                $tpl->draw('head');
+                $tpl->draw('home');
+            }
+
+            $tpl->draw('entries');
+
+            if ($full_head == 'yes') {
+                $tpl->draw('js');
+                $tpl->draw('footer');
+            }
+            break;
+    }
+}
+
+/**
+ * Appel d'une action (mark as fav, archive, delete)
+ */
+function action_to_do($action, $url, $id = 0)
+{
+    global $store, $msg;
+
+    switch ($action)
+    {
+        case 'add':
+            if($parametres_url = fetch_url_content($url)) {
+                if ($store->add($url, $parametres_url['title'], $parametres_url['content'])) {
+                    pocheTool::logm('add link ' . $url);
+                    $last_id = $store->getLastId();
+                    if (DOWNLOAD_PICTURES) {
+                        $content = filtre_picture($parametres_url['content'], $url, $last_id);
+                    }
+                    #$msg->add('s', _('the link has been added successfully'));
+                }
+                else {
+                    #$msg->add('e', _('error during insertion : the link wasn\'t added'));
+                    pocheTool::logm('error during insertion : the link wasn\'t added');
+                }
+            }
+            else {
+                #$msg->add('e', _('error during url preparation : the link wasn\'t added'));
+                pocheTool::logm('error during content fetch');
+            }
+            break;
+        case 'delete':
+            if ($store->deleteById($id)) {
+                if (DOWNLOAD_PICTURES) {
+                    remove_directory(ABS_PATH . $id);
+                }
+                #$msg->add('s', _('the link has been deleted successfully'));
+                pocheTool::logm('delete link #' . $id);
+            }
+            else {
+                #$msg->add('e', _('the link wasn\'t deleted'));
+                pocheTool::logm('error : can\'t delete link #' . $id);
+            }
+            break;
+        case 'toggle_fav' :
+            $store->favoriteById($id);
+            pocheTool::logm('mark as favorite link #' . $id);
+            break;
+        case 'toggle_archive' :
+            $store->archiveById($id);
+            pocheTool::logm('archive link #' . $id);
+            break;
+        default:
+            break;
+    }
+}
diff --git a/inc/poche/pochePictures.php b/inc/poche/pochePictures.php
new file mode 100644
index 00000000..bfc80657
--- /dev/null
+++ b/inc/poche/pochePictures.php
@@ -0,0 +1,114 @@
+<?php
+/**
+ * poche, a read it later open source system
+ *
+ * @category   poche
+ * @author     Nicolas Lœuillet <support@inthepoche.com>
+ * @copyright  2013
+ * @license    http://www.wtfpl.net/ see COPYING file
+ */
+
+/**
+ * On modifie les URLS des images dans le corps de l'article
+ */
+function filtre_picture($content, $url, $id)
+{
+    $matches = array();
+    preg_match_all('#<\s*(img)[^>]+src="([^"]*)"[^>]*>#Si', $content, $matches, PREG_SET_ORDER);
+    foreach($matches as $i => $link)
+    {
+        $link[1] = trim($link[1]);
+        if (!preg_match('#^(([a-z]+://)|(\#))#', $link[1]) )
+        {
+            $absolute_path = get_absolute_link($link[2],$url);
+            $filename = basename(parse_url($absolute_path, PHP_URL_PATH));
+            $directory = create_assets_directory($id);
+            $fullpath = $directory . '/' . $filename;
+            download_pictures($absolute_path, $fullpath);
+            $content = str_replace($matches[$i][2], $fullpath, $content);
+        }
+
+    }
+
+    return $content;
+}
+
+/**
+ * Retourne le lien absolu
+ */
+function get_absolute_link($relative_link, $url)
+{
+    /* return if already absolute URL */
+    if (parse_url($relative_link, PHP_URL_SCHEME) != '') return $relative_link;
+
+    /* queries and anchors */
+    if ($relative_link[0]=='#' || $relative_link[0]=='?') return $url . $relative_link;
+
+    /* parse base URL and convert to local variables:
+       $scheme, $host, $path */
+    extract(parse_url($url));
+
+    /* remove non-directory element from path */
+    $path = preg_replace('#/[^/]*$#', '', $path);
+
+    /* destroy path if relative url points to root */
+    if ($relative_link[0] == '/') $path = '';
+
+    /* dirty absolute URL */
+    $abs = $host . $path . '/' . $relative_link;
+
+    /* replace '//' or '/./' or '/foo/../' with '/' */
+    $re = array('#(/\.?/)#', '#/(?!\.\.)[^/]+/\.\./#');
+    for($n=1; $n>0; $abs=preg_replace($re, '/', $abs, -1, $n)) {}
+
+    /* absolute URL is ready! */
+    return $scheme.'://'.$abs;
+}
+
+/**
+ * Téléchargement des images
+ */
+
+function download_pictures($absolute_path, $fullpath)
+{
+    $rawdata = get_external_file($absolute_path);
+
+    if(file_exists($fullpath)) {
+        unlink($fullpath);
+    }
+    $fp = fopen($fullpath, 'x');
+    fwrite($fp, $rawdata);
+    fclose($fp);
+}
+
+/**
+ * Crée un répertoire de médias pour l'article
+ */
+function create_assets_directory($id)
+{
+    $assets_path = ABS_PATH;
+    if(!is_dir($assets_path)) {
+        mkdir($assets_path, 0705);
+    }
+
+    $article_directory = $assets_path . $id;
+    if(!is_dir($article_directory)) {
+        mkdir($article_directory, 0705);
+    }
+
+    return $article_directory;
+}
+
+/**
+ * Suppression du répertoire d'images
+ */
+function remove_directory($directory)
+{
+    if(is_dir($directory)) {
+        $files = array_diff(scandir($directory), array('.','..'));
+        foreach ($files as $file) {
+            (is_dir("$directory/$file")) ? remove_directory("$directory/$file") : unlink("$directory/$file");
+        }
+        return rmdir($directory);
+    }
+}
diff --git a/inc/pocheTool.class.php b/inc/poche/pocheTool.class.php
index 9aab76b9..cade115e 100644
--- a/inc/pocheTool.class.php
+++ b/inc/poche/pocheTool.class.php
@@ -38,8 +38,7 @@ class pocheTools
 
     public static function isUrl($url)
     {
-        // http://neo22s.com/check-if-url-exists-and-is-online-php/
-        $pattern='|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i';
+        $pattern = '|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i';
 
         return preg_match($pattern, $url);
     }
@@ -65,37 +64,61 @@ class pocheTools
             . $_SERVER["SERVER_NAME"] . $serverport . $scriptname;
     }
 
-    public static function renderJson($data)
+    public static function redirect($url = '')
     {
-        header('Cache-Control: no-cache, must-revalidate');
-        header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
-        header('Content-type: application/json; charset=UTF-8');
-
-        echo json_encode($data);
-        exit();
-    }
-
-    public static function redirect($rurl = '')
-    {
-        if ($rurl === '') {
-            $rurl = (empty($_SERVER['HTTP_REFERER'])?'?':$_SERVER['HTTP_REFERER']);
+        if ($url === '') {
+            $url = (empty($_SERVER['HTTP_REFERER'])?'?':$_SERVER['HTTP_REFERER']);
             if (isset($_POST['returnurl'])) {
-                $rurl = $_POST['returnurl'];
+                $url = $_POST['returnurl'];
             }
         }
 
-        // prevent loop
-        if (empty($rurl) || parse_url($rurl, PHP_URL_QUERY) === $_SERVER['QUERY_STRING']) {
-            $rurl = pocheTool::getUrl();
+        # prevent loop
+        if (empty($url) || parse_url($url, PHP_URL_QUERY) === $_SERVER['QUERY_STRING']) {
+            $url = pocheTool::getUrl();
         }
 
-        if (substr($rurl, 0, 1) !== '?') {
+        if (substr($url, 0, 1) !== '?') {
             $ref = pocheTool::getUrl();
-            if (substr($rurl, 0, strlen($ref)) !== $ref) {
-                $rurl = $ref;
+            if (substr($url, 0, strlen($ref)) !== $ref) {
+                $url = $ref;
             }
         }
-        header('Location: '.$rurl);
+        header('Location: '.$url);
         exit();
     }
+
+    public static function cleanURL($url)
+    {
+
+        $url = html_entity_decode(trim($url));
+
+        $stuff = strpos($url,'&utm_source=');
+        if ($stuff !== FALSE)
+            $url = substr($url, 0, $stuff);
+        $stuff = strpos($url,'?utm_source=');
+        if ($stuff !== FALSE)
+            $url = substr($url, 0, $stuff);
+        $stuff = strpos($url,'#xtor=RSS-');
+        if ($stuff !== FALSE)
+            $url = substr($url, 0, $stuff);
+
+        return $url;
+    }
+
+    public static function renderJson($data)
+    {
+        header('Cache-Control: no-cache, must-revalidate');
+        header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
+        header('Content-type: application/json; charset=UTF-8');
+
+        echo json_encode($data);
+        exit();
+    }
+
+    public static function logm($message)
+    {
+        $t = strval(date('Y/m/d_H:i:s')).' - '.$_SERVER["REMOTE_ADDR"].' - '.strval($message)."\n";
+        file_put_contents('./log.txt',$t,FILE_APPEND);
+    }
 }
\ No newline at end of file
diff --git a/inc/rain.tpl.class.php b/inc/rain.tpl.class.php
deleted file mode 100644
index 6522c798..00000000
--- a/inc/rain.tpl.class.php
+++ /dev/null
@@ -1,1043 +0,0 @@
-<?php
-
-/**
- *  RainTPL
- *  -------
- *  Realized by Federico Ulfo & maintained by the Rain Team
- *  Distributed under GNU/LGPL 3 License
- *
- *  @version 2.7.2
- */
-
-
-class RainTPL{
-
-        // -------------------------
-        //      CONFIGURATION
-        // -------------------------
-
-                /**
-                 * Template directory
-                 *
-                 * @var string
-                 */
-                static $tpl_dir = "tpl/";
-
-
-                /**
-                 * Cache directory. Is the directory where RainTPL will compile the template and save the cache
-                 *
-                 * @var string
-                 */
-                static $cache_dir = "tmp/";
-
-
-                /**
-                 * Template base URL. RainTPL will add this URL to the relative paths of element selected in $path_replace_list.
-                 *
-                 * @var string
-                 */
-                static $base_url = null;
-
-
-                /**
-                 * Template extension.
-                 *
-                 * @var string
-                 */
-                static $tpl_ext = "html";
-
-
-                /**
-                 * Path replace is a cool features that replace all relative paths of images (<img src="...">), stylesheet (<link href="...">), script (<script src="...">) and link (<a href="...">)
-                 * Set true to enable the path replace.
-                 *
-                 * @var unknown_type
-                 */
-                static $path_replace = true;
-
-
-                /**
-                 * You can set what the path_replace method will replace.
-                 * Avaible options: a, img, link, script, input
-                 *
-                 * @var array
-                 */
-                static $path_replace_list = array( 'a', 'img', 'link', 'script', 'input' );
-
-
-                /**
-                 * You can define in the black list what string are disabled into the template tags
-                 *
-                 * @var unknown_type
-                 */
-                static $black_list = array( '\$this', 'raintpl::', 'self::', '_SESSION', '_SERVER', '_ENV',  'eval', 'exec', 'unlink', 'rmdir' );
-
-
-                /**
-                 * Check template.
-                 * true: checks template update time, if changed it compile them
-                 * false: loads the compiled template. Set false if server doesn't have write permission for cache_directory.
-                 *
-                 */
-                static $check_template_update = true;
-
-
-                /**
-                 * PHP tags <? ?>
-                 * True: php tags are enabled into the template
-                 * False: php tags are disabled into the template and rendered as html
-                 *
-                 * @var bool
-                 */
-                static $php_enabled = true;
-
-
-                /**
-                 * Debug mode flag.
-                 * True: debug mode is used, syntax errors are displayed directly in template. Execution of script is not terminated.
-                 * False: exception is thrown on found error.
-                 *
-                 * @var bool
-                 */
-                static $debug = false;
-
-        // -------------------------
-
-
-        // -------------------------
-        //      RAINTPL VARIABLES
-        // -------------------------
-
-                /**
-                 * Is the array where RainTPL keep the variables assigned
-                 *
-                 * @var array
-                 */
-                public $var = array();
-
-                protected $tpl = array(),               // variables to keep the template directories and info
-                                  $cache = false,               // static cache enabled / disabled
-                  $cache_id = null;       // identify only one cache
-
-                protected static $config_name_sum = array();   // takes all the config to create the md5 of the file
-
-        // -------------------------
-
-
-
-        const CACHE_EXPIRE_TIME = 3600; // default cache expire time = hour
-
-
-
-        /**
-         * Assign variable
-         * eg.  $t->assign('name','mickey');
-         *
-         * @param mixed $variable_name Name of template variable or associative array name/value
-         * @param mixed $value value assigned to this variable. Not set if variable_name is an associative array
-         */
-
-        function assign( $variable, $value = null ){
-                if( is_array( $variable ) )
-                        $this->var += $variable;
-                else
-                        $this->var[ $variable ] = $value;
-        }
-
-
-
-        /**
-         * Draw the template
-         * eg.  $html = $tpl->draw( 'demo', TRUE ); // return template in string
-         * or   $tpl->draw( $tpl_name ); // echo the template
-         *
-         * @param string $tpl_name  template to load
-         * @param boolean $return_string  true=return a string, false=echo the template
-         * @return string
-         */
-
-        function draw( $tpl_name, $return_string = false ){
-
-                try {
-                        // compile the template if necessary and set the template filepath
-                        $this->check_template( $tpl_name );
-                } catch (RainTpl_Exception $e) {
-                        $output = $this->printDebug($e);
-                        die($output);
-                }
-
-                // Cache is off and, return_string is false
-        // Rain just echo the template
-
-        if( !$this->cache && !$return_string ){
-            extract( $this->var );
-            include $this->tpl['compiled_filename'];
-            unset( $this->tpl );
-        }
-
-
-                // cache or return_string are enabled
-        // rain get the output buffer to save the output in the cache or to return it as string
-
-        else{
-
-            //----------------------
-            // get the output buffer
-            //----------------------
-                ob_start();
-                extract( $this->var );
-                include $this->tpl['compiled_filename'];
-                $raintpl_contents = ob_get_clean();
-            //----------------------
-
-
-            // save the output in the cache
-            if( $this->cache )
-                file_put_contents( $this->tpl['cache_filename'], "<?php if(!class_exists('raintpl')){exit;}?>" . $raintpl_contents );
-
-            // free memory
-            unset( $this->tpl );
-
-            // return or print the template
-            if( $return_string ) return $raintpl_contents; else echo $raintpl_contents;
-
-        }
-
-        }
-
-
-
-        /**
-         * If exists a valid cache for this template it returns the cache
-         *
-         * @param string $tpl_name Name of template (set the same of draw)
-         * @param int $expiration_time Set after how many seconds the cache expire and must be regenerated
-         * @return string it return the HTML or null if the cache must be recreated
-         */
-
-        function cache( $tpl_name, $expire_time = self::CACHE_EXPIRE_TIME, $cache_id = null ){
-
-        // set the cache_id
-        $this->cache_id = $cache_id;
-
-                if( !$this->check_template( $tpl_name ) && file_exists( $this->tpl['cache_filename'] ) && ( time() - filemtime( $this->tpl['cache_filename'] ) < $expire_time ) )
-                        return substr( file_get_contents( $this->tpl['cache_filename'] ), 43 );
-                else{
-                        //delete the cache of the selected template
-            if (file_exists($this->tpl['cache_filename']))
-            unlink($this->tpl['cache_filename'] );
-                        $this->cache = true;
-                }
-        }
-
-
-
-        /**
-         * Configure the settings of RainTPL
-         *
-         */
-        static function configure( $setting, $value = null ){
-                if( is_array( $setting ) )
-                        foreach( $setting as $key => $value )
-                                self::configure( $key, $value );
-                else if( property_exists( __CLASS__, $setting ) ){
-                        self::$$setting = $value;
-            self::$config_name_sum[ $setting ] = $value; // take trace of all config
-        }
-        }
-
-
-
-        // check if has to compile the template
-        // return true if the template has changed
-        protected function check_template( $tpl_name ){
-
-                if( !isset($this->tpl['checked']) ){
-
-                        $tpl_basename                       = basename( $tpl_name );                                                                                                            // template basename
-                        $tpl_basedir                        = strpos($tpl_name,"/") ? dirname($tpl_name) . '/' : null;                                          // template basedirectory
-                        $tpl_dir                            = self::$tpl_dir . $tpl_basedir;                                                            // template directory
-                        $this->tpl['tpl_filename']          = $tpl_dir . $tpl_basename . '.' . self::$tpl_ext;  // template filename
-                        $temp_compiled_filename             = self::$cache_dir . $tpl_basename . "." . md5( $tpl_dir . serialize(self::$config_name_sum));
-                        $this->tpl['compiled_filename']     = $temp_compiled_filename . '.rtpl.php';    // cache filename
-                        $this->tpl['cache_filename']        = $temp_compiled_filename . '.s_' . $this->cache_id . '.rtpl.php';  // static cache filename
-
-                        // if the template doesn't exsist throw an error
-                        if( self::$check_template_update && !file_exists( $this->tpl['tpl_filename'] ) ){
-                                $e = new RainTpl_NotFoundException( 'Template '. $tpl_basename .' not found!' );
-                                throw $e->setTemplateFile($this->tpl['tpl_filename']);
-                        }
-
-                        // file doesn't exsist, or the template was updated, Rain will compile the template
-                        if( !file_exists( $this->tpl['compiled_filename'] ) || ( self::$check_template_update && filemtime($this->tpl['compiled_filename']) < filemtime( $this->tpl['tpl_filename'] ) ) ){
-                                $this->compileFile( $tpl_basename, $tpl_basedir, $this->tpl['tpl_filename'], self::$cache_dir, $this->tpl['compiled_filename'] );
-                                return true;
-                        }
-                        $this->tpl['checked'] = true;
-                }
-        }
-
-
-        /**
-        * execute stripslaches() on the xml block. Invoqued by preg_replace_callback function below
-        * @access protected
-        */
-        protected function xml_reSubstitution($capture) {
-                return "<?php echo '<?xml ".stripslashes($capture[1])." ?>'; ?>";
-        }
-
-        /**
-         * Compile and write the compiled template file
-         * @access protected
-         */
-        protected function compileFile( $tpl_basename, $tpl_basedir, $tpl_filename, $cache_dir, $compiled_filename ){
-
-                //read template file
-                $this->tpl['source'] = $template_code = file_get_contents( $tpl_filename );
-
-                //xml substitution
-                $template_code = preg_replace( "/<\?xml(.*?)\?>/s", "##XML\\1XML##", $template_code );
-
-                //disable php tag
-                if( !self::$php_enabled )
-                        $template_code = str_replace( array("<?","?>"), array("&lt;?","?&gt;"), $template_code );
-
-                //xml re-substitution
-                $template_code = preg_replace_callback ( "/##XML(.*?)XML##/s", array($this, 'xml_reSubstitution'), $template_code );
-
-                //compile template
-                $template_compiled = "<?php if(!class_exists('raintpl')){exit;}?>" . $this->compileTemplate( $template_code, $tpl_basedir );
-
-
-                // fix the php-eating-newline-after-closing-tag-problem
-                $template_compiled = str_replace( "?>\n", "?>\n\n", $template_compiled );
-
-                // create directories
-                if( !is_dir( $cache_dir ) )
-                        mkdir( $cache_dir, 0755, true );
-
-                if( !is_writable( $cache_dir ) )
-                        throw new RainTpl_Exception ('Cache directory ' . $cache_dir . 'doesn\'t have write permission. Set write permission or set RAINTPL_CHECK_TEMPLATE_UPDATE to false. More details on http://www.raintpl.com/Documentation/Documentation-for-PHP-developers/Configuration/');
-
-                //write compiled file
-                file_put_contents( $compiled_filename, $template_compiled );
-        }
-
-
-
-        /**
-         * Compile template
-         * @access protected
-         */
-        protected function compileTemplate( $template_code, $tpl_basedir ){
-
-                //tag list
-                $tag_regexp = array( 'loop'         => '(\{loop(?: name){0,1}="\${0,1}[^"]*"\})',
-                             'loop_close'   => '(\{\/loop\})',
-                             'if'           => '(\{if(?: condition){0,1}="[^"]*"\})',
-                             'elseif'       => '(\{elseif(?: condition){0,1}="[^"]*"\})',
-                             'else'         => '(\{else\})',
-                             'if_close'     => '(\{\/if\})',
-                             'function'     => '(\{function="[^"]*"\})',
-                             'noparse'      => '(\{noparse\})',
-                             'noparse_close'=> '(\{\/noparse\})',
-                             'ignore'       => '(\{ignore\}|\{\*)',
-                             'ignore_close'     => '(\{\/ignore\}|\*\})',
-                             'include'      => '(\{include="[^"]*"(?: cache="[^"]*")?\})',
-                             'template_info'=> '(\{\$template_info\})',
-                             'function'         => '(\{function="(\w*?)(?:.*?)"\})'
-                                                        );
-
-                $tag_regexp = "/" . join( "|", $tag_regexp ) . "/";
-
-                //split the code with the tags regexp
-                $template_code = preg_split ( $tag_regexp, $template_code, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY );
-
-                //path replace (src of img, background and href of link)
-                $template_code = $this->path_replace( $template_code, $tpl_basedir );
-
-                //compile the code
-                $compiled_code = $this->compileCode( $template_code );
-
-                //return the compiled code
-                return $compiled_code;
-
-        }
-
-
-
-        /**
-         * Compile the code
-         * @access protected
-         */
-        protected function compileCode( $parsed_code ){
-
-                //variables initialization
-                $compiled_code = $open_if = $comment_is_open = $ignore_is_open = null;
-        $loop_level = 0;
-
-                //read all parsed code
-                while( $html = array_shift( $parsed_code ) ){
-
-                        //close ignore tag
-                        if( !$comment_is_open && ( strpos( $html, '{/ignore}' ) !== FALSE || strpos( $html, '*}' ) !== FALSE ) )
-                                $ignore_is_open = false;
-
-                        //code between tag ignore id deleted
-                        elseif( $ignore_is_open ){
-                                //ignore the code
-                        }
-
-                        //close no parse tag
-                        elseif( strpos( $html, '{/noparse}' ) !== FALSE )
-                                $comment_is_open = false;
-
-                        //code between tag noparse is not compiled
-                        elseif( $comment_is_open )
-                                $compiled_code .= $html;
-
-                        //ignore
-                        elseif( strpos( $html, '{ignore}' ) !== FALSE || strpos( $html, '{*' ) !== FALSE )
-                                $ignore_is_open = true;
-
-                        //noparse
-                        elseif( strpos( $html, '{noparse}' ) !== FALSE )
-                                $comment_is_open = true;
-
-                        //include tag
-                        elseif( preg_match( '/\{include="([^"]*)"(?: cache="([^"]*)"){0,1}\}/', $html, $code ) ){
-
-                                //variables substitution
-                                $include_var = $this->var_replace( $code[ 1 ], $left_delimiter = null, $right_delimiter = null, $php_left_delimiter = '".' , $php_right_delimiter = '."', $loop_level );
-
-                                // if the cache is active
-                                if( isset($code[ 2 ]) ){
-
-                                        //dynamic include
-                                        $compiled_code .= '<?php $tpl = new '.get_class($this).';' .
-                                                                 'if( $cache = $tpl->cache( $template = basename("'.$include_var.'") ) )' .
-                                                                 '      echo $cache;' .
-                                                                 'else{' .
-                                                                 '      $tpl_dir_temp = self::$tpl_dir;' .
-                                                                 '      $tpl->assign( $this->var );' .
-                                                                        ( !$loop_level ? null : '$tpl->assign( "key", $key'.$loop_level.' ); $tpl->assign( "value", $value'.$loop_level.' );' ).
-                                                                 '      $tpl->draw( dirname("'.$include_var.'") . ( substr("'.$include_var.'",-1,1) != "/" ? "/" : "" ) . basename("'.$include_var.'") );'.
-                                                                 '} ?>';
-                                }
-                                else{
-
-                                        //dynamic include
-                                        $compiled_code .= '<?php $tpl = new '.get_class($this).';' .
-                                                                          '$tpl_dir_temp = self::$tpl_dir;' .
-                                                                          '$tpl->assign( $this->var );' .
-                                                                          ( !$loop_level ? null : '$tpl->assign( "key", $key'.$loop_level.' ); $tpl->assign( "value", $value'.$loop_level.' );' ).
-                                                                          '$tpl->draw( dirname("'.$include_var.'") . ( substr("'.$include_var.'",-1,1) != "/" ? "/" : "" ) . basename("'.$include_var.'") );'.
-                                                                          '?>';
-
-
-                                }
-
-                        }
-
-                        //loop
-                        elseif( preg_match( '/\{loop(?: name){0,1}="\${0,1}([^"]*)"\}/', $html, $code ) ){
-
-                                //increase the loop counter
-                                $loop_level++;
-
-                                //replace the variable in the loop
-                                $var = $this->var_replace( '$' . $code[ 1 ], $tag_left_delimiter=null, $tag_right_delimiter=null, $php_left_delimiter=null, $php_right_delimiter=null, $loop_level-1 );
-
-                                //loop variables
-                                $counter = "\$counter$loop_level";       // count iteration
-                                $key = "\$key$loop_level";               // key
-                                $value = "\$value$loop_level";           // value
-
-                                //loop code
-                                $compiled_code .=  "<?php $counter=-1; if( isset($var) && is_array($var) && sizeof($var) ) foreach( $var as $key => $value ){ $counter++; ?>";
-
-                        }
-
-                        //close loop tag
-                        elseif( strpos( $html, '{/loop}' ) !== FALSE ) {
-
-                                //iterator
-                                $counter = "\$counter$loop_level";
-
-                                //decrease the loop counter
-                                $loop_level--;
-
-                                //close loop code
-                                $compiled_code .=  "<?php } ?>";
-
-                        }
-
-                        //if
-                        elseif( preg_match( '/\{if(?: condition){0,1}="([^"]*)"\}/', $html, $code ) ){
-
-                                //increase open if counter (for intendation)
-                                $open_if++;
-
-                                //tag
-                                $tag = $code[ 0 ];
-
-                                //condition attribute
-                                $condition = $code[ 1 ];
-
-                                // check if there's any function disabled by black_list
-                                $this->function_check( $tag );
-
-                                //variable substitution into condition (no delimiter into the condition)
-                                $parsed_condition = $this->var_replace( $condition, $tag_left_delimiter = null, $tag_right_delimiter = null, $php_left_delimiter = null, $php_right_delimiter = null, $loop_level );
-
-                                //if code
-                                $compiled_code .=   "<?php if( $parsed_condition ){ ?>";
-
-                        }
-
-                        //elseif
-                        elseif( preg_match( '/\{elseif(?: condition){0,1}="([^"]*)"\}/', $html, $code ) ){
-
-                                //tag
-                                $tag = $code[ 0 ];
-
-                                //condition attribute
-                                $condition = $code[ 1 ];
-
-                                //variable substitution into condition (no delimiter into the condition)
-                                $parsed_condition = $this->var_replace( $condition, $tag_left_delimiter = null, $tag_right_delimiter = null, $php_left_delimiter = null, $php_right_delimiter = null, $loop_level );
-
-                                //elseif code
-                                $compiled_code .=   "<?php }elseif( $parsed_condition ){ ?>";
-                        }
-
-                        //else
-                        elseif( strpos( $html, '{else}' ) !== FALSE ) {
-
-                                //else code
-                                $compiled_code .=   '<?php }else{ ?>';
-
-                        }
-
-                        //close if tag
-                        elseif( strpos( $html, '{/if}' ) !== FALSE ) {
-
-                                //decrease if counter
-                                $open_if--;
-
-                                // close if code
-                                $compiled_code .=   '<?php } ?>';
-
-                        }
-
-                        //function
-                        elseif( preg_match( '/\{function="(\w*)(.*?)"\}/', $html, $code ) ){
-
-                                //tag
-                                $tag = $code[ 0 ];
-
-                                //function
-                                $function = $code[ 1 ];
-
-                                // check if there's any function disabled by black_list
-                                $this->function_check( $tag );
-
-                                if( empty( $code[ 2 ] ) )
-                                        $parsed_function = $function . "()";
-                                else
-                                        // parse the function
-                                        $parsed_function = $function . $this->var_replace( $code[ 2 ], $tag_left_delimiter = null, $tag_right_delimiter = null, $php_left_delimiter = null, $php_right_delimiter = null, $loop_level );
-
-                                //if code
-                                $compiled_code .=   "<?php echo $parsed_function; ?>";
-                        }
-
-                        // show all vars
-                        elseif ( strpos( $html, '{$template_info}' ) !== FALSE ) {
-
-                                //tag
-                                $tag  = '{$template_info}';
-
-                                //if code
-                                $compiled_code .=   '<?php echo "<pre>"; print_r( $this->var ); echo "</pre>"; ?>';
-                        }
-
-
-                        //all html code
-                        else{
-
-                                //variables substitution (es. {$title})
-                                $html = $this->var_replace( $html, $left_delimiter = '\{', $right_delimiter = '\}', $php_left_delimiter = '<?php ', $php_right_delimiter = ';?>', $loop_level, $echo = true );
-                                //const substitution (es. {#CONST#})
-                                $html = $this->const_replace( $html, $left_delimiter = '\{', $right_delimiter = '\}', $php_left_delimiter = '<?php ', $php_right_delimiter = ';?>', $loop_level, $echo = true );
-                                //functions substitution (es. {"string"|functions})
-                                $compiled_code .= $this->func_replace( $html, $left_delimiter = '\{', $right_delimiter = '\}', $php_left_delimiter = '<?php ', $php_right_delimiter = ';?>', $loop_level, $echo = true );
-                        }
-                }
-
-                if( $open_if > 0 ) {
-                        $e = new RainTpl_SyntaxException('Error! You need to close an {if} tag in ' . $this->tpl['tpl_filename'] . ' template');
-                        throw $e->setTemplateFile($this->tpl['tpl_filename']);
-                }
-                return $compiled_code;
-        }
-
-
-        /**
-         * Reduce a path, eg. www/library/../filepath//file => www/filepath/file
-         * @param type $path
-         * @return type
-         */
-        protected function reduce_path( $path ){
-                $path = str_replace( "://", "@not_replace@", $path );
-                $path = str_replace( "//", "/", $path );
-                $path = str_replace( "@not_replace@", "://", $path );
-                return preg_replace('/\w+\/\.\.\//', '', $path );
-        }
-
-
-
-        /**
-         * replace the path of image src, link href and a href.
-         * url => template_dir/url
-         * url# => url
-         * http://url => http://url
-         *
-         * @param string $html
-         * @return string html sostituito
-         */
-        protected function path_replace( $html, $tpl_basedir ){
-
-                if( self::$path_replace ){
-
-                        $tpl_dir = self::$base_url . self::$tpl_dir . $tpl_basedir;
-
-                        // reduce the path
-                        $path = $this->reduce_path($tpl_dir);
-
-                        $exp = $sub = array();
-
-                        if( in_array( "img", self::$path_replace_list ) ){
-                                $exp = array( '/<img(.*?)src=(?:")(http|https)\:\/\/([^"]+?)(?:")/i', '/<img(.*?)src=(?:")([^"]+?)#(?:")/i', '/<img(.*?)src="(.*?)"/', '/<img(.*?)src=(?:\@)([^"]+?)(?:\@)/i' );
-                                $sub = array( '<img$1src=@$2://$3@', '<img$1src=@$2@', '<img$1src="' . $path . '$2"', '<img$1src="$2"' );
-                        }
-
-                        if( in_array( "script", self::$path_replace_list ) ){
-                                $exp = array_merge( $exp , array( '/<script(.*?)src=(?:")(http|https)\:\/\/([^"]+?)(?:")/i', '/<script(.*?)src=(?:")([^"]+?)#(?:")/i', '/<script(.*?)src="(.*?)"/', '/<script(.*?)src=(?:\@)([^"]+?)(?:\@)/i' ) );
-                                $sub = array_merge( $sub , array( '<script$1src=@$2://$3@', '<script$1src=@$2@', '<script$1src="' . $path . '$2"', '<script$1src="$2"' ) );
-                        }
-
-                        if( in_array( "link", self::$path_replace_list ) ){
-                                $exp = array_merge( $exp , array( '/<link(.*?)href=(?:")(http|https)\:\/\/([^"]+?)(?:")/i', '/<link(.*?)href=(?:")([^"]+?)#(?:")/i', '/<link(.*?)href="(.*?)"/', '/<link(.*?)href=(?:\@)([^"]+?)(?:\@)/i' ) );
-                                $sub = array_merge( $sub , array( '<link$1href=@$2://$3@', '<link$1href=@$2@' , '<link$1href="' . $path . '$2"', '<link$1href="$2"' ) );
-                        }
-
-                        if( in_array( "a", self::$path_replace_list ) ){
-                                $exp = array_merge( $exp , array( '/<a(.*?)href=(?:")(http\:\/\/|https\:\/\/|javascript:)([^"]+?)(?:")/i', '/<a(.*?)href="(.*?)"/', '/<a(.*?)href=(?:\@)([^"]+?)(?:\@)/i'  ) );
-                                $sub = array_merge( $sub , array( '<a$1href=@$2$3@', '<a$1href="' . self::$base_url . '$2"', '<a$1href="$2"' ) );
-                        }
-
-                        if( in_array( "input", self::$path_replace_list ) ){
-                                $exp = array_merge( $exp , array( '/<input(.*?)src=(?:")(http|https)\:\/\/([^"]+?)(?:")/i', '/<input(.*?)src=(?:")([^"]+?)#(?:")/i', '/<input(.*?)src="(.*?)"/', '/<input(.*?)src=(?:\@)([^"]+?)(?:\@)/i' ) );
-                                $sub = array_merge( $sub , array( '<input$1src=@$2://$3@', '<input$1src=@$2@', '<input$1src="' . $path . '$2"', '<input$1src="$2"' ) );
-                        }
-
-                        return preg_replace( $exp, $sub, $html );
-
-                }
-                else
-                        return $html;
-
-        }
-
-
-
-
-
-        // replace const
-        function const_replace( $html, $tag_left_delimiter, $tag_right_delimiter, $php_left_delimiter = null, $php_right_delimiter = null, $loop_level = null, $echo = null ){
-                // const
-                return preg_replace( '/\{\#(\w+)\#{0,1}\}/', $php_left_delimiter . ( $echo ? " echo " : null ) . '\\1' . $php_right_delimiter, $html );
-        }
-
-
-
-        // replace functions/modifiers on constants and strings
-        function func_replace( $html, $tag_left_delimiter, $tag_right_delimiter, $php_left_delimiter = null, $php_right_delimiter = null, $loop_level = null, $echo = null ){
-
-                preg_match_all( '/' . '\{\#{0,1}(\"{0,1}.*?\"{0,1})(\|\w.*?)\#{0,1}\}' . '/', $html, $matches );
-
-                for( $i=0, $n=count($matches[0]); $i<$n; $i++ ){
-
-                        //complete tag ex: {$news.title|substr:0,100}
-                        $tag = $matches[ 0 ][ $i ];
-
-                        //variable name ex: news.title
-                        $var = $matches[ 1 ][ $i ];
-
-                        //function and parameters associate to the variable ex: substr:0,100
-                        $extra_var = $matches[ 2 ][ $i ];
-
-                        // check if there's any function disabled by black_list
-                        $this->function_check( $tag );
-
-                        $extra_var = $this->var_replace( $extra_var, null, null, null, null, $loop_level );
-
-
-                        // check if there's an operator = in the variable tags, if there's this is an initialization so it will not output any value
-                        $is_init_variable = preg_match( "/^(\s*?)\=[^=](.*?)$/", $extra_var );
-
-                        //function associate to variable
-                        $function_var = ( $extra_var and $extra_var[0] == '|') ? substr( $extra_var, 1 ) : null;
-
-                        //variable path split array (ex. $news.title o $news[title]) or object (ex. $news->title)
-                        $temp = preg_split( "/\.|\[|\-\>/", $var );
-
-                        //variable name
-                        $var_name = $temp[ 0 ];
-
-                        //variable path
-                        $variable_path = substr( $var, strlen( $var_name ) );
-
-                        //parentesis transform [ e ] in [" e in "]
-                        $variable_path = str_replace( '[', '["', $variable_path );
-                        $variable_path = str_replace( ']', '"]', $variable_path );
-
-                        //transform .$variable in ["$variable"]
-                        $variable_path = preg_replace('/\.\$(\w+)/', '["$\\1"]', $variable_path );
-
-                        //transform [variable] in ["variable"]
-                        $variable_path = preg_replace('/\.(\w+)/', '["\\1"]', $variable_path );
-
-                        //if there's a function
-                        if( $function_var ){
-
-                // check if there's a function or a static method and separate, function by parameters
-                                $function_var = str_replace("::", "@double_dot@", $function_var );
-
-                // get the position of the first :
-                if( $dot_position = strpos( $function_var, ":" ) ){
-
-                    // get the function and the parameters
-                    $function = substr( $function_var, 0, $dot_position );
-                    $params = substr( $function_var, $dot_position+1 );
-
-                }
-                else{
-
-                    //get the function
-                    $function = str_replace( "@double_dot@", "::", $function_var );
-                    $params = null;
-
-                }
-
-                // replace back the @double_dot@ with ::
-                $function = str_replace( "@double_dot@", "::", $function );
-                $params = str_replace( "@double_dot@", "::", $params );
-
-
-                        }
-                        else
-                                $function = $params = null;
-
-                        $php_var = $var_name . $variable_path;
-
-                        // compile the variable for php
-                        if( isset( $function ) ){
-                                if( $php_var )
-                                        $php_var = $php_left_delimiter . ( !$is_init_variable && $echo ? 'echo ' : null ) . ( $params ? "( $function( $php_var, $params ) )" : "$function( $php_var )" ) . $php_right_delimiter;
-                                else
-                                        $php_var = $php_left_delimiter . ( !$is_init_variable && $echo ? 'echo ' : null ) . ( $params ? "( $function( $params ) )" : "$function()" ) . $php_right_delimiter;
-                        }
-                        else
-                                $php_var = $php_left_delimiter . ( !$is_init_variable && $echo ? 'echo ' : null ) . $php_var . $extra_var . $php_right_delimiter;
-
-                        $html = str_replace( $tag, $php_var, $html );
-
-                }
-
-                return $html;
-
-        }
-
-
-
-        function var_replace( $html, $tag_left_delimiter, $tag_right_delimiter, $php_left_delimiter = null, $php_right_delimiter = null, $loop_level = null, $echo = null ){
-
-                //all variables
-                if( preg_match_all( '/' . $tag_left_delimiter . '\$(\w+(?:\.\${0,1}[A-Za-z0-9_]+)*(?:(?:\[\${0,1}[A-Za-z0-9_]+\])|(?:\-\>\${0,1}[A-Za-z0-9_]+))*)(.*?)' . $tag_right_delimiter . '/', $html, $matches ) ){
-
-                    for( $parsed=array(), $i=0, $n=count($matches[0]); $i<$n; $i++ )
-                        $parsed[$matches[0][$i]] = array('var'=>$matches[1][$i],'extra_var'=>$matches[2][$i]);
-
-                    foreach( $parsed as $tag => $array ){
-
-                            //variable name ex: news.title
-                            $var = $array['var'];
-
-                            //function and parameters associate to the variable ex: substr:0,100
-                            $extra_var = $array['extra_var'];
-
-                            // check if there's any function disabled by black_list
-                            $this->function_check( $tag );
-
-                            $extra_var = $this->var_replace( $extra_var, null, null, null, null, $loop_level );
-
-                            // check if there's an operator = in the variable tags, if there's this is an initialization so it will not output any value
-                            $is_init_variable = preg_match( "/^[a-z_A-Z\.\[\](\-\>)]*=[^=]*$/", $extra_var );
-
-                            //function associate to variable
-                            $function_var = ( $extra_var and $extra_var[0] == '|') ? substr( $extra_var, 1 ) : null;
-
-                            //variable path split array (ex. $news.title o $news[title]) or object (ex. $news->title)
-                            $temp = preg_split( "/\.|\[|\-\>/", $var );
-
-                            //variable name
-                            $var_name = $temp[ 0 ];
-
-                            //variable path
-                            $variable_path = substr( $var, strlen( $var_name ) );
-
-                            //parentesis transform [ e ] in [" e in "]
-                            $variable_path = str_replace( '[', '["', $variable_path );
-                            $variable_path = str_replace( ']', '"]', $variable_path );
-
-                            //transform .$variable in ["$variable"] and .variable in ["variable"]
-                            $variable_path = preg_replace('/\.(\${0,1}\w+)/', '["\\1"]', $variable_path );
-
-                            // if is an assignment also assign the variable to $this->var['value']
-                            if( $is_init_variable )
-                                $extra_var = "=\$this->var['{$var_name}']{$variable_path}" . $extra_var;
-
-
-
-                            //if there's a function
-                            if( $function_var ){
-
-                                    // check if there's a function or a static method and separate, function by parameters
-                                    $function_var = str_replace("::", "@double_dot@", $function_var );
-
-
-                                    // get the position of the first :
-                                    if( $dot_position = strpos( $function_var, ":" ) ){
-
-                                        // get the function and the parameters
-                                        $function = substr( $function_var, 0, $dot_position );
-                                        $params = substr( $function_var, $dot_position+1 );
-
-                                    }
-                                    else{
-
-                                        //get the function
-                                        $function = str_replace( "@double_dot@", "::", $function_var );
-                                        $params = null;
-
-                                    }
-
-                                    // replace back the @double_dot@ with ::
-                                    $function = str_replace( "@double_dot@", "::", $function );
-                                    $params = str_replace( "@double_dot@", "::", $params );
-                            }
-                            else
-                                    $function = $params = null;
-
-                            //if it is inside a loop
-                            if( $loop_level ){
-                                    //verify the variable name
-                                    if( $var_name == 'key' )
-                                            $php_var = '$key' . $loop_level;
-                                    elseif( $var_name == 'value' )
-                                            $php_var = '$value' . $loop_level . $variable_path;
-                                    elseif( $var_name == 'counter' )
-                                            $php_var = '$counter' . $loop_level;
-                                    else
-                                            $php_var = '$' . $var_name . $variable_path;
-                            }else
-                                    $php_var = '$' . $var_name . $variable_path;
-
-                            // compile the variable for php
-                            if( isset( $function ) )
-                                    $php_var = $php_left_delimiter . ( !$is_init_variable && $echo ? 'echo ' : null ) . ( $params ? "( $function( $php_var, $params ) )" : "$function( $php_var )" ) . $php_right_delimiter;
-                            else
-                                    $php_var = $php_left_delimiter . ( !$is_init_variable && $echo ? 'echo ' : null ) . $php_var . $extra_var . $php_right_delimiter;
-
-                            $html = str_replace( $tag, $php_var, $html );
-
-
-                    }
-                }
-
-                return $html;
-        }
-
-
-
-        /**
-         * Check if function is in black list (sandbox)
-         *
-         * @param string $code
-         * @param string $tag
-         */
-        protected function function_check( $code ){
-
-                $preg = '#(\W|\s)' . implode( '(\W|\s)|(\W|\s)', self::$black_list ) . '(\W|\s)#';
-
-                // check if the function is in the black list (or not in white list)
-                if( count(self::$black_list) && preg_match( $preg, $code, $match ) ){
-
-                        // find the line of the error
-                        $line = 0;
-                        $rows=explode("\n",$this->tpl['source']);
-                        while( !strpos($rows[$line],$code) )
-                                $line++;
-
-                        // stop the execution of the script
-                        $e = new RainTpl_SyntaxException('Unallowed syntax in ' . $this->tpl['tpl_filename'] . ' template');
-                        throw $e->setTemplateFile($this->tpl['tpl_filename'])
-                                ->setTag($code)
-                                ->setTemplateLine($line);
-                }
-
-        }
-
-        /**
-         * Prints debug info about exception or passes it further if debug is disabled.
-         *
-         * @param RainTpl_Exception $e
-         * @return string
-         */
-        protected function printDebug(RainTpl_Exception $e){
-                if (!self::$debug) {
-                        throw $e;
-                }
-                $output = sprintf('<h2>Exception: %s</h2><h3>%s</h3><p>template: %s</p>',
-                        get_class($e),
-                        $e->getMessage(),
-                        $e->getTemplateFile()
-                );
-                if ($e instanceof RainTpl_SyntaxException) {
-                        if (null != $e->getTemplateLine()) {
-                                $output .= '<p>line: ' . $e->getTemplateLine() . '</p>';
-                        }
-                        if (null != $e->getTag()) {
-                                $output .= '<p>in tag: ' . htmlspecialchars($e->getTag()) . '</p>';
-                        }
-                        if (null != $e->getTemplateLine() && null != $e->getTag()) {
-                                $rows=explode("\n",  htmlspecialchars($this->tpl['source']));
-                                $rows[$e->getTemplateLine()] = '<font color=red>' . $rows[$e->getTemplateLine()] . '</font>';
-                                $output .= '<h3>template code</h3>' . implode('<br />', $rows) . '</pre>';
-                        }
-                }
-                $output .= sprintf('<h3>trace</h3><p>In %s on line %d</p><pre>%s</pre>',
-                        $e->getFile(), $e->getLine(),
-                        nl2br(htmlspecialchars($e->getTraceAsString()))
-                );
-                return $output;
-        }
-}
-
-
-/**
- * Basic Rain tpl exception.
- */
-class RainTpl_Exception extends Exception{
-        /**
-         * Path of template file with error.
-         */
-        protected $templateFile = '';
-
-        /**
-         * Returns path of template file with error.
-         *
-         * @return string
-         */
-        public function getTemplateFile()
-        {
-                return $this->templateFile;
-        }
-
-        /**
-         * Sets path of template file with error.
-         *
-         * @param string $templateFile
-         * @return RainTpl_Exception
-         */
-        public function setTemplateFile($templateFile)
-        {
-                $this->templateFile = (string) $templateFile;
-                return $this;
-        }
-}
-
-/**
- * Exception thrown when template file does not exists.
- */
-class RainTpl_NotFoundException extends RainTpl_Exception{
-}
-
-/**
- * Exception thrown when syntax error occurs.
- */
-class RainTpl_SyntaxException extends RainTpl_Exception{
-        /**
-         * Line in template file where error has occured.
-         *
-         * @var int | null
-         */
-        protected $templateLine = null;
-
-        /**
-         * Tag which caused an error.
-         *
-         * @var string | null
-         */
-        protected $tag = null;
-
-        /**
-         * Returns line in template file where error has occured
-         * or null if line is not defined.
-         *
-         * @return int | null
-         */
-        public function getTemplateLine()
-        {
-                return $this->templateLine;
-        }
-
-        /**
-         * Sets  line in template file where error has occured.
-         *
-         * @param int $templateLine
-         * @return RainTpl_SyntaxException
-         */
-        public function setTemplateLine($templateLine)
-        {
-                $this->templateLine = (int) $templateLine;
-                return $this;
-        }
-
-        /**
-         * Returns tag which caused an error.
-         *
-         * @return string
-         */
-        public function getTag()
-        {
-                return $this->tag;
-        }
-
-        /**
-         * Sets tag which caused an error.
-         *
-         * @param string $tag
-         * @return RainTpl_SyntaxException
-         */
-        public function setTag($tag)
-        {
-                $this->tag = (string) $tag;
-                return $this;
-        }
-}
-
-// -- end