From a4565e88edbc8e3bd092a475469769c86a4c350c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Nicolas=20L=C5=93uillet?= Date: Fri, 2 Aug 2013 22:40:51 +0200 Subject: add Twig & refactor poche --- inc/Twig/Parser.php | 394 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 394 insertions(+) create mode 100644 inc/Twig/Parser.php (limited to 'inc/Twig/Parser.php') 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 @@ + + */ +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; + } +} -- cgit v1.2.3