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<?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;
}
}
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