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NodeTraverser.php
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<?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 calls the given visitor for each. * * @author Fabien Potencier <fabien@symfony.com> */ class Twig_NodeTraverser { protected $env; protected $visitors = array(); /** * Constructor. * * @param Twig_Environment $env A Twig_Environment instance * @param Twig_NodeVisitorInterface[] $visitors An array of Twig_NodeVisitorInterface instances */ public function __construct(Twig_Environment $env, array $visitors = array()) { $this->env = $env; foreach ($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 * * @return Twig_NodeInterface */ 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; } $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); } }
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