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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Twig_NodeTraverser is a node traverser.
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*
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* It visits all nodes and their children and call the given visitor for each.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_NodeTraverser
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{
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protected $env;
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protected $visitors;
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/**
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* Constructor.
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*
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* @param Twig_Environment $env A Twig_Environment instance
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* @param array $visitors An array of Twig_NodeVisitorInterface instances
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*/
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public function __construct(Twig_Environment $env, array $visitors = array())
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{
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$this->env = $env;
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$this->visitors = array();
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foreach ($visitors as $visitor) {
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$this->addVisitor($visitor);
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}
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}
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/**
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* Adds a visitor.
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*
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* @param Twig_NodeVisitorInterface $visitor A Twig_NodeVisitorInterface instance
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*/
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public function addVisitor(Twig_NodeVisitorInterface $visitor)
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{
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if (!isset($this->visitors[$visitor->getPriority()])) {
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$this->visitors[$visitor->getPriority()] = array();
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}
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$this->visitors[$visitor->getPriority()][] = $visitor;
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}
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/**
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* Traverses a node and calls the registered visitors.
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*
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* @param Twig_NodeInterface $node A Twig_NodeInterface instance
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*/
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public function traverse(Twig_NodeInterface $node)
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{
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ksort($this->visitors);
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foreach ($this->visitors as $visitors) {
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foreach ($visitors as $visitor) {
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$node = $this->traverseForVisitor($visitor, $node);
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}
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}
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return $node;
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}
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protected function traverseForVisitor(Twig_NodeVisitorInterface $visitor, Twig_NodeInterface $node = null)
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{
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if (null === $node) {
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return null;
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}
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$node = $visitor->enterNode($node, $this->env);
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foreach ($node as $k => $n) {
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if (false !== $n = $this->traverseForVisitor($visitor, $n)) {
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$node->setNode($k, $n);
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} else {
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$node->removeNode($k);
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}
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}
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return $visitor->leaveNode($node, $this->env);
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}
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}
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