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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);
}
}