89 lines
2.3 KiB
PHP
89 lines
2.3 KiB
PHP
<?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 call the given visitor for each.
|
|
*
|
|
* @author Fabien Potencier <fabien@symfony.com>
|
|
*/
|
|
class Twig_NodeTraverser
|
|
{
|
|
protected $env;
|
|
protected $visitors;
|
|
|
|
/**
|
|
* Constructor.
|
|
*
|
|
* @param Twig_Environment $env A Twig_Environment instance
|
|
* @param array $visitors An array of Twig_NodeVisitorInterface instances
|
|
*/
|
|
public function __construct(Twig_Environment $env, array $visitors = array())
|
|
{
|
|
$this->env = $env;
|
|
$this->visitors = array();
|
|
foreach ($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
|
|
*/
|
|
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 null;
|
|
}
|
|
|
|
$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);
|
|
}
|
|
}
|