1
0
mirror of https://github.com/vichan-devel/vichan.git synced 2024-12-21 11:56:04 +01:00
vichan/inc/lib/Twig/NodeTraverser.php

89 lines
2.3 KiB
PHP
Raw Normal View History

2011-10-05 06:22:53 +02:00
<?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.
*
2013-08-01 21:20:12 +02:00
* @author Fabien Potencier <fabien@symfony.com>
2011-10-05 06:22:53 +02:00
*/
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);
}
}