|
1
|
<?php
|
|
2
|
|
|
3
|
/*
|
|
4
|
* This file is part of Twig.
|
|
5
|
*
|
|
6
|
* (c) 2009 Fabien Potencier
|
|
7
|
*
|
|
8
|
* For the full copyright and license information, please view the LICENSE
|
|
9
|
* file that was distributed with this source code.
|
|
10
|
*/
|
|
11
|
|
|
12
|
/**
|
|
13
|
* Twig_NodeTraverser is a node traverser.
|
|
14
|
*
|
|
15
|
* It visits all nodes and their children and calls the given visitor for each.
|
|
16
|
*
|
|
17
|
* @author Fabien Potencier <fabien@symfony.com>
|
|
18
|
*/
|
|
19
|
class Twig_NodeTraverser
|
|
20
|
{
|
|
21
|
protected $env;
|
|
22
|
protected $visitors = array();
|
|
23
|
|
|
24
|
/**
|
|
25
|
* Constructor.
|
|
26
|
*
|
|
27
|
* @param Twig_Environment $env A Twig_Environment instance
|
|
28
|
* @param Twig_NodeVisitorInterface[] $visitors An array of Twig_NodeVisitorInterface instances
|
|
29
|
*/
|
|
30
|
public function __construct(Twig_Environment $env, array $visitors = array())
|
|
31
|
{
|
|
32
|
$this->env = $env;
|
|
33
|
foreach ($visitors as $visitor) {
|
|
34
|
$this->addVisitor($visitor);
|
|
35
|
}
|
|
36
|
}
|
|
37
|
|
|
38
|
/**
|
|
39
|
* Adds a visitor.
|
|
40
|
*
|
|
41
|
* @param Twig_NodeVisitorInterface $visitor A Twig_NodeVisitorInterface instance
|
|
42
|
*/
|
|
43
|
public function addVisitor(Twig_NodeVisitorInterface $visitor)
|
|
44
|
{
|
|
45
|
if (!isset($this->visitors[$visitor->getPriority()])) {
|
|
46
|
$this->visitors[$visitor->getPriority()] = array();
|
|
47
|
}
|
|
48
|
|
|
49
|
$this->visitors[$visitor->getPriority()][] = $visitor;
|
|
50
|
}
|
|
51
|
|
|
52
|
/**
|
|
53
|
* Traverses a node and calls the registered visitors.
|
|
54
|
*
|
|
55
|
* @param Twig_NodeInterface $node A Twig_NodeInterface instance
|
|
56
|
*
|
|
57
|
* @return Twig_NodeInterface
|
|
58
|
*/
|
|
59
|
public function traverse(Twig_NodeInterface $node)
|
|
60
|
{
|
|
61
|
ksort($this->visitors);
|
|
62
|
foreach ($this->visitors as $visitors) {
|
|
63
|
foreach ($visitors as $visitor) {
|
|
64
|
$node = $this->traverseForVisitor($visitor, $node);
|
|
65
|
}
|
|
66
|
}
|
|
67
|
|
|
68
|
return $node;
|
|
69
|
}
|
|
70
|
|
|
71
|
protected function traverseForVisitor(Twig_NodeVisitorInterface $visitor, Twig_NodeInterface $node = null)
|
|
72
|
{
|
|
73
|
if (null === $node) {
|
|
74
|
return;
|
|
75
|
}
|
|
76
|
|
|
77
|
$node = $visitor->enterNode($node, $this->env);
|
|
78
|
|
|
79
|
foreach ($node as $k => $n) {
|
|
80
|
if (false !== $n = $this->traverseForVisitor($visitor, $n)) {
|
|
81
|
$node->setNode($k, $n);
|
|
82
|
} else {
|
|
83
|
$node->removeNode($k);
|
|
84
|
}
|
|
85
|
}
|
|
86
|
|
|
87
|
return $visitor->leaveNode($node, $this->env);
|
|
88
|
}
|
|
89
|
}
|