Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
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NodeTraverser.php
01 <?php
02
03 /*
04 * This file is part of Twig.
05 *
06 * (c) 2009 Fabien Potencier
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * 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 }
90