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NodeTraverser.php
01 <?php
02
03 /*
04 * This file is part of Twig.
05 *
06 * (c) 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 namespace Twig;
13
14 use Twig\Node\Node;
15 use Twig\NodeVisitor\NodeVisitorInterface;
16
17 /**
18 * A node traverser.
19 *
20 * It visits all nodes and their children and calls the given visitor for each.
21 *
22 * @author Fabien Potencier <fabien@symfony.com>
23 */
24 final class NodeTraverser
25 {
26 private $env;
27 private $visitors = [];
28
29 /**
30 * @param NodeVisitorInterface[] $visitors
31 */
32 public function __construct(Environment $env, array $visitors = [])
33 {
34 $this->env = $env;
35 foreach ($visitors as $visitor) {
36 $this->addVisitor($visitor);
37 }
38 }
39
40 public function addVisitor(NodeVisitorInterface $visitor)
41 {
42 $this->visitors[$visitor->getPriority()][] = $visitor;
43 }
44
45 /**
46 * Traverses a node and calls the registered visitors.
47 */
48 public function traverse(Node $node): Node
49 {
50 ksort($this->visitors);
51 foreach ($this->visitors as $visitors) {
52 foreach ($visitors as $visitor) {
53 $node = $this->traverseForVisitor($visitor, $node);
54 }
55 }
56
57 return $node;
58 }
59
60 /**
61 * @return Node|null
62 */
63 private function traverseForVisitor(NodeVisitorInterface $visitor, Node $node)
64 {
65 $node = $visitor->enterNode($node, $this->env);
66
67 foreach ($node as $k => $n) {
68 if (false !== ($m = $this->traverseForVisitor($visitor, $n)) && null !== $m) {
69 if ($m !== $n) {
70 $node->setNode($k, $m);
71 }
72 } else {
73 if (false === $m) {
74 @trigger_error('Returning "false" to remove a Node from NodeVisitorInterface::leaveNode() is deprecated since Twig version 2.9; return "null" instead.', \E_USER_DEPRECATED);
75 }
76
77 $node->removeNode($k);
78 }
79 }
80
81 return $visitor->leaveNode($node, $this->env);
82 }
83 }
84
85 class_alias('Twig\NodeTraverser', 'Twig_NodeTraverser');
86