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NodeVisitorInterface.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\NodeVisitor;
13
14 use Twig\Environment;
15 use Twig\Node\Node;
16
17 /**
18 * Interface for node visitor classes.
19 *
20 * @author Fabien Potencier <fabien@symfony.com>
21 */
22 interface NodeVisitorInterface
23 {
24 /**
25 * Called before child nodes are visited.
26 *
27 * @return Node The modified node
28 */
29 public function enterNode(Node $node, Environment $env);
30
31 /**
32 * Called after child nodes are visited.
33 *
34 * @return Node|null The modified node or null if the node must be removed
35 */
36 public function leaveNode(Node $node, Environment $env);
37
38 /**
39 * Returns the priority for this visitor.
40 *
41 * Priority should be between -10 and 10 (0 is the default).
42 *
43 * @return int The priority level
44 */
45 public function getPriority();
46 }
47
48 class_alias('Twig\NodeVisitor\NodeVisitorInterface', 'Twig_NodeVisitorInterface');
49
50 // Ensure that the aliased name is loaded to keep BC for classes implementing the typehint with the old aliased name.
51 class_exists('Twig\Environment');
52