1<?php
2
3/*
4 * This file is part of Twig.
5 *
6 * (c) 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
12namespace Twig\NodeVisitor;
13
14use Twig\Environment;
15use Twig\Node\Node;
16
17/**
18 * Used to make node visitors compatible with Twig 1.x and 2.x.
19 *
20 * To be removed in Twig 3.1.
21 *
22 * @author Fabien Potencier <fabien@symfony.com>
23 */
24abstract class AbstractNodeVisitor implements NodeVisitorInterface
25{
26    final public function enterNode(Node $node, Environment $env)
27    {
28        return $this->doEnterNode($node, $env);
29    }
30
31    final public function leaveNode(Node $node, Environment $env)
32    {
33        return $this->doLeaveNode($node, $env);
34    }
35
36    /**
37     * Called before child nodes are visited.
38     *
39     * @return Node The modified node
40     */
41    abstract protected function doEnterNode(Node $node, Environment $env);
42
43    /**
44     * Called after child nodes are visited.
45     *
46     * @return Node|null The modified node or null if the node must be removed
47     */
48    abstract protected function doLeaveNode(Node $node, Environment $env);
49}
50
51class_alias('Twig\NodeVisitor\AbstractNodeVisitor', 'Twig_BaseNodeVisitor');
52