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