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 * Interface for node visitor classes. 19 * 20 * @author Fabien Potencier <fabien@symfony.com> 21 */ 22interface 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 48class_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. 51class_exists('Twig\Environment'); 52