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54 lines
1.6 KiB
54 lines
1.6 KiB
<?php
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/*
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* This file is part of Twig.
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*
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* (c) Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Twig_BaseNodeVisitor can be used to make node visitors compatible with Twig 1.x and 2.x.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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abstract class Twig_BaseNodeVisitor implements Twig_NodeVisitorInterface
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{
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final public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
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{
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if (!$node instanceof Twig_Node) {
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throw new LogicException('Twig_BaseNodeVisitor only supports Twig_Node instances.');
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}
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return $this->doEnterNode($node, $env);
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}
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final public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
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{
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if (!$node instanceof Twig_Node) {
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throw new LogicException('Twig_BaseNodeVisitor only supports Twig_Node instances.');
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}
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return $this->doLeaveNode($node, $env);
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}
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/**
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* Called before child nodes are visited.
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*
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* @return Twig_Node The modified node
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*/
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abstract protected function doEnterNode(Twig_Node $node, Twig_Environment $env);
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/**
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* Called after child nodes are visited.
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*
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* @return Twig_Node|false The modified node or false if the node must be removed
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*/
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abstract protected function doLeaveNode(Twig_Node $node, Twig_Environment $env);
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}
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class_alias('Twig_BaseNodeVisitor', 'Twig\NodeVisitor\AbstractNodeVisitor', false);
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class_exists('Twig_Environment');
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class_exists('Twig_Node');
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