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