BaseNodeVisitor.php

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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.
 */

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);
    }

    abstract protected function doEnterNode(Twig_Node $node, Twig_Environment $env);

    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');