name : BaseNodeVisitor.php <?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); }