<?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.
*/
namespace Twig\NodeVisitor;
use Twig\Environment;
use Twig\Node\Node;
/**
* Used to make node visitors compatible with Twig 1.x and 2.x.
*
* To be removed in Twig 3.1.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
abstract class AbstractNodeVisitor implements NodeVisitorInterface
{
final public function enterNode(Node $node, Environment $env): Node
{
return $this->doEnterNode($node, $env);
}
final public function leaveNode(Node $node, Environment $env): ?Node
{
return $this->doLeaveNode($node, $env);
}
/**
* Called before child nodes are visited.
*
* @return Node The modified node
*/
abstract protected function doEnterNode(Node $node, Environment $env);
/**
* Called after child nodes are visited.
*
* @return Node|null The modified node or null if the node must be removed
*/
abstract protected function doLeaveNode(Node $node, Environment $env);
}