<?php

/*

 * This file is part of Twig.

 *

 * (c) 2009 Fabien Potencier

 * (c) 2009 Armin Ronacher

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

/**

 * Extends a template by another one.

 *

 * <pre>

 *  {% extends "base.html" %}

 * </pre>

 */

class Twig_TokenParser_Extends extends Twig_TokenParser

{

    /**

     * Parses a token and returns a node.

     *

     * @param Twig_Token $token A Twig_Token instance

     *

     * @return Twig_NodeInterface A Twig_NodeInterface instance

     */

    public function parse(Twig_Token $token)

    {

        if (null !== $this->parser->getParent()) {

            throw new Twig_Error_Syntax('Multiple extends tags are forbidden', $token->getLine());

        }

        $this->parser->setParent($this->parser->getExpressionParser()->parseExpression());

        $this->parser->getStream()->expect(Twig_Token::BLOCK_END_TYPE);

        return null;

    }

    /**

     * Gets the tag name associated with this token parser.

     *

     * @param string The tag name

     */

    public function getTag()

    {

        return 'extends';

    }

}