1 <?php

     2 

     3 /*

     4  * This file is part of Twig.

     5  *

     6  * (c) 2009 Fabien Potencier

     7  * (c) 2009 Armin Ronacher

     8  *

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

    10  * file that was distributed with this source code.

    11  */

    12 

    13 /**

    14  * Extends a template by another one.

    15  *

    16  * <pre>

    17  *  {% extends "base.html" %}

    18  * </pre>

    19  */

    20 class Twig_TokenParser_Extends extends Twig_TokenParser

    21 {

    22     /**

    23      * Parses a token and returns a node.

    24      *

    25      * @param Twig_Token $token A Twig_Token instance

    26      *

    27      * @return Twig_NodeInterface A Twig_NodeInterface instance

    28      */

    29     public function parse(Twig_Token $token)

    30     {

    31         if (!$this->parser->isMainScope()) {

    32             throw new Twig_Error_Syntax('Cannot extend from a block', $token->getLine());

    33         }

    34 

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

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

    37         }

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

    39 

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

    41 

    42         return null;

    43     }

    44 

    45     /**

    46      * Gets the tag name associated with this token parser.

    47      *

    48      * @param string The tag name

    49      */

    50     public function getTag()

    51     {

    52         return 'extends';

    53     }

    54 }