<?php

/*

 * This file is part of Twig.

 *

 * (c) 2011 Fabien Potencier

 *

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

 * file that was distributed with this source code.

 */

/**

 * Imports blocks defined in another template into the current template.

 *

 * <pre>

 * {% extends "base.html" %}

 *

 * {% use "blocks.html" %}

 *

 * {% block title %}{% endblock %}

 * {% block content %}{% endblock %}

 * </pre>

 *

 * @see http://www.twig-project.org/doc/templates.html#horizontal-reuse for details.

 */

class Twig_TokenParser_Use 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)

    {

        $template = $this->parser->getExpressionParser()->parseExpression();

        if (!$template instanceof Twig_Node_Expression_Constant) {

            throw new Twig_Error_Syntax('The template references in a "use" statement must be a string.', $token->getLine());

        }

        $stream = $this->parser->getStream();

        $targets = array();

        if ($stream->test('with')) {

            $stream->next();

            do {

                $name = $stream->expect(Twig_Token::NAME_TYPE)->getValue();

                $alias = $name;

                if ($stream->test('as')) {

                    $stream->next();

                    $alias = $stream->expect(Twig_Token::NAME_TYPE)->getValue();

                }

                $targets[$name] = new Twig_Node_Expression_Constant($alias, -1);

                if (!$stream->test(Twig_Token::PUNCTUATION_TYPE, ',')) {

                    break;

                }

                $stream->next();

            } while (true);

        }

        $stream->expect(Twig_Token::BLOCK_END_TYPE);

        $this->parser->addTrait(new Twig_Node(array('template' => $template, 'targets' => new Twig_Node($targets))));

        return null;

    }

    /**

     * Gets the tag name associated with this token parser.

     *

     * @param string The tag name

     */

    public function getTag()

    {

        return 'use';

    }

}