<?php

/*

 * This file is part of Twig.

 *

 * (c) 2009 Fabien Potencier

 *

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

 * file that was distributed with this source code.

 */

/**

 * Defines a variable.

 *

 * <pre>

 *  {% set foo = 'foo' %}

 *

 *  {% set foo = [1, 2] %}

 *

 *  {% set foo = {'foo': 'bar'} %}

 *

 *  {% set foo = 'foo' ~ 'bar' %}

 *

 *  {% set foo, bar = 'foo', 'bar' %}

 *

 *  {% set foo %}Some content{% endset %}

 * </pre>

 */

class Twig_TokenParser_Set 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)

    {

        $lineno = $token->getLine();

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

        $names = $this->parser->getExpressionParser()->parseAssignmentExpression();

        $capture = false;

        if ($stream->test(Twig_Token::OPERATOR_TYPE, '=')) {

            $stream->next();

            $values = $this->parser->getExpressionParser()->parseMultitargetExpression();

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

            if (count($names) !== count($values)) {

                throw new Twig_Error_Syntax("When using set, you must have the same number of variables and assignements.", $lineno);

            }

        } else {

            $capture = true;

            if (count($names) > 1) {

                throw new Twig_Error_Syntax("When using set with a block, you cannot have a multi-target.", $lineno);

            }

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

            $values = $this->parser->subparse(array($this, 'decideBlockEnd'), true);

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

        }

        return new Twig_Node_Set($capture, $names, $values, $lineno, $this->getTag());

    }

    public function decideBlockEnd(Twig_Token $token)

    {

        return $token->test('endset');

    }

    /**

     * Gets the tag name associated with this token parser.

     *

     * @param string The tag name

     */

    public function getTag()

    {

        return 'set';

    }

}