<?php
/**
*
* @package phpBB3
* @copyright (c) 2013 phpBB Group, sections (c) 2009 Fabien Potencier
* @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License v2
*
*/

class phpbb_template_twig_tokenparser_if extends Twig_TokenParser_If
{
    /**
     * 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();
        $expr = $this->parser->getExpressionParser()->parseExpression();
        $stream = $this->parser->getStream();
        $stream->expect(Twig_Token::BLOCK_END_TYPE);
        $body = $this->parser->subparse(array($this, 'decideIfFork'));
        $tests = array($expr, $body);
        $else = null;

        $end = false;
        while (!$end) {
            switch ($stream->next()->getValue()) {
                case 'ELSE':
                    $stream->expect(Twig_Token::BLOCK_END_TYPE);
                    $else = $this->parser->subparse(array($this, 'decideIfEnd'));
                    break;

                case 'ELSEIF':
                    $expr = $this->parser->getExpressionParser()->parseExpression();
                    $stream->expect(Twig_Token::BLOCK_END_TYPE);
                    $body = $this->parser->subparse(array($this, 'decideIfFork'));
                    $tests[] = $expr;
                    $tests[] = $body;
                    break;

                case 'ENDIF':
                    $end = true;
                    break;

                default:
                    throw new Twig_Error_Syntax(sprintf('Unexpected end of template. Twig was looking for the following tags "ELSE", "ELSEIF", or "ENDIF" to close the "IF" block started at line %d)', $lineno), $stream->getCurrent()->getLine(), $stream->getFilename());
            }
        }

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

        return new Twig_Node_If(new Twig_Node($tests), $else, $lineno, $this->getTag());
    }

    public function decideIfFork(Twig_Token $token)
    {
        return $token->test(array('ELSEIF', 'ELSE', 'ENDIF'));
    }

    public function decideIfEnd(Twig_Token $token)
    {
        return $token->test(array('ENDIF'));
    }

    /**
     * Gets the tag name associated with this token parser.
     *
     * @return string The tag name
     */
    public function getTag()
    {
        return 'IF';
    }
}