GroupConcat.php

<?php

/**
 * DoctrineExtensions Mysql Function Pack
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to kontakt@beberlei.de so I can send you a copy immediately.
 */

namespace DoctrineExtensions\Query\Mysql;

use Doctrine\ORM\Query\AST\Functions\FunctionNode,
    Doctrine\ORM\Query\Lexer;

// limited support for GROUP_CONCAT
class GroupConcat extends FunctionNode
{
    public $isDistinct = false;
    public $expression = null;

    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
    {
        return 'GROUP_CONCAT(' .
            ($this->isDistinct ? 'DISTINCT ' : '') .
            $this->expression->dispatch($sqlWalker) .
        ')';
    }

    public function parse(\Doctrine\ORM\Query\Parser $parser)
    {

        $parser->match(Lexer::T_IDENTIFIER);
        $parser->match(Lexer::T_OPEN_PARENTHESIS);
        
        $lexer = $parser->getLexer();
        if ($lexer->isNextToken(Lexer::T_DISTINCT)) {
            $parser->match(Lexer::T_DISTINCT);
            
            $this->isDistinct = true;
        }

        $this->expression = $parser->SingleValuedPathExpression();

        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
    }

}