<?php



namespace DoctrineExtensions\Query\Mysql;



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

    Doctrine\ORM\Query\Lexer;



/**

 * @author Andrew Mackrodt <andrew@ajmm.org>

 */

class IfNull extends FunctionNode

{

    private $expr1;

    private $expr2;



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

    {

        $parser->match(Lexer::T_IDENTIFIER);

        $parser->match(Lexer::T_OPEN_PARENTHESIS);

        $this->expr1 = $parser->ArithmeticExpression();

        $parser->match(Lexer::T_COMMA);

        $this->expr2 = $parser->ArithmeticExpression();

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

    }



    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)

    {

        return 'IFNULL('

            .$sqlWalker->walkArithmeticPrimary($this->expr1). ', '

            .$sqlWalker->walkArithmeticPrimary($this->expr2).')';

    }

}

