<?php
/**
 * Shopware 5
 * Copyright (c) shopware AG
 *
 * According to our dual licensing model, this program can be used either
 * under the terms of the GNU Affero General Public License, version 3,
 * or under a proprietary license.
 *
 * The texts of the GNU Affero General Public License with an additional
 * permission and of our proprietary license can be found at and
 * in the LICENSE file you have received along with this program.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * "Shopware" is a registered trademark of shopware AG.
 * The licensing of the program under the AGPLv3 does not imply a
 * trademark license. Therefore any rights, title and interest in
 * our trademarks remain entirely with us.
 */
namespace Shopware\Components\Model\Query\Mysql;

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

/**
 * Usage: IFNULL(expr1, expr2)
 *
 * If expr1 is not NULL, IFNULL() returns expr1; otherwise it returns expr2.
 * IFNULL() returns a numeric or string value, depending on the context in
 * which it is used.
 *
 * @category  Shopware
 * @package   Shopware\Components\Model\Query\Mysql
 * @copyright Copyright (c) shopware AG (http://www.shopware.de)
 * @author    Andrew Mackrodt <andrew@ajmm.org>
 * @version   2011.06.12
 */
class IfNull extends FunctionNode
{
    public $expr1;
    public $expr2;

    /**
     * @override
     */
    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
    {
        return 'IFNULL(' .
            $sqlWalker->walkArithmeticPrimary($this->expr1) .
            ', ' .
            $sqlWalker->walkArithmeticPrimary($this->expr2) .
            ')';
    }

    /**
     * @override
     */
    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);
    }
}
