<?php



namespace DoctrineExtensions\Query\Sqlite;



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

use Doctrine\ORM\Query\Lexer;



/**

 * @author Mikhail Bubnov <bubnov.mihail@gmail.com>

 */

class IfElse extends FunctionNode

{

    private $expr = array();



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

    {

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

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

        $this->expr[] = $parser->ConditionalExpression();



        for ($i = 0; $i < 2; $i++)

        {

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

            $this->expr[] = $parser->ArithmeticExpression();

        }



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

    }



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

    {

        return sprintf('CASE WHEN %s THEN %s ELSE %s END',

            $sqlWalker->walkConditionalExpression($this->expr[0]),

            $sqlWalker->walkArithmeticPrimary($this->expr[1]),

            $sqlWalker->walkArithmeticPrimary($this->expr[2]));

    }

}

