doctrine2/lib/Doctrine/ORM/Query/AST/Functions/SqrtFunction.php

<?php
/* 
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 * and open the template in the editor.
 */

namespace Doctrine\ORM\Query\AST\Functions;

/**
 * "SQRT" "(" SimpleArithmeticExpression ")"
 *
 * @author Roman Borschel <roman@code-factory.org>
 */
class SqrtFunction extends FunctionNode
{
    private $_simpleArithmeticExpression;

    public function getSimpleArithmeticExpression()
    {
        return $this->_simpleArithmeticExpression;
    }

    /**
     * @override
     */
    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
    {
        //TODO: Use platform to get SQL
        return 'SQRT(' . $sqlWalker->walkSimpleArithmeticExpression($this->_simpleArithmeticExpression) . ')';
    }

    /**
     * @override
     */
    public function parse(\Doctrine\ORM\Query\Parser $parser)
    {
        $lexer = $parser->getLexer();
        $parser->match($lexer->lookahead['value']);
        $parser->match('(');
        $this->_simpleArithmeticExpression = $parser->SimpleArithmeticExpression();
        $parser->match(')');
    }
}