Beans_Lessc::op_number_number PHP Метод

    protected function op_number_number($op, $left, $right)
    {
        $unit = empty($left[2]) ? $right[2] : $left[2];
        $value = 0;
        switch ($op) {
            case '+':
                $value = $left[1] + $right[1];
                break;
            case '*':
                $value = $left[1] * $right[1];
                break;
            case '-':
                $value = $left[1] - $right[1];
                break;
            case '%':
                $value = $left[1] % $right[1];
                break;
            case '/':
                if ($right[1] == 0) {
                    $this->throwError('parse error: divide by zero');
                }
                $value = $left[1] / $right[1];
                break;
            case '<':
                return $this->toBool($left[1] < $right[1]);
            case '>':
                return $this->toBool($left[1] > $right[1]);
            case '>=':
                return $this->toBool($left[1] >= $right[1]);
            case '=<':
                return $this->toBool($left[1] <= $right[1]);
            default:
                $this->throwError('parse error: unknown number operator: ' . $op);
        }
        return array("number", $value, $unit);
    }