def toDecimalString()

in rtl/log/luts/FixedPoint.py [0:0]

• 25 lines of code
• 9 McCabe index (conditional complexity)

    def toDecimalString(self, precision=None, round10=False):
        """Convert number (as decimal) into string

        precision -     The maximum number of digits after the decimal point.
        round10 -       Round last decimal digit of fractional part,
                        by adding 0.5/10^precision.
        """
        # Despite rebinding costs, list+join idiom appears slower here
        # than string concatenation building 'rep' from successive digits
        famScale = self.family.scale
        if precision is None or not isinstance(precision, int):
            precision = int((3 + self.family.fraction_bits) / 3.32)
            # Each fractional bit adds about log_10(2) decimal digits

        val = self.scaledval
        rep = ''
        if self.scaledval < 0:
            rep = '-'
            val *= -1

        if round10:
            # Round (decimal) fractional part by adding half of last-digit:
            decimalScale = 10 ** precision
            val = (val * decimalScale + famScale // 2) // decimalScale

        whole = val // famScale
        frac = val - whole * famScale
        rep += str(whole)

        if frac != 0 and precision > 0:
            rep += '.'
            idx = 0
            while idx < precision and frac != 0:
                frac *= 10
                q = frac // famScale
                rep += str(q)
                frac -= q * famScale
                idx += 1
        return rep