private String toScientificString()

in src/main/java/org/apache/commons/text/numbers/ParsedDecimal.java [710:758]
34 lines of code
7 McCabe index (conditional complexity)

    private String toScientificString(final int decimalPos, final FormatOptions opts) {
        final int targetExponent = digitCount + exponent - decimalPos;
        final int absTargetExponent = Math.abs(targetExponent);
        final boolean includeExponent = shouldIncludeExponent(targetExponent, opts);
        final boolean negativeExponent = targetExponent < 0;

        // determine the size of the full formatted string, including the number of
        // characters needed for the exponent digits
        int size = getDigitStringSize(decimalPos, opts);
        int exponentDigitCount = 0;
        if (includeExponent) {
            exponentDigitCount = absTargetExponent > 0
                    ? (int) Math.floor(Math.log10(absTargetExponent)) + 1
                    : 1;

            size += opts.getExponentSeparatorChars().length + exponentDigitCount;
            if (negativeExponent) {
                ++size;
            }
        }

        prepareOutput(size);

        // append the portion before the exponent field
        final int fractionStartIdx = appendWhole(decimalPos, opts);
        appendFraction(0, fractionStartIdx, opts);

        if (includeExponent) {
            // append the exponent field
            append(opts.getExponentSeparatorChars());

            if (negativeExponent) {
                append(opts.getMinusSign());
            }

            // append the exponent digits themselves; compute the
            // string representation directly and add it to the output
            // buffer to avoid the overhead of Integer.toString()
            final char[] localizedDigits = opts.getDigits();
            int rem = absTargetExponent;
            for (int i = size - 1; i >= outputIdx; --i) {
                outputChars[i] = localizedDigits[rem % DECIMAL_RADIX];
                rem /= DECIMAL_RADIX;
            }
            outputIdx = size;
        }

        return outputString();
    }