Function reduceLengthOfFloatString

JUCE/modules/juce_core/text/juce_String.cpp:2199–2268

//==============================================================================

static String reduceLengthOfFloatString (const String& input)
{
    const auto start = input.getCharPointer();
    const auto end = start + (int) input.length();
    auto trimStart = end;
    auto trimEnd = trimStart;
    auto exponentTrimStart = end;
    auto exponentTrimEnd = exponentTrimStart;

    decltype (*start) currentChar = '\0';

    for (auto c = end - 1; c > start; --c)
    {
        currentChar = *c;

        if (currentChar == '0' && c + 1 == trimStart)
        {
            --trimStart;
        }
        else if (currentChar == '.')
        {
            if (trimStart == c + 1 && trimStart != end && *trimStart == '0')
                ++trimStart;

            break;
        }
        else if (currentChar == 'e' || currentChar == 'E')
        {
            auto cNext = c + 1;

            if (cNext != end)
            {
                if (*cNext == '-')
                    ++cNext;

                exponentTrimStart = cNext;

                if (cNext != end && *cNext == '+')
                    ++cNext;

                exponentTrimEnd = cNext;
            }

            while (cNext != end && *cNext++ == '0')
                exponentTrimEnd = cNext;

            if (exponentTrimEnd == end)
                exponentTrimStart = c;

            trimStart = c;
            trimEnd = trimStart;
        }
    }

    if ((trimStart != trimEnd && currentChar == '.') || exponentTrimStart != exponentTrimEnd)
    {
        if (trimStart == trimEnd)
            return String (start, exponentTrimStart) + String (exponentTrimEnd, end);