Function ToTitle

util/charset/wide.cpp:239–268

}

bool ToTitle(TUtf16String& text, size_t pos, size_t count) {
    if (!text) {
        return false;
    }

    pos = pos < text.size() ? pos : text.size();
    count = count < text.size() - pos ? count : text.size() - pos;

    const auto toLower = [](const wchar32 s) { return ToLower(s); };

    auto* p = const_cast<wchar16*>(text.data() + pos);
    const auto* pe = text.data() + pos + count;

    const auto firstSymbol = ReadSymbol(p, pe);
    if (firstSymbol == ToTitle(firstSymbol)) {
        p = SkipSymbol(p, pe);
        if (ModifySequence<true>(p, pe, toLower)) {
            DetachAndFixPointers(text, p, pe);
            ModifySequence<false>(p, pe, toLower);
            return true;
        }
    } else {
        DetachAndFixPointers(text, p, pe);
        WriteSymbol(ToTitle(ReadSymbol(p, pe)), p); // also moves `p` forward
        ModifySequence<false>(p, pe, toLower);
        return true;
    }

    return false;
}

bool ToTitle(TUtf32String& text, size_t pos, size_t count) {
    if (!text) {