Function GetDomain

library/cpp/string_utils/url/url.cpp:305–317

this strange creature returns 2nd level domain, possibly with port

// this strange creature returns 2nd level domain, possibly with port
TStringBuf GetDomain(const TStringBuf host Y_LIFETIME_BOUND) noexcept {
    const char* c = !host ? host.data() : host.end() - 1;
    for (bool wasPoint = false; c != host.data(); --c) {
        if (*c == '.') {
            if (wasPoint) {
                ++c;
                break;
            }
            wasPoint = true;
        }
    }
    return TStringBuf(c, host.end());
}

TStringBuf GetParentDomain(const TStringBuf host Y_LIFETIME_BOUND, size_t level) noexcept {
    size_t pos = host.size();