Function GetSchemePrefixSize

library/cpp/string_utils/url/url.cpp:134–154

}

size_t GetSchemePrefixSize(const TStringBuf url) noexcept {
    if (url.empty()) {
        return 0;
    }

    struct TDelim: public str_spn {
        inline TDelim()
            : str_spn("!-/:-@[-`{|}", true)
        {
        }
    };

    const auto& delim = *Singleton<TDelim>();
    const char* n = delim.brk(url.data(), url.end());

    if (n + 2 >= url.end() || *n != ':' || n[1] != '/' || n[2] != '/') {
        return 0;
    }

    return n + 3 - url.begin();
}

TStringBuf GetSchemePrefix(const TStringBuf url Y_LIFETIME_BOUND) noexcept {
    return url.Head(GetSchemePrefixSize(url));