Method ReadHexDigit

library/cpp/regex/pire/pire/read_unicode.cpp:55–67

    }

    ystring UnicodeReader::ReadHexDigit(std::function<bool(wchar32, size_t)> shouldStop) {
        ystring result;
        wchar32 ch = GetChar();
        while (!shouldStop(ch, result.size())) {
            if (!IsHexDigit(ch)) {
                Error("Pire::UnicodeReader::ReadHexDigit(): \"\\x...\" sequence contains non-valid hex number");
            }
            result.push_back(ch);
            ch = GetChar();
        }
        UngetChar(ch);
        return result;
    }

    wchar32 UnicodeReader::HexToDec(const ystring &hexStr) {
        wchar32 converted;