static bool Decode()

in rapidjson/encodings.h [146:176]

• 30 lines of code
• 10 McCabe index (conditional complexity)

    static bool Decode(InputStream& is, unsigned* codepoint) {
#define COPY() c = is.Take(); *codepoint = (*codepoint << 6) | (static_cast<unsigned char>(c) & 0x3Fu)
#define TRANS(mask) result &= ((GetRange(static_cast<unsigned char>(c)) & mask) != 0)
#define TAIL() COPY(); TRANS(0x70)
        typename InputStream::Ch c = is.Take();
        if (!(c & 0x80)) {
            *codepoint = static_cast<unsigned char>(c);
            return true;
        }

        unsigned char type = GetRange(static_cast<unsigned char>(c));
        if (type >= 32) {
            *codepoint = 0;
        } else {
            *codepoint = (0xFF >> type) & static_cast<unsigned char>(c);
        }
        bool result = true;
        switch (type) {
        case 2: TAIL(); return result;
        case 3: TAIL(); TAIL(); return result;
        case 4: COPY(); TRANS(0x50); TAIL(); return result;
        case 5: COPY(); TRANS(0x10); TAIL(); TAIL(); return result;
        case 6: TAIL(); TAIL(); TAIL(); return result;
        case 10: COPY(); TRANS(0x20); TAIL(); return result;
        case 11: COPY(); TRANS(0x60); TAIL(); TAIL(); return result;
        default: return false;
        }
#undef COPY
#undef TRANS
#undef TAIL
    }