void Parse()

in src/main/cpp/sdk/common/rapidjson/pointer.h [862:992]
106 lines of code
29 McCabe index (conditional complexity)

    void Parse(const Ch* source, size_t length) {
        RAPIDJSON_ASSERT(source != NULL);
        RAPIDJSON_ASSERT(nameBuffer_ == 0);
        RAPIDJSON_ASSERT(tokens_ == 0);

        // Create own allocator if user did not supply.
        if (!allocator_)
            ownAllocator_ = allocator_ = RAPIDJSON_NEW(Allocator)();

        // Count number of '/' as tokenCount
        tokenCount_ = 0;
        for (const Ch* s = source; s != source + length; s++) 
            if (*s == '/')
                tokenCount_++;

        Token* token = tokens_ = static_cast<Token *>(allocator_->Malloc(tokenCount_ * sizeof(Token) + length * sizeof(Ch)));
        Ch* name = nameBuffer_ = reinterpret_cast<Ch *>(tokens_ + tokenCount_);
        size_t i = 0;

        // Detect if it is a URI fragment
        bool uriFragment = false;
        if (source[i] == '#') {
            uriFragment = true;
            i++;
        }

        if (i != length && source[i] != '/') {
            parseErrorCode_ = kPointerParseErrorTokenMustBeginWithSolidus;
            goto error;
        }

        while (i < length) {
            RAPIDJSON_ASSERT(source[i] == '/');
            i++; // consumes '/'

            token->name = name;
            bool isNumber = true;

            while (i < length && source[i] != '/') {
                Ch c = source[i];
                if (uriFragment) {
                    // Decoding percent-encoding for URI fragment
                    if (c == '%') {
                        PercentDecodeStream is(&source[i], source + length);
                        GenericInsituStringStream<EncodingType> os(name);
                        Ch* begin = os.PutBegin();
                        if (!Transcoder<UTF8<>, EncodingType>().Validate(is, os) || !is.IsValid()) {
                            parseErrorCode_ = kPointerParseErrorInvalidPercentEncoding;
                            goto error;
                        }
                        size_t len = os.PutEnd(begin);
                        i += is.Tell() - 1;
                        if (len == 1)
                            c = *name;
                        else {
                            name += len;
                            isNumber = false;
                            i++;
                            continue;
                        }
                    }
                    else if (NeedPercentEncode(c)) {
                        parseErrorCode_ = kPointerParseErrorCharacterMustPercentEncode;
                        goto error;
                    }
                }

                i++;
                
                // Escaping "~0" -> '~', "~1" -> '/'
                if (c == '~') {
                    if (i < length) {
                        c = source[i];
                        if (c == '0')       c = '~';
                        else if (c == '1')  c = '/';
                        else {
                            parseErrorCode_ = kPointerParseErrorInvalidEscape;
                            goto error;
                        }
                        i++;
                    }
                    else {
                        parseErrorCode_ = kPointerParseErrorInvalidEscape;
                        goto error;
                    }
                }

                // First check for index: all of characters are digit
                if (c < '0' || c > '9')
                    isNumber = false;

                *name++ = c;
            }
            token->length = static_cast<SizeType>(name - token->name);
            if (token->length == 0)
                isNumber = false;
            *name++ = '\0'; // Null terminator

            // Second check for index: more than one digit cannot have leading zero
            if (isNumber && token->length > 1 && token->name[0] == '0')
                isNumber = false;

            // String to SizeType conversion
            SizeType n = 0;
            if (isNumber) {
                for (size_t j = 0; j < token->length; j++) {
                    SizeType m = n * 10 + static_cast<SizeType>(token->name[j] - '0');
                    if (m < n) {   // overflow detection
                        isNumber = false;
                        break;
                    }
                    n = m;
                }
            }

            token->index = isNumber ? n : kPointerInvalidIndex;
            token++;
        }

        RAPIDJSON_ASSERT(name <= nameBuffer_ + length); // Should not overflow buffer
        parseErrorCode_ = kPointerParseErrorNone;
        return;

    error:
        Allocator::Free(tokens_);
        nameBuffer_ = 0;
        tokens_ = 0;
        tokenCount_ = 0;
        parseErrorOffset_ = i;
        return;
    }