static string ParseString()

in Source/Assets/AppCenterEditorExtensions/Editor/Scripts/AppCenterEditorSDK/SimpleJson.cs [794:886]
85 lines of code
26 McCabe index (conditional complexity)

        static string ParseString(char[] json, ref int index, ref bool success)
        {
            if (_parseStringBuilder == null)
                _parseStringBuilder = new StringBuilder(BUILDER_INIT);
            _parseStringBuilder.Length = 0;

            EatWhitespace(json, ref index);

            // "
            char c = json[index++];
            bool complete = false;
            while (!complete)
            {
                if (index == json.Length)
                    break;

                c = json[index++];
                if (c == '"')
                {
                    complete = true;
                    break;
                }
                else if (c == '\\')
                {
                    if (index == json.Length)
                        break;
                    c = json[index++];
                    if (c == '"')
                        _parseStringBuilder.Append('"');
                    else if (c == '\\')
                        _parseStringBuilder.Append('\\');
                    else if (c == '/')
                        _parseStringBuilder.Append('/');
                    else if (c == 'b')
                        _parseStringBuilder.Append('\b');
                    else if (c == 'f')
                        _parseStringBuilder.Append('\f');
                    else if (c == 'n')
                        _parseStringBuilder.Append('\n');
                    else if (c == 'r')
                        _parseStringBuilder.Append('\r');
                    else if (c == 't')
                        _parseStringBuilder.Append('\t');
                    else if (c == 'u')
                    {
                        int remainingLength = json.Length - index;
                        if (remainingLength >= 4)
                        {
                            // parse the 32 bit hex into an integer codepoint
                            uint codePoint;
                            if (!(success = UInt32.TryParse(new string(json, index, 4), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out codePoint)))
                                return "";

                            // convert the integer codepoint to a unicode char and add to string
                            if (0xD800 <= codePoint && codePoint <= 0xDBFF)  // if high surrogate
                            {
                                index += 4; // skip 4 chars
                                remainingLength = json.Length - index;
                                if (remainingLength >= 6)
                                {
                                    uint lowCodePoint;
                                    if (new string(json, index, 2) == "\\u" && UInt32.TryParse(new string(json, index + 2, 4), NumberStyles.HexNumber, CultureInfo.InvariantCulture, out lowCodePoint))
                                    {
                                        if (0xDC00 <= lowCodePoint && lowCodePoint <= 0xDFFF)    // if low surrogate
                                        {
                                            _parseStringBuilder.Append((char)codePoint);
                                            _parseStringBuilder.Append((char)lowCodePoint);
                                            index += 6; // skip 6 chars
                                            continue;
                                        }
                                    }
                                }
                                success = false;    // invalid surrogate pair
                                return "";
                            }
                            _parseStringBuilder.Append(ConvertFromUtf32((int)codePoint));
                            // skip 4 chars
                            index += 4;
                        }
                        else
                            break;
                    }
                }
                else
                    _parseStringBuilder.Append(c);
            }
            if (!complete)
            {
                success = false;
                return null;
            }
            return _parseStringBuilder.ToString();
        }