Newtonsoft.Json.JsonTextReader.ReadNumberIntoBuffer C# (CSharp) Method

        private void ReadNumberIntoBuffer()
        {
            int charPos = _charPos;

            while (true)
            {
                switch (_chars[charPos])
                {
                    case '\0':
                        _charPos = charPos;

                        if (_charsUsed == charPos)
                        {
                            if (ReadData(true) == 0)
                            {
                                return;
                            }
                        }
                        else
                        {
                            return;
                        }
                        break;
                    case '-':
                    case '+':
                    case 'a':
                    case 'A':
                    case 'b':
                    case 'B':
                    case 'c':
                    case 'C':
                    case 'd':
                    case 'D':
                    case 'e':
                    case 'E':
                    case 'f':
                    case 'F':
                    case 'x':
                    case 'X':
                    case '.':
                    case '0':
                    case '1':
                    case '2':
                    case '3':
                    case '4':
                    case '5':
                    case '6':
                    case '7':
                    case '8':
                    case '9':
                        charPos++;
                        break;
                    default:
                        _charPos = charPos;

                        char currentChar = _chars[_charPos];
                        if (char.IsWhiteSpace(currentChar) || currentChar == ',' || currentChar == '}' || currentChar == ']' || currentChar == ')' || currentChar == '/')
                        {
                            return;
                        }

                        throw JsonReaderException.Create(this, "Unexpected character encountered while parsing number: {0}.".FormatWith(CultureInfo.InvariantCulture, currentChar));
                }
            }
        }