Arithmetica.MathExpressionTokenizer.ParseNumber C# (CSharp) Метод

        private Token ParseNumber(StringReader reader)
        {
            StringBuilder builder = new StringBuilder();
            while (true)
            {
                char value = (char)reader.Peek();
                if (char.IsDigit(value))
                {
                    reader.Read();
                    builder.Append(value);
                }
                else if (value == '.')
                {
                    reader.Read();
                    builder.Append('.');
                }
                else
                {
                    break;
                }
            }
            double convertedValue = Convert.ToDouble(builder.ToString(), CultureInfo.InvariantCulture);
            return new Token(TokenType.Numeric, convertedValue);
        }