System.Net.Http.Headers.Lexer.IsStarStringValue C# (CSharp) Method

		public bool IsStarStringValue (Token token)
		{
			return (token.EndPosition - token.StartPosition) == 1 && s[token.StartPosition] == '*';
		}

		public static bool TryParse (string input, out ContentRangeHeaderValue parsedValue)
		{
			parsedValue = null;

			var lexer = new Lexer (input);
			var t = lexer.Scan ();
			if (t != Token.Type.Token)
				return false;

			var value = new ContentRangeHeaderValue ();
			value.unit = lexer.GetStringValue (t);

			t = lexer.Scan ();
			if (t != Token.Type.Token)
				return false;

			int nvalue;
			if (!lexer.IsStarStringValue (t)) {
				if (!lexer.TryGetNumericValue (t, out nvalue)) {
					var s = lexer.GetStringValue (t);
					if (s.Length < 3)
						return false;

					var sep = s.Split ('-');
					if (sep.Length != 2)
						return false;

					if (!int.TryParse (sep[0], NumberStyles.None, CultureInfo.InvariantCulture, out nvalue))
						return false;

					value.From = nvalue;

					if (!int.TryParse (sep[1], NumberStyles.None, CultureInfo.InvariantCulture, out nvalue))
						return false;

					value.To = nvalue;
				} else {
					value.From = nvalue;

					t = lexer.Scan (recognizeDash: true);
					if (t != Token.Type.SeparatorDash)
						return false;

					t = lexer.Scan ();

					if (!lexer.TryGetNumericValue (t, out nvalue))
						return false;

					value.To = nvalue;
				}
			}

			t = lexer.Scan ();

			if (t != Token.Type.SeparatorSlash)
				return false;

			t = lexer.Scan ();

			if (!lexer.IsStarStringValue (t)) {
				long lvalue;
				if (!lexer.TryGetNumericValue (t, out lvalue))
					return false;

				value.Length = lvalue;
			}

			t = lexer.Scan ();

			if (t != Token.Type.End)
				return false;

			parsedValue = value;
 
			return true;
		}