io.IoLexer.grabTokenType C# (CSharp) Method

        public IoToken grabTokenType(IoTokenType type)
        {
            int len = grabLength();

            string s1 = s.Substring(lastPos(), len);

            if (len == 0)
            {
                throw new Exception("IoLexer fatal error: empty token\n");
            }

            return addTokenStringType(s1, type);
        }