XSharp.CodeDom.XSharpCodeGenerator.GetBaseTypeOutput C# (CSharp) Method

        private string GetBaseTypeOutput(CodeTypeReference typeRef)
        {
            string baseType = typeRef.BaseType;

            if (baseType.Length == 0)
            {
                return "VOID";
            }
            switch (baseType.ToLower(CultureInfo.InvariantCulture))
            {
                case "system.int16":
                    return "SHORT";

                case "system.uint16":
                    return "WORD";

                case "system.int32":
                    return "INT";

                case "system.uint32":
                    return "DWORD";

                case "system.int64":
                    return "INT64";

                case "system.uint64":
                    return "UINT64";

                case "system.string":
                    return "STRING";

                case "system.char":
                    return "CHAR";

                case "system.object":
                    return "OBJECT";

                case "system.boolean":
                    return "LOGIC";

                case "system.void":
                    return "VOID";

                case "system.byte":
                    return "BYTE";

                case "system.sbyte":
                    return "System.SByte";

                case "system.single":
                    return "REAL4";

                case "system.double":
                    return "REAL8";

                case "system.decimal":
                    return "System.Decimal";
            }
            // 
            StringBuilder sb = new StringBuilder(baseType.Length + 10);
            string str3 = typeRef.BaseType;
            int startIndex = 0;
            int start = 0;

            for (int i = 0; i < str3.Length; i++)
            {
                switch (str3[i])
                {
                    case '+':
                    case '.':
                        sb.Append(str3.Substring(startIndex, i - startIndex));
                        sb.Append('.');
                        i++;
                        startIndex = i;
                        break;

                    case '`':
                        {
                            sb.Append(str3.Substring(startIndex, i - startIndex));
                            i++;
                            int length = 0;
                            while (((i < str3.Length) && (str3[i] >= '0')) && (str3[i] <= '9'))
                            {
                                length = (length * 10) + (str3[i] - '0');
                                i++;
                            }
                            // Generic Type like System.Int`ValueType : so, ignore  ValueType
                            if (length > 0)
                            {
                                sb.Append(this.BuildGenericArguments(typeRef.TypeArguments, start, length));
                                start += length;
                                if ((i < str3.Length) && ((str3[i] == '+') || (str3[i] == '.')))
                                {
                                    sb.Append('.');
                                    i++;
                                }
                                startIndex = i;
                            }
                            else
                                startIndex = str3.Length;
                            break;
                        }
                }
            }
            if (startIndex < str3.Length)
            {
                sb.Append(str3.Substring(startIndex));
            }
            return sb.ToString();
        }