io.IoLexer.readMessage C# (CSharp) Method

        public int readMessage()
        {
            int foundSymbol = 0;
            pushPos();
            readPadding();
            foundSymbol = readSymbol();

            char groupChar;

            while (readSeparator() != 0 || readComment() != 0);

            groupChar = peekChar();

            // this is bug in original IoVM so I've commented this out

            if ("[{".IndexOf(groupChar) != -1 || (foundSymbol == 0 &&
             groupChar == '('))
            {
                string groupName = nameForGroupChar(groupChar);
                addTokenStringType(groupName, IoTokenType.IDENTIFIER_TOKEN);
            }

            if (readTokenCharsType("([{", IoTokenType.OPENPAREN_TOKEN) != 0)
            {
                readPadding();
                do {
                    IoTokenType type = currentToken().type;
                    readPadding();

                    // Empty argument: (... ,)
                    if (IoTokenType.COMMA_TOKEN == type)
                    {
                        char c = current;
                        if (',' == c || ")]}".IndexOf(c) != -1)
                        {
                            readMessageError("missing argument in argument list");
                            return 0;
                        }
                    }

                    if (groupChar == '[') specialChars = "._";
                    messageChain();
                    if (groupChar == '[') specialChars = ":._";
                    readPadding();

                } while (readTokenCharType(',', IoTokenType.COMMA_TOKEN) != 0);

                if (readTokenCharsType(")]}", IoTokenType.CLOSEPAREN_TOKEN) == 0)
                {
                    if (groupChar == '(')
                    {
                        readMessageError("unmatched ()s");
                    }
                    else if (groupChar == '[')
                    {
                        readMessageError("unmatched []s");
                    }
                    else if (groupChar == '{')
                    {
                        readMessageError("unmatched {}s");
                    }
                    return 0;
                }

                popPos();
                return 1;
            }

            if (foundSymbol != 0)
            {
                popPos();
                return 1;
            }

            popPosBack();
            return 0;
        }