private Type next()

in src/com/amazon/ion/impl/IonTokenReader.java [470:575]
104 lines of code
39 McCabe index (conditional complexity)

    private Type next(int c, boolean is_in_expression) throws IOException {
        int c2;
        t = Type.none;

        isIncomplete = false;
        switch (c) {
        case -1:
            return (t = Type.eof);
        case '{':
            c2 = read();
            if (c2 == '{') {
                return (t = Type.tOpenDoubleCurly);
            }
            unread(c2);
            return (t = Type.tOpenCurly);
        case '}':
            return (t = Type.tCloseCurly);
        case '[':
            return (t = Type.tOpenSquare);
        case ']':
            return (t = Type.tCloseSquare);
        case '(':
            return (t = Type.tOpenParen);
        case ')':
            return (t = Type.tCloseParen);
        case ',':
            return (t = Type.tComma);
        case '0': case '1': case '2': case '3': case '4':
        case '5': case '6': case '7': case '8': case '9':
            return readNumber(c);
        case '\"':
            inQuotedContent = true;
            this.keyword = Type.none; // anything in quotes isn't a keyword
            return scanString(c, _Private_IonConstants.lnIsVarLen - 1);
        case '\'':
            c2 = read();
            if (c2 == '\'') {
                c2 = read();
                if (c2 == '\'') {
                    return scanLongString();
                }
                this.unread(c2);
                c2 = '\''; // restore c2 for the next unread
            }
            this.unread(c2);
            inQuotedContent = true;
            return scanIdentifier(c);
        case '+':
            c2 = read();
            if (c2 == 'i') {
                c2 = read();
                if (c2 == 'n') {
                    c2 = read();
                    if (c2 == 'f') {
                        return (t = Type.kwPosInf);
                    }
                    this.unread(c2);
                    c2 = 'n';
                }
                this.unread(c2);
                c2 = 'i';
            }
            this.unread(c2);
            if (is_in_expression) {
                return scanOperator(c);
            }
            break; // break to error
        case '-':
            c2 = read();
            if (c2 >= '0' && c2 <= '9') {
                this.unread(c2);
                return readNumber(c);
            }
            if (c2 == 'i') {
                c2 = read();
                if (c2 == 'n') {
                    c2 = read();
                    if (c2 == 'f') {
                        return (t = Type.kwNegInf);
                    }
                    this.unread(c2);
                    c2 = 'n';
                }
                this.unread(c2);
                c2 = 'i';
            }
            this.unread(c2);
            if (is_in_expression) {
                return scanOperator(c);
            }
            break; // break to error
        default:
            if (IonTextUtils.isIdentifierStart(c)) {
                return scanIdentifier(c);
            }
            if (is_in_expression && isOperatorPart(c)) {
                return scanOperator(c);
            }
        }

        String message =
            "Unexpected character " + printCodePointAsString(c) +
            " encountered at line " + this.getLineNumber() +
            " column " + this.getColumn();
        throw new IonException(message);
    }