public static List csvSplit()

in extensions-support/debezium/runtime/src/main/java/org/apache/camel/quarkus/support/debezium/graal/KafkaConnectSubstitutions.java [109:214]
96 lines of code
25 McCabe index (conditional complexity)

    public static List<String> csvSplit(List<String> list, String s, int off, int len) {
        if (list == null)
            list = new ArrayList<>();
        CsvSplitState state = CsvSplitState.PRE_DATA;
        StringBuilder out = new StringBuilder();
        int last = -1;
        while (len > 0) {
            char ch = s.charAt(off++);
            len--;

            switch (state) {
            case PRE_DATA:
                if (Character.isWhitespace(ch))
                    continue;
                if ('"' == ch) {
                    state = CsvSplitState.QUOTE;
                    continue;
                }

                if (',' == ch) {
                    list.add("");
                    continue;
                }
                state = CsvSplitState.DATA;
                out.append(ch);
                continue;
            case DATA:
                if (Character.isWhitespace(ch)) {
                    last = out.length();
                    out.append(ch);
                    state = CsvSplitState.WHITE;
                    continue;
                }

                if (',' == ch) {
                    list.add(out.toString());
                    out.setLength(0);
                    state = CsvSplitState.PRE_DATA;
                    continue;
                }
                out.append(ch);
                continue;

            case WHITE:
                if (Character.isWhitespace(ch)) {
                    out.append(ch);
                    continue;
                }

                if (',' == ch) {
                    out.setLength(last);
                    list.add(out.toString());
                    out.setLength(0);
                    state = CsvSplitState.PRE_DATA;
                    continue;
                }

                state = CsvSplitState.DATA;
                out.append(ch);
                last = -1;
                continue;
            case QUOTE:
                if ('\\' == ch) {
                    state = CsvSplitState.SLOSH;
                    continue;
                }
                if ('"' == ch) {
                    list.add(out.toString());
                    out.setLength(0);
                    state = CsvSplitState.POST_DATA;
                    continue;
                }
                out.append(ch);
                continue;

            case SLOSH:
                out.append(ch);
                state = CsvSplitState.QUOTE;
                continue;

            case POST_DATA:
                if (',' == ch) {
                    state = CsvSplitState.PRE_DATA;
                    continue;
                }
                continue;
            }
        }
        switch (state) {
        case PRE_DATA:
        case POST_DATA:
            break;
        case DATA:
        case QUOTE:
        case SLOSH:
            list.add(out.toString());
            break;

        case WHITE:
            out.setLength(last);
            list.add(out.toString());
            break;
        }

        return list;
    }