private static List parseArgumentsNonWindows()

in com.microsoft.java.debug.core/src/main/java/com/microsoft/java/debug/core/DebugUtility.java [604:674]
63 lines of code
21 McCabe index (conditional complexity)

    private static List<String> parseArgumentsNonWindows(String args) {
        // man sh, see topic QUOTING
        List<String> result = new ArrayList<>();

        final int DEFAULT = 0;
        final int ARG = 1;
        final int IN_DOUBLE_QUOTE = 2;
        final int IN_SINGLE_QUOTE = 3;

        int state = DEFAULT;
        StringBuilder buf = new StringBuilder();
        int len = args.length();
        for (int i = 0; i < len; i++) {
            char ch = args.charAt(i);
            if (Character.isWhitespace(ch)) {
                if (state == DEFAULT) {
                    // skip
                    continue;
                } else if (state == ARG) {
                    state = DEFAULT;
                    result.add(buf.toString());
                    buf.setLength(0);
                    continue;
                }
            }
            switch (state) {
                case DEFAULT:
                case ARG:
                    if (ch == '"') {
                        state = IN_DOUBLE_QUOTE;
                    } else if (ch == '\'') {
                        state = IN_SINGLE_QUOTE;
                    } else if (ch == '\\' && i + 1 < len) {
                        state = ARG;
                        ch = args.charAt(++i);
                        buf.append(ch);
                    } else {
                        state = ARG;
                        buf.append(ch);
                    }
                    break;

                case IN_DOUBLE_QUOTE:
                    if (ch == '"') {
                        state = ARG;
                    } else if (ch == '\\' && i + 1 < len && (args.charAt(i + 1) == '\\' || args.charAt(i + 1) == '"')) {
                        ch = args.charAt(++i);
                        buf.append(ch);
                    } else {
                        buf.append(ch);
                    }
                    break;

                case IN_SINGLE_QUOTE:
                    if (ch == '\'') {
                        state = ARG;
                    } else {
                        buf.append(ch);
                    }
                    break;

                default:
                    throw new IllegalStateException();
            }
        }
        if (buf.length() > 0 || state != DEFAULT) {
            result.add(buf.toString());
        }

        return result;
    }