public static ListArgument parse()

in core/src/main/java/org/apache/ftpserver/command/impl/listing/ListArgumentParser.java [41:104]
50 lines of code
15 McCabe index (conditional complexity)

    public static ListArgument parse(String argument) {
        String file = "./";
        String options = "";
        String pattern = "*";

        // find options and file name (may have regular expression)
        if (argument != null) {
            argument = argument.trim();
            StringBuilder optionsSb = new StringBuilder(4);
            StringBuilder fileSb = new StringBuilder(16);
            StringTokenizer st = new StringTokenizer(argument, " ", true);
            while (st.hasMoreTokens()) {
                String token = st.nextToken();

                if (fileSb.length() != 0) {
                    // file name started - append to file name buffer
                    fileSb.append(token);
                } else if (token.equals(" ")) {
                    // delimiter and file not started - ignore
                    continue;
                } else if (token.charAt(0) == '-') {
                    // token and file name not started - append to options
                    // buffer
                    if (token.length() > 1) {
                        optionsSb.append(token.substring(1));
                    }
                } else {
                    // filename - append to the filename buffer
                    fileSb.append(token);
                }
            }

            if (fileSb.length() != 0) {
                file = fileSb.toString();
            }
            options = optionsSb.toString();
        }

        int slashIndex = file.lastIndexOf('/');
        if (slashIndex == -1) {
            if (containsPattern(file)) {
                pattern = file;
                file = "./";
            }
        } else if (slashIndex != (file.length() - 1)) {
            String after = file.substring(slashIndex + 1);

            if (containsPattern(after)) {
                pattern = file.substring(slashIndex + 1);
                file = file.substring(0, slashIndex + 1);
            }

            if (containsPattern(file)) {
                throw new IllegalArgumentException(
                        "Directory path can not contain regular expression");
            }
        }

        if ("*".equals(pattern) || "".equals(pattern)) {
            pattern = null;
        }

        return new ListArgument(file, pattern, options.toCharArray());
    }