public CommandLine parse()

in src/main/java/org/apache/commons/cli/Parser.java [134:214]
54 lines of code
15 McCabe index (conditional complexity)

    public CommandLine parse(final Options options, String[] arguments, final Properties properties, final boolean stopAtNonOption) throws ParseException {
        // clear out the data in options in case it's been used before (CLI-71)
        for (final Option opt : options.helpOptions()) {
            opt.clearValues();
        }

        // clear the data from the groups
        for (final OptionGroup group : options.getOptionGroups()) {
            group.setSelected(null);
        }

        // initialize members
        setOptions(options);

        cmd = new CommandLine();

        boolean eatTheRest = false;

        if (arguments == null) {
            arguments = new String[0];
        }

        final List<String> tokenList = Arrays.asList(flatten(getOptions(), arguments, stopAtNonOption));

        final ListIterator<String> iterator = tokenList.listIterator();

        // process each flattened token
        while (iterator.hasNext()) {
            final String t = iterator.next();

            // the value is the double-dash
            if ("--".equals(t)) {
                eatTheRest = true;
            }

            // the value is a single dash
            else if ("-".equals(t)) {
                if (stopAtNonOption) {
                    eatTheRest = true;
                } else {
                    cmd.addArg(t);
                }
            }

            // the value is an option
            else if (t.startsWith("-")) {
                if (stopAtNonOption && !getOptions().hasOption(t)) {
                    eatTheRest = true;
                    cmd.addArg(t);
                } else {
                    processOption(t, iterator);
                }
            }

            // the value is an argument
            else {
                cmd.addArg(t);

                if (stopAtNonOption) {
                    eatTheRest = true;
                }
            }

            // eat the remaining tokens
            if (eatTheRest) {
                while (iterator.hasNext()) {
                    final String str = iterator.next();

                    // ensure only one double-dash is added
                    if (!"--".equals(str)) {
                        cmd.addArg(str);
                    }
                }
            }
        }

        processProperties(properties);
        checkRequiredOptions();

        return cmd;
    }