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/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.alibaba.antx.util.cli;

import java.util.ArrayList;

/**
 * The class GnuParser provides an implementation of the
 * {@link Parser#flatten(Options, String[], boolean) flatten} method.
 *
 * @author John Keyes (john at integralsource.com)
 * @see Parser
 */
public class GnuParser extends Parser {
    /** holder for flattened tokens */
    private ArrayList tokens = new ArrayList();

    /**
     * 
     * Resets the members to their original state i.e. remove all of
     * tokens entries.
     * 
     */
    private void init() {
        tokens.clear();
    }

    /**
     * 
     * This flatten method does so using the following rules:
     * 

     * If an {@link Option} exists for the first character of the
     * arguments entry AND an {@link Option} does not exist
     * for the whole argument then add the first character as an
     * option to the processed tokens list e.g. "-D" and add the rest of the
     * entry to the also.
     * Otherwise just add the token to the processed tokens list.
     * 
     * 
     */
    @Override
    protected String[] flatten(Options options, String[] arguments, boolean stopAtNonOption) {
        init();

        boolean eatTheRest = false;
        Option currentOption = null;

        for (int i = 0; i < arguments.length; i++) {
            if ("--".equals(arguments[i])) {
                eatTheRest = true;
                tokens.add("--");
            } else if ("-".equals(arguments[i])) {
                tokens.add("-");
            } else if (arguments[i].startsWith("-")) {
                Option option = options.getOption(arguments[i]);

                // this is not an Option
                if (option == null) {
                    // handle special properties Option
                    Option specialOption = options.getOption(arguments[i].substring(0, 2));

                    if (specialOption != null) {
                        tokens.add(arguments[i].substring(0, 2));
                        tokens.add(arguments[i].substring(2));
                    } else if (stopAtNonOption) {
                        eatTheRest = true;
                        tokens.add(arguments[i]);
                    } else {
                        tokens.add(arguments[i]);
                    }
                } else {
                    currentOption = option;

                    // special option
                    Option specialOption = options.getOption(arguments[i].substring(0, 2));

                    if (specialOption != null && option == null) {
                        tokens.add(arguments[i].substring(0, 2));
                        tokens.add(arguments[i].substring(2));
                    } else if (currentOption != null && currentOption.hasArg()) {
                        if (currentOption.hasArg()) {
                            tokens.add(arguments[i]);
                            currentOption = null;
                        } else if (currentOption.hasArgs()) {
                            tokens.add(arguments[i]);
                        } else if (stopAtNonOption) {
                            eatTheRest = true;
                            tokens.add("--");
                            tokens.add(arguments[i]);
                        } else {
                            tokens.add(arguments[i]);
                        }
                    } else if (currentOption != null) {
                        tokens.add(arguments[i]);
                    } else if (stopAtNonOption) {
                        eatTheRest = true;
                        tokens.add("--");
                        tokens.add(arguments[i]);
                    } else {
                        tokens.add(arguments[i]);
                    }
                }
            } else {
                tokens.add(arguments[i]);
            }

            if (eatTheRest) {
                for (i++; i < arguments.length; i++) {
                    tokens.add(arguments[i]);
                }
            }
        }

        return (String[]) tokens.toArray(new String[] { });
    }
}