/*

 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package com.sun.tools.javac.main;

import java.io.IOException;

import java.io.Reader;

import java.io.FileReader;

import java.io.BufferedReader;

import java.io.StreamTokenizer;

import com.sun.tools.javac.util.ListBuffer;

/**

 * Various utility methods for processing Java tool command line arguments.

 *

 *  <p><b>This is NOT part of any supported API.

 *  If you write code that depends on this, you do so at your own risk.

 *  This code and its internal interfaces are subject to change or

 *  deletion without notice.</b>

 */

public class CommandLine {

    /**

     * Process Win32-style command files for the specified command line

     * arguments and return the resulting arguments. A command file argument

     * is of the form '@file' where 'file' is the name of the file whose

     * contents are to be parsed for additional arguments. The contents of

     * the command file are parsed using StreamTokenizer and the original

     * '@file' argument replaced with the resulting tokens. Recursive command

     * files are not supported. The '@' character itself can be quoted with

     * the sequence '@@'.

     */

    public static String[] parse(String[] args)

        throws IOException

    {

        for (String arg : args) {

            if (arg.length() > 1 && arg.charAt(0) == '@') {

                arg = arg.substring(1);

                if (arg.charAt(0) == '@') {

                    newArgs.append(arg);

                } else {

                    loadCmdFile(arg, newArgs);

                }

            } else {

                newArgs.append(arg);

            }

        }

        return newArgs.toList().toArray(new String[newArgs.length()]);

    }

    private static void loadCmdFile(String name, ListBuffer<String> args)

        throws IOException

    {

        try (Reader r = new BufferedReader(new FileReader(name))) {

            StreamTokenizer st = new StreamTokenizer(r);

            st.resetSyntax();

            st.wordChars(' ', 255);

            st.whitespaceChars(0, ' ');

            st.commentChar('#');

            st.quoteChar('"');

            st.quoteChar('\'');

            while (st.nextToken() != StreamTokenizer.TT_EOF) {

                args.append(st.sval);

            }

        }

    }

}