1/*
2 * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.tools.jar;
27
28import java.io.IOException;
29import java.io.Reader;
30import java.io.FileReader;
31import java.io.BufferedReader;
32import java.io.StreamTokenizer;
33import java.util.List;
34import java.util.ArrayList;
35
36/**
37 * Various utility methods for processing Java tool command line arguments.
38 *
39 *  <p><b>This is NOT part of any API supported by Oracle.  If
40 *  you write code that depends on this, you do so at your own risk.
41 *  This code and its internal interfaces are subject to change or
42 *  deletion without notice.</b>
43 */
44public class CommandLine {
45    /**
46     * Process Win32-style command files for the specified command line
47     * arguments and return the resulting arguments. A command file argument
48     * is of the form '@file' where 'file' is the name of the file whose
49     * contents are to be parsed for additional arguments. The contents of
50     * the command file are parsed using StreamTokenizer and the original
51     * '@file' argument replaced with the resulting tokens. Recursive command
52     * files are not supported. The '@' character itself can be quoted with
53     * the sequence '@@'.
54     */
55    public static String[] parse(String[] args)
56        throws IOException
57    {
58        List<String> newArgs = new ArrayList<>(args.length);
59        for (int i = 0; i < args.length; i++) {
60            String arg = args[i];
61            if (arg.length() > 1 && arg.charAt(0) == '@') {
62                arg = arg.substring(1);
63                if (arg.charAt(0) == '@') {
64                    newArgs.add(arg);
65                } else {
66                    loadCmdFile(arg, newArgs);
67                }
68            } else {
69                newArgs.add(arg);
70            }
71        }
72        return newArgs.toArray(new String[newArgs.size()]);
73    }
74
75    private static void loadCmdFile(String name, List<String> args)
76        throws IOException
77    {
78        Reader r = new BufferedReader(new FileReader(name));
79        StreamTokenizer st = new StreamTokenizer(r);
80        st.resetSyntax();
81        st.wordChars(' ', 255);
82        st.whitespaceChars(0, ' ');
83        st.commentChar('#');
84        st.quoteChar('"');
85        st.quoteChar('\'');
86        while (st.nextToken() != StreamTokenizer.TT_EOF) {
87            args.add(st.sval);
88        }
89        r.close();
90    }
91}
92