1 /*
2  * Copyright (c) 1998, 2014, 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
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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
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19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package sun.tools.util;
27 
28 import java.io.IOException;
29 import java.io.Reader;
30 import java.io.FileReader;
31 import java.io.BufferedReader;
32 import java.io.StreamTokenizer;
33 import java.util.List;
34 import java.util.ArrayList;
35 
36 /**
37  * Various utility methods for processing Java tool command line arguments.
38  *
39  * WARNING: The contents of this source file are not part of any
40  * supported API.  Code that depends on them does so at its own risk:
41  * they are subject to change or removal without notice.
42  */
43 public class CommandLine {
44     /**
45      * Process Win32-style command files for the specified command line
46      * arguments and return the resulting arguments. A command file argument
47      * is of the form '@file' where 'file' is the name of the file whose
48      * contents are to be parsed for additional arguments. The contents of
49      * the command file are parsed using StreamTokenizer and the original
50      * '@file' argument replaced with the resulting tokens. Recursive command
51      * files are not supported. The '@' character itself can be quoted with
52      * the sequence '@@'.
53      */
parse(String[] args)54     public static String[] parse(String[] args)
55         throws IOException
56     {
57         ArrayList<String> newArgs = new ArrayList<>(args.length);
58         for (int i = 0; i < args.length; i++) {
59             String arg = args[i];
60             if (arg.length() > 1 && arg.charAt(0) == '@') {
61                 arg = arg.substring(1);
62                 if (arg.charAt(0) == '@') {
63                     newArgs.add(arg);
64                 } else {
65                     loadCmdFile(arg, newArgs);
66                 }
67             } else {
68                 newArgs.add(arg);
69             }
70         }
71         return newArgs.toArray(new String[newArgs.size()]);
72     }
73 
loadCmdFile(String name, List<String> args)74     private static void loadCmdFile(String name, List<String> args)
75         throws IOException
76     {
77         Reader r = new BufferedReader(new FileReader(name));
78         StreamTokenizer st = new StreamTokenizer(r);
79         st.resetSyntax();
80         st.wordChars(' ', 255);
81         st.whitespaceChars(0, ' ');
82         st.commentChar('#');
83         st.quoteChar('"');
84         st.quoteChar('\'');
85         while (st.nextToken() != StreamTokenizer.TT_EOF) {
86             args.add(st.sval);
87         }
88         r.close();
89     }
90 }
91