1 /*
   2  * Copyright (c) 2004, 2010, 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 
  26 package com.sun.tools.apt.main;
  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 com.sun.tools.javac.util.ListBuffer;
  34 
  35 /**
  36  * Various utility methods for processing Java tool command line arguments.
  37  *
  38  *  <p><b>This is NOT part of any supported API.
  39  *  If you write code that depends on this, you do so at your own risk.
  40  *  This code and its internal interfaces are subject to change or
  41  *  deletion without notice.</b>
  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      */
  54     public static String[] parse(String[] args)
  55         throws IOException
  56     {
  57         ListBuffer<String> newArgs = new ListBuffer<String>();
  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.append(arg);
  64                 } else {
  65                     loadCmdFile(arg, newArgs);
  66                 }
  67             } else {
  68                 newArgs.append(arg);
  69             }
  70         }
  71         return newArgs.toList().toArray(new String[newArgs.length()]);
  72     }
  73 
  74     private static void loadCmdFile(String name, ListBuffer<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.append(st.sval);
  87         }
  88         r.close();
  89     }
  90 }