/*
* @(#)CommandLine.java 1.18 07/03/21
*
* Copyright (c) 2007 Sun Microsystems, Inc. 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. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.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;
import com.sun.tools.javac.util.Version;
/**
* Various utility methods for processing Java tool command line arguments.
*
* <p><b>This is NOT part of any API supported by Sun Microsystems. 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>
*/
@Version("@(#)CommandLine.java 1.18 07/03/21")
public class CommandLine {
private static my.Debug DEBUG=new my.Debug(my.Debug.Main);//我加上的
/**
* 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
{
try {//我加上的
DEBUG.P(CommandLine.class,"parse(1)");
ListBuffer<String> newArgs = new ListBuffer<String>();
for (int i = 0; i < args.length; i++) {
String arg = args[i];
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()]);
}finally{//我加上的
DEBUG.P(0,CommandLine.class,"parse(1)");
}
}
//StreamTokenizer类不够完善，从StreamTokenizer类的nextToken()方法
//返回的token如果不进行适当判断，很容易在后面的其他代码中产生Bug，
//比如:如果返回的token是一个空串，
//在com.sun.tools.javac.main.Main.processArgs方法中
//flag的长度就等于0，执行到charAt(0)时就会出现异常:
//java.lang.StringIndexOutOfBoundsException: String index out of range: 0
private static void loadCmdFile(String name, ListBuffer<String> args)
throws IOException
{
Reader r = new BufferedReader(new FileReader(name));
StreamTokenizer st = new StreamTokenizer(r);
//DEBUG.P("st="+st);
st.resetSyntax();
st.wordChars(' ', 255);
//DEBUG.P("st="+st);
st.whitespaceChars(0, ' ');
st.commentChar('#');
st.quoteChar('"');
st.quoteChar('\'');
while (st.nextToken() != st.TT_EOF) {
args.append(st.sval);
DEBUG.P("st.sval="+st.sval);
//if(st.sval.length()>0) args.append(st.sval);
}
r.close();
}
}