commandline.java

java编译器gjc源码 java编译环境

/**
 * @(#)CommandLine.java	1.10 03/01/23
 *
 * Copyright 2003 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.sun.tools.javac.v8;
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.v8.util.ListBuffer;


/**
 * Various utility methods for processing Java tool command line arguments.
 */
public class CommandLine {

    public CommandLine() {
        super();
    }

    /**
      * 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 {
        ListBuffer newArgs = new ListBuffer();
        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 (String[]) newArgs.toList().toArray(new String[newArgs.length()]);
    }

    private static void loadCmdFile(String name, ListBuffer args) throws IOException {
        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() != st.TT_EOF) {
            args.append(st.sval);
        }
        r.close();
    }
}