/* GlobalOptions Copyright (C) 1999-2002 Jochen Hoenicke.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; see the file COPYING.LESSER.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * $Id$
 */

package net.sf.jode;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class GlobalOptions {
    public final static String version = "@VERSION@";
    public final static String email = "jochen@gnu.org";
    public final static String copyright = 
	"Jode (c) 1998-2004 Jochen Hoenicke <"+email+">";
    public final static String URL = "http://jode.sourceforge.net/";

    public static PrintWriter err = new PrintWriter(System.err, true);
    public static int verboseLevel   = 0;
    public static int debuggingFlags = 0;

    public static final int DEBUG_BYTECODE = 0x001;
    public static final int DEBUG_VERIFIER = 0x002;
    public static final int DEBUG_TYPES    = 0x004;
    public static final int DEBUG_FLOW     = 0x008;
    public static final int DEBUG_INOUT    = 0x010;
    public static final int DEBUG_ANALYZE  = 0x020;
    public static final int DEBUG_LVT      = 0x040;
    public static final int DEBUG_CHECK    = 0x080;
    public static final int DEBUG_LOCALS   = 0x100;
    public static final int DEBUG_CONSTRS  = 0x200;
    public static final int DEBUG_INTERPRT = 0x400;

    public static final String[] debuggingNames = {
	"bytecode", "verifier", "types", "flow", 
	"inout", "analyze", "lvt", "check", "locals",
	"constructors", "interpreter"
    };

    public static void usageDebugging() {
	err.println("Debugging option: --debug=flag1,flag2,...");
	err.println("possible flags:");
	err.println("  bytecode     " +
		    "show bytecode, as it is read from class file.");
	err.println("  verifier     " +
		    "show result of bytecode verification.");
	err.println("  types        " +
		    "show type intersections");
	err.println("  flow         " +
		    "show flow block merging.");
	err.println("  analyze      " +
		    "show T1/T2 analyzation of flow blocks.");
	err.println("  inout        " +
		    "show in/out set analysis.");
	err.println("  lvt          " +
		    "dump LocalVariableTable.");
	err.println("  check        " +
		    "do time consuming sanity checks.");
	err.println("  locals       " +
		    "dump local merging information.");
	err.println("  constructors " +
		    "dump constructor simplification.");
	err.println("  interpreter  " +
		    "debug execution of interpreter.");
	System.exit(0);
    }
    
    /**
     * Parse the argument given to the debugging flag.
     * @exception IllegalArgumentException 
     *    if a problem occured while parsing the argument.
     */
    public static boolean setDebugging(String debuggingString) {
	if (debuggingString.length() == 0 || debuggingString.equals("help")) {
	    usageDebugging();
	    throw new IllegalArgumentException();
	}

	StringTokenizer st = new StringTokenizer(debuggingString, ",");
    next_token:
	while (st.hasMoreTokens()) {
	    String token = st.nextToken().intern();
	    for (int i=0; i<debuggingNames.length; i++) {
		if (token == debuggingNames[i]) {
		    debuggingFlags |= 1 << i;
		    continue next_token;
		}
	    }
	    throw new IllegalArgumentException("Illegal debugging flag: "
					       +token);
	}
	return true;
    }
}