/* CreateForInitializer Copyright (C) 1998-2002 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: CreateForInitializer.java,v 4.17.4.1 2002/05/28 17:34:08 hoenicke Exp $
 */

package alterrs.jode.flow;

import alterrs.jode.GlobalOptions;
import alterrs.jode.expr.CombineableOperator;

public class CreateForInitializer {

	/**
	 * This combines an variable initializer into a for statement
	 * 
	 * @param forBlock
	 *            the for block
	 * @param last
	 *            the lastModified of the flow block.
	 */
	public static boolean transform(LoopBlock forBlock, StructuredBlock last) {

		if (!(last.outer instanceof SequentialBlock))
			return false;

		SequentialBlock sequBlock = (SequentialBlock) last.outer;

		if (!(sequBlock.subBlocks[0] instanceof InstructionBlock))
			return false;

		InstructionBlock init = (InstructionBlock) sequBlock.subBlocks[0];

		if (!init.getInstruction().isVoid()
				|| !(init.getInstruction() instanceof CombineableOperator)
				|| !forBlock.conditionMatches((CombineableOperator) init
						.getInstruction()))
			return false;

		if (GlobalOptions.verboseLevel > 0)
			GlobalOptions.err.print('f');

		forBlock.setInit((InstructionBlock) sequBlock.subBlocks[0]);
		return true;
	}
}
