NNFTransformer.java Source File

00001 package edu.ksu.cis.bandera.specification.nnf;
00002 
00003 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
00004  * Bandera, a Java(TM) analysis and transformation toolkit           *
00005  * Copyright (C) 1998-2001 SAnToS Laboratories (santos@cis.ksu.edu)  *
00006 
00007  * All rights reserved.                                              *
00008  *                                                                   *
00009  * This work was done as a project in the SAnToS Laboratory,         *
00010  * Department of Computing and Information Sciences, Kansas State    *
00011  * University, USA (http://www.cis.ksu.edu/santos).                  *
00012  * It is understood that any modification not identified as such is  *
00013  * not covered by the preceding statement.                           *
00014  *                                                                   *
00015  * This work is free software; you can redistribute it and/or        *
00016  * modify it under the terms of the GNU Library General Public       *
00017  * License as published by the Free Software Foundation; either      *
00018  * version 2 of the License, or (at your option) any later version.  *
00019  *                                                                   *
00020  * This work is distributed in the hope that it will be useful,      *
00021  * but WITHOUT ANY WARRANTY; without even the implied warranty of    *
00022  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU *
00023  * Library General Public License for more details.                  *
00024  *                                                                   *
00025  * You should have received a copy of the GNU Library General Public *
00026  * License along with this toolkit; if not, write to the             *
00027  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,      *
00028  * Boston, MA  02111-1307, USA.                                      *
00029  *                                                                   *
00030  * Java is a trademark of Sun Microsystems, Inc.                     *
00031  *                                                                   *
00032  * To submit a bug report, send a comment, or get the latest news on *
00033  * this project and other SAnToS projects, please visit the web-site *
00034  *                http://www.cis.ksu.edu/santos                      *
00035  * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
00036 import edu.ksu.cis.bandera.specification.nnf.ltl.*;
00037 import java.io.*;
00038 public class NNFTransformer {
00039 /**
00040  * 
00041  * @return java.lang.String
00042  * @param ltlFormula java.lang.String
00043  */
00044 public static String transformLTL(String ltlFormula) {
00045     try {
00046         StringReader r = new StringReader(ltlFormula);
00047         parser parser_obj = new parser(new Yylex(r));
00048         parser_obj.parse();
00049         r.close();
00050         parser_obj.tree.nnf();
00051         StringWriter w = new StringWriter();
00052         parser_obj.tree.ltlprint(w);
00053         String result = w.toString();
00054         w.close();
00055         return result;
00056     } catch (Exception e) {
00057         e.printStackTrace();
00058         return null;
00059     }
00060 }
00061 }