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137 lines
3.9 KiB
137 lines
3.9 KiB
/*
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* This file is part of a Java port of the program ltl2dstar
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* (http://www.ltl2dstar.de/) for PRISM (http://www.prismmodelchecker.org/)
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* Copyright (C) 2005-2007 Joachim Klein <j.klein@ltl2dstar.de>
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* Copyright (c) 2007 Carlos Bederian
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package jltl2dstar;
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import jltl2ba.APSet;
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import jltl2ba.SimpleLTL;
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import jltl2ba.SimpleLTL.LTLType;
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import prism.PrismException;
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public class LTL2DRA {
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private Options_Safra _safra_opt;
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public LTL2DRA(Options_Safra safra_opt) {
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_safra_opt = safra_opt;
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}
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/**
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* Convert an LTL formula to a DRA.
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* @param ltl the LTL formula
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* @param options which operators are allowed
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* @return a shared_ptr to the DRA
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*/
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private DRA LTLtoDRA_rec(SimpleLTL ltl, APSet apset, Options_LTL2DRA options) throws PrismException
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{
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SimpleLTL ltl_pnf = ((SimpleLTL)ltl.clone()).simplify();
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if (options.allow_union && ltl_pnf.kind == LTLType.OR) {
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SimpleLTL ltl_left = ltl_pnf.left;
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SimpleLTL ltl_right = ltl_pnf.right;
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Options_LTL2DRA rec_opt = options.clone();
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rec_opt.recursion();
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DRA dra_left = LTLtoDRA_rec(ltl_left, apset, rec_opt);
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DRA dra_right = LTLtoDRA_rec(ltl_right, apset, rec_opt);
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return dra_left.calculateUnion(dra_right, options.opt_safra.union_trueloop, options.detailed_states);
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}
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/* if (options.safety) {
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LTLSafetyAutomata lsa;
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DRA_ptr safety_dra(lsa.ltl2dra<DRA_t>(ltl,
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options.scheck_path));
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if (safety_dra.get()!=0) {
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return safety_dra;
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}
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}
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*/
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NBA nba = ltl_pnf.toNBA(apset);
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if (nba == null) {
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throw new PrismException("Couldn't create NBA from LTL formula");
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}
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NBA2DRA nba2dra = new NBA2DRA(options.opt_safra, false);
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DRA dra = nba2dra.convert(nba, 0);
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if (options.optimizeAcceptance) {
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dra.optimizeAcceptanceCondition();
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}
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if (options.bisim) {
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DRAOptimizations dra_optimizer = new DRAOptimizations();
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dra = dra_optimizer.optimizeBisimulation(dra, false, false, false);
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}
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return dra;
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}
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/* public DRA LTLtoDRA(SimpleLTL ltl, Options_LTL2DRA options) throws PrismException {
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return LTLtoDRA_rec(ltl, ltl.getAPs(), options);
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} */
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public DRA LTLtoDRA(SimpleLTL ltl, APSet apset, Options_LTL2DRA options) throws PrismException {
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return LTLtoDRA_rec(ltl, apset, options);
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}
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/**
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* Convert an NBA to a DRA using Safra's algorithm.
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* If limit is specified (>0), the conversion is
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* aborted with LimitReachedException when the number of
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* states exceeds the limit.
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* @param nba the formula
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* @param limit a limit on the number of states (0 for no limit)
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* @param detailedStates save detailed interal information (Safra trees)
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* in the generated states
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* @param stutter_information Information about the symbols that can be stuttered
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* @return a shared_ptr to the created DRA
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*/
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// DRA nba2dra(NBA nba, int limit, boolean detailedStates, StutterSensitivenessInformation::ptr stutter_information) {
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DRA nba2dra(NBA nba, int limit, boolean detailedStates) throws PrismException {
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DRA dra = null;
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NBA2DRA nba2dra = new NBA2DRA(_safra_opt, detailedStates);
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try {
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dra = nba2dra.convert(nba, limit);
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} catch (PrismException e) {
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dra = null;
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// rethrow to notify caller
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throw e;
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}
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return dra;
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}
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/** Get the options for Safra's algorithm */
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public Options_Safra getOptions() {
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return _safra_opt;
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}
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}
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