db124d02c0
implement is_safety_mwdba(). Note: I swapped the name of safety and guarantee when I implemented is_safety_automaton() on 2010-03-20. Fortunately, is_safety_automaton() was only used where is_guarantee_automaton() would have been correct. * src/tgbaalgos/safety.cc (is_guarantee_automaton): Rename as ... (is_guarantee_automaton): ... this. (is_safety_mwdba): New function. * src/tgbaalgos/safety.hh: Adjust and add documentation. * src/tgbaalgos/minimize.cc: Use is_guarantee_automaton() instead of is_safety_automaton(). * src/tgbatests/safety.test: Rename as ... * src/tgbatests/obligation.test: ... this, and augment the test. * src/tgbatest/Makefile.am: Adjust. * src/tgbatest/ltl2tgba.cc (-O): Display whether a formula represent a safety, guarantee, or obligation property. * NEWS: Adjust.
64 lines
2.4 KiB
C++
64 lines
2.4 KiB
C++
// Copyright (C) 2010, 2011 Laboratoire de Recherche et Développement de
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// l'Epita (LRDE)
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// 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 Spot; see the file COPYING. If not, write to the Free
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// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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// 02111-1307, USA.
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#ifndef SPOT_TGBAALGOS_SAFETY_HH
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# define SPOT_TGBAALGOS_SAFETY_HH
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#include "scc.hh"
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namespace spot
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{
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/// \brief Whether an automaton represents a guarantee property.
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///
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/// A weak deterministic TGBA represents a guarantee property if any
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/// accepting path ends on an accepting state with only one
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/// transition that is a self-loop labelled by true.
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///
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/// Note that in the general case, this is only a sufficient
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/// condition : some guarantee automata might not be recognized with
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/// this check e.g. because of some non-determinism in the
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/// automaton. In that case, you should interpret a \c false return
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/// value as "I don't know".
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///
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/// If you apply this function on a weak deterministic TGBA
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/// (e.g. after a successful minimization with
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/// minimize_obligation()), then the result leaves no doubt: false
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/// really means that the automaton is not a guarantee property.
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///
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/// \param aut the automaton to check
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///
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/// \param sm an scc_map of the automaton if available (it will be
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/// built otherwise. If you supply an scc_map you should call
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/// build_map() before passing it to this function.
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bool is_guarantee_automaton(const tgba* aut, const scc_map* sm = 0);
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/// \brief Whether a minimized WDBA represents a safety property.
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///
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/// A minimized WDBA (as returned by a successful run of
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/// minimize_obligation()) represent safety property if it contains
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/// only accepting transitions.
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///
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/// \param aut the automaton to check
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bool is_safety_mwdba(const tgba* aut);
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}
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#endif // SPOT_TGBAALGOS_SAFETY_HH
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