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remove_x: Implement detection of stutter-invariant LTL formulas.

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* src/bin/ltlfilt.cc: Add options --remove-x and --stutter-invariant.
* src/ltlvisit/remove_x.cc, src/ltlvisit/remove_x.hh: New files.
* src/ltlvisit/Makefile.am: Add them.
* src/ltltest/remove_x.test: New file.
* src/ltltest/Makefile.am: Add it.
* NEWS: Mention the new algorithms.
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Alexandre Duret-Lutz 2013-04-05 18:51:05 +02:00
parent 8896c3d5da
commit a7bfb42de7
7 changed files with 282 additions and 1 deletions
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src/ltlvisit/remove_x.hh Normal file
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// Copyright (C) 2013 Laboratoire de Recherche et Developpement de
// l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
//
// Spot is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// Spot 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 General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#ifndef SPOT_LTLVISIT_REMOVE_X_HH
# define SPOT_LTLVISIT_REMOVE_X_HH
namespace spot
{
namespace ltl
{
class formula;
/// \brief Rewrite a stutter-insensitive formula \a f without
/// using the X operator.
///
/// This function may also be applied to stutter-sensitive formulas,
/// but in that case the resulting formula is not equivalent.
///
/// \verbatim
/// @Article{ etessami.00.ipl,
/// author = {Kousha Etessami},
/// title = {A note on a question of {P}eled and {W}ilke regarding
/// stutter-invariant {LTL}},
/// journal = {Information Processing Letters},
/// volume = {75},
/// number = {6},
/// year = {2000},
/// pages = {261--263}
/// }
/// \endverbatim
const formula* remove_x(const formula* f);
/// \brief Whether an LTL formula \a f is stutter-insensitive.
///
/// This is simply achieved by checking whether the output of
/// <code>remove_x(f)</code> is equivalent to \a f. This only
/// works for LTL formulas, not PSL formulas.
///
/// \verbatim
/// @Article{ etessami.00.ipl,
/// author = {Kousha Etessami},
/// title = {A note on a question of {P}eled and {W}ilke regarding
/// stutter-invariant {LTL}},
/// journal = {Information Processing Letters},
/// volume = {75},
/// number = {6},
/// year = {2000},
/// pages = {261--263}
/// }
/// \endverbatim
bool is_stutter_insensitive(const formula* f);
}
}
#endif // SPOT_LTLVISIT_ETESSAMI00_HH