53c6923567
* src/tgbaalgos/compsusp.cc, src/tgbaalgos/compsusp.hh: New files. * src/tgbaalgos/Makefile.am: Add them. * src/tgbaalgos/sccfilter.cc, src/tgbaalgos/sccfilter.hh: Add option for suspended labels removal. * src/tgbatest/ltl2tgba.cc, src/tgbatest/spotlbtt.test: Test it.
65 lines
2.6 KiB
C++
65 lines
2.6 KiB
C++
// Copyright (C) 2009, 2010, 2012 Laboratoire de Recherche et
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// Developpement de 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 3 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 this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef SPOT_TGBAALGOS_SCCFILTER_HH
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# define SPOT_TGBAALGOS_SCCFILTER_HH
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#include "tgba/tgba.hh"
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namespace spot
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{
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class scc_map;
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/// \brief Prune unaccepting SCCs and remove superfluous acceptance
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/// conditions.
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///
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/// This function will explore the SCCs of the automaton and remove
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/// dead SCCs (i.e. SCC that are not accepting, and those with no
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/// exit path leading to an accepting SCC).
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///
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/// Additionally, this will try to remove useless acceptance
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/// conditions. This operation may diminish the number of
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/// acceptance condition of the automaton (for instance when two
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/// acceptance conditions are always used together we only keep one)
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/// but it will never remove all acceptance conditions, even if it
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/// would be OK to have zero.
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///
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/// Acceptance conditions on transitions going to non-accepting SCC
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/// are all removed. Acceptance conditions going to an accepting
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/// SCC and coming from another SCC are only removed if \a
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/// remove_all_useless is set. The default value of \a
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/// remove_all_useless is \c false because some algorithms (like the
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/// degeneralization) will work better if transitions going to an
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/// accepting SCC are accepting.
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///
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/// If \a given_sm is supplied, the function will use its result
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/// without computing a map of its own.
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///
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/// If \a susp is different from bddtrue, it should be a conjunction
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/// of (positive) variables to be removed from transitions going to
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/// non-accepting SCCs. If early_susp is false, the previous
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/// variable are also removed from transitions entering an accepting
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/// SCC. ignored is a conjunction of positive variables that should
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/// be removed everywhere.
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tgba* scc_filter(const tgba* aut, bool remove_all_useless = false,
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scc_map* given_sm = 0, bdd susp = bddtrue,
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bool early_susp = false, bdd ignored = bddtrue);
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}
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#endif // SPOT_TGBAALGOS_SCC_HH
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