sccfilter.hh 2.65 KB
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// Copyright (C) 2009, 2010, 2012 Laboratoire de Recherche et
// Developpement de l'Epita (LRDE).
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//
// 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
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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.
//
// 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
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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
# define SPOT_TGBAALGOS_SCCFILTER_HH

#include "tgba/tgba.hh"

namespace spot
{
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  class scc_map;
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  /// \brief Prune unaccepting SCCs and remove superfluous acceptance
  /// conditions.
  ///
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  /// This function will explore the SCCs of the automaton and remove
  /// dead SCCs (i.e. SCC that are not accepting, and those with no
  /// exit path leading to an accepting SCC).
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  ///
  /// Additionally, this will try to remove useless acceptance
  /// conditions.  This operation may diminish the number of
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  /// acceptance condition of the automaton (for instance when two
  /// acceptance conditions are always used together we only keep one)
  /// but it will never remove all acceptance conditions, even if it
  /// would be OK to have zero.
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  ///
  /// Acceptance conditions on transitions going to non-accepting SCC
  /// are all removed.  Acceptance conditions going to an accepting
  /// SCC and coming from another SCC are only removed if \a
  /// remove_all_useless is set.  The default value of \a
  /// 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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  ///
  /// If \a given_sm is supplied, the function will use its result
  /// without computing a map of its own.
  ///
  /// If \a susp is different from bddtrue, it should be a conjunction
  /// of (positive) variables to be removed from transitions going to
  /// non-accepting SCCs.  If early_susp is false, the previous
  /// variable are also removed from transitions entering an accepting
  /// SCC.  ignored is a conjunction of positive variables that should
  /// be removed everywhere.
  tgba* scc_filter(const tgba* aut, bool remove_all_useless = false,
		   scc_map* given_sm = 0, bdd susp = bddtrue,
		   bool early_susp = false, bdd ignored = bddtrue);
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}

#endif // SPOT_TGBAALGOS_SCC_HH