cleanacc.cc 1.84 KB
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// -*- coding: utf-8 -*-
// Copyright (C) 2015 Laboratoire de Recherche et Développement
// de l'Epita.
//
// 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/>.

#include "tgbaalgos/cleanacc.hh"

namespace spot
{
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  tgba_digraph_ptr cleanup_acceptance_here(tgba_digraph_ptr aut)
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  {
    auto& acc = aut->acc();
    if (acc.num_sets() == 0)
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      return aut;
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    auto& c = aut->get_acceptance();
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    acc_cond::mark_t used_in_cond = c.used_sets();
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    acc_cond::mark_t used_in_aut = 0U;
    for (auto& t: aut->transitions())
      used_in_aut |= t.acc;

    auto useful = used_in_aut & used_in_cond;

    auto useless = acc.comp(useful);

    if (!useless)
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      return aut;
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    // Remove useless marks from the automaton
    for (auto& t: aut->transitions())
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      t.acc = t.acc.strip(useless);
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    // Remove useless marks from the acceptance condition
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    aut->set_acceptance(useful.count(), c.strip(useless, true));
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    // This may in turn cause even more set to be unused, because of
    // some simplifications, so do it again.
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    return cleanup_acceptance_here(aut);
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  }

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  tgba_digraph_ptr cleanup_acceptance(const_tgba_digraph_ptr aut)
  {
    return cleanup_acceptance_here(make_tgba_digraph(aut,
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						     twa::prop_set::all()));
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  }


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}