simpfg.cc 1.48 KB
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// -*- coding: utf-8 -*-
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// Copyright (C) 2010, 2012, 2014, 2015 Laboratoire de Recherche et
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// Développement de l'Epita (LRDE).
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// Copyright (C) 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
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// département Systèmes Répartis Coopératifs (SRC), Université Pierre
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// et Marie Curie.
//
// 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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#include "simpfg.hh"

namespace spot
{
  namespace ltl
  {
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    formula simplify_f_g(formula p)
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    {
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      // 1 U p = Fp
      if (p.is(op::U) && p.nth(0).is_true())
	return formula::F(p.nth(1));
      // 0 R p = Gp
      if (p.is(op::R) && p.nth(0).is_false())
	return formula::G(p.nth(1));
      // p W 0 = Gp
      if (p.is(op::W) && p.nth(1).is_false())
	return formula::G(p.nth(0));
      // p M 1 = Fp
      if (p.is(op::M) && p.nth(1).is_true())
	return formula::F(p.nth(0));
      return p.map(simplify_f_g);
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    }

  }
}