413eab1d32
Reported by Shufang Zhu. * spot/tl/ltlf.cc, spot/tl/ltlf.hh: Fix the transltion and update the comments. * tests/core/ltlfilt.test: Adjust test cases. * NEWS: Mention the fix. * THANKS: Add Shufang Zhu.
50 lines
2.1 KiB
C++
50 lines
2.1 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2016 Laboratoire de Recherche et Développement de
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// 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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#pragma once
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#include <spot/tl/formula.hh>
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namespace spot
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{
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/// \ingroup tl_rewriting
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/// \brief Convert an LTLf into an LTL formula.
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///
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/// This is based on De Giacomo & Vardi (IJCAI'13) reduction from
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/// LTLf (finite-LTL) to LTL.
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///
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/// In this reduction, finite words are extended into infinite words
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/// in which a new atomic proposition <code>alive</code> marks the
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/// prefix of the infinite word that corresponds to the original
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/// finite word. The formula is rewritten to ensure that the
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/// eventualities occur during the "alive" portion. For instance
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/// <code>a U b</code> becomes
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/// <code>alive&(a U (b & alive))&(alive U G!alive)</code>.
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///
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/// The \a alive argument can be used to change the name of the
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/// atomic property used to introduce. Additionally if \a alive is
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/// a string starting with and exclamation mark, e.g.,
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/// <code>!dead</code> then the atomic property will be built from
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/// the rest of the string, and its negation will be used in the
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/// transformation. Using <code>!dead</code> rather than
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/// <code>alive</code> makes more sense if the state-space
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/// introduces a <code>dead</code> property on states representing
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/// the end of finite computations.
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SPOT_API formula from_ltlf(formula f, const char* alive = "alive");
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}
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