1ebd86de04
spot::iar() was fixed to handle correctly Rabin-like conditions. It also now supports Streett-like conditions. * NEWS, spot/twaalgos/postproc.cc: document it * spot/twaalgos/rabin2parity.cc, spot/twaalgos/rabin2parity.hh: implement it * tests/core/rabin2parity.test, tests/python/except.py: test it
55 lines
2.2 KiB
C++
55 lines
2.2 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2017-2018 Laboratoire de Recherche et Développement de l'Epita.
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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/twa/twagraph.hh>
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namespace spot
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{
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/// \ingroup twa_acc_transform
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/// \brief Turn a Rabin-like or Streett-like automaton into a parity automaton
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/// based on the index appearence record (IAR)
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///
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/// If the input automaton has n states and k pairs, the output automaton has
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/// at most k!*n states and 2k+1 colors. If the input automaton is
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/// deterministic, the output automaton is deterministic as well, which is the
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/// intended use case for this function. If the input automaton is
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/// non-deterministic, the result is still correct, but way larger than an
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/// equivalent Büchi automaton.
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/// If the input automaton is Rabin-like (resp. Streett-like), the output
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/// automaton has max odd (resp. min even) acceptance condition.
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/// Details on the algorithm can be found in:
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/// https://arxiv.org/pdf/1701.05738.pdf (published at TACAS 2017)
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///
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/// Throws an std::runtime_error if the input is neither Rabin-like nor
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/// Street-like.
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SPOT_API
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twa_graph_ptr
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iar(const const_twa_graph_ptr& aut);
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/// \ingroup twa_acc_transform
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/// \brief Turn a Rabin-like or Streett-like automaton into a parity automaton
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/// based on the index appearence record (IAR)
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///
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/// Returns nullptr if the input automaton is neither Rabin-like nor
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/// Streett-like, and calls spot::iar() otherwise.
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SPOT_API
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twa_graph_ptr
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iar_maybe(const const_twa_graph_ptr& aut);
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}
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