95d732e331
Part of issue #351. * spot/twaalgos/sccfilter.cc, spot/twaalgos/sccfilter.hh: Specialize for inherently-weak automata. * spot/twaalgos/postproc.cc: Simplify. * tests/core/dca2.test, tests/core/parity2.test, tests/core/prodor.test, tests/core/randomize.test, tests/python/automata.ipynb, tests/python/highlighting.ipynb, tests/python/product.ipynb, tests/python/remfin.py, tests/python/stutter-inv.ipynb: Adjust. * NEWS: Mention it.
95 lines
3.9 KiB
C++
95 lines
3.9 KiB
C++
// -*- coding: utf-8 -*-
|
|
// Copyright (C) 2009, 2010, 2012, 2013, 2014, 2015, 2018 Laboratoire de
|
|
// Recherche et Developpement de l'Epita (LRDE).
|
|
//
|
|
// 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/>.
|
|
|
|
#pragma once
|
|
|
|
#include <spot/misc/common.hh>
|
|
#include <bddx.h>
|
|
#include <spot/twa/fwd.hh>
|
|
|
|
namespace spot
|
|
{
|
|
class scc_info;
|
|
|
|
|
|
/// \brief Prune unaccepting SCCs and remove superfluous acceptance
|
|
/// conditions.
|
|
///
|
|
/// 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).
|
|
///
|
|
/// Additionally, for Generalized Büchi acceptance, this will try to
|
|
/// remove useless acceptance conditions. This operation may
|
|
/// diminish the number of 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.
|
|
///
|
|
/// Acceptance conditions on transitions going to rejecting SCCs 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
|
|
/// degeneralization) will work better if transitions going to an
|
|
/// accepting SCC are accepting.
|
|
///
|
|
/// If the input is inherently weak, the output will be a weak
|
|
/// automaton with state-based acceptance. The acceptance condition
|
|
/// is set to Büchi unless the input was co-Büchi or t (in which
|
|
/// case we keep this acceptance).
|
|
///
|
|
/// If \a given_sm is supplied, the function will use its result
|
|
/// without computing a map of its own.
|
|
///
|
|
/// \warning Calling scc_filter on a TωA that is not inherently weak
|
|
/// and has the SBA property (i.e., transitions leaving accepting
|
|
/// states are all marked as accepting) may destroy this property.
|
|
/// Use scc_filter_states() instead.
|
|
SPOT_API twa_graph_ptr
|
|
scc_filter(const const_twa_graph_ptr& aut, bool remove_all_useless = false,
|
|
scc_info* given_si = nullptr);
|
|
|
|
/// \brief Prune unaccepting SCCs.
|
|
///
|
|
/// This is an abridged version of scc_filter(), that preserves
|
|
/// state-based acceptance. I.e., if the input TωA has the SBA
|
|
/// property, (i.e., transitions leaving accepting states are all
|
|
/// marked as accepting), then the output TωA will also have that
|
|
/// property.
|
|
SPOT_API twa_graph_ptr
|
|
scc_filter_states(const const_twa_graph_ptr& aut,
|
|
bool remove_all_useless = false,
|
|
scc_info* given_si = nullptr);
|
|
|
|
/// \brief Prune unaccepting SCCs, superfluous acceptance
|
|
/// sets, and suspension variables.
|
|
///
|
|
/// In addition to removing useless states, and acceptance sets,
|
|
/// this remove all ignoredvars occurring in conditions, and all
|
|
/// suspvars in conditions leadings to non-accepting SCC (as well
|
|
/// as the conditions between two SCCs if early_susp is false).
|
|
///
|
|
/// This is used by compsusp(), and is probably useless for any
|
|
/// other use.
|
|
SPOT_API twa_graph_ptr
|
|
scc_filter_susp(const const_twa_graph_ptr& aut, bool remove_all_useless,
|
|
bdd suspvars, bdd ignoredvars, bool early_susp,
|
|
scc_info* given_si = nullptr);
|
|
}
|