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complement: reset the terminal property

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Reported by Thomas Medioni.

* spot/twaalgos/complement.cc: Here.
* tests/core/complement.test: Add a test case.
* NEWS: Mention it.
This commit is contained in:
Alexandre Duret-Lutz 2017-03-27 21:39:16 +02:00
parent cdf699ff23
commit 73bb562bf5
3 changed files with 38 additions and 13 deletions
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14
spot/twaalgos/complement.cc
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@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2013, 2014, 2015 Laboratoire de Recherche et
// Copyright (C) 2013-2015, 2017 Laboratoire de Recherche et
// Développement de l'Epita.
//
// This file is part of Spot, a model checking library.
@ -18,7 +18,7 @@
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include <spot/twaalgos/complement.hh>
#include <spot/twaalgos/sccinfo.hh>
#include <spot/twaalgos/isdet.hh>
#include <spot/twaalgos/complete.hh>
#include <spot/twaalgos/cleanacc.hh>
@ -27,9 +27,19 @@ namespace spot
twa_graph_ptr
dtwa_complement(const const_twa_graph_ptr& aut)
{
if (!is_deterministic(aut))
throw
std::runtime_error("dtwa_complement() requires a deterministic input");
// Simply complete the automaton, and complement its acceptance.
auto res = cleanup_acceptance_here(complete(aut));
res->set_acceptance(res->num_sets(), res->get_acceptance().complement());
// Complementing the acceptance is likely to break the terminal
// property, but not weakness. We make a useless call to
// prop_keep() just so we remember to update it in the future if a
// new argument is added.
res->prop_keep({true, true, true, true, true});
res->prop_terminal(trival::maybe());
return res;
}
}