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sccfilter: some inherently-weak automata should have t acceptance

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* spot/twaalgos/sccfilter.cc: If an inherently-weak automaton has
no rejecting cycle, reduce its acceptance to t instead of Büchi.
* spot/twa/acc.hh (operator==, operator<): Fix comparisons of
true acceptances.
* NEWS: Mention these two changes.
* spot/twaalgos/sccfilter.hh: Update documentation.
* spot/twaalgos/determinize.cc (tgba_determinize): The call
to scc_filter assume that the input BA is never reduced to t
acceptance.  Call scc_filter with an extra option to ensure that.
* spot/twaalgos/postproc.cc (do_scc_filter): Adjust to add the
extra option when we want to build Büchi or coBuchi.
(ensure_ba): Don't mark trivial SCCs as accepting.
* tests/core/complement.test, tests/core/dstar.test,
tests/core/ltlsynt.test, tests/core/readsave.test,
tests/core/wdba2.test, tests/python/_product_susp.ipynb,
tests/python/automata-io.ipynb, tests/python/dualize.py,
tests/python/highlighting.ipynb, tests/python/intrun.py,
tests/python/setacc.py, tests/python/simstate.py,
tests/python/stutter-inv.ipynb, tests/python/zlktree.py: Adjust test
cases.
This commit is contained in:
Alexandre Duret-Lutz 2023-11-17 13:41:19 +01:00
parent 13377542cd
commit 0e71dd70c1
20 changed files with 857 additions and 842 deletions
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6
tests/python/setacc.py
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@ -1,6 +1,6 @@
#!/usr/bin/python3
# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2016, 2018, 2021, 2022 Laboratoire de Recherche et
# Copyright (C) 2016, 2018, 2021, 2022, 2023 Laboratoire de Recherche et
# Développement de l'EPITA.
#
# This file is part of Spot, a model checking library.
@ -104,10 +104,10 @@ except RuntimeError as e:
from gc import collect
acc = spot.translate('a').acc()
collect()
tc.assertEqual(acc, spot.acc_cond('Inf(0)'))
tc.assertEqual(acc, spot.acc_cond('t'))
acc = spot.translate('b').get_acceptance()
collect()
tc.assertEqual(acc, spot.acc_code('Inf(0)'))
tc.assertEqual(acc, spot.acc_code('t'))
c = spot.acc_cond('Fin(0)&Fin(1)&(Inf(2)|Fin(3))')