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strength: generalize is_safety_automaton to any type of automata

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Reported by Samuel Judson.

* spot/twaalgos/strength.cc (is_safety_automaton): Reimplement it.
* spot/twaalgos/strength.hh (is_safety_automaton): Update
documentation.
* tests/python/safety.py: New file.
* tests/Makefile.am: Add it.
* NEWS: Mention this change.
* THANKS: Add Samuel.
This commit is contained in:
Alexandre Duret-Lutz 2023-12-16 00:09:24 +01:00
parent e8c2b27ad2
commit 983964d037
6 changed files with 122 additions and 16 deletions
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52
tests/python/safety.py Normal file
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# -*- mode: python; coding: utf-8 -*-
# Copyright (C) by the Spot authors, see the AUTHORS file for details.
#
# 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/>.
import spot
from unittest import TestCase
tc = TestCase()
for f in ['Fb', 'GFa & GFb',
'(p0 W Fp0) R ((Gp1 & Fp1) | (F!p1 & G!p1)) & GFp0',
'GFp0 xor GFp1']:
aut = spot.translate(f, 'BA')
tc.assertFalse(spot.is_safety_automaton(aut))
aut = spot.translate(f, 'BA')
tc.assertFalse(spot.is_safety_automaton(aut))
aut = spot.translate(f, 'deterministic', 'complete')
tc.assertFalse(spot.is_safety_automaton(aut))
aut = spot.translate(f, 'generic', 'sbacc')
tc.assertFalse(spot.is_safety_automaton(aut))
for f in ['Gb', 'Ga|Gb|Gc', 'Fr->(!p U r)', 'p1 M F(p1 U (Gp0 U X(0)))',
'((p1 U !p0) M !FXp1) W p0', 'p0 & ((!p1 | (p1 W X!p1)) M p1)',
'(p0 W Fp0) R ((Gp1 & Fp1) | (F!p1 & G!p1))']:
aut = spot.translate(f, 'BA')
tc.assertTrue(spot.is_safety_automaton(aut))
ba = spot.translate(f, 'BA', 'complete')
tc.assertTrue(spot.is_safety_automaton(aut))
ba = spot.translate(f, 'deterministic', 'complete')
tc.assertTrue(spot.is_safety_automaton(aut))
ba = spot.translate(f, 'generic', 'sbacc')
tc.assertTrue(spot.is_safety_automaton(aut))