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dbranch: fix handling of state-based acceptance

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Fixes issue #525.

* spot/twaalgos/dbranch.hh, NEWS: Document.
* spot/twaalgos/dbranch.cc: Detect cases where the acceptance should
be changed from state-based to transition-based.
* tests/python/dbranch.py: Add a test case.
This commit is contained in:
Alexandre Duret-Lutz 2023-02-03 09:35:46 +01:00
parent bdaa31ef21
commit 43b4d80da1
4 changed files with 59 additions and 8 deletions
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29
tests/python/dbranch.py
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@ -1,5 +1,5 @@
# -*- mode: python; coding: utf-8 -*-
# Copyright (C) 2022 Laboratoire de Recherche et
# Copyright (C) 2022, 2023 Laboratoire de Recherche et
# Développement de l'Epita (LRDE).
#
# This file is part of Spot, a model checking library.
@ -145,3 +145,30 @@ State: 5
State: 6
[t] 6
--END--""")
# Running delay_branching_here on state-based acceptance may require
# the output to use transition-based acceptance. (Issue #525.)
a = spot.automaton("""
HOA: v1 States: 4 Start: 0 AP: 2 "a" "b" Acceptance: 1 Inf(0) --BODY--
State: 0 [0] 1 [0] 2 State: 1 [1] 3 State: 2 {0} [!1] 3 State: 3 [t] 0
--END--""")
copy = spot.make_twa_graph(a, spot.twa_prop_set.all())
if spot.delay_branching_here(a):
a.purge_unreachable_states()
tc.assertTrue(spot.are_equivalent(a, copy))
tc.assertEqual(a.to_str(), """HOA: v1
States: 3
Start: 0
AP: 2 "b" "a"
acc-name: Buchi
Acceptance: 1 Inf(0)
properties: trans-labels explicit-labels trans-acc deterministic
--BODY--
State: 0
[1] 1
State: 1
[0] 2
[!0] 2 {0}
State: 2
[t] 0
--END--""")