alarsyo/spot
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

fix several algorithms that incorrectly preserved !weak

Browse source 
This massive set of changes was triggered by issue #546.
In addition to the better handling of !weak, this also adds some
weak properties in a few places.

* spot/twaalgos/product.cc (product_aux): Throw some exception
if an automaton with t or f acceptance has the !weak property.  This
is a cheap sanity check to help detect algorithms that incorrectly
assumed !weak input would necessarily become !weak output.
* spot/twaalgos/hoa.cc (print_hoa): Likewise, also do not assume
that terminal implies very-weak.
* spot/parseaut/parseaut.yy: Add several diagnostics for similar
cases.  E.g., a one-state automaton cannot be declared as !very-weak.
* tests/core/parseaut.test: Check those new diagnostics.
* spot/twa/twa.cc (twa::intersecting_run): Temporary remove the weak
property by setting it to maybe, not to false.
* spot/twaalgos/minimize.cc, spot/twaalgos/parity.cc,
spot/twaalgos/sccfilter.cc, spot/twaalgos/simulation.cc: Account for
the fact that these algorithm may in fact improve the weakness.
* spot/twaalgos/strength.cc: Only look at colors used by the
acceptance condition when deciding weakness.
* spot/twaalgos/synthesis.cc: Declare the strategy as weak.
* bin/randaut.cc: Add weak to automata with t/f acceptance.
* spot/kripke/kripke.hh: Make kripke structures as weak.
* tests/core/acc_word.test, tests/core/alternating.test,
tests/core/complement.test, tests/core/complete.test,
tests/core/ltlsynt.test, tests/core/randomize.test,
tests/core/readsave.test, tests/core/remfin.test,
tests/core/sccsimpl.test, tests/core/strength.test,
tests/core/wdba2.test, tests/ltsmin/kripke.test,
tests/python/automata-io.ipynb, tests/python/automata.ipynb,
tests/python/dbranch.py, tests/python/highlighting.ipynb,
tests/python/kripke.py, tests/python/ltsmin-dve.ipynb,
tests/python/mealy.py, tests/python/simstate.py: Adjust all these test
cases.
* NEWS: Mention the fixes.
This commit is contained in:
Alexandre Duret-Lutz 2023-11-09 22:13:05 +01:00
parent ac05035267
commit 67b5d2aa9a
34 changed files with 287 additions and 164 deletions
Download patch file Download diff file Expand all files Collapse all files

9
spot/twaalgos/hoa.cc
View file

@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2014-2022 Laboratoire de Recherche et
// Copyright (C) 2014-2023 Laboratoire de Recherche et
// Developpement de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
@ -507,6 +507,11 @@ namespace spot
}
}
if (SPOT_UNLIKELY(aut->prop_weak().is_false()
&& (aut->acc().is_t() || aut->acc().is_f())))
throw std::runtime_error("print_hoa(): automaton is declared not weak, "
"but the acceptance makes this impossible");
metadata md(aut, implicit_labels, state_labels);
if (acceptance == Hoa_Acceptance_States && !md.has_state_acc)
@ -724,7 +729,7 @@ namespace spot
}
if (aut->prop_terminal())
prop(" terminal");
if (aut->prop_very_weak() && (verbose || aut->prop_terminal() != true))
if (aut->prop_very_weak())
prop(" very-weak");
if (aut->prop_weak() && (verbose || (aut->prop_terminal() != true &&
aut->prop_very_weak() != true)))