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minimize_wdba: fix handling of input with useless SCCs

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* spot/twaalgos/minimize.cc (minimize_wdba): Diminish the color of
terminal SCCs that are incomplete, as if they had a non-accepting
sink as successor.
* spot/twaalgos/strength.hh, spot/twaalgos/strength.cc
(is_terminal_automaton): Add an option to ignore trivial SCC as we did
before, since it matters for deciding membership to the guarantee
class.
(is_safety_mwdba): Rewrite as ...
(is_safety_automaton): ... generalizating to any acceptance, and
ignoring trivial SCCs.
* bin/ltlfilt.cc, python/ajax/spotcgi.in, spot/tl/hierarchy.cc,
tests/core/ikwiad.cc: Adjust usage of is_terminal_automaton and
is_safety_automaton().
* tests/core/hierarchy.test: Add a problematic formula as test-case.
* NEWS: Mention the bug.
This commit is contained in:
Alexandre Duret-Lutz 2017-01-11 18:06:41 +01:00
parent 7d9ce0d6fc
commit c9918f6407
9 changed files with 94 additions and 50 deletions
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7
spot/tl/hierarchy.cc
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@ -66,8 +66,11 @@ namespace spot
auto min = minimize_obligation(aut, f);
if (aut != min) // An obligation.
{
bool g = is_terminal_automaton(min);
bool s = is_safety_mwdba(min);
scc_info si(min);
// The minimba WDBA can have some trivial accepting SCCs
// that we should ignore in is_terminal_automaton().
bool g = is_terminal_automaton(min, &si, true);
bool s = is_safety_automaton(min, &si);
if (g)
return s ? 'B' : 'G';
else