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remove_fin: improve behavior on unclean acceptance

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Related to #188.  This is a third fix that independently
makes `'utfilt --is-unambiguous -q smaller.hoa' instantaneous.

* spot/twaalgos/remfin.cc: Clean the received automaton if
necessary.
* bin/autfilt.cc: No need to call cleanup_acceptance_here() before
remove_fin() anymore.
* tests/core/remfin.test: Add an additional test.
* NEWS: Mention the change.
This commit is contained in:
Alexandre Duret-Lutz 2016-10-19 10:34:23 +02:00
parent 3dc084c4f6
commit 56f768f5a6
4 changed files with 363 additions and 4 deletions
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14
spot/twaalgos/remfin.cc
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@ -517,6 +517,20 @@ namespace spot
if (auto maybe = rabin_to_buchi_maybe(aut))
return maybe;
{
// We want a clean acceptance condition, i.e., one where all
// sets are useful. If that is not the case, clean it first.
acc_cond::mark_t unused = aut->acc().all_sets();
for (auto& t: aut->edges())
{
unused -= t.acc;
if (!unused)
break;
}
if (unused)
return remove_fin(cleanup_acceptance(aut));
}
std::vector<acc_cond::acc_code> code;
std::vector<acc_cond::mark_t> rem;
std::vector<acc_cond::mark_t> keep;