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introduce is_obligation(f)

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This is not optimal yet because it still construct a minimal WDBA
internally, but it's better than the previous way to call
minimize_obligation() since it can avoid constructing the minimized
automaton in a few more cases.

* spot/tl/hierarchy.cc, spot/tl/hierarchy.hh: Introduce
is_obligation().
* bin/ltlfilt.cc: Wire it to --obligation.
* spot/twaalgos/minimize.cc: Implement is_wdba_realizable(),
needed by the above.
* tests/core/obligation.test: Test it.
* bin/man/spot-x.x, NEWS: Document it.
This commit is contained in:
Alexandre Duret-Lutz 2017-11-15 21:51:33 +01:00
parent f7ee9ed18e
commit 50fe34a55a
7 changed files with 214 additions and 29 deletions
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NEWS
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@ -112,6 +112,11 @@ New in spot 2.4.2.dev (not yet released)
will work either on f or its negation.
(see https://spot.lrde.epita.fr/hierarchy.html for details).
- A new function spot::is_obligation() can be used to test whether a
formula is an obligation. This is used by ltlfilt --obligation,
and the algorithm used can be controled by the SPOT_O_CHECK
environment variable (see the spot-x(7) man page for details).
- The new function spot::is_colored() checks if an automaton is colored
(i.e., every transition belongs to exactly one acceptance set)