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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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17
bin/man/spot-x.x
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@ -99,6 +99,23 @@ in third-party tools that output incorrect HOA (e.g., declaring
the automaton with property "univ-branch" when no universal branching
is actually used)
.TP
\fBSPOT_O_CHECK\fR
Specifies the default algorithm that should be used
by the \f(CWis_obligation()\fR function. The value should
be one of the following:
.RS
.IP 1
Make sure that the formula and its negation are
realizable by non-deterministic co-Büchi automata.
.IP 2
Make sure that the formula and its negation are
realizable by deterministic Büchi automata.
.IP 3
Make sure that the formula is realizable
by a weak and deterministic Büchi automata.
.RE
.TP
\fBSPOT_OOM_ABORT\fR
If this variable is set, Out-Of-Memory errors will \f(CWabort()\fR the