When dealternating the VWAA for GFa, our result had two states that
could not be fused by simulation because of unmatched acceptance mark.
With this change, the result can be simplified.
* spot/twaalgos/alternation.cc: Here.
* tests/core/alternating.test, tests/python/alternation.ipynb: Update
test case.
* NEWS: Mention it.
spot::acc_cond::mark_t is implemented as a bit vector using a single
unsigned, and implicit conversions between mark_t and unsigned may be
confusing. We try to use the proper interface.
* bin/autfilt.cc, bin/ltlsynt.cc, spot/kripke/kripke.cc,
spot/misc/game.hh, spot/parseaut/parseaut.yy, spot/priv/accmap.hh,
spot/ta/ta.cc, spot/ta/taexplicit.cc, spot/ta/taproduct.cc,
spot/taalgos/emptinessta.cc, spot/taalgos/tgba2ta.cc, spot/twa/acc.cc,
spot/twa/acc.hh, spot/twa/taatgba.cc, spot/twa/taatgba.hh,
spot/twa/twagraph.hh, spot/twaalgos/alternation.cc,
spot/twaalgos/cleanacc.cc, spot/twaalgos/cobuchi.cc,
spot/twaalgos/complete.cc, spot/twaalgos/couvreurnew.cc,
spot/twaalgos/degen.cc, spot/twaalgos/dot.cc,
spot/twaalgos/dtwasat.cc, spot/twaalgos/dualize.cc,
spot/twaalgos/emptiness.cc, spot/twaalgos/gtec/ce.cc,
spot/twaalgos/gtec/gtec.cc, spot/twaalgos/gtec/sccstack.cc,
spot/twaalgos/gv04.cc, spot/twaalgos/hoa.cc, spot/twaalgos/lbtt.cc,
spot/twaalgos/ltl2tgba_fm.cc, spot/twaalgos/magic.cc,
spot/twaalgos/ndfs_result.hxx, spot/twaalgos/rabin2parity.cc,
spot/twaalgos/randomgraph.cc, spot/twaalgos/remfin.cc,
spot/twaalgos/sbacc.cc, spot/twaalgos/sccfilter.cc,
spot/twaalgos/sccinfo.cc, spot/twaalgos/sccinfo.hh,
spot/twaalgos/se05.cc, spot/twaalgos/sepsets.cc,
spot/twaalgos/simulation.cc, spot/twaalgos/strength.cc,
spot/twaalgos/stripacc.cc, spot/twaalgos/stutter.cc,
spot/twaalgos/sum.cc, spot/twaalgos/tau03.cc,
spot/twaalgos/tau03opt.cc, spot/twaalgos/totgba.cc,
spot/twaalgos/toweak.cc, python/spot/impl.i, tests/core/acc.cc,
tests/core/twagraph.cc: do not confuse mark_t and unsigned
* tests/python/acc_cond.ipynb: warn about possible change of the API
* spot/twaalgos/sccinfo.hh, spot/twaalgos/sccinfo.cc: Add an optional
argument to abort on accepting SCC, to not keep track of SCC states,
and some one_accepting_scc() method.
* NEWS: Mention it.
* bin/ltlcross.cc, spot/twaalgos/alternation.cc,
spot/twaalgos/cobuchi.cc, spot/twaalgos/degen.cc,
spot/twaalgos/determinize.cc, spot/twaalgos/dtbasat.cc,
spot/twaalgos/dtwasat.cc, spot/twaalgos/isunamb.cc,
spot/twaalgos/powerset.cc, spot/twaalgos/remfin.cc,
spot/twaalgos/sbacc.cc, spot/twaalgos/sccfilter.cc,
spot/twaalgos/totgba.cc: Adjust arguments passed to scc_info.
Algorithms that remove transitions can turn a non-deterministic
automaton into a deterministic one, so we need to be able to specify
that determinism can be improved (as opposed to preserved).
* spot/twa/twa.hh (twa::prop_set::improve_det): New attribute.
(twa::prop_keep, twa::prop_copy): Honor it.
* spot/tl/exclusive.cc, spot/twaalgos/alternation.cc,
spot/twaalgos/complete.cc, spot/twaalgos/degen.cc,
spot/twaalgos/determinize.cc, spot/twaalgos/mask.cc,
spot/twaalgos/minimize.cc, spot/twaalgos/remfin.cc,
spot/twaalgos/remprop.cc, spot/twaalgos/sbacc.cc,
spot/twaalgos/sccfilter.cc, spot/twaalgos/simulation.cc,
spot/twaalgos/strength.cc, spot/twaalgos/stutter.cc,
spot/twaalgos/totgba.cc: Adjust calls to prop_keep() and
prop_copy().
This mixes the subset construction (for 1-state rejecting SCCs) and
the breakpoint construction (for larger rejecting SCCs). The
algorithm should probably be rewritten in a cleaner and more efficient
way, but that should do for a first version. It should be easy to
extend it to support Büchi acceptance (since the breakpoint
construction works for this) when we need it.
* spot/twaalgos/alternation.hh,
spot/twaalgos/alternation.cc (remove_alternation): New function.
* tests/python/alternation.ipynb: New file.
* tests/Makefile.am, doc/org/tut.org: Add it.
This should will come handy to implement the convertion from LTL to
alternating automata, and to handle automata with multiple initial
states.
* spot/twaalgos/alternation.hh, spot/twaalgos/alternation.cc: New files.
* spot/twaalgos/Makefile.am: Add them.
* python/spot/impl.i: Add bindings.
* tests/python/alternating.py: Test states_and.
