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dstar: implement dra_to_dba()

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This is an implementation of Krishnan's ISAAC'94 paper to convert
deterministic Rabin automata into DBA when possible.

* src/dstarparse/dra2dba.cc: New file.
* src/dstarparse/dstar2tgba.cc: New file.
* src/dstarparse/Makefile.am: Add them.
* src/dstarparse/nra2nba.cc (nra_to_nba): Adjust so
that dra_to_dba() can call it using a masked automaton.
* src/dstarparse/public.hh (dra_to_dba, dstar_to_tgba): Declare.
* src/tgbatest/ltl2tgba.cc: Add an -XDD option.
* src/tgbatest/dstar.test: More tests.
This commit is contained in:
Alexandre Duret-Lutz 2013-08-16 17:01:44 +02:00
parent ce0aec604c
commit 9a7590a646
7 changed files with 516 additions and 23 deletions
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33
src/dstarparse/nra2nba.cc
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@ -35,14 +35,17 @@ namespace spot
class nra_to_nba_worker: public tgba_reachable_iterator_depth_first
{
public:
nra_to_nba_worker(const dstar_aut* a):
tgba_reachable_iterator_depth_first(a->aut),
out_(new tgba_explicit_number(a->aut->get_dict())),
// AUT is the automate we iterate on, while A is the automaton
// we read the acceptance conditions from. Separating the two
// makes its possible to mask AUT, as needed in dra_to_dba().
nra_to_nba_worker(const dstar_aut* a, const tgba* aut):
tgba_reachable_iterator_depth_first(aut),
out_(new tgba_explicit_number(aut->get_dict())),
d_(a),
num_states_(a->aut->num_states())
{
bdd_dict* bd = out_->get_dict();
bd->register_all_variables_of(a->aut, out_);
bd->register_all_variables_of(aut, out_);
// Invent a new acceptance set for the degeneralized automaton.
int accvar =
@ -113,16 +116,24 @@ namespace spot
}
// In dra_to_dba() we call this function with a second argument
// that is a masked version of nra->aut.
SPOT_LOCAL
tgba* nra_to_nba(const dstar_aut* nra, const tgba* aut)
{
assert(nra->type == Rabin);
nra_to_nba_worker w(nra, aut);
w.run();
tgba_explicit_number* res1 = w.result();
tgba* res2 = scc_filter_states(res1);
delete res1;
return res2;
}
SPOT_API
tgba* nra_to_nba(const dstar_aut* nra)
{
assert(nra->type == Rabin);
nra_to_nba_worker w(nra);
w.run();
tgba_explicit_number* aut = w.result();
tgba* res = scc_filter_states(aut);
delete aut;
return res;
return nra_to_nba(nra, nra->aut);
}
}