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minimize_obligation: can complement the input TGBA if deterministic

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This makes dstar2tgba able to produce a minimal WDBA when the input DRA
represent an obligation property.

* src/tgbaalgos/minimize.cc (minimize_obligation): When the
formula is not supplied but the input automaton is deterministic,
complement it to check the result of WDBA minimization.
* src/tgbatest/ltl2dstar.test, src/tgbatest/ltl2dstar2.test: Improve
tests.
This commit is contained in:
Alexandre Duret-Lutz 2013-08-18 00:58:01 +02:00
parent 3b10bb3b8c
commit 2dda2c9122
3 changed files with 53 additions and 41 deletions
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44
src/tgbaalgos/minimize.cc
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@ -46,6 +46,8 @@
#include "tgbaalgos/scc.hh"
#include "tgbaalgos/ltl2tgba_fm.hh"
#include "tgbaalgos/bfssteps.hh"
#include "tgbaalgos/isdet.hh"
#include "tgbaalgos/dbacomp.hh"
#include "priv/countstates.hh"
namespace spot
@ -647,29 +649,37 @@ namespace spot
if (is_guarantee_automaton(aut_f))
return min_aut_f;
if (!f && !aut_neg_f)
{
// We do not now if the minimization is safe.
delete min_aut_f;
return 0;
}
const tgba* to_free = 0;
// Build negation automaton if not supplied.
if (!aut_neg_f)
{
assert(f);
if (f)
{
// If we know the formula, simply build the automaton for
// its negation.
const ltl::formula* neg_f =
ltl::unop::instance(ltl::unop::Not, f->clone());
aut_neg_f = ltl_to_tgba_fm(neg_f, aut_f->get_dict());
neg_f->destroy();
const ltl::formula* neg_f =
ltl::unop::instance(ltl::unop::Not, f->clone());
aut_neg_f = ltl_to_tgba_fm(neg_f, aut_f->get_dict());
neg_f->destroy();
// Remove useless SCCs.
const tgba* tmp = scc_filter(aut_neg_f, true);
delete aut_neg_f;
to_free = aut_neg_f = tmp;
// Remove useless SCCs.
const tgba* tmp = scc_filter(aut_neg_f, true);
delete aut_neg_f;
to_free = aut_neg_f = tmp;
}
else if (is_deterministic(aut_f))
{
// If the automaton is deterministic, complementing is
// easy.
to_free = aut_neg_f = dba_complement(aut_f);
}
else
{
// Otherwise, we cannot check if the minimization is safe.
delete min_aut_f;
return 0;
}
}
// If the negation is a guarantee automaton, then the