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twa: add support for very-weak property

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* spot/twa/twa.hh: Implement the property.
* spot/parseaut/parseaut.yy, spot/twaalgos/hoa.cc: Add input
and output for it.
* spot/twaalgos/strength.cc,
spot/twaalgos/strength.hh (is_very_weak_automaton): New function.
* tests/core/alternating.test: Add a test for --check=strength
on an alternating automaton.
* tests/core/strength.test, tests/core/parseaut.test: Adjust expected
output.
* NEWS, doc/org/hoa.org, doc/org/concepts.org: Document it.
This commit is contained in:
Alexandre Duret-Lutz 2016-12-01 18:27:54 +01:00
parent a4ce999402
commit 582d455c23
11 changed files with 146 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

28
spot/twaalgos/strength.cc
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@ -34,22 +34,29 @@ namespace spot
bool need_si = !si;
if (need_si)
si = new scc_info(aut);
si->determine_unknown_acceptance();
if (inweak)
si->determine_unknown_acceptance();
bool is_inweak = true;
bool is_weak = true;
bool is_single_state_scc = true;
bool is_term = true;
unsigned n = si->scc_count();
for (unsigned i = 0; i < n; ++i)
{
if (si->is_trivial(i))
continue;
if (si->states_of(i).size() > 1)
is_single_state_scc = false;
bool first = true;
acc_cond::mark_t m = 0U;
if (is_weak)
for (auto src: si->states_of(i))
for (auto& t: aut->out(src))
if (si->scc_of(t.dst) == i)
// In case of a universal edge we only need to check
// the first destination of an inside the SCC, because
// the other have the same t.acc.
if (si->scc_of(*aut->univ_dests(t.dst).begin()) == i)
{
if (first)
{
@ -98,6 +105,7 @@ namespace spot
if (terminal)
aut->prop_terminal(is_term && is_weak);
aut->prop_weak(is_weak);
aut->prop_very_weak(is_single_state_scc && is_weak);
if (inweak)
aut->prop_inherently_weak(is_inweak);
}
@ -131,6 +139,17 @@ namespace spot
return res;
}
bool
is_very_weak_automaton(const const_twa_graph_ptr& aut, scc_info* si)
{
trival v = aut->prop_very_weak();
if (v.is_known())
return v.is_true();
is_type_automaton<false, false, true>
(std::const_pointer_cast<twa_graph>(aut), si);
return aut->prop_very_weak().is_true();
}
bool
is_inherently_weak_automaton(const const_twa_graph_ptr& aut, scc_info* si)
{
@ -145,7 +164,10 @@ namespace spot
void check_strength(const twa_graph_ptr& aut, scc_info* si)
{
is_type_automaton<true, true, true>(aut, si);
if (aut->is_alternating())
is_type_automaton<false, false, true>(aut, si);
else
is_type_automaton<true, true, true>(aut, si);
}
bool is_safety_mwdba(const const_twa_graph_ptr& aut)