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scc_info: determine accepting/rejecting-SCCs for any acceptance

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* src/twaalgos/sccinfo.cc, src/twaalgos/sccinfo.hh
(determine_unknown_acceptance): New function to call explicitly
in case one want to know whether the accepting/rejecting status
of all SCCs regardless of the acceptance.
* src/twaalgos/dotty.cc src/twaalgos/sccfilter.cc,
src/twaalgos/sccfilter.hh: Use it.
* src/tests/unambig.test, src/tests/sccdot.test: Add more tests.
* doc/org/oaut.org: Adjust doc for --dot=s, orange is not output
anymore.
This commit is contained in:
Alexandre Duret-Lutz 2015-05-13 23:16:26 +02:00
parent 07ee3d2dd0
commit 8c32fba8b9
8 changed files with 148 additions and 20 deletions
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31
src/twaalgos/sccinfo.cc
View file

@ -22,6 +22,7 @@
#include <algorithm>
#include <queue>
#include "twa/bddprint.hh"
#include "twaalgos/mask.hh"
#include "misc/escape.hh"
namespace spot
@ -225,16 +226,23 @@ namespace spot
root_.front().node.trivial_ = false;
}
determine_usefulness();
}
void scc_info::determine_usefulness()
{
// An SCC is useful if it is not rejecting or it has a successor
// SCC that is useful.
unsigned scccount = scc_count();
for (unsigned i = 0; i < scccount; ++i)
{
if (!node_[i].is_rejecting())
{
node_[i].useful_ = true;
continue;
}
node_[i].useful_ = false;
for (auto j: node_[i].succ())
if (node_[j.dst].is_useful())
{
@ -295,6 +303,29 @@ namespace spot
return support;
}
void scc_info::determine_unknown_acceptance()
{
std::vector<bool> k;
unsigned n = scc_count();
bool changed = false;
for (unsigned s = 0; s < n; ++s)
if (!is_rejecting_scc(s) && !is_accepting_scc(s))
{
auto& node = node_[s];
if (k.empty())
k.resize(aut_->num_states());
for (auto i: node.states_)
k[i] = true;
if (mask_keep_states(aut_, k, node.states_.front())->is_empty())
node.rejecting_ = true;
else
node.accepting_ = true;
changed = true;
}
if (changed)
determine_usefulness();
}
std::ostream&
dump_scc_info_dot(std::ostream& out,
const_twa_graph_ptr aut, scc_info* sccinfo)