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implement scc_filter_states for tgba_digraph

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* src/tgbaalgos/sccfilter.cc,
src/tgbaalgos/sccfilter.hh (scc_filter_states): New overload taking
a tgba_digraph and some scc_info.
This commit is contained in:
Alexandre Duret-Lutz 2014-05-21 14:53:03 +02:00
parent 9903ae2fa8
commit 9909699c63
2 changed files with 64 additions and 3 deletions
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53
src/tgbaalgos/sccfilter.cc
View file

@ -17,10 +17,11 @@
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "sccfilter.hh"
#include "tgba/tgbaexplicit.hh"
#include "sccfilter.hh"
#include "reachiter.hh"
#include "tgbaalgos/scc.hh"
#include "tgbaalgos/sccinfo.hh"
namespace spot
{
@ -555,6 +556,10 @@ namespace spot
tgba* scc_filter_states(const tgba* aut, scc_map* given_sm)
{
const tgba_digraph* autg = dynamic_cast<const tgba_digraph*>(aut);
if (autg && !given_sm)
return scc_filter_states(autg, nullptr);
scc_map* sm = given_sm;
if (!sm)
{
@ -604,4 +609,50 @@ namespace spot
return ret;
}
tgba_digraph* scc_filter_states(const tgba_digraph* aut, scc_info* given_si)
{
// Compute scc_info if not supplied.
scc_info* si = given_si;
if (!si)
si = new scc_info(aut);
// Renumber all useful states.
unsigned in_n = aut->num_states(); // Number of input states.
unsigned out_n = 0; // Number of output states.
std::vector<unsigned> inout; // Associate old states to new ones.
inout.reserve(in_n);
for (unsigned i = 0; i < in_n; ++i)
if (si->is_useful_state(i))
inout.push_back(out_n++);
else
inout.push_back(-1U);
// scc_info is not useful anymore.
if (!given_si)
delete si;
bdd_dict* bd = aut->get_dict();
tgba_digraph* filtered = new tgba_digraph(bd);
bd->register_all_variables_of(aut, filtered);
filtered->copy_acceptance_conditions_of(aut);
const tgba_digraph::graph_t& ing = aut->get_graph();
tgba_digraph::graph_t& outg = filtered->get_graph();
outg.new_states(out_n);
for (unsigned isrc = 0; isrc < in_n; ++isrc)
{
unsigned osrc = inout[isrc];
if (osrc >= out_n)
continue;
for (auto& t: ing.out(isrc))
{
unsigned odst = inout[t.dst];
if (odst >= out_n)
continue;
outg.new_transition(osrc, odst, t.cond, t.acc);
}
}
filtered->set_init_state(aut->get_init_state_number());
return filtered;
}
}

14
src/tgbaalgos/sccfilter.hh
View file

@ -1,5 +1,5 @@
// -*- coding: utf-8 -*-
// Copyright (C) 2009, 2010, 2012, 2013 Laboratoire de Recherche et
// Copyright (C) 2009, 2010, 2012, 2013, 2014 Laboratoire de Recherche et
// Developpement de l'Epita (LRDE).
//
// This file is part of Spot, a model checking library.
@ -20,11 +20,16 @@
#ifndef SPOT_TGBAALGOS_SCCFILTER_HH
# define SPOT_TGBAALGOS_SCCFILTER_HH
#include "tgba/tgba.hh"
#include "misc/common.hh"
#include <bdd.h>
namespace spot
{
class scc_map;
class tgba;
class tgba_digraph;
class scc_info;
/// \brief Prune unaccepting SCCs and remove superfluous acceptance
/// conditions.
@ -75,8 +80,13 @@ namespace spot
/// Especially, if the input TGBA has the SBA property, (i.e.,
/// transitions leaving accepting states are all marked as
/// accepting), then the output TGBA will also have that property.
/// @{
SPOT_API tgba*
scc_filter_states(const tgba* aut, scc_map* given_sm = 0);
SPOT_API tgba_digraph*
scc_filter_states(const tgba_digraph* aut, scc_info* given_si = 0);
/// @}
}
#endif // SPOT_TGBAALGOS_SCC_HH