2b74398a62
* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS, libtgbaalgos_la_SOURCES): Add them. * src/tgbaalgos/gv04.cc (gv04::result::accepting_run): Use the new bfs_steps class.
100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
// Copyright (C) 2004 Laboratoire d'Informatique de Paris 6 (LIP6),
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// département Systèmes Répartis Coopératifs (SRC), Université Pierre
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// et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Spot; see the file COPYING. If not, write to the Free
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// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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// 02111-1307, USA.
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#include <map>
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#include <deque>
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#include "bfssteps.hh"
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#include "tgba/tgba.hh"
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namespace spot
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{
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bfs_steps::bfs_steps(const tgba* a)
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: a_(a)
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{
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}
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bfs_steps::~bfs_steps()
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{
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}
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const state*
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bfs_steps::search(const state* start, tgba_run::steps& l)
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{
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// Records backlinks to parent state during the BFS.
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// (This also stores the propositions of this link.)
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std::map<const state*, tgba_run::step,
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state_ptr_less_than> father;
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// BFS queue.
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std::deque<const state*> todo;
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// Initial state.
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todo.push_back(start);
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while (!todo.empty())
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{
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const state* src = todo.front();
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todo.pop_front();
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tgba_succ_iterator* i = a_->succ_iter(src);
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for (i->first(); !i->done(); i->next())
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{
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const state* dest = filter(i->current_state());
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if (!dest)
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continue;
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bdd cond = i->current_condition();
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bdd acc = i->current_acceptance_conditions();
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tgba_run::step s = { src, cond, acc };
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if (match(s, dest))
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{
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// Found it!
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tgba_run::steps p;
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for (;;)
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{
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tgba_run::step tmp = s;
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tmp.s = tmp.s->clone();
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p.push_front(tmp);
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if (s.s == start)
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break;
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s = father[s.s];
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}
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l.splice(l.end(), p);
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delete i;
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return dest;
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}
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// Common case: record backlinks and continue BFS
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// for unvisited states.
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if (father.find(dest) == father.end())
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{
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todo.push_back(dest);
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father[dest] = s;
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}
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}
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delete i;
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}
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return 0;
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}
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}
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