* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS): Add reachiters.hh.

(libtgbaalgos_la_SOURCES): Add reachiters.cc.
* src/tgbaalgos/dotty.cc, src/tgbaalgos/save.cc: Rewrite using
spot::tgba_reachable_iterator_breadth_first.
* src/tgbatest/explicit.test, src/tgbatest/tgbaread.test,
src/tgbatest/tripprod.test: Adjust expected output.

ChangeLog

+2003-07-25  Alexandre Duret-Lutz  <aduret@src.lip6.fr>
+
+	* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS): Add reachiters.hh.
+	(libtgbaalgos_la_SOURCES): Add reachiters.cc.
+	* src/tgbaalgos/dotty.cc, src/tgbaalgos/save.cc: Rewrite using 
+	spot::tgba_reachable_iterator_breadth_first.
+	* src/tgbatest/explicit.test, src/tgbatest/tgbaread.test,
+	src/tgbatest/tripprod.test: Adjust expected output.
+
 2003-07-24  Alexandre Duret-Lutz  <aduret@src.lip6.fr>
 
 	* configure.ac: Output iface/gspn/defs.
 	* iface/gspn/Makefile.am (EXTRA_DIST): Add $(TESTS).
 	(TESTS, check_SCRIPTS, distclean-local): New.
-	* iface/gspn/dcswave.test, iface/gspn/simple.test, 
+	* iface/gspn/dcswave.test, iface/gspn/simple.test,
 	iface/gspn/defs.in: New files.
 	* iface/gspn/dottygspn.cc (main): Take the list of properties
 	of interest in argument.

src/tgbaalgos/Makefile.am

@@ -4,6 +4,7 @@ AM_CXXFLAGS = $(WARNING_CXXFLAGS)
 tgbaalgosdir = $(pkgincludedir)/tgbaalgos
 
 tgbaalgos_HEADERS = \
+  reachiter.hh \
   dotty.hh \
   lbtt.hh \
   ltl2tgba.hh \
@@ -11,6 +12,7 @@ tgbaalgos_HEADERS = \
 
 noinst_LTLIBRARIES = libtgbaalgos.la
 libtgbaalgos_la_SOURCES = \
+  reachiter.cc \
   dotty.cc \
   lbtt.cc \
   ltl2tgba.cc \

src/tgbaalgos/dotty.cc

-#include <map>
 #include "tgba/tgba.hh"
 #include "dotty.hh"
 #include "tgba/bddprint.hh"
+#include "reachiter.hh"
 
 namespace spot
 {
-  typedef std::map<state*, int, state_ptr_less_than> seen_map;
 
-  /// Output and record a state.
-  static bool
-  dotty_state(std::ostream& os,
-	      const tgba* g, state* st, seen_map& m, int& node)
+  class dotty_bfs : public tgba_reachable_iterator_breadth_first
   {
-    seen_map::iterator i = m.find(st);
-
-    // Already drawn?
-    if (i != m.end())
-      {
-	node = i->second;
-	return false;
-      }
-
-    node = m.size() + 1;
-    m[st] = node;
-
-    os << "  " << node << " [label=\""
-       << g->format_state(st) << "\"]" << std::endl;
-    return true;
-  }
-
-  /// Process successors.
-  static void
-  dotty_rec(std::ostream& os,
-	    const tgba* g, state* st, seen_map& m, int father)
-  {
-    tgba_succ_iterator* si = g->succ_iter(st);
-    for (si->first(); !si->done(); si->next())
-      {
-	int node;
-	state* s = si->current_state();
-	bool recurse = dotty_state(os, g, s, m, node);
-	os << "  " << father << " -> " << node << " [label=\"";
-	bdd_print_set(os, g->get_dict(), si->current_condition()) << "\\n";
-	bdd_print_set(os, g->get_dict(), si->current_accepting_conditions())
-	  << "\"]" << std::endl;
-	if (recurse)
-	  {
-	    dotty_rec(os, g, s, m, node);
-	    // Do not delete S, it is used as key in M.
-	  }
-	else
-	  {
-	    delete s;
-	  }
-      }
-    delete si;
-  }
+  public:
+    dotty_bfs(const tgba* a, std::ostream& os)
+      : tgba_reachable_iterator_breadth_first(a), os_(os)
+    {
+    }
+
+    void
+    start()
+    {
+      os_ << "digraph G {" << std::endl;
+      os_ << "  size=\"7.26,10.69\"" << std::endl;
+      os_ << "  0 [label=\"\", style=invis]" << std::endl;
+      os_ << "  0 -> 1" << std::endl;
+    }
+
+    void
+    end()
+    {
+      os_ << "}" << std::endl;
+    }
+
+    void
+    process_state(const state* s, int n, tgba_succ_iterator*)
+    {
+      os_ << "  " << n << " [label=\""
+	  << automata_->format_state(s) << "\"]" << std::endl;
+    }
+
+    void
+    process_link(int in, int out, const tgba_succ_iterator* si)
+    {
+      os_ << "  " << in << " -> " << out << " [label=\"";
+      bdd_print_set(os_, automata_->get_dict(),
+		    si->current_condition()) << "\\n";
+      bdd_print_set(os_, automata_->get_dict(),
+		    si->current_accepting_conditions()) << "\"]" << std::endl;
+    }
+
+  private:
+    std::ostream& os_;
+  };
 
   std::ostream&
   dotty_reachable(std::ostream& os, const tgba* g)
   {
-    seen_map m;
-    state* state = g->get_init_state();
-    os << "digraph G {" << std::endl;
-    os << "  size=\"7.26,10.69\"" << std::endl;
-    os << "  0 [label=\"\", style=invis]" << std::endl;
-    int init;
-    dotty_state(os, g, state, m, init);
-    os << "  0 -> " << init << std::endl;
-    dotty_rec(os, g, state, m, init);
-    os << "}" << std::endl;
-
-    // Finally delete all states used as keys in m:
-    for (seen_map::iterator i = m.begin(); i != m.end(); ++i)
-      delete i->first;
-
+    dotty_bfs d(g, os);
+    d.run();
     return os;
   }
 

src/tgbaalgos/reachiter.cc

+#include "reachiter.hh"
+
+namespace spot
+{
+  // tgba_reachable_iterator
+  //////////////////////////////////////////////////////////////////////
+
+  tgba_reachable_iterator::tgba_reachable_iterator(const tgba* a)
+    : automata_(a)
+  {
+  }
+
+  tgba_reachable_iterator::~tgba_reachable_iterator()
+  {
+    for (seen_map::const_iterator s = seen.begin(); s != seen.end(); ++s)
+      delete s->first;
+  }
+
+  void
+  tgba_reachable_iterator::run()
+  {
+    int n = 0;
+    start();
+    state* i = automata_->get_init_state();
+    add_state(i);
+    seen[i] = ++n;
+    const state* t;
+    while ((t = next_state()))
+      {
+	assert(seen.find(t) != seen.end());
+	int tn = seen[t];
+	tgba_succ_iterator* si = automata_->succ_iter(t);
+	process_state(t, tn, si);
+	for (si->first(); ! si->done(); si->next())
+	  {
+	    const state* current = si->current_state();
+	    seen_map::const_iterator s = seen.find(current);
+	    if (s == seen.end())
+	      {
+		seen[current] = ++n;
+		add_state(current);
+		process_link(tn, n, si);
+	      }
+	    else
+	      {
+		process_link(tn, seen[current], si);
+		delete current;
+	      }
+	  }
+	delete si;
+      }
+    end();
+  }
+
+  void
+  tgba_reachable_iterator::start()
+  {
+  }
+
+  void
+  tgba_reachable_iterator::end()
+  {
+  }
+
+  void
+  tgba_reachable_iterator::process_state(const state*, int,
+					 tgba_succ_iterator*)
+  {
+  }
+
+  void
+  tgba_reachable_iterator::process_link(int, int, const tgba_succ_iterator*)
+  {
+  }
+
+  // tgba_reachable_iterator_depth_first
+  //////////////////////////////////////////////////////////////////////
+
+  tgba_reachable_iterator_depth_first::
+    tgba_reachable_iterator_depth_first(const tgba* a)
+      : tgba_reachable_iterator(a)
+  {
+  }
+
+  void
+  tgba_reachable_iterator_depth_first::add_state(const state* s)
+  {
+    todo.push(s);
+  }
+
+  const state*
+  tgba_reachable_iterator_depth_first::next_state()
+  {
+    if (todo.empty())
+      return 0;
+    const state* s = todo.top();
+    todo.pop();
+    return s;
+  }
+
+  // tgba_reachable_iterator_breadth_first
+  //////////////////////////////////////////////////////////////////////
+
+  tgba_reachable_iterator_breadth_first::
+    tgba_reachable_iterator_breadth_first(const tgba* a)
+      : tgba_reachable_iterator(a)
+  {
+  }
+
+  void
+  tgba_reachable_iterator_breadth_first::add_state(const state* s)
+  {
+    todo.push_back(s);
+  }
+
+  const state*
+  tgba_reachable_iterator_breadth_first::next_state()
+  {
+    if (todo.empty())
+      return 0;
+    const state* s = todo.front();
+    todo.pop_front();
+    return s;
+  }
+
+}

src/tgbaalgos/reachiter.hh

+#ifndef SPOT_TGBAALGOS_REACHITER_HH
+# define SPOT_TGBAALGOS_REACHITER_HH
+
+#include "tgba/tgba.hh"
+#include <stack>
+#include <deque>
+
+namespace spot
+{
+  /// \brief Iterate over all reachable states of a spot::tgba.
+  class tgba_reachable_iterator
+  {
+  public:
+    tgba_reachable_iterator(const tgba* a);
+    virtual ~tgba_reachable_iterator();
+
+    /// \brief Iterate over all reachable states of a spot::tgba.
+    ///
+    /// This is a template method that will call add_state(), next_state(),
+    /// start(), end(), process_state(), and process_link(), while it
+    /// iterate over state.
+    void run();
+
+    /// \name Todo list management.
+    ///
+    /// spot::tgba_reachable_iterator_depth_first and
+    /// spot::tgba_reachable_iterator_breadth_first offer two precanned
+    /// implementations for these functions.
+    /// \{
+    /// \brief Called by run() to register newly discovered states.
+    virtual void add_state(const state* s) = 0;
+    /// \brief Called by run() to obtain the
+    virtual const state* next_state() = 0;
+    /// \}
+
+    /// Called by run() before starting its iteration.
+    virtual void start();
+    /// Called by run() once all states have been explored.
+    virtual void end();
+
+    /// Called by run() to process a state.
+    ///
+    /// \param s The current state.
+    /// \param n An unique number assigned to \a s.
+    /// \param si The spot::tgba_succ_iterator for \a s.
+    virtual void process_state(const state* s, int n, tgba_succ_iterator* si);
+    /// Called by run() to process a transition.
+    ///
+    /// \param in The source state number.
+    /// \param out The destination state number.
+    /// \param si The spot::tgba_succ_iterator positionned on the current
+    ///             transition.
+    virtual void process_link(int in, int out, const tgba_succ_iterator* si);
+
+  protected:
+    const tgba* automata_;	///< The spot::tgba to explore.
+
+    typedef std::map<const state*, int, state_ptr_less_than> seen_map;
+    seen_map seen;		///< States already seen.
+  };
+
+  /// \brief An implementation of spot::tgba_reachable_iterator that browses
+  /// states depth first.
+  class tgba_reachable_iterator_depth_first : public tgba_reachable_iterator
+  {
+  public:
+    tgba_reachable_iterator_depth_first(const tgba* a);
+
+    virtual void add_state(const state* s);
+    virtual const state* next_state();
+
+  protected:
+    std::stack<const state*> todo; ///< A stack of state yet to explore.
+  };
+
+  /// \brief An implementation of spot::tgba_reachable_iterator that browses
+  /// states breadth first.
+  class tgba_reachable_iterator_breadth_first : public tgba_reachable_iterator
+  {
+  public:
+    tgba_reachable_iterator_breadth_first(const tgba* a);
+
+    virtual void add_state(const state* s);
+    virtual const state* next_state();
+
+  protected:
+    std::deque<const state*> todo; ///< A queue of state yet to explore.
+  };
+
+
+}
+
+
+#endif // SPOT_TGBAALGOS_REACHITER_HH

src/tgbaalgos/save.cc

-#include <set>
 #include "tgba/tgba.hh"
 #include "save.hh"
 #include "tgba/bddprint.hh"
 #include "ltlvisit/tostring.hh"
+#include "reachiter.hh"
 
 namespace spot
 {
-  typedef std::set<state*, state_ptr_less_than> seen_set;
 
-  /// Process successors.
-  static void
-  save_rec(std::ostream& os, const tgba* g, state* st, seen_set& m)
+  class save_bfs : public tgba_reachable_iterator_breadth_first
   {
-    m.insert(st);
-    std::string cur = g->format_state(st);
-    tgba_succ_iterator* si = g->succ_iter(st);
-    for (si->first(); !si->done(); si->next())
-      {
-	state* s = si->current_state();
-	os << "\"" << cur << "\", \"" << g->format_state(s) << "\", ";
+  public:
+    save_bfs(const tgba* a, std::ostream& os)
+      : tgba_reachable_iterator_breadth_first(a), os_(os)
+    {
+    }
 
-	bdd_print_sat(os, g->get_dict(), si->current_condition()) << ",";
-	bdd_print_acc(os, g->get_dict(), si->current_accepting_conditions())
-	  << ";" << std::endl;
+    void
+    start()
+    {
+      const bdd_dict* d = automata_->get_dict();
+      os_ << "acc =";
+      for (bdd_dict::fv_map::const_iterator ai = d->acc_map.begin();
+	   ai != d->acc_map.end(); ++ai)
+	{
+	  os_ << " \"";
+	  ltl::to_string(ai->first, os_) << "\"";
+	}
+      os_ << ";" << std::endl;
+    }
+
+    void
+    process_state(const state* s, int, tgba_succ_iterator* si)
+    {
+      const bdd_dict* d = automata_->get_dict();
+      std::string cur = automata_->format_state(s);
+      for (si->first(); !si->done(); si->next())
+	{
+	  state* dest = si->current_state();
+	  os_ << "\"" << cur << "\", \"" 
+	      << automata_->format_state(dest) << "\", ";
+	  bdd_print_sat(os_, d, si->current_condition()) << ",";
+	  bdd_print_acc(os_, d, si->current_accepting_conditions());
+	  os_ << ";" << std::endl;
+	}
+    }
+
+  private:
+    std::ostream& os_;
+  };
 
-	// Destination already explored?
-	seen_set::iterator i = m.find(s);
-	if (i != m.end())
-	  {
-	    delete s;
-	  }
-	else
-	  {
-	    save_rec(os, g, s, m);
-	    // Do not delete S, it is used as key in M.
-	  }
-      }
-    delete si;
-  }
 
   std::ostream&
   tgba_save_reachable(std::ostream& os, const tgba* g)
   {
-    const bdd_dict* d = g->get_dict();
-    os << "acc =";
-    for (bdd_dict::fv_map::const_iterator ai = d->acc_map.begin();
-	 ai != d->acc_map.end(); ++ai)
-      {
-	os << " \"";
-	ltl::to_string(ai->first, os) << "\"";
-      }
-    os << ";" << std::endl;
-
-    seen_set m;
-    state* state = g->get_init_state();
-    save_rec(os, g, state, m);
-    // Finally delete all states used as keys in m:
-    for (seen_set::iterator i = m.begin(); i != m.end(); ++i)
-      delete *i;
+    save_bfs b(g, os);
+    b.run();
     return os;
   }
 }

src/tgbatest/explicit.test

@@ -10,12 +10,12 @@ cat >expected <<EOF
 digraph G {
   size="7.26,10.69"
   0 [label="", style=invis]
-  1 [label="state 0"]
   0 -> 1
-  2 [label="state 1"]
+  1 [label="state 0"]
   1 -> 2 [label="T\n<Acc[p]:0, Acc[q]:1, Acc[r]:0><Acc[p]:1, Acc[q]:0, Acc[r]:0>"]
-  3 [label="state 2"]
+  2 [label="state 1"]
   2 -> 3 [label="<a:1>\n<Acc[p]:0, Acc[q]:0, Acc[r]:1>"]
+  3 [label="state 2"]
   3 -> 1 [label="<b:1, c:1>\nF"]
 }
 EOF

src/tgbatest/tgbaread.test

@@ -17,12 +17,12 @@ cat >expected <<EOF
 digraph G {
   size="7.26,10.69"
   0 [label="", style=invis]
-  1 [label="s1"]
   0 -> 1
-  2 [label="s2"]
+  1 [label="s1"]
   1 -> 2 [label="<a:1, b:0>\n<Acc[c]:0, Acc[d]:1><Acc[c]:1, Acc[d]:0>"]
-  3 [label="state 3"]
+  2 [label="s2"]
   2 -> 3 [label="<a:1>\n<Acc[c]:1, Acc[d]:0>"]
+  3 [label="state 3"]
   3 -> 1 [label="T\nF"]
 }
 EOF

src/tgbatest/tripprod.test

@@ -30,9 +30,9 @@ cat >expected <<EOF
 acc = "p1" "p2" "p3" "p4";
 "s1 * s1 * s1", "s3 * s2 * s2", a b, "p1" "p2";
 "s1 * s1 * s1", "s2 * s2 * s2", a b, "p1" "p2";
-"s2 * s2 * s2", "s3 * s1 * s3", a c, "p3" "p4";
 "s1 * s1 * s1", "s3 * s2 * s3", a b, "p1" "p2";
 "s1 * s1 * s1", "s2 * s2 * s3", b, "p1" "p2";
+"s2 * s2 * s2", "s3 * s1 * s3", a c, "p3" "p4";
 "s2 * s2 * s3", "s3 * s1 * s2", a c, "p3" "p4";
 EOF