Preliminary support for Event-based GBA.

* src/evtgba/Makefile.am, src/evtgba/evtgba.cc,
src/evtgba/evtgba.hh, src/evtgba/evtgbaiter.hh,
src/evtgba/explicit.cc, src/evtgba/explicit.hh,
src/evtgba/product.cc, src/evtgba/product.hh,
src/evtgba/symbol.cc, src/evtgba/symbol.hh,
src/evtgbaalgos/Makefile.am, src/evtgbaalgos/dotty.cc,
src/evtgbaalgos/dotty.hh, src/evtgbaalgos/reachiter.cc,
src/evtgbaalgos/reachiter.hh, src/evtgbaalgos/save.cc,
src/evtgbaalgos/save.hh, src/evtgbaparse/Makefile.am,
src/evtgbaparse/evtgbaparse.yy, src/evtgbaparse/evtgbascan.ll,
src/evtgbaparse/fmterror.cc, src/evtgbaparse/parsedecl.hh,
src/evtgbaparse/public.hh, src/evtgbatest/Makefile.am,
src/evtgbatest/defs.in, src/evtgbatest/explicit.cc,
src/evtgbatest/explicit.test, src/evtgbatest/product.cc,
src/evtgbatest/product.test, src/evtgbatest/readsave.cc,
src/evtgbatest/readsave.test: New files.
* configure.ac: Create the Makefiles in these new subdirectories.
* src/Makefile.am: Recurse them.

src/evtgbaalgos/reachiter.hh

@@ -0,0 +1,121 @@
+// Copyright (C) 2003, 2004  Laboratoire d'Informatique de Paris 6 (LIP6),
+// département Systèmes Répartis Coopératifs (SRC), Université Pierre
+// et Marie Curie.
+//
+// This file is part of Spot, a model checking library.
+//
+// Spot is free software; you can redistribute it and/or modify it
+// under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// Spot is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+// or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+// License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Spot; see the file COPYING.  If not, write to the Free
+// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+
+#ifndef SPOT_EVTGBAALGOS_REACHITER_HH
+# define SPOT_EVTGBAALGOS_REACHITER_HH
+
+#include "misc/hash.hh"
+#include "evtgba/evtgba.hh"
+#include <stack>
+#include <deque>
+
+namespace spot
+{
+  /// \brief Iterate over all reachable states of a spot::evtgba.
+  class evtgba_reachable_iterator
+  {
+  public:
+    evtgba_reachable_iterator(const evtgba* a);
+    virtual ~evtgba_reachable_iterator();
+
+    /// \brief Iterate over all reachable states of a spot::evtgba.
+    ///
+    /// 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::evtgba_reachable_iterator_depth_first and
+    /// spot::evtgba_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;
+    /// \}
+
+    /// \brief Called by run() before starting its iteration.
+    ///
+    /// \param n The number of initial states.
+    virtual void start(int n);
+    /// 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::evtgba_iterator for \a s.
+    virtual void process_state(const state* s, int n, evtgba_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::evtgba_iterator positionned on the current
+    ///             transition.
+    virtual void process_link(int in, int out, const evtgba_iterator* si);
+
+  protected:
+    const evtgba* automata_;	///< The spot::evtgba to explore.
+
+    typedef Sgi::hash_map<const state*, int,
+			  state_ptr_hash, state_ptr_equal> seen_map;
+    seen_map seen;		///< States already seen.
+  };
+
+  /// \brief An implementation of spot::evtgba_reachable_iterator that browses
+  /// states depth first.
+  class evtgba_reachable_iterator_depth_first:
+    public evtgba_reachable_iterator
+  {
+  public:
+    evtgba_reachable_iterator_depth_first(const evtgba* a);
+
+    virtual void add_state(const state* s);
+    virtual const state* next_state();
+
+  protected:
+    std::stack<const state*> todo; ///< A stack of states yet to explore.
+  };
+
+  /// \brief An implementation of spot::evtgba_reachable_iterator that browses
+  /// states breadth first.
+  class evtgba_reachable_iterator_breadth_first:
+    public evtgba_reachable_iterator
+  {
+  public:
+    evtgba_reachable_iterator_breadth_first(const evtgba* a);
+
+    virtual void add_state(const state* s);
+    virtual const state* next_state();
+
+  protected:
+    std::deque<const state*> todo; ///< A queue of states yet to explore.
+  };
+
+
+}
+
+
+#endif // SPOT_EVTGBAALGOS_REACHITER_HH