* src/tgbaalgos/dottydec.cc, src/tgbaalgos/dottydec.hh,

src/tgbaalgos/rundotdec.cc, src/tgbaalgos/rundotdec.hh: New files.
* src/tgbaalgos/Makefile.am (tgbaalgos_HEADERS,
libtgbaalgos_la_SOURCES): Add them.
* src/tgbaalgos/dotty.hh (dotty_reachable): Take a dotty_decorator
as third parameter.
* src/tgbaalgos/dotty.cc (dotty_bfs::process_state,
dotty_bfs::process_link): Use the decorator.
* src/tgbatest/ltl2tgba.cc: Graph the accepting run if the -g option
is given.
* src/tgbatest/emptchk.test: Exercize -g.

src/tgbaalgos/dottydec.hh

@@ -0,0 +1,87 @@
+// Copyright (C) 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_TGBAALGOS_DOTTYDEC_HH
+# define SPOT_TGBAALGOS_DOTTYDEC_HH
+
+#include <string>
+
+namespace spot
+{
+  class state;
+  class tgba;
+  class tgba_succ_iterator;
+
+  /// Choose state and link styles for spot::dotty_reachable.
+  class dotty_decorator
+  {
+  public:
+    virtual ~dotty_decorator();
+
+    /// \brief Compute the style of a state.
+    ///
+    /// This function should output a string of the form
+    /// <code>[label="foo", style=bar, ...]</code>.  The
+    /// default implementation will simply output <code>[label="LABEL"]</code>
+    /// with <code>LABEL</code> replaced by the value of \a label.
+    ///
+    /// \param a the automaton being drawn
+    /// \param s the state being drawn (owned by the caller)
+    /// \param n a unique number for this state
+    /// \param si an iterator over the successors of this state (owned by the
+    ///           caller, but can be freely iterated)
+    /// \param label the computed name of this state
+    virtual std::string state_decl(const tgba* a, const state* s, int n,
+				   tgba_succ_iterator* si,
+				   const std::string& label);
+
+    /// \brief Compute the style of a link.
+    ///
+    /// This function should output a string of the form
+    /// <code>[label="foo", style=bar, ...]</code>.  The
+    /// default implementation will simply output <code>[label="LABEL"]</code>
+    /// with <code>LABEL</code> replaced by the value of \a label.
+    ///
+    /// \param a the automaton being drawn
+    /// \param in_s the source state of the transition being drawn
+    ///             (owned by the caller)
+    /// \param in the unique number associated to \a in_s
+    /// \param out_s the destination state of the transition being drawn
+    ///             (owned by the caller)
+    /// \param out the unique number associated to \a out_s
+    /// \param si an iterator over the successors of \a in_s, pointing to
+    ///          the current transition (owned by the caller and cannot
+    ///        be iterated)
+    /// \param label the computed name of this state
+    virtual std::string link_decl(const tgba* a,
+				  const state* in_s, int in,
+				  const state* out_s, int out,
+				  const tgba_succ_iterator* si,
+				  const std::string& label);
+
+    /// Get the unique instance of the default dotty_decorator.
+    static dotty_decorator* instance();
+  protected:
+    dotty_decorator();
+  };
+}
+
+#endif // SPOT_TGBAALGOS_DOTTYDEC_HH