Replace spot::ltl_file by a rewritten spot::ltl::ltl_file.

* src/tgba/tgbafromfile.cc, src/tgba/tgbafromfile.hh: Delete these
files.
* src/tgba/Makefile.am: Remove them.
* src/ltl/ltlparse/ltlfile.hh, src/ltl/ltlparse/ltlfile.cc: New
files.
* src/ltl/ltlparse/Makefile.am: Add them.
* bench/scc-stats/stats.cc, bench/split-product/cutscc.cc: Rewrite
using the new class.

src/ltlparse/Makefile.am

@@ -1,4 +1,4 @@
-## Copyright (C) 2008, 2009 Laboratoire de Recherche et Développement
+## Copyright (C) 2008, 2009, 2010 Laboratoire de Recherche et Développement
 ## de l'Epita (LRDE).
 ## Copyright (C) 2003, 2004 Laboratoire d'Informatique de Paris
 ## 6 (LIP6), département Systèmes Répartis Coopératifs (SRC),
@@ -56,10 +56,12 @@ EXTRA_DIST = $(LTLPARSE_YY)
 libltlparse_la_SOURCES = \
   fmterror.cc \
   $(FROM_LTLPARSE_YY) \
+  ltlfile.cc \
   ltlscan.ll \
   parsedecl.hh
 
 ltlparse_HEADERS = \
-  public.hh \
+  ltlfile.hh \
   location.hh \
+  public.hh \
   position.hh

src/ltlparse/ltlfile.cc

@@ -0,0 +1,71 @@
+// Copyright (C) 2010 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
+//
+// 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.
+
+#include "ltlfile.hh"
+#include "public.hh"
+
+namespace spot
+{
+  namespace ltl
+  {
+
+    ltl_file::ltl_file(const std::string& filename)
+      : in(filename.c_str())
+    {
+      if (!in)
+	{
+	  std::cerr << "Cannot open " << filename << std::endl;
+	  exit(2);
+	}
+    }
+
+    ltl_file::ltl_file(const char* filename)
+      : in(filename)
+    {
+      if (!in)
+	{
+	  std::cerr << "Cannot open " << filename << std::endl;
+	  exit(2);
+	}
+    }
+
+    formula* ltl_file::next()
+    {
+      if (!in.good())
+	return 0;
+
+      std::string input;
+      do
+	{
+	  if (!std::getline(in, input))
+	    return 0;
+	}
+      while (input == "");
+
+      spot::ltl::parse_error_list pel;
+      formula* f = parse(input, pel);
+      int ret = spot::ltl::format_parse_errors(std::cerr, input, pel);
+      if (ret)
+	exit(ret);
+      return f;
+    }
+
+  }
+}

src/ltlparse/ltlfile.hh

@@ -0,0 +1,48 @@
+// Copyright (C) 2010 Laboratoire de Recherche et Développement
+// de l'Epita (LRDE).
+//
+// 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_LTLPARSE_LTLFILE_HH
+# define SPOT_LTLPARSE_LTLFILE_HH
+#include <fstream>
+#include "ltlast/formula.hh"
+
+
+namespace spot
+{
+  namespace ltl
+  {
+
+    /// \brief Read LTL formulae from a file, one by one
+    /// \ingroup ltl_io
+    class ltl_file
+    {
+    public:
+      ltl_file(const std::string& filename);
+      ltl_file(const char* filename);
+      /// Return the next parsed LTL formula, and 0 at end of file.
+      formula* next();
+    private:
+      std::ifstream in;
+    };
+
+  }
+}
+
+#endif