hoa: preliminary implementation of a parser

* src/hoaparse/Makefile.am, src/hoaparse/fmterror.cc,
src/hoaparse/hoaparse.yy, src/hoaparse/hoascan.ll,
src/hoaparse/parsedecl.hh, src/hoaparse/public.hh: New files.
* src/Makefile.am, configure.ac, README: Adjust.
* src/tgbatest/ltl2tgba.cc: Add a -XH option.
* src/tgbatest/hoaparse.test: New file.
* src/tgbatest/Makefile.am: Adjust.
* buddy/src/bddx.h: Add a bdd_from_int() function.

src/hoaparse/parsedecl.hh

@@ -0,0 +1,39 @@
+// -*- coding: utf-8 -*-
+// Copyright (C) 2014 Laboratoire de Recherche et Développement
+// de l'EPITA.
+//
+// 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 3 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+
+#ifndef SPOT_HOAPARSE_PARSEDECL_HH
+# define SPOT_HOAPARSE_PARSEDECL_HH
+
+#include <string>
+#include "hoaparse.hh"
+#include "misc/location.hh"
+
+# define YY_DECL \
+  int hoayylex(hoayy::parser::semantic_type *yylval, \
+	       spot::location *yylloc, \
+	       spot::hoa_parse_error_list& error_list)
+YY_DECL;
+
+namespace spot
+{
+  int hoayyopen(const std::string& name);
+  void hoayyclose();
+}
+
+#endif // SPOT_HOAPARSE_PARSEDECL_HH