* m4/gspnlib.m4: Define LIBGSPNESRG_LDFLAGS.

* iface/gspn/Makefile.am (gspn_HEADERS): Add common.hh.
(libspotgspn_la_SOURCES): Add common.cc.
(libspotgspneesrg_la_LIBADD, libspotgspneesrg_la_CPPFLAGS)
(libspotgspneesrg_la_SOURCES, ltlgspn_eesrg_SOURCES)
(dotty_eesrg_LDADD, dotty_eesrg_CPPFLAGS): New variables.
(lib_LTLIBRARIES): Add libspotgspneesrg.la.
(check_PROGRAMS): Add dottygspn-eesrg.
* iface/gspn/gspn.hh, iface/gspn/gspn.cc
(gspn_exeption, operator<<(gspn_exeption), gspn_environment): Move ...
* iface/gspn/common.hh, iface/gspn/common.cc: ... in these new files.
* iface/gspn/eesrg.hh, iface/gspn/eesrg.cc, iface/gspn/dottyeesrg.cc:
New files.

iface/gspn/common.hh

@@ -0,0 +1,70 @@
+#ifndef SPOT_IFACE_GSPN_COMMON_HH
+# define SPOT_IFACE_GSPN_COMMON_HH
+
+# include <string>
+# include <iostream>
+# include "ltlast/atomic_prop.hh"
+# include "ltlenv/environment.hh"
+
+
+// Do not include gspnlib.h here, or it will polute the user's
+// namespace with internal C symbols.
+
+namespace spot
+{
+
+  /// An exeption used to forward GSPN errors.
+  class gspn_exeption
+  {
+  public:
+    gspn_exeption(const std::string& where, int err)
+      : err_(err), where_(where)
+    {
+    }
+
+    int
+    get_err() const
+    {
+      return err_;
+    }
+
+    std::string
+    get_where() const
+    {
+      return where_;
+    }
+
+  private:
+    int err_;
+    std::string where_;
+  };
+
+  std::ostream& operator<<(std::ostream& os, const gspn_exeption& e);
+
+  class gspn_environment : public ltl::environment
+  {
+  public:
+    gspn_environment();
+    ~gspn_environment();
+
+    /// Declare an atomic proposition.  Return false iff the
+    /// proposition was already declared.
+    bool declare(const std::string& prop_str);
+
+    virtual ltl::formula* require(const std::string& prop_str);
+
+    /// Get the name of the environment.
+    virtual const std::string& name();
+
+    typedef std::map<const std::string, ltl::atomic_prop*> prop_map;
+
+    /// Get the map of atomic proposition known to this environment.
+    const prop_map& get_prop_map() const;
+
+  private:
+    prop_map props_;
+  };
+
+}
+
+#endif // SPOT_IFACE_GSPN_COMMON_HH