-------------------------------------------------
-------------------------------
--                                                                          --
--                           OCARINA COMPONENTS                             --
--                                                                          --
--          O C A R I N A . E X P A N D E R . N A M E S P A C E S           --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--               Copyright (C) 2005-2007, GET-Telecom Paris.                --
--                                                                          --
-- Ocarina  is free software;  you  can  redistribute  it and/or  modify    --
-- it under terms of the GNU General Public License as published by the     --
-- Free Software Foundation; either version 2, or (at your option) any      --
-- later version. Ocarina 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 distributed with Ocarina; see file COPYING.   --
-- If not, write to the Free Software Foundation, 51 Franklin Street, Fifth --
-- Floor, Boston, MA 02111-1301, USA.                                       --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable to be   --
-- covered  by the  GNU  General  Public  License. This exception does not  --
-- however invalidate  any other reasons why the executable file might be   --
-- covered by the GNU Public License.                                       --
--                                                                          --
--                 Ocarina is maintained by the Ocarina team                --
--                       (ocarina-users@listes.enst.fr)                     --
--                                                                          --
------------------------------------------------------------------------------

with Locations;
with Ocarina.Nutils;
with Ocarina.Nodes;
with Ocarina.Entities;

package body Ocarina.Expander.Namespaces is

   use Locations;
   use Ocarina.Nutils;
   use Ocarina.Nodes;
   use Ocarina.Entities;

   ----------------------
   -- Expand_Namespace --
   ----------------------

   function Expand_Namespace
     (Instance_Root : node_id;
      Namespace     : node_id) return node_id
   is
      pragma assert (Kind (Instance_Root) = k_architecture_instance);
      pragma assert
        (Kind (Namespace) = k_package_specification
         or else Kind (Namespace) = k_aadl_specification);

      Namespace_Instance : node_id := No_Node;
   begin
      --  If the namespace has already been expanded, do not re-expand
      --  it and return the previously expanded value.

      if Kind (Namespace) = k_package_specification then
         Namespace_Instance :=
           Get_First_Homonym
             (Ocarina.Nodes.Namespaces (Instance_Root),
              Namespace);

         if No (Namespace_Instance) then
            Namespace_Instance := New_Node (k_namespace_instance, No_Location);
            Set_Declarations
              (Namespace_Instance,
               New_List (k_list_id, No_Location));
            Set_Identifier
              (Namespace_Instance,
               Duplicate_Identifier (Identifier (Namespace)));
            Set_Corresponding_Declaration (Namespace_Instance, Namespace);

            Append_Node_To_List
              (Namespace_Instance,
               Ocarina.Nodes.Namespaces (Instance_Root));
         end if;

      else
         Namespace_Instance := Unnamed_Namespace (Instance_Root);

         if No (Namespace_Instance) then
            Namespace_Instance := New_Node (k_namespace_instance, No_Location);
            Set_Unnamed_Namespace (Instance_Root, Namespace_Instance);
            Set_Declarations
              (Namespace_Instance,
               New_List (k_list_id, No_Location));
            Set_Identifier
              (Namespace_Instance,
               Make_Identifier (Loc (Namespace), No_Name, No_Name, Namespace));
            Set_Corresponding_Declaration (Namespace_Instance, Namespace);
         end if;
      end if;

      return Namespace_Instance;
   end Expand_Namespace;

end Ocarina.Expander.Namespaces;