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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                              P R J . E X T                               --
--                                                                          --
--                                 S p e c                                  --
--                                                                          --
--          Copyright (C) 2000-2010, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT 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 GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

--  Subprograms to set, get and cache external references, to be used as
--  External functions in project files.

with Prj.Tree;

package Prj.Ext is

   -------------------------
   -- External References --
   -------------------------

   --  External references influence the way a project tree is processed (in
   --  particular they provide the values for the typed string variables that
   --  are then used in case constructions).

   --  External references are project-tree specific, so that when multiple
   --  trees are loaded in parallel we can have different scenarios (or even
   --  load the same tree twice and see different views of it).

   procedure Add
     (Tree          : Prj.Tree.Project_Node_Tree_Ref;
      External_Name : String;
      Value         : String);
   --  Add an external reference (or modify an existing one)

   function Value_Of
     (Tree          : Prj.Tree.Project_Node_Tree_Ref;
      External_Name : Name_Id;
      With_Default  : Name_Id := No_Name)
      return          Name_Id;
   --  Get the value of an external reference, and cache it for future uses

   function Check
     (Tree        : Prj.Tree.Project_Node_Tree_Ref;
      Declaration : String) return Boolean;
   --  Check that an external declaration <external>=<value> is correct.
   --  If it is correct, the external reference is Added.

   procedure Reset (Tree : Prj.Tree.Project_Node_Tree_Ref);
   --  Clear the internal data structure that stores the external references
   --  and free any allocated memory.

end Prj.Ext;