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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              P R J . E X T                               --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2000-2009, 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.      --

--                                                                          --

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--  Subprograms to set, get and cache external references, to be used as

--  External functions in project files.

with Prj.Tree;

package Prj.Ext is

   ------------------

   -- Project Path --

   ------------------

   procedure Add_Search_Project_Directory

     (Tree : Prj.Tree.Project_Node_Tree_Ref;

      Path : String);

   --  Add a directory to the project path. Directories added with this

   --  procedure are added in order after the current directory and before

   --  the path given by the environment variable GPR_PROJECT_PATH. A value

   --  of "-" will remove the default project directory from the project path.

   --

   --  Calls to this subprogram must be performed before the first call to

   --  Project_Path below, or PATH will be added at the end of the search

   --  path.

   function Project_Path (Tree : Prj.Tree.Project_Node_Tree_Ref) return String;

   --  Return the current value of the project path, either the value set

   --  during elaboration of the package or, if procedure Set_Project_Path has

   --  been called, the value set by the last call to Set_Project_Path.

   procedure Set_Project_Path

     (Tree     : Prj.Tree.Project_Node_Tree_Ref;

      New_Path : String);

   --  Give a new value to the project path. The new value New_Path should

   --  always start with the current directory (".") and the path separators

   --  should be the correct ones for the platform.

   -------------------------

   -- 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;