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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                             M L I B . F I L                              --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--                     Copyright (C) 2001-2007, AdaCore                     --
--                                                                          --
-- 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.      --
--                                                                          --
------------------------------------------------------------------------------

--  This package provides a set of routines to deal with file extensions

with Ada.Strings.Fixed;
with MLib.Tgt;

package body MLib.Fil is

   use Ada;

   package Target renames MLib.Tgt;

   ---------------
   -- Append_To --
   ---------------

   function Append_To
     (Filename : String;
      Ext      : String) return String
   is
   begin
      if Ext'Length = 0 then
         return Filename;

      elsif Filename (Filename'Last) = '.' then
         if Ext (Ext'First) = '.' then
            return Filename & Ext (Ext'First + 1 .. Ext'Last);

         else
            return Filename & Ext;
         end if;

      else
         if Ext (Ext'First) = '.' then
            return Filename & Ext;

         else
            return Filename & '.' & Ext;
         end if;
      end if;
   end Append_To;

   ------------
   -- Ext_To --
   ------------

   function Ext_To
     (Filename : String;
      New_Ext  : String := "") return String
   is
      use Strings.Fixed;

      J : constant Natural :=
            Index (Source  =>  Filename,
                   Pattern => ".",
                   Going   => Strings.Backward);

   begin
      if J = 0 then
         if New_Ext = "" then
            return Filename;
         else
            return Filename & "." & New_Ext;
         end if;

      else
         if New_Ext = "" then
            return Head (Filename, J - 1);
         else
            return Head (Filename, J - 1) & '.' & New_Ext;
         end if;
      end if;
   end Ext_To;

   -------------
   -- Get_Ext --
   -------------

   function Get_Ext (Filename : String) return String is
      use Strings.Fixed;

      J : constant Natural :=
            Index (Source  =>  Filename,
                   Pattern => ".",
                   Going   => Strings.Backward);

   begin
      if J = 0 then
         return "";
      else
         return Filename (J .. Filename'Last);
      end if;
   end Get_Ext;

   ----------------
   -- Is_Archive --
   ----------------

   function Is_Archive (Filename : String) return Boolean is
      Ext : constant String := Get_Ext (Filename);
   begin
      return Target.Is_Archive_Ext (Ext);
   end Is_Archive;

   ----------
   -- Is_C --
   ----------

   function Is_C (Filename : String) return Boolean is
      Ext : constant String := Get_Ext (Filename);
   begin
      return Target.Is_C_Ext (Ext);
   end Is_C;

   ------------
   -- Is_Obj --
   ------------

   function Is_Obj (Filename : String) return Boolean is
      Ext : constant String := Get_Ext (Filename);
   begin
      return Target.Is_Object_Ext (Ext);
   end Is_Obj;

end MLib.Fil;