------------------------------------------------------------------------------
--                                                                          --
--                            Matreshka Project                             --
--                                                                          --
--         Localization, Internationalization, Globalization for Ada        --
--                                                                          --
--                              Tools Component                             --
--                                                                          --
------------------------------------------------------------------------------
--                                                                          --
-- Copyright © 2010-2011, Vadim Godunko <vgodunko@gmail.com>                --
-- All rights reserved.                                                     --
--                                                                          --
-- Redistribution and use in source and binary forms, with or without       --
-- modification, are permitted provided that the following conditions       --
-- are met:                                                                 --
--                                                                          --
--  * Redistributions of source code must retain the above copyright        --
--    notice, this list of conditions and the following disclaimer.         --
--                                                                          --
--  * Redistributions in binary form must reproduce the above copyright     --
--    notice, this list of conditions and the following disclaimer in the   --
--    documentation and/or other materials provided with the distribution.  --
--                                                                          --
--  * Neither the name of the Vadim Godunko, IE nor the names of its        --
--    contributors may be used to endorse or promote products derived from  --
--    this software without specific prior written permission.              --
--                                                                          --
-- THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS      --
-- "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT        --
-- LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR    --
-- A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT     --
-- HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,   --
-- SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED --
-- TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR   --
-- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF   --
-- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING     --
-- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS       --
-- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.             --
--                                                                          --
------------------------------------------------------------------------------
--  $Revision: 1535 $ $Date: 2011-02-25 22:56:48 +0300 (Пт, 25 фев 2011) $
------------------------------------------------------------------------------
with Ada.Command_Line;
with Ada.Directories;
with Ada.Strings.Unbounded.Text_IO;
with Ada.Text_IO;

with GNAT.Regpat;

procedure Configure.Instantiate
 (Configuration_File_Name : String;
  Suppress_Message        : Boolean := False)
is

   use Ada.Command_Line;
   use Ada.Directories;
   use Ada.Strings.Unbounded;
   use Ada.Strings.Unbounded.Text_IO;
   use Ada.Text_IO;
   use GNAT.Regpat;

   function "+" (Item : Unbounded_String) return String renames To_String;

   Template_File      : File_Type;
   Configuration_File : File_Type;
   Line               : Unbounded_String;
   Replacement        : Unbounded_String;
   Pattern            : Pattern_Matcher := Compile ("(@(.+?)@)");
   Matches            : Match_Array (0 .. 2);

begin
   if not Suppress_Message then
      Put_Line
       (Simple_Name (Command_Name) & ": creating " & Configuration_File_Name);
   end if;

   Open (Template_File, In_File, Configuration_File_Name & ".in");
   Create (Configuration_File, Out_File, Configuration_File_Name);

   while not End_Of_File (Template_File) loop
      Line := Get_Line (Template_File);

      loop
         Match (Pattern, +Line, Matches);

         exit when Matches (0) = No_Match;

         if Substitutions.Contains
             (Unbounded_Slice (Line, Matches (2).First, Matches (2).Last))
         then
            Replacement :=
              Substitutions.Element
               (Unbounded_Slice (Line, Matches (2).First, Matches (2).Last));

         else
            Warning
             ("substitution '"
                & Slice (Line, Matches (2).First, Matches (2).Last)
                & "' is not defined");
            Replacement := Null_Unbounded_String;
         end if;

         Replace_Slice
          (Line, Matches (1).First, Matches (1).Last, +Replacement);
      end loop;

      Put_Line (Configuration_File, Line);
   end loop;

   Close (Configuration_File);
   Close (Template_File);
end Configure.Instantiate;