------------------------------------------------------------------------------
--                                                                          --
--                           POLYORB COMPONENTS                             --
--                                                                          --
--                               E R R O R S                                --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--         Copyright (C) 2004-2017, Free Software Foundation, Inc.          --
--                                                                          --
-- This 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.  This software is distributed in the hope  that it will be useful, --
-- but WITHOUT ANY WARRANTY;  without even the implied warranty of MERCHAN- --
-- TABILITY 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 and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
--                  PolyORB is maintained by AdaCore                        --
--                     (email: sales@adacore.com)                           --
--                                                                          --
------------------------------------------------------------------------------

with Output; use Output;
with Namet;  use Namet;
with Utils;

package body Errors is

   procedure Initialize;
   --  [Re]Initialize global variables to decrease the likelihood of silently
   --  using old values.

   -------------------
   -- Display_Error --
   -------------------

   procedure Display_Error (Template : Message_Template) is
      procedure Check_Space;
      --  Ensure the last character of the name buffer is a space

      -----------------
      -- Check_Space --
      -----------------

      procedure Check_Space is
      begin
         if Name_Len > 0 and then Name_Buffer (Name_Len) /= ' ' then
            Add_Char_To_Name_Buffer (' ');
         end if;
      end Check_Space;

      --  N, L, and I are the indices mentioned in the spec

      N : Natural range 1 .. 3 := 1;  --  Index into Error_Name
      L : Natural range 1 .. 3 := 1;  --  Index into Error_Loc
      I : Natural range 1 .. 3 := 1;  --  Index into Error_Int

      Special : Boolean := False;
      --  True when the current character is a special insertion character

      type Message_Kind is (K_Error, K_Warning, K_Continuation);
      Kind : Message_Kind;

   begin
      if Error_Loc (L) = No_Location then
         Set_Str_To_Name_Buffer (Utils.Simple_Command_Name);
      else
         Set_Str_To_Name_Buffer (Image (Error_Loc (L)));
      end if;
      L := L + 1;
      Add_Str_To_Name_Buffer (": ");

      Kind := K_Error;
      for J in Template'Range loop
         case Template (J) is
            when '\' =>
               Kind := K_Continuation;
               exit;
            when '?' =>
               Kind := K_Warning;
               exit;
            when others =>
               null;
         end case;
      end loop;

      case Kind is
         when K_Error =>
            N_Errors := N_Errors + 1;

         when K_Warning =>
            N_Warnings := N_Warnings + 1;
            Add_Str_To_Name_Buffer ("warning: ");

         when K_Continuation =>
            null;
      end case;

      for J in Template'Range loop

         --  Process special insertion characters

         case Template (J) is
            when '%' =>
               Check_Space;
               Get_Name_String_And_Append (Error_Name (N));
               N := N + 1;
               Special := True;

            when '#' =>
               Check_Space;
               Add_Char_To_Name_Buffer ('"');
               Get_Name_String_And_Append (Error_Name (N));
               Add_Char_To_Name_Buffer ('"');
               N := N + 1;
               Special := True;

            when '!' =>
               case L is
                  when 1 =>
                     Add_Str_To_Name_Buffer (Image (Error_Loc (1)));

                  when 2 =>
                     Check_Space;
                     if Error_Loc (1).File = Error_Loc (2).File then
                        Add_Str_To_Name_Buffer ("at line ");
                        Add_Nat_To_Name_Buffer (Error_Loc (2).Line);

                     else
                        Add_Str_To_Name_Buffer ("at ");
                        Add_Str_To_Name_Buffer (Image (Error_Loc (2)));
                     end if;

                  when 3 => raise Program_Error;
               end case;

               L := L + 1;
               Special := True;

            when '$' =>
               Add_Nat_To_Name_Buffer (Error_Int (I));
               I := I + 1;
               Special := True;

            when '?' | '\' =>
               --  Already dealt with

               null;

            when others =>
               --  Add space after insertion if not provided by S

               if Special then
                  if Template (J) /= ' ' then
                     Add_Char_To_Name_Buffer (' ');
                  end if;
                  Special := False;
               end if;

               Add_Char_To_Name_Buffer (Template (J));
         end case;
      end loop;

      Set_Standard_Error;
      Write_Line (Name_Buffer (1 .. Name_Len));
      Set_Standard_Output;

      --  Reset all insertion data to ensure it is not erroneously propagated
      --  from one error to another.

      Initialize;

   end Display_Error;

   -------------------
   -- Display_Error --
   -------------------

   procedure Display_Error (Template : Message_Template; S : String) is
   begin
      Set_Str_To_Name_Buffer (S);
      Error_Name (1) := Name_Find;
      Display_Error (Template);
   end Display_Error;

   ----------------
   -- Initialize --
   ----------------

   procedure Initialize is
   begin
      Error_Loc  := (others => No_Location);
      Error_Name := (others => No_Name);
      Error_Int  := (others => Int'Last);
   end Initialize;

begin
   Initialize;
end Errors;