--  Copyright (c) 2021 Bob Goddard <git@1.git.bgcomp.co.uk>
--
--  This file is free software: you may copy, redistribute and/or modify it
--  under the terms of the GNU General Public License as published by the
--  Free Software Foundation, either version 2 of the License, or (at your
--  option) any later version.
--
--  This file is distributed in the hope that it will be useful, but
--  WITHOUT 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
--  along with this program.  If not, see <http://www.gnu.org/licenses/>.

package body String_Stream is

   -----------
   -- Write --
   -----------

   procedure Write
     (Stream : in out String_Stream_Type;
      Item   : Stream_Element_Array)
   is
      Str : String (1 .. Integer (Item'Length));
      S   : Integer := Str'First;
   begin
      for J in Item'Range loop
         Str (S) := Character'Val (Item (J));
         S := S + 1;
      end loop;
      Append (Stream.Str, Str);
   end Write;

   ----------
   -- Open --
   ----------

   procedure Open
     (Stream : in out String_Stream_Type'Class;
      Str    : String) is
   begin
      Stream.Str        := To_Unbounded_String (Str);
      Stream.Read_Index := 1;
   end Open;

   ----------
   -- Read --
   ----------

   procedure Read
     (Stream : in out String_Stream_Type;
      Item   :    out Stream_Element_Array;
      Last   :    out Stream_Element_Offset)
   is
      Str : constant String := Slice
        (Stream.Str, Stream.Read_Index, Stream.Read_Index + Item'Length - 1);
      J   : Stream_Element_Offset := Item'First;
   begin
      for S in Str'Range loop
         Item (J) := Stream_Element (Character'Pos (Str (S)));
         J := J + 1;
      end loop;
      Last := Item'First + Str'Length - 1;
      Stream.Read_Index := Stream.Read_Index + Item'Length;
   end Read;

end String_Stream;
