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

--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--              A D A . C H A R A C T E R S . H A N D L I N G               --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--            Copyright (C) 2005, Free Software Foundation, Inc.            --

--                                                                          --

-- This specification is derived from the Ada Reference Manual for use with --

-- GNAT. The copyright notice above, and the license provisions that follow --

-- apply solely to the  contents of the part following the private keyword. --

--                                                                          --

-- 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 2,  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 COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, USA.                                              --

--                                                                          --

-- As a special exception,  if other files  instantiate  generics from this --

-- unit, or you link  this unit with other files  to produce an executable, --

-- this  unit  does not  by itself cause  the resulting  executable  to  be --

-- covered  by the  GNU  General  Public  License.  This exception does not --

-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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

package body Ada.Characters.Conversions is

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

   -- Is_Character --

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

   function Is_Character (Item : Wide_Character) return Boolean is

   begin

      return Wide_Character'Pos (Item) < 256;

   end Is_Character;

   function Is_Character (Item : Wide_Wide_Character) return Boolean is

   begin

      return Wide_Wide_Character'Pos (Item) < 256;

   end Is_Character;

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

   -- Is_String --

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

   function Is_String (Item : Wide_String) return Boolean is

   begin

      for J in Item'Range loop

         if Wide_Character'Pos (Item (J)) >= 256 then

            return False;

         end if;

      end loop;

      return True;

   end Is_String;

   function Is_String (Item : Wide_Wide_String) return Boolean is

   begin

      for J in Item'Range loop

         if Wide_Wide_Character'Pos (Item (J)) >= 256 then

            return False;

         end if;

      end loop;

      return True;

   end Is_String;

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

   -- Is_Wide_Character --

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

   function Is_Wide_Character (Item : Wide_Wide_Character) return Boolean is

   begin

      return Wide_Wide_Character'Pos (Item) < 2**16;

   end Is_Wide_Character;

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

   -- Is_Wide_String --

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

   function Is_Wide_String (Item : Wide_Wide_String) return Boolean is

   begin

      for J in Item'Range loop

         if Wide_Wide_Character'Pos (Item (J)) >= 2**16 then

            return False;

         end if;

      end loop;

      return True;

   end Is_Wide_String;

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

   -- To_Character --

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

   function To_Character

     (Item       : Wide_Character;

      Substitute : Character := ' ') return Character

   is

   begin

      if Is_Character (Item) then

         return Character'Val (Wide_Character'Pos (Item));

      else

         return Substitute;

      end if;

   end To_Character;

   function To_Character

     (Item       : Wide_Wide_Character;

      Substitute : Character := ' ') return Character

   is

   begin

      if Is_Character (Item) then

         return Character'Val (Wide_Wide_Character'Pos (Item));

      else

         return Substitute;

      end if;

   end To_Character;

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

   -- To_String --

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

   function To_String

     (Item       : Wide_String;

      Substitute : Character := ' ') return String

   is

      Result : String (1 .. Item'Length);

   begin

      for J in Item'Range loop

         Result (J - (Item'First - 1)) := To_Character (Item (J), Substitute);

      end loop;

      return Result;

   end To_String;

   function To_String

     (Item       : Wide_Wide_String;

      Substitute : Character := ' ') return String

   is

      Result : String (1 .. Item'Length);

   begin

      for J in Item'Range loop

         Result (J - (Item'First - 1)) := To_Character (Item (J), Substitute);

      end loop;

      return Result;

   end To_String;

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

   -- To_Wide_Character --

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

   function To_Wide_Character

     (Item : Character) return Wide_Character

   is

   begin

      return Wide_Character'Val (Character'Pos (Item));

   end To_Wide_Character;

   function To_Wide_Character

     (Item       : Wide_Wide_Character;

      Substitute : Wide_Character := ' ') return Wide_Character

   is

   begin

      if Wide_Wide_Character'Pos (Item) < 2**16 then

         return Wide_Character'Val (Wide_Wide_Character'Pos (Item));

      else

         return Substitute;

      end if;

   end To_Wide_Character;

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

   -- To_Wide_String --

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

   function To_Wide_String

     (Item : String) return Wide_String

   is

      Result : Wide_String (1 .. Item'Length);

   begin

      for J in Item'Range loop

         Result (J - (Item'First - 1)) := To_Wide_Character (Item (J));

      end loop;

      return Result;

   end To_Wide_String;

   function To_Wide_String

     (Item       : Wide_Wide_String;

      Substitute : Wide_Character := ' ') return Wide_String

   is

      Result : Wide_String (1 .. Item'Length);

   begin

      for J in Item'Range loop

         Result (J - (Item'First - 1)) :=

           To_Wide_Character (Item (J), Substitute);

      end loop;

      return Result;

   end To_Wide_String;

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

   -- To_Wide_Wide_Character --

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

   function To_Wide_Wide_Character

     (Item : Character) return Wide_Wide_Character

   is

   begin

      return Wide_Wide_Character'Val (Character'Pos (Item));

   end To_Wide_Wide_Character;

   function To_Wide_Wide_Character

     (Item : Wide_Character) return Wide_Wide_Character

   is

   begin

      return Wide_Wide_Character'Val (Wide_Character'Pos (Item));

   end To_Wide_Wide_Character;

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

   -- To_Wide_Wide_String --

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

   function To_Wide_Wide_String

     (Item : String) return Wide_Wide_String

   is

      Result : Wide_Wide_String (1 .. Item'Length);

   begin

      for J in Item'Range loop

         Result (J - (Item'First - 1)) := To_Wide_Wide_Character (Item (J));

      end loop;

      return Result;

   end To_Wide_Wide_String;

   function To_Wide_Wide_String

     (Item : Wide_String) return Wide_Wide_String

   is

      Result : Wide_Wide_String (1 .. Item'Length);

   begin

      for J in Item'Range loop

         Result (J - (Item'First - 1)) := To_Wide_Wide_Character (Item (J));

      end loop;

      return Result;

   end To_Wide_Wide_String;

end Ada.Characters.Conversions;