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-----------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . I M G _ W C H A R --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 1992-1998, Free Software Foundation, Inc. --
-- --
-- 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, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, 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. --
-- --
------------------------------------------------------------------------------
with System.Img_Char; use System.Img_Char;
with System.WCh_Con; use System.WCh_Con;
with System.WCh_WtS; use System.WCh_WtS;
package body System.Img_WChar is
--------------------------
-- Image_Wide_Character --
--------------------------
function Image_Wide_Character
(V : Wide_Character;
EM : WC_Encoding_Method)
return String
is
Val : constant Natural := Wide_Character'Pos (V);
WS : Wide_String (1 .. 3);
begin
-- If in range of standard character, use standard character routine
if Val < 16#80#
or else (Val <= 16#FF#
and then EM not in WC_Upper_Half_Encoding_Method)
then
return Image_Character (Character'Val (Val));
-- if the value is one of the last two characters in the type, use
-- their language-defined names (3.5.2(3)).
elsif Val = 16#FFFE# then
return "FFFE";
elsif Val = 16#FFFF# then
return "FFFF";
-- Otherwise return an appropriate escape sequence (i.e. one matching
-- the convention implemented by Scn.Wide_Char). The easiest thing is
-- to build a wide string for the result, and then use the Wide_Value
-- function to build the resulting String.
else
WS (1) := ''';
WS (2) := V;
WS (3) := ''';
return Wide_String_To_String (WS, EM);
end if;
end Image_Wide_Character;
end System.Img_WChar;
|
