gcc/ada/s-imgwch.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --                     S Y S T E M . I M G _ W C H A R                      --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --
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  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
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  20 -- MA 02111-1307, USA.                                                      --
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  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with System.Img_Char; use System.Img_Char;
  35 with System.WCh_Con;  use System.WCh_Con;
  36 with System.WCh_WtS;  use System.WCh_WtS;
  37
  38 package body System.Img_WChar is
  39
  40    --------------------------
  41    -- Image_Wide_Character --
  42    --------------------------
  43
  44    function Image_Wide_Character
  45      (V  : Wide_Character;
  46       EM : WC_Encoding_Method) return String
  47    is
  48       Val : constant Natural := Wide_Character'Pos (V);
  49       WS  : Wide_String (1 .. 3);
  50
  51    begin
  52       --  If in range of standard character, use standard character routine
  53
  54       if Val < 16#80#
  55         or else (Val <= 16#FF#
  56                   and then EM not in WC_Upper_Half_Encoding_Method)
  57       then
  58          return Image_Character (Character'Val (Val));
  59
  60       --  if the value is one of the last two characters in the type, use
  61       --  their language-defined names (3.5.2(3)).
  62
  63       elsif Val = 16#FFFE# then
  64          return "FFFE";
  65
  66       elsif Val = 16#FFFF# then
  67          return "FFFF";
  68
  69       --  Otherwise return an appropriate escape sequence (i.e. one matching
  70       --  the convention implemented by Scn.Wide_Char). The easiest thing is
  71       --  to build a wide string for the result, and then use the Wide_Value
  72       --  function to build the resulting String.
  73
  74       else
  75          WS (1) := ''';
  76          WS (2) := V;
  77          WS (3) := ''';
  78
  79          return Wide_String_To_String (WS, EM);
  80       end if;
  81    end Image_Wide_Character;
  82
  83    -------------------------------
  84    -- Image_Wide_Wide_Character --
  85    -------------------------------
  86
  87    function Image_Wide_Wide_Character
  88      (V  : Wide_Wide_Character;
  89       EM : WC_Encoding_Method) return String
  90    is
  91       Val : constant Natural := Wide_Wide_Character'Pos (V);
  92       WS  : Wide_Wide_String (1 .. 3);
  93
  94    begin
  95       --  If in range of standard Wide_Character, then we use the
  96       --  Wide_Character routine
  97
  98       if Val <= 16#FFFF# then
  99          return Image_Wide_Character (Wide_Character'Val (Val), EM);
 100
 101       --  Otherwise return an appropriate escape sequence (i.e. one matching
 102       --  the convention implemented by Scn.Wide_Wide_Char). The easiest thing
 103       --  is to build a wide string for the result, and then use the
 104       --  Wide_Wide_Value function to build the resulting String.
 105
 106       else
 107          WS (1) := ''';
 108          WS (2) := V;
 109          WS (3) := ''';
 110
 111          return Wide_Wide_String_To_String (WS, EM);
 112       end if;
 113    end Image_Wide_Wide_Character;
 114
 115 end System.Img_WChar;