1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                     S Y S T E M . W W D _ W C H A R                      --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--          Copyright (C) 1992-2020, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32with Interfaces; use Interfaces;
33
34with System.WWd_Char;
35
36package body System.Wwd_WChar is
37
38   ------------------------------------
39   -- Wide_Wide_Width_Wide_Character --
40   ------------------------------------
41
42   --  This is the case where we are talking about the Wide_Wide_Image of
43   --  a Wide_Character, which is always the same character sequence as the
44   --  Wide_Image of the same Wide_Character.
45
46   function Wide_Wide_Width_Wide_Character
47     (Lo, Hi : Wide_Character) return Natural
48   is
49   begin
50      return Wide_Width_Wide_Character (Lo, Hi);
51   end Wide_Wide_Width_Wide_Character;
52
53   ------------------------------------
54   -- Wide_Wide_Width_Wide_Wide_Char --
55   ------------------------------------
56
57   function Wide_Wide_Width_Wide_Wide_Char
58     (Lo, Hi : Wide_Wide_Character) return Natural
59   is
60      LV : constant Unsigned_32 := Wide_Wide_Character'Pos (Lo);
61      HV : constant Unsigned_32 := Wide_Wide_Character'Pos (Hi);
62
63   begin
64      --  Return zero if empty range
65
66      if LV > HV then
67         return 0;
68
69      --  Return max value (12) for wide character (Hex_hhhhhhhh)
70
71      elsif HV > 255 then
72         return 12;
73
74      --  If any characters in normal character range, then use normal
75      --  Wide_Wide_Width attribute on this range to find out a starting point.
76      --  Otherwise start with zero.
77
78      else
79         return
80           System.WWd_Char.Wide_Wide_Width_Character
81             (Lo => Character'Val (LV),
82              Hi => Character'Val (Unsigned_32'Min (255, HV)));
83      end if;
84   end Wide_Wide_Width_Wide_Wide_Char;
85
86   -------------------------------
87   -- Wide_Width_Wide_Character --
88   -------------------------------
89
90   function Wide_Width_Wide_Character
91     (Lo, Hi : Wide_Character) return Natural
92   is
93      LV : constant Unsigned_32 := Wide_Character'Pos (Lo);
94      HV : constant Unsigned_32 := Wide_Character'Pos (Hi);
95
96   begin
97      --  Return zero if empty range
98
99      if LV > HV then
100         return 0;
101
102      --  Return max value (12) for wide character (Hex_hhhhhhhh)
103
104      elsif HV > 255 then
105         return 12;
106
107      --  If any characters in normal character range, then use normal
108      --  Wide_Wide_Width attribute on this range to find out a starting point.
109      --  Otherwise start with zero.
110
111      else
112         return
113           System.WWd_Char.Wide_Width_Character
114             (Lo => Character'Val (LV),
115              Hi => Character'Val (Unsigned_32'Min (255, HV)));
116      end if;
117   end Wide_Width_Wide_Character;
118
119   ------------------------------------
120   -- Wide_Width_Wide_Wide_Character --
121   ------------------------------------
122
123   function Wide_Width_Wide_Wide_Character
124     (Lo, Hi : Wide_Wide_Character) return Natural
125   is
126   begin
127      return Wide_Wide_Width_Wide_Wide_Char (Lo, Hi);
128   end Wide_Width_Wide_Wide_Character;
129
130end System.Wwd_WChar;
131