1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- S Y S T E M . V A L _ W C H A R --
9 -- Copyright (C) 1992-2005, Free Software Foundation, Inc. --
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 2, 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. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, USA. --
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. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 with Interfaces; use Interfaces;
35 with System.Val_Util; use System.Val_Util;
37 package body System.Val_WChar is
39 --------------------------
40 -- Value_Wide_Character --
41 --------------------------
43 function Value_Wide_Character
44 (Str : String) return Wide_Character
46 WWC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str);
47 WWV : constant Unsigned_32 := Wide_Wide_Character'Pos (WWC);
49 if WWV > 16#FFFF# then
50 raise Constraint_Error
51 with "out of range character for Value attribute";
53 return Wide_Character'Val (WWV);
55 end Value_Wide_Character;
57 -------------------------------
58 -- Value_Wide_Wide_Character --
59 -------------------------------
61 function Value_Wide_Wide_Character
62 (Str : String) return Wide_Wide_Character
66 S : String (Str'Range) := Str;
69 Normalize_String (S, F, L);
71 -- Character literal case
73 if S (F) = ''' and then S (L) = ''' then
75 -- If just three characters, simple character case
78 return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
80 -- Otherwise something is very wrong
83 raise Constraint_Error with "invalid string for Value attribute";
86 -- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
88 elsif Str'Length = 12 and then Str (1 .. 4) = "Hex_" then
94 W := W * 16 + Character'Pos (Str (J));
96 if Str (J) in '0' .. '9' then
97 W := W - Character'Pos ('0');
98 elsif Str (J) in 'A' .. 'F' then
99 W := W - Character'Pos ('A') + 10;
100 elsif Str (J) in 'a' .. 'f' then
101 W := W - Character'Pos ('a') + 10;
103 raise Constraint_Error
104 with "illegal hex character for Value attribute";
108 if W > 16#7FFF_FFFF# then
109 raise Constraint_Error
110 with "out of range value for Value attribute";
112 return Wide_Wide_Character'Val (W);
116 -- Otherwise must be one of the special names for Character
120 Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
122 end Value_Wide_Wide_Character;
124 end System.Val_WChar;