1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . V A L _ W C H A R --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2009, 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 3, 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. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
with Interfaces; use Interfaces;
with System.Val_Util; use System.Val_Util;
with System.WCh_Cnv; use System.WCh_Cnv;
with System.WCh_Con; use System.WCh_Con;
package body System.Val_WChar is
--------------------------
-- Value_Wide_Character --
--------------------------
function Value_Wide_Character
(Str : String;
EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character
is
WC : constant Wide_Wide_Character := Value_Wide_Wide_Character (Str, EM);
WV : constant Unsigned_32 := Wide_Wide_Character'Pos (WC);
begin
if WV > 16#FFFF# then
raise Constraint_Error with
"out of range character for Value attribute";
else
return Wide_Character'Val (WV);
end if;
end Value_Wide_Character;
-------------------------------
-- Value_Wide_Wide_Character --
-------------------------------
function Value_Wide_Wide_Character
(Str : String;
EM : System.WCh_Con.WC_Encoding_Method) return Wide_Wide_Character
is
F : Natural;
L : Natural;
S : String (Str'Range) := Str;
begin
Normalize_String (S, F, L);
-- Character literal case
if S (F) = ''' and then S (L) = ''' then
-- Must be at least three characters
if L - F < 2 then
raise Constraint_Error;
-- If just three characters, simple character case
elsif L - F = 2 then
return Wide_Wide_Character'Val (Character'Pos (S (F + 1)));
-- Only other possibility for quoted string is wide char sequence
else
declare
P : Natural;
W : Wide_Wide_Character;
function In_Char return Character;
-- Function for instantiations of Char_Sequence_To_UTF_32
-------------
-- In_Char --
-------------
function In_Char return Character is
begin
P := P + 1;
if P = Str'Last then
raise Constraint_Error;
end if;
return Str (P);
end In_Char;
function UTF_32 is
new Char_Sequence_To_UTF_32 (In_Char);
begin
P := F + 1;
-- Brackets encoding
if S (F + 1) = '[' then
W := Wide_Wide_Character'Val (UTF_32 ('[', WCEM_Brackets));
else
W := Wide_Wide_Character'Val (UTF_32 (S (F + 1), EM));
end if;
if P /= L - 1 then
raise Constraint_Error;
end if;
return W;
end;
end if;
-- Deal with Hex_hhhhhhhh cases for wide_[wide_]character cases
elsif Str'Length = 12
and then Str (Str'First .. Str'First + 3) = "Hex_"
then
declare
W : Unsigned_32 := 0;
begin
for J in Str'First + 4 .. Str'First + 11 loop
W := W * 16 + Character'Pos (Str (J));
if Str (J) in '0' .. '9' then
W := W - Character'Pos ('0');
elsif Str (J) in 'A' .. 'F' then
W := W - Character'Pos ('A') + 10;
elsif Str (J) in 'a' .. 'f' then
W := W - Character'Pos ('a') + 10;
else
raise Constraint_Error;
end if;
end loop;
if W > 16#7FFF_FFFF# then
raise Constraint_Error;
else
return Wide_Wide_Character'Val (W);
end if;
end;
-- Otherwise must be one of the special names for Character
else
return
Wide_Wide_Character'Val (Character'Pos (Character'Value (Str)));
end if;
exception
when Constraint_Error =>
raise Constraint_Error with "invalid string for value attribute";
end Value_Wide_Wide_Character;
end System.Val_WChar;
|
