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
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ S T W --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2024, 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 System.WCh_Con; use System.WCh_Con;
with System.WCh_Cnv; use System.WCh_Cnv;
package body System.WCh_StW is
-----------------------
-- Local Subprograms --
-----------------------
procedure Get_Next_Code
(S : String;
P : in out Natural;
V : out UTF_32_Code;
EM : WC_Encoding_Method);
-- Scans next character starting at S(P) and returns its value in V. On
-- exit P is updated past the last character read. Raises Constraint_Error
-- if the string is not well formed. Raises Constraint_Error if the code
-- value is greater than 16#7FFF_FFFF#. On entry P <= S'Last.
-------------------
-- Get_Next_Code --
-------------------
procedure Get_Next_Code
(S : String;
P : in out Natural;
V : out UTF_32_Code;
EM : WC_Encoding_Method)
is
function In_Char return Character;
-- Function to return a character, bumping P, raises Constraint_Error
-- if P > S'Last on entry.
function Get_UTF_32 is new Char_Sequence_To_UTF_32 (In_Char);
-- Function to get next UFT_32 value
-------------
-- In_Char --
-------------
function In_Char return Character is
begin
if P > S'Last then
raise Constraint_Error with "badly formed wide character code";
else
P := P + 1;
return S (P - 1);
end if;
end In_Char;
-- Start of processing for Get_Next_Code
begin
-- Check for wide character encoding
case EM is
when WCEM_Hex =>
if S (P) = ASCII.ESC then
V := Get_UTF_32 (In_Char, EM);
return;
end if;
when WCEM_Upper | WCEM_Shift_JIS | WCEM_EUC | WCEM_UTF8 =>
if S (P) >= Character'Val (16#80#) then
V := Get_UTF_32 (In_Char, EM);
return;
end if;
when WCEM_Brackets =>
if P + 2 <= S'Last
and then S (P) = '['
and then S (P + 1) = '"'
and then S (P + 2) /= '"'
then
V := Get_UTF_32 (In_Char, EM);
return;
end if;
end case;
-- If it is not a wide character code, just get it
V := Character'Pos (S (P));
P := P + 1;
end Get_Next_Code;
---------------------------
-- String_To_Wide_String --
---------------------------
procedure String_To_Wide_String
(S : String;
R : out Wide_String;
L : out Natural;
EM : System.WCh_Con.WC_Encoding_Method)
is
SP : Natural;
V : UTF_32_Code;
begin
pragma Assert (S'First = 1);
SP := S'First;
L := 0;
while SP <= S'Last loop
Get_Next_Code (S, SP, V, EM);
if V > 16#FFFF# then
raise Constraint_Error with
"out of range value for wide character";
end if;
L := L + 1;
R (L) := Wide_Character'Val (V);
end loop;
end String_To_Wide_String;
--------------------------------
-- String_To_Wide_Wide_String --
--------------------------------
procedure String_To_Wide_Wide_String
(S : String;
R : out Wide_Wide_String;
L : out Natural;
EM : System.WCh_Con.WC_Encoding_Method)
is
pragma Assert (S'First = 1);
SP : Natural;
V : UTF_32_Code;
begin
SP := S'First;
L := 0;
while SP <= S'Last loop
Get_Next_Code (S, SP, V, EM);
L := L + 1;
R (L) := Wide_Wide_Character'Val (V);
end loop;
end String_To_Wide_Wide_String;
end System.WCh_StW;
|
