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
|
------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ S T W --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2005 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
-- Boston, MA 02110-1301, USA. --
-- --
-- As a special exception, if other files instantiate generics from this --
-- unit, or you link this unit with other files to produce an executable, --
-- this unit does not by itself cause the resulting executable to be --
-- covered by the GNU General Public License. This exception does not --
-- however invalidate any other reasons why the executable file might be --
-- covered by the GNU Public License. --
-- --
-- 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;
else
P := P + 1;
return S (P - 1);
end if;
end In_Char;
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 --
---------------------------
function String_To_Wide_String
(S : String;
EM : WC_Encoding_Method) return Wide_String
is
R : Wide_String (1 .. S'Length);
RP : Natural;
SP : Natural;
V : UTF_32_Code;
begin
SP := S'First;
RP := 0;
while SP <= S'Last loop
Get_Next_Code (S, SP, V, EM);
if V > 16#FFFF# then
raise Constraint_Error;
end if;
RP := RP + 1;
R (RP) := Wide_Character'Val (V);
end loop;
return R (1 .. RP);
end String_To_Wide_String;
--------------------------------
-- String_To_Wide_Wide_String --
--------------------------------
function String_To_Wide_Wide_String
(S : String;
EM : WC_Encoding_Method) return Wide_Wide_String
is
R : Wide_Wide_String (1 .. S'Length);
RP : Natural;
SP : Natural;
V : UTF_32_Code;
begin
SP := S'First;
RP := 0;
while SP <= S'Last loop
Get_Next_Code (S, SP, V, EM);
RP := RP + 1;
R (RP) := Wide_Wide_Character'Val (V);
end loop;
return R (1 .. RP);
end String_To_Wide_Wide_String;
end System.WCh_StW;
|
