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
|
-- --
-- package Strings_Edit.UTF8 Copyright (c) Dmitry A. Kazakov --
-- Interface Luebeck --
-- Spring, 2005 --
-- --
-- Last revision : 10:11 25 Jun 2005 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- 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 along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- --
-- --
-- --
-- --
-- --
-- --
--____________________________________________________________________--
package Strings_Edit.UTF8 is
--
-- UTF8_Code_Point -- UFT-8 codespace
--
type Code_Point is mod 2**32;
subtype UTF8_Code_Point is Code_Point range 0..16#10FFFF#;
--
-- Script_Base -- Supported bases of sub- and superscript integers
--
subtype Script_Base is NumberBase range 2..10;
--
-- Script_Digit -- Sub- and superscript digits
--
type Script_Digit is range 0..9;
type Sign is (Minus, None, Plus);
--
-- Get -- Get one UTF-8 code point
--
-- Source - The source string
-- Pointer - The string position to start at
-- Value - The result
--
-- This procedure decodes one UTF-8 code point from the string Source.
-- It starts at Source (Pointer). After successful completion Pointer is
-- advanced to the first character following the input. The result is
-- returned through the parameter Value.
--
-- Exceptions :
--
-- Data_Error - UTF-8 syntax error
-- End_Error - Nothing found
-- Layout_Error - Pointer is not in Source'First..Source'Last + 1
--
procedure Get
( Source : String;
Pointer : in out Integer;
Value : out UTF8_Code_Point
);
--
-- Image -- Of an UTF-8 code point
--
-- Value - The code point
--
-- Returns :
--
-- UTF-8 encoded equivalent
--
function Image (Value : UTF8_Code_Point) return String;
--
-- Put -- Put one UTF-8 code point
--
-- Destination - The target string
-- Pointer - The position where to place the character
-- Value - The code point to put
--
-- This procedure puts one UTF-8 code point into the string Source
-- starting from the position Source (Pointer). Pointer is then advanced
-- to the first character following the output.
--
-- Exceptions :
--
-- Layout_Error - Pointer is not in Destination'Range of there is no
-- room for output
--
procedure Put
( Destination : in out String;
Pointer : in out Integer;
Value : UTF8_Code_Point
);
--
-- Length -- The length of an UTF-8 string
--
-- Source - The string containing UTF-8 encoded code points
--
-- Returns :
--
-- The number of UTF-8 encoded code points in Source
--
-- Exceptions :
--
-- Data_Error - Invalid string
--
function Length (Source : String) return Natural;
--
-- Skip -- Skip UTF-8 code point
--
-- Source - UTF-8 encoded string
-- Pointer - The position of the first UTF-8 code point to skip
-- Count - The number of code points to skip
--
-- After successful completion Source (Pointer) is the first character
-- following Count skipped UTF-8 encoded code points.
--
-- Exceptions :
--
-- Data_Error - Invalid string
-- Layout_Error - Pointer is not in Source'First..Source'Last + 1
-- End_Error - Less than Count UTF-8 points to skip
--
procedure Skip
( Source : String;
Pointer : in out Integer;
Count : Natural := 1
);
--
-- Value -- Conversion to code point
--
-- Source - One UTF-8 encoded code point
--
-- Returns :
--
-- The code point
--
-- Exceptions :
--
-- Data_Error - Illegal UTF-8 string
--
function Value (Source : String) return UTF8_Code_Point;
private
--
-- Reverse_Put -- Put one code point in reverse
--
-- Destination - The target string
-- Pointer - The position where to place the encoded point
-- Prefix - The prefix in UTF-8 encoding
-- Position - The position of the last encoded character
--
-- This procedure places Prefix & Character'Val (Position) in the
-- positions of Destination (..Pointer). Then Pointer is moved back to
-- the first position before the first character of the output.
--
-- Exceptions :
--
-- Layout_Error - No room for output
--
procedure Reverse_Put
( Destination : in out String;
Pointer : in out Integer;
Prefix : String;
Position : Natural
);
end Strings_Edit.UTF8;
|
