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
|
#include "unicode.hh"
#include "misc.hh"
using namespace lout::misc;
namespace lout {
namespace unicode {
static unsigned char alpha[0x500] = {
// 0000-007F: C0 Controls and Basic Latin
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xfe, 0xff, 0xff, 0x07, 0xfe, 0xff, 0xff, 0x07,
// 0080-00FF: C1 Controls and Latin-1 Supplement
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0x7f, 0xff, 0xff, 0xff, 0x7f, 0xff,
// 0100-017F: Latin Extended-A
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
// 0180-024F: Latin Extended-B
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff,
// 0250–02AF: IPA Extensions
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
// 02B0–02FF: Spacing Modifier Letters
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00,
// 0300–036F: Combining Diacritical Marks
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
// 0370–03FF: Greek and Coptic
0xcf, 0x00, 0x40, 0x7d, 0xff, 0xff, 0xfb, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
// 0400–04FF: Cyrillic
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x03, 0xfc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
/**
* Returns whether a given unicode character is an alphabetic character.
*/
bool isAlpha (int ch)
{
return ch < 0x500 && (alpha[ch / 8] & (1 << (ch & 7)));
}
int decodeUtf8 (const char *s)
{
if((s[0] & 0x80) == 0)
return s[0];
else if((s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80)
return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
else if((s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80)
return ((s[0] & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
else if((s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80)
return ((s[0] & 0x0f) << 18) | ((s[1] & 0x3f) << 12)
| ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
else
// Treat as ISO-8859-1 / ISO-8859-15 / Windows-1252
return s[0];
}
int decodeUtf8 (const char *s, int len)
{
if(len >= 1 && (s[0] & 0x80) == 0)
return s[0];
else if(len >= 2 && (s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80)
return ((s[0] & 0x1f) << 6) | (s[1] & 0x3f);
else if(len >= 3 && (s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80)
return ((s[0] & 0x0f) << 12) | ((s[1] & 0x3f) << 6) | (s[2] & 0x3f);
else if(len >= 4 && (s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80)
return ((s[0] & 0x0f) << 18) | ((s[1] & 0x3f) << 12)
| ((s[2] & 0x3f) << 6) | (s[3] & 0x3f);
else
// Treat as ISO-8859-1 / ISO-8859-15 / Windows-1252
return s[0];
}
const char *nextUtf8Char (const char *s)
{
const char *r;
if (s == NULL || s[0] == 0)
r = NULL;
else if((s[0] & 0x80) == 0)
r = s + 1;
else if((s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80)
r = s + 2;
else if((s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80)
r = s + 3;
else if((s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80)
r = s + 4;
else
// invalid UTF-8 sequence: treat as one byte.
r = s + 1;
if (r && r[0] == 0)
return NULL;
else
return r;
}
const char *nextUtf8Char (const char *s, int len)
{
const char *r;
if (s == NULL || len <= 0)
r = NULL;
else if(len >= 1 && (s[0] & 0x80) == 0)
r = s + 1;
else if(len >= 2 && (s[0] & 0xe0) == 0xc0 && (s[1] & 0xc0) == 0x80)
r = s + 2;
else if(len >= 3 && (s[0] & 0xf0) == 0xe0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80)
r = s + 3;
else if(len >= 4 && (s[0] & 0xf8) == 0xf0 && (s[1] & 0xc0) == 0x80
&& (s[2] & 0xc0) == 0x80 && (s[3] & 0xc0) == 0x80)
r = s + 4;
else
// invalid UTF-8 sequence: treat as one byte.
r = s + 1;
if (r && r - s >= len)
return NULL;
else
return r;
}
int numUtf8Chars (const char *s)
{
int numUtf8 = 0;
for (const char *r = s; r; r = nextUtf8Char (r))
numUtf8++;
return numUtf8;
}
int numUtf8Chars (const char *s, int len)
{
int numUtf8 = 0;
for (const char *r = s; len > 0 && r; r = nextUtf8Char (r, len))
numUtf8++;
return numUtf8;
}
} // namespace lout
} // namespace unicode
|
