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
|
#include "macros.h"
#include "mbstring.h"
#include "unicode/prop.h"
#include "unicode/string.h"
#define IS_AHLETTER(cp) ((cp) == WB_LE || (cp) == WB_HL)
#define IS_MIDNUMLETQ(cp) ((cp) == WB_MB || (cp) == WB_SQ)
#define RET(x) \
do { \
ws->prev_ap = ap; \
return (x); \
} while (false)
struct wbrk_state {
int ri_parity;
enum uprop_wb prev_ap;
};
static bool u8iswbrk(const char8_t **, size_t *, struct wbrk_state *);
size_t
u8wnext(struct u8view *w, const char8_t **s, size_t *n)
{
ASSUME(s != nullptr);
ASSUME(n != nullptr);
if (*n == 0)
return 0;
const char8_t *p = *s;
if (w != nullptr)
w->p = p;
size_t m = *n;
struct wbrk_state ws = {};
while (!u8iswbrk(&p, &m, &ws))
;
ptrdiff_t d = p - *s;
*n -= d;
*s = p;
if (w)
w->len = d;
return d;
}
bool
u8iswbrk(const char8_t **s, size_t *n, struct wbrk_state *ws)
{
ASSUME(s != nullptr);
ASSUME(n != nullptr);
ASSUME(ws != nullptr);
rune a, b, c;
enum uprop_wb ap, bp, cp;
a = b = c = ap = bp = cp = 0;
u8next(&a, s, n);
{
const char8_t *s_cpy = *s;
size_t n_cpy = *n;
u8next(&b, &s_cpy, &n_cpy);
u8next(&c, &s_cpy, &n_cpy);
}
ws->ri_parity = ws->ri_parity == 0 && uprop_is_ri(a);
/* WB1 & WB2 */
if (!a || !b)
RET(true);
/* WB3 */
if (a == '\r' && b == '\n')
RET(false);
/* WB3a */
if (a == '\r' || a == '\n' || (ap = uprop_get_wb(a)) == WB_NL)
RET(true);
/* WB3b */
if (b == '\r' || b == '\n' || (bp = uprop_get_wb(b)) == WB_NL)
RET(true);
/* WB3c */
if (ap == WB_ZWJ && uprop_is_extpict(b))
RET(false);
/* WB3d */
if (ap == WB_WSEGSPACE && bp == WB_WSEGSPACE)
RET(false);
/* WB4 */
if (bp == WB_FO || bp == WB_EXTEND || bp == WB_ZWJ)
RET(false);
/* WB5 */
if (IS_AHLETTER(ap) && IS_AHLETTER(bp))
RET(false);
/* WB6 */
cp = uprop_get_wb(c);
if (IS_AHLETTER(ap) && (bp == WB_ML || IS_MIDNUMLETQ(bp))
&& IS_AHLETTER(cp))
{
RET(false);
}
/* WB7 */
if (IS_AHLETTER(ws->prev_ap) && (ap == WB_ML || IS_MIDNUMLETQ(ap))
&& IS_AHLETTER(bp))
{
RET(false);
}
/* WB7a & WB7b */
if (ap == WB_HL && (bp == WB_SQ || (bp == WB_DQ && cp == WB_HL)))
RET(false);
/* WB7c */
if (ws->prev_ap == WB_HL && ap == WB_DQ && bp == WB_HL)
RET(false);
/* WB8, WB9, & WB10 */
if ((ap == WB_NU || IS_AHLETTER(ap)) && (bp == WB_NU || IS_AHLETTER(bp)))
RET(false);
/* WB11 */
if (ws->prev_ap == WB_NU && (ap == WB_MN || IS_MIDNUMLETQ(ap))
&& bp == WB_NU)
{
RET(false);
}
/* WB12 */
if (ap == WB_NU && (bp == WB_MN || IS_MIDNUMLETQ(bp)) && cp == WB_NU)
RET(false);
/* WB13 */
if (ap == WB_KA && bp == WB_KA)
RET(false);
/* WB13a */
if ((IS_AHLETTER(ap) || ap == WB_NU || ap == WB_KA || ap == WB_EX)
&& bp == WB_EX)
{
RET(false);
}
/* WB13b */
if (ap == WB_EX && (IS_AHLETTER(bp) || bp == WB_NU || bp == WB_KA))
RET(false);
/* WB15 & WB16 */
if (ap == WB_RI && bp == WB_RI && ws->ri_parity == 1)
RET(false);
/* WB999 */
RET(true);
}
|
