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
|
#include <u.h>
#include <libc.h>
#include <libg.h>
#include <frame.h>
#include <text.h>
static Rune l1[] = { '{', '[', '(', '<', 0253, 0};
static Rune l2[] = { '\n', 0};
static Rune l3[] = { '\'', '"', '`', 0};
Rune *left[]= { l1, l2, l3, 0};
static Rune r1[] = {'}', ']', ')', '>', 0273, 0};
static Rune r2[] = {'\n', 0};
static Rune r3[] = {'\'', '"', '`', 0};
Rune *right[]= { r1, r2, r3, 0};
static ulong cp;
static int
wgetc(Text *t)
{
if(cp < t->length)
return t->text[cp++];
return 0;
}
static int
wbgetc(Text *t)
{
if(cp > 0)
return t->text[--cp];
return 0;
}
static Rune *
strrune(Rune *s, Rune c)
{
Rune c1;
if(c == 0) {
while(*s++)
;
return s-1;
}
while(c1 = *s++)
if(c1 == c)
return s-1;
return 0;
}
static int
clickmatch(Text *t, int cl, int cr, int dir)
{
int c, nest;
nest=1;
while((c=(dir>0? wgetc(t) : wbgetc(t))) > 0) {
if(cl=='\n' && c==0x04) /* EOT is trouble */
return 1;
if(c == cr){
if(--nest == 0)
return 1;
}else if(c == cl)
nest++;
}
return cl=='\n' && nest==1;
}
void
doubleclick(Text *t, ulong p0)
{
int c, i;
Rune *r, *l;
t->p0 = t->p1 = p0;
for(i=0; left[i]; i++){
l = left[i];
r = right[i];
/* try left match */
if(p0 == 0){
cp = p0;
c = '\n';
}else{
cp = p0-1;
c = wgetc(t);
}
if(strrune(l, c)){
if(clickmatch(t, c, r[strrune(l, c)-l], 1)){
t->p0 = p0;
t->p1 = cp-1;
if(c=='\n' && (cp--,wgetc(t))!=0x04) /* EOT is trouble */
t->p1++;
}
return;
}
/* try right match */
if(p0 == t->length){
cp = p0;
c='\n';
}else{
cp = p0+1;
c = wbgetc(t);
}
if(strrune(r, c)){
if(clickmatch(t, c, l[strrune(r, c)-r], -1)){
t->p0 = cp;
if(c!='\n' || cp!=0 || (cp=0,wgetc(t))=='\n')
t->p0++;
t->p1 = p0+(p0<t->length && c=='\n');
}
return;
}
}
/* try filling out word to right */
cp = p0;
while(alnum(wgetc(t)))
t->p1++;
/* try filling out word to left */
cp = p0;
while(alnum(wbgetc(t)))
t->p0--;
}
int
alnum(int c)
{
/*
* Hard to get absolutely right. Use what we know about ASCII
* and assume anything above the Latin control characters is
* potentially an alphanumeric.
*/
if(c <= ' ')
return 0;
if(0x7F<=c && c<=0xA0)
return 0;
if(utfrune("!\"#$%&'()*+,-./:;<=>?@`[\\]^{|}~", c))
return 0;
return 1;
}
|
