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
|
#include <stdlib.h>
#include <regex.h>
#include "text-regex.h"
struct Regex {
regex_t regex;
};
Regex *text_regex_new(void) {
Regex *r = calloc(1, sizeof(Regex));
if (!r)
return NULL;
regcomp(&r->regex, "\0\0", 0); /* this should not match anything */
return r;
}
int text_regex_compile(Regex *regex, const char *string, int cflags) {
int r = regcomp(®ex->regex, string, cflags);
if (r)
regcomp(®ex->regex, "\0\0", 0);
return r;
}
void text_regex_free(Regex *r) {
if (!r)
return;
regfree(&r->regex);
free(r);
}
int text_search_range_forward(Text *txt, size_t pos, size_t len, Regex *r, size_t nmatch, RegexMatch pmatch[], int eflags) {
char *buf = text_bytes_alloc0(txt, pos, len);
if (!buf)
return REG_NOMATCH;
regmatch_t match[nmatch];
int ret = regexec(&r->regex, buf, nmatch, match, eflags);
if (!ret) {
for (size_t i = 0; i < nmatch; i++) {
pmatch[i].start = match[i].rm_so == -1 ? EPOS : pos + match[i].rm_so;
pmatch[i].end = match[i].rm_eo == -1 ? EPOS : pos + match[i].rm_eo;
}
}
free(buf);
return ret;
}
int text_search_range_backward(Text *txt, size_t pos, size_t len, Regex *r, size_t nmatch, RegexMatch pmatch[], int eflags) {
char *buf = text_bytes_alloc0(txt, pos, len);
if (!buf)
return REG_NOMATCH;
regmatch_t match[nmatch];
char *cur = buf;
int ret = REG_NOMATCH;
while (!regexec(&r->regex, cur, nmatch, match, eflags)) {
ret = 0;
for (size_t i = 0; i < nmatch; i++) {
pmatch[i].start = match[i].rm_so == -1 ? EPOS : pos + (size_t)(cur - buf) + match[i].rm_so;
pmatch[i].end = match[i].rm_eo == -1 ? EPOS : pos + (size_t)(cur - buf) + match[i].rm_eo;
}
cur += match[0].rm_eo;
}
free(buf);
return ret;
}
|
