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#include <stdlib.h>
#include <string.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;
}
size_t text_regex_nsub(Regex *r) {
if (!r)
return 0;
return r->regex.re_nsub;
}
void text_regex_free(Regex *r) {
if (!r)
return;
regfree(&r->regex);
free(r);
}
int text_regex_match(Regex *r, const char *data, int eflags) {
return regexec(&r->regex, data, 0, NULL, eflags);
}
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;
char *cur = buf, *end = buf + len;
int ret = REG_NOMATCH;
regmatch_t match[MAX_REGEX_SUB];
for (size_t junk = len; len > 0; len -= junk, pos += junk) {
ret = regexec(&r->regex, cur, 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;
}
break;
}
char *next = memchr(cur, 0, len);
if (!next)
break;
while (!*next && next != end)
next++;
junk = next - cur;
cur = next;
}
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;
char *cur = buf, *end = buf + len;
int ret = REG_NOMATCH;
regmatch_t match[MAX_REGEX_SUB];
for (size_t junk = len; len > 0; len -= junk, pos += junk) {
char *next;
if (!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 + match[i].rm_so;
pmatch[i].end = match[i].rm_eo == -1 ? EPOS : pos + match[i].rm_eo;
}
if (match[0].rm_so == 0 && match[0].rm_eo == 0) {
/* empty match at the beginning of cur, advance to next line */
next = strchr(cur, '\n');
if (!next)
break;
next++;
} else {
next = cur + match[0].rm_eo;
}
} else {
next = memchr(cur, 0, len);
if (!next)
break;
while (!*next && next != end)
next++;
}
junk = next - cur;
cur = next;
if (cur[-1] == '\n')
eflags &= ~REG_NOTBOL;
else
eflags |= REG_NOTBOL;
}
free(buf);
return ret;
}
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