snac2/xs_regex.h

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/* copyright (c) 2022 grunfink - MIT license */
#ifndef _XS_REGEX_H
#define _XS_REGEX_H
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d_char *xs_regex_split_n(const char *str, const char *rx, int count);
#define xs_regex_split(str, rx) xs_regex_split_n(str, rx, 0xfffffff)
d_char *xs_regex_match_n(const char *str, const char *rx, int count);
#define xs_regex_match(str, rx) xs_regex_match_n(str, rx, 0xfffffff)
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#ifdef XS_IMPLEMENTATION
#include <regex.h>
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d_char *xs_regex_split_n(const char *str, const char *rx, int count)
/* splits str by regex */
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{
regex_t re;
regmatch_t rm;
int offset = 0;
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d_char *list = NULL;
const char *p;
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if (regcomp(&re, rx, REG_EXTENDED))
return NULL;
list = xs_list_new();
while (count > 0 && !regexec(&re, (p = str + offset), 1, &rm, offset > 0 ? REG_NOTBOL : 0)) {
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/* add first the leading part of the string */
list = xs_list_append_m(list, p, rm.rm_so);
list = xs_str_cat(list, "");
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/* add now the matched text as the separator */
list = xs_list_append_m(list, p + rm.rm_so, rm.rm_eo - rm.rm_so);
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list = xs_str_cat(list, "");
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/* move forward */
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offset += rm.rm_eo;
count--;
}
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/* add the rest of the string */
list = xs_list_append(list, p);
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regfree(&re);
return list;
}
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d_char *xs_regex_match_n(const char *str, const char *rx, int count)
/* returns a list with upto count matches */
{
d_char *list = xs_list_new();
xs *split = NULL;
char *p, *v;
int n = 0;
/* split */
p = split = xs_regex_split_n(str, rx, count);
/* now iterate to get only the 'separators' (odd ones) */
while (xs_list_iter(&p, &v)) {
if (n & 0x1)
list = xs_list_append(list, v);
n++;
}
return list;
}
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#endif /* XS_IMPLEMENTATION */
#endif /* XS_REGEX_H */