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80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/* copyright (c) 2022 - 2023 grunfink / MIT license */
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#ifndef _XS_REGEX_H
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#define _XS_REGEX_H
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xs_list *xs_regex_split_n(const char *str, const char *rx, int count);
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#define xs_regex_split(str, rx) xs_regex_split_n(str, rx, XS_ALL)
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xs_list *xs_regex_match_n(const char *str, const char *rx, int count);
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#define xs_regex_match(str, rx) xs_regex_match_n(str, rx, XS_ALL)
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#ifdef XS_IMPLEMENTATION
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#include <regex.h>
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xs_list *xs_regex_split_n(const char *str, const char *rx, int count)
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/* splits str by regex */
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{
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regex_t re;
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regmatch_t rm;
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int offset = 0;
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xs_list *list = NULL;
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const char *p;
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if (regcomp(&re, rx, REG_EXTENDED))
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return NULL;
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list = xs_list_new();
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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 */
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list = xs_list_append_m(list, p, rm.rm_so);
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list = xs_insert_m(list, xs_size(list) - 1, "", 1);
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/* add now the matched text as the separator */
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list = xs_list_append_m(list, p + rm.rm_so, rm.rm_eo - rm.rm_so);
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list = xs_insert_m(list, xs_size(list) - 1, "", 1);
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/* move forward */
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offset += rm.rm_eo;
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count--;
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}
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/* add the rest of the string */
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list = xs_list_append(list, p);
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regfree(&re);
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return list;
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}
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xs_list *xs_regex_match_n(const char *str, const char *rx, int count)
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/* returns a list with upto count matches */
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{
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xs_list *list = xs_list_new();
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xs *split = NULL;
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xs_list *p;
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xs_val *v;
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int n = 0;
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/* split */
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split = xs_regex_split_n(str, rx, count);
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/* now iterate to get only the 'separators' (odd ones) */
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p = split;
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while (xs_list_iter(&p, &v)) {
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if (n & 0x1)
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list = xs_list_append(list, v);
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n++;
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}
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return list;
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}
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#endif /* XS_IMPLEMENTATION */
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#endif /* XS_REGEX_H */
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