mirror of https://codeberg.org/grunfink/snac2.git
134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/* copyright (c) 2022 - 2024 grunfink et al. / 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_select_n(const char *str, const char *rx, int count);
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#define xs_regex_select(str, rx) xs_regex_select_n(str, rx, XS_ALL)
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xs_list *xs_regex_replace_in(xs_str *str, const char *rx, const char *rep, int count);
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#define xs_regex_replace_i(str, rx, rep) xs_regex_replace_in(str, rx, rep, XS_ALL)
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#define xs_regex_replace_n(str, rx, rep, count) xs_regex_replace_in(xs_dup(str), rx, rep, count)
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#define xs_regex_replace(str, rx, rep) xs_regex_replace_in(xs_dup(str), rx, rep, 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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xs *s1 = xs_str_new_sz(p, rm.rm_so);
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list = xs_list_append(list, s1);
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/* add now the matched text as the separator */
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xs *s2 = xs_str_new_sz(p + rm.rm_so, rm.rm_eo - rm.rm_so);
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list = xs_list_append(list, s2);
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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_select_n(const char *str, const char *rx, int count)
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/* selects all matches and return them as a list */
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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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xs_list *xs_regex_replace_in(xs_str *str, const char *rx, const char *rep, int count)
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/* replaces all matches with the rep string. If it contains unescaped &,
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they are replaced with the match */
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{
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xs_str *s = xs_str_new(NULL);
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xs *split = xs_regex_split_n(str, rx, count);
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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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int pholder = !!strchr(rep, '&');
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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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if (pholder) {
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/* rep has a placeholder; process char by char */
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const char *p = rep;
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while (*p) {
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if (*p == '&')
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s = xs_str_cat(s, v);
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else {
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if (*p == '\\')
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p++;
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if (!*p)
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break;
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s = xs_append_m(s, p, 1);
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}
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p++;
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}
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}
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else
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s = xs_str_cat(s, rep);
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}
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else
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s = xs_str_cat(s, v);
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n++;
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}
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xs_free(str);
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return s;
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}
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#endif /* XS_IMPLEMENTATION */
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#endif /* XS_REGEX_H */
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