82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
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#include <math.h>
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int
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compare_distance(const void *a, const void *b)
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{
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struct item *da = *(struct item **) a;
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struct item *db = *(struct item **) b;
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if (!db)
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return 1;
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if (!da)
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return -1;
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return da->distance == db->distance ? 0 : da->distance < db->distance ? -1 : 1;
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}
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void
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fuzzymatch(void)
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{
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/* bang - we have so much memory */
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struct item *it;
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struct item **fuzzymatches = NULL;
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char c;
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int number_of_matches = 0, i, pidx, sidx, eidx;
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int text_len = strlen(text), itext_len;
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matches = matchend = NULL;
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/* walk through all items */
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for (it = items; it && it->text; it++) {
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if (text_len) {
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itext_len = strlen(it->text);
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pidx = 0; /* pointer */
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sidx = eidx = -1; /* start of match, end of match */
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/* walk through item text */
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for (i = 0; i < itext_len && (c = it->text[i]); i++) {
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/* fuzzy match pattern */
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if (!fstrncmp(&text[pidx], &c, 1)) {
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if (sidx == -1)
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sidx = i;
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pidx++;
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if (pidx == text_len) {
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eidx = i;
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break;
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}
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}
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}
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/* build list of matches */
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if (eidx != -1) {
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/* compute distance */
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/* add penalty if match starts late (log(sidx+2))
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* add penalty for long a match without many matching characters */
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it->distance = log(sidx + 2) + (double)(eidx - sidx - text_len);
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/* fprintf(stderr, "distance %s %f\n", it->text, it->distance); */
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appenditem(it, &matches, &matchend);
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number_of_matches++;
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}
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} else {
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appenditem(it, &matches, &matchend);
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}
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}
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if (number_of_matches) {
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/* initialize array with matches */
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if (!(fuzzymatches = realloc(fuzzymatches, number_of_matches * sizeof(struct item*))))
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die("cannot realloc %u bytes:", number_of_matches * sizeof(struct item*));
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for (i = 0, it = matches; it && i < number_of_matches; i++, it = it->right) {
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fuzzymatches[i] = it;
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}
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/* sort matches according to distance */
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qsort(fuzzymatches, number_of_matches, sizeof(struct item*), compare_distance);
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/* rebuild list of matches */
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matches = matchend = NULL;
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for (i = 0, it = fuzzymatches[i]; i < number_of_matches && it && \
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it->text; i++, it = fuzzymatches[i]) {
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appenditem(it, &matches, &matchend);
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}
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free(fuzzymatches);
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}
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curr = sel = matches;
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calcoffsets();
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}
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