135 lines
2.7 KiB
C
135 lines
2.7 KiB
C
/*
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* Copyright 2013 (c) Anna Schumaker.
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*/
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#include <core/filter.h>
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#include <core/string.h>
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static GHashTable *filter_index = NULL;
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GHashTable *__filter_copy(GHashTable *set)
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{
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GHashTableIter iter;
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GHashTable *res;
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gpointer data;
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res = g_hash_table_new(g_direct_hash, g_direct_equal);
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g_hash_table_iter_init(&iter, set);
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while (g_hash_table_iter_next(&iter, &data, NULL))
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g_hash_table_add(res, data);
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return res;
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}
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void __filter_inline_intersect(GHashTable *lhs, GHashTable *rhs)
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{
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GHashTableIter iter;
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gpointer data;
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g_hash_table_iter_init(&iter, rhs);
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while (g_hash_table_iter_next(&iter, &data, NULL)) {
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if (!g_hash_table_contains(lhs, data))
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g_hash_table_iter_remove(&iter);
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}
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}
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void filter_init()
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{
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filter_index = g_hash_table_new_full(g_str_hash, g_str_equal, g_free,
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(GDestroyNotify)g_hash_table_destroy);
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}
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void filter_deinit()
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{
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g_hash_table_destroy(filter_index);
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}
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void filter_add(const gchar *text, void *data)
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{
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const gchar *c = g_utf8_next_char(text);
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glong begin, end;
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GHashTable *set;
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gchar *substr;
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for (begin = 0, end = 1; end <= g_utf8_strlen(text, -1); end++) {
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substr = g_utf8_substring(text, begin, end);
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set = g_hash_table_lookup(filter_index, substr);
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if (!set) {
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set = g_hash_table_new(g_direct_hash, g_direct_equal);
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g_hash_table_insert(filter_index, substr, set);
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}
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g_hash_table_add(set, data);
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if (g_unichar_isspace(g_utf8_get_char(c))) {
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c = g_utf8_next_char(c);
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begin = ++end;
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}
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c = g_utf8_next_char(c);
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}
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}
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void filter_remove(const gchar *text, void *data)
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{
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const gchar *c = g_utf8_next_char(text);
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glong begin, end;
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GHashTable *set;
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gchar *substr;
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for (begin = 0, end = 1; end <= g_utf8_strlen(text, -1); end++) {
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substr = g_utf8_substring(text, begin, end);
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set = g_hash_table_lookup(filter_index, substr);
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if (set)
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g_hash_table_remove(set, data);
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if (g_unichar_isspace(g_utf8_get_char(c))) {
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c = g_utf8_next_char(c);
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begin = ++end;
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}
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c = g_utf8_next_char(c);
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}
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}
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GHashTable *filter_search(const gchar *text)
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{
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gchar *lower = string_lowercase(text);
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GHashTable *found, *res = NULL;
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glong begin, end;
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gchar *c, *substr;
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c = lower;
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for (begin = 0, end = 1; end <= g_utf8_strlen(lower, -1); end++) {
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c = g_utf8_next_char(c);
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if ((*c != '\0') && !g_unichar_isspace(g_utf8_get_char(c)))
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continue;
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substr = g_utf8_substring(lower, begin, end);
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found = g_hash_table_lookup(filter_index, substr);
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g_free(substr);
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if (!found) {
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g_hash_table_destroy(res);
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res = NULL;
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break;
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}
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if (!res)
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res = __filter_copy(found);
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else
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__filter_inline_intersect(found, res);
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c = g_utf8_next_char(c);
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begin = ++end;
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}
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g_free(lower);
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return res;
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}
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