void _trie_node_delete_path(ktrie_node_t* node, const char* s) {
char c = 0;
char n = 0;
verify(node);
verify(s);
c = *s;
if (node->key == c) {
s += 1;
n = *s;
if (!n) {
return;
}
if (node->center) {
_trie_node_delete_path(node->center, s);
_trie_node_destroy_self(node->center, 0);
node->center = 0;
}
} else if (node->key > c) {
if (node->left) {
_trie_node_delete_path(node->left, s);
_trie_node_destroy_self(node->left, 0);
node->left = 0;
}
} else if (node->key < c) {
if (node->right) {
_trie_node_delete_path(node->right, s);
_trie_node_destroy_self(node->right, 0);
node->right = 0;
}
}
}
int _trie_node_remove(ktrie_node_t* node, const char* s, void** value) {
int error = error_ok;
ktrie_node_t* start_node = 0;
verify(node);
verify(s);
error = _trie_node_find(node, s, s, value);
if (error_ok != error) {
return error;
}
/* 减少路径引用计数 */
if (_trie_node_decref_path(node, &start_node, s)) {
/* 销毁路径 */
_trie_node_delete_path(start_node, s);
if (start_node->parent) { /* 非根节点 */
if (start_node->parent->left == start_node) {
start_node->parent->left = 0;
_trie_node_destroy_self(start_node, 0);
} else if (start_node->parent->right == start_node) {
start_node->parent->right = 0;
_trie_node_destroy_self(start_node, 0);
} else if (start_node->parent->center == start_node) {
start_node->parent->center = 0;
_trie_node_destroy_self(start_node, 0);
}
} else {
/* 根节点 */
_trie_node_reset(start_node);
}
}
return error;
}
int _trie_node_remove(ktrie_node_t* node, const char* s, void** value) {
int error = error_ok;
ktrie_node_t* start_node = 0;
ktrie_node_t* parent_node = 0;
verify(node);
verify(s);
error = _trie_node_find(node, s, s, value);
if (error_ok != error) {
return error;
}
/* 减少路径引用计数 */
if (_trie_node_decref_path(node, &start_node, s)) {
/* 销毁路径 */
_trie_node_delete_path(start_node, s);
if (_trie_node_check_orphan(start_node)) {
_trie_node_destroy_self(start_node, 0);
}
start_node = 0;
}
if (start_node) {
/* 使当前节点无效 */
destroy(start_node->real_key);
start_node->real_key = 0;
while (start_node && _trie_node_check_orphan(start_node)) {
parent_node = start_node->parent;
_trie_node_destroy_self(start_node, 0);
start_node = parent_node;
}
}
return error;
}
