66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
#ifndef LIBABACUS_TRIE_H
|
|
#define LIBABACUS_TRIE_H
|
|
|
|
#include "ll.h"
|
|
#include "result.h"
|
|
|
|
/**
|
|
* A node in the trie.
|
|
*/
|
|
struct libab_trie_node_s {
|
|
/**
|
|
* The "child" node, which points
|
|
* to the next layer of the trie, housing
|
|
* children that have a prefix ending in this node's key value.
|
|
*/
|
|
struct libab_trie_node_s* child;
|
|
/**
|
|
* The "next" node, which points
|
|
* to the sibiling of this tree, wich has the same prefix
|
|
* as this node.
|
|
*/
|
|
struct libab_trie_node_s* next;
|
|
/**
|
|
* The values associated with the key ending with
|
|
* this node's key value.
|
|
*/
|
|
ll values;
|
|
/**
|
|
* The last letter of the key, which this node represents.
|
|
* The remainder of the key is encoded in nodes preceding this one.
|
|
*/
|
|
char key;
|
|
};
|
|
|
|
/**
|
|
* A struct that represents a trie.
|
|
*/
|
|
struct libab_trie_s {
|
|
/**
|
|
* The first search node in this trie.
|
|
*/
|
|
struct libab_trie_node_s* head;
|
|
/**
|
|
* The empty list returned if no value is found.
|
|
* Note that existing nodes return their own linked
|
|
* list of values, even if empty. However, for keys
|
|
* that don't exist as prefixes in the trie,
|
|
* this list is returned to maintain consistency:
|
|
* a list is always returned containing the values
|
|
* of the trie associated with the given key.
|
|
*/
|
|
ll empty_list;
|
|
};
|
|
|
|
typedef struct libab_trie_s libab_trie;
|
|
typedef struct libab_trie_node_s libab_trie_node;
|
|
|
|
void libab_trie_init(libab_trie* trie);
|
|
libab_result libab_trie_put(libab_trie* trie, const char* key, void* value);
|
|
const ll* libab_trie_get(const libab_trie* trie, const char* key);
|
|
int libab_trie_foreach(const libab_trie* trie, void* data, compare_func compare,
|
|
foreach_func foreach);
|
|
void libab_trie_free(libab_trie* trie);
|
|
|
|
#endif
|