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/*
* blogc: A blog compiler.
* Copyright (C) 2014-2015 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /* HAVE_CONFIG_H */
#include <stdlib.h>
#include "utils.h"
b_trie_t*
b_trie_new(b_free_func_t free_func)
{
b_trie_t *trie = b_malloc(sizeof(b_trie_t));
trie->root = NULL;
trie->free_func = free_func;
return trie;
}
static void
b_trie_free_node(b_trie_t *trie, b_trie_node_t *node)
{
if (node == NULL)
return;
if (node->data != NULL && trie->free_func != NULL)
trie->free_func(node->data);
b_trie_free_node(trie, node->next);
b_trie_free_node(trie, node->child);
free(node);
}
void
b_trie_free(b_trie_t *trie)
{
if (trie == NULL)
return;
b_trie_free_node(trie, trie->root);
free(trie);
}
void
b_trie_insert(b_trie_t *trie, const char *key, void *data)
{
if (data == NULL || key == NULL)
return;
b_trie_node_t *parent = NULL;
b_trie_node_t *previous;
b_trie_node_t *current;
b_trie_node_t *tmp;
while (1) {
if (trie->root == NULL || (parent != NULL && parent->child == NULL)) {
current = b_malloc(sizeof(b_trie_node_t));
current->key = *key;
current->data = NULL;
current->next = NULL;
current->child = NULL;
if (trie->root == NULL)
trie->root = current;
else
parent->child = current;
parent = current;
goto clean;
}
tmp = parent == NULL ? trie->root : parent->child;
previous = NULL;
while (tmp != NULL && tmp->key != *key) {
previous = tmp;
tmp = tmp->next;
}
parent = tmp;
if (previous == NULL || parent != NULL)
goto clean;
current = b_malloc(sizeof(b_trie_node_t));
current->key = *key;
current->data = NULL;
current->next = NULL;
current->child = NULL;
previous->next = current;
parent = current;
clean:
if (*key == '\0') {
if (parent->data != NULL && trie->free_func != NULL)
trie->free_func(parent->data);
parent->data = data;
break;
}
key++;
}
}
void*
b_trie_lookup(b_trie_t *trie, const char *key)
{
if (trie == NULL || trie->root == NULL || key == NULL)
return NULL;
b_trie_node_t *parent = trie->root;
b_trie_node_t *tmp;
while (1) {
for (tmp = parent; tmp != NULL; tmp = tmp->next) {
if (tmp->key == *key) {
if (tmp->key == '\0')
return tmp->data;
parent = tmp->child;
break;
}
}
if (tmp == NULL)
return NULL;
if (*key == '\0')
break;
key++;
}
return NULL;
}
static void
b_trie_size_node(b_trie_node_t *node, unsigned int *count)
{
if (node == NULL)
return;
if (node->key == '\0')
(*count)++;
b_trie_size_node(node->next, count);
b_trie_size_node(node->child, count);
}
unsigned int
b_trie_size(b_trie_t *trie)
{
if (trie == NULL)
return 0;
unsigned int count = 0;
b_trie_size_node(trie->root, &count);
return count;
}
static void
b_trie_foreach_node(b_trie_node_t *node, b_string_t *str, void (*func)(const char *key, void *data))
{
if (node == NULL)
return;
if (node->key == '\0') {
func(str->str, node->data);
b_string_free(str, true);
}
if (node->child != NULL) {
b_string_t *child = b_string_new();
child = b_string_append(child, str->str);
child = b_string_append_c(child, node->key);
b_trie_foreach_node(node->child, child, func);
}
if (node->next != NULL)
b_trie_foreach_node(node->next, str, func);
if (node->child != NULL && node->next == NULL)
b_string_free(str, true);
}
void
b_trie_foreach(b_trie_t *trie, void (*func)(const char *key, void *data))
{
if (trie->root == NULL)
return;
b_string_t *str = b_string_new();
b_trie_foreach_node(trie->root, str, func);
}
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