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/***************************************************************************
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trie_dict.c - description
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-------------------
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Copyright : (C) 2004-2025 by Leaflet
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Email : leaflet@leafok.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 3 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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#include "trie_dict.h"
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#include <stdlib.h>
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#include <stdio.h>
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inline int char_to_offset(char c)
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{
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return (unsigned char)c;
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}
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char offset_to_char(int i)
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{
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if (i > 255)
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{
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return '\0';
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}
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return (char)(i % 256 - 256);
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}
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TRIE_NODE *trie_dict_create(void)
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{
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TRIE_NODE *p_dict;
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p_dict = (TRIE_NODE *)calloc(1, sizeof(TRIE_NODE));
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return p_dict;
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}
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void trie_dict_destroy(TRIE_NODE *p_dict)
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{
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if (p_dict == NULL)
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{
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return;
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}
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for (int i = 0; i < TRIE_CHILDREN; i++)
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{
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if (p_dict->p_nodes[i] != NULL)
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{
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trie_dict_destroy(p_dict->p_nodes[i]);
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}
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p_dict->flags[i] = 0;
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}
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free(p_dict);
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p_dict = NULL;
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}
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int trie_dict_set(TRIE_NODE *p_dict, const char *key, int64_t value)
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{
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int offset;
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while (key != NULL && *key != '\0')
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{
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offset = char_to_offset(*key);
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if (offset < 0 || offset >= TRIE_CHILDREN) // incorrect key character
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{
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return -1;
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}
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if (*(key + 1) == '\0')
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{
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if (p_dict->flags[offset] == 0 || p_dict->values[offset] != value)
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{
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p_dict->values[offset] = value;
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p_dict->flags[offset] = 1;
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return 1; // Set to new value
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}
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return 0; // Unchanged
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}
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else
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{
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if (p_dict->p_nodes[offset] == NULL)
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{
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if ((p_dict->p_nodes[offset] = trie_dict_create()) == NULL)
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{
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return -2; // OOM
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}
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}
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p_dict = p_dict->p_nodes[offset];
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key++;
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}
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}
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return -1; // NULL key
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}
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int trie_dict_get(TRIE_NODE *p_dict, const char *key, int64_t *p_value)
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{
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int offset;
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while (key != NULL && *key != '\0')
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{
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offset = char_to_offset(*key);
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if (offset < 0 || offset >= TRIE_CHILDREN) // incorrect key character
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{
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return -1;
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}
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if (*(key + 1) == '\0')
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{
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if (p_dict->flags[offset] != 0)
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{
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*p_value = p_dict->values[offset];
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return 1; // Found
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}
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else
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{
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return 0; // Not exist
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}
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}
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else if (p_dict->p_nodes[offset] == NULL)
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{
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return 0; // Not exist
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}
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else
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{
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p_dict = p_dict->p_nodes[offset];
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key++;
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}
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}
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return -1; // NULL key
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}
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int trie_dict_del(TRIE_NODE *p_dict, const char *key)
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{
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int offset;
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while (key != NULL && *key != '\0')
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{
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offset = char_to_offset(*key);
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if (offset < 0 || offset >= TRIE_CHILDREN) // incorrect key character
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{
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return -1;
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}
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if (*(key + 1) == '\0')
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{
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if (p_dict->flags[offset] != 0)
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{
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p_dict->flags[offset] = 0;
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p_dict->values[offset] = 0;
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return 1; // Done
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}
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else
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{
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return 0; // Not exist
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}
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}
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else if (p_dict->p_nodes[offset] == NULL)
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{
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return 0; // Not exist
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}
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else
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{
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p_dict = p_dict->p_nodes[offset];
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key++;
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}
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}
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return -1; // NULL key
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}
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static void _trie_dict_traverse(TRIE_NODE *p_dict, trie_dict_traverse_cb cb, char *key, int depth)
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{
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if (p_dict == NULL || depth >= TRIE_MAX_KEY_LEN)
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{
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return;
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}
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for (int i = 0; i < TRIE_CHILDREN; i++)
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{
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if (p_dict->flags[i] != 0)
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{
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key[depth] = offset_to_char(i);
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key[depth + 1] = '\0';
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(*cb)(key, p_dict->values[i]);
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}
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if (p_dict->p_nodes[i] != NULL && depth + 1 < TRIE_MAX_KEY_LEN)
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{
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key[depth] = offset_to_char(i);
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_trie_dict_traverse(p_dict->p_nodes[i], cb, key, depth + 1);
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}
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}
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}
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void trie_dict_traverse(TRIE_NODE *p_dict, trie_dict_traverse_cb cb)
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{
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char key[TRIE_MAX_KEY_LEN + 1];
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key[0] = '\0';
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_trie_dict_traverse(p_dict, cb, key, 0);
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}
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