764 lines
16 KiB
C
764 lines
16 KiB
C
/*
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* c_avltree.c - AvlTree class
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*
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* Copyright (C) 2013 Tobias Boege <tobias@gambas-buch.de>
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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 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#define __C_AVLTREE_C
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#include <assert.h>
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#include "gambas.h"
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#include "gb_common.h"
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#include "string_compare.h"
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#include "c_avltree.h"
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typedef struct node NODE;
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struct node {
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char *key; /* Key string */
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size_t length; /* Key length */
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int balance; /* Balance value in {-1, 0, 1} */
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NODE *left, *right; /* Children or NULL */
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NODE *parent; /* Parent */
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GB_VARIANT_VALUE val; /* Payload */
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};
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typedef struct {
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GB_BASE ob;
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NODE *root; /* The root of the tree */
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NODE *last; /* Last used node */
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size_t count; /* Element count */
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size_t height; /* Tree height */
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} CAVLTREE;
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static void CAVLTREE_init(CAVLTREE *tree)
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{
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tree->root = tree->last = NULL;
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tree->count = tree->height = 0;
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}
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/* In-order. */
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static NODE *CAVLTREE_next(CAVLTREE *tree, NODE *node)
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{
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NODE *next;
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if ((next = node->right)) {
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while (next->left)
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next = next->left;
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return next;
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}
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for (next = node->parent; node == next->right; next = next->parent)
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node = next;
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/* This condition is only met when climing from the right subtree to
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* root in the above loop. We're done then. */
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if (node == next)
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return NULL;
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return next;
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}
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static NODE *NODE_new(NODE *parent, char *key, size_t length)
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{
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NODE *node;
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GB.Alloc((void **) &node, sizeof(*node));
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node->key = GB.NewString(key, length);
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node->length = length;
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node->balance = 0;
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node->left = node->right = NULL;
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/* If 'parent' is NULL, this shall be its own parent */
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node->parent = parent ? : node;
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node->val.type = GB_T_NULL;
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return node;
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}
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static void NODE_destroy(NODE *node)
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{
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GB.FreeString(&node->key);
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GB.StoreVariant(NULL, &node->val);
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GB.Free((void **) &node);
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}
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static NODE *CAVLTREE_first(CAVLTREE *tree)
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{
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NODE *first = tree->root;
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if (!first)
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return NULL;
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while (first->left)
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first = first->left;
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return first;
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}
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#define THIS ((CAVLTREE *) _object)
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/**G
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* Create a new, empty AvlTree.
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**/
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BEGIN_METHOD_VOID(AvlTree_new)
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CAVLTREE_init(THIS);
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END_METHOD
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struct enum_state {
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int started;
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NODE *next;
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};
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static void CAVLTREE_clear(CAVLTREE *tree)
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{
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NODE *node = CAVLTREE_first(tree);
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while (node)
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{
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NODE_destroy(node);
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node = CAVLTREE_next(tree, node);
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}
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/* Fix enumerators */
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void *ebuf;
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struct enum_state *state;
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ebuf = GB.BeginEnum(tree);
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while (!GB.NextEnum()) {
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state = GB.GetEnum();
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state->next = NULL;
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}
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GB.EndEnum(ebuf);
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tree->root = tree->last = NULL;
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tree->count = 0;
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tree->height = 0;
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}
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/**G
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* Clears the tree automatically.
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**/
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BEGIN_METHOD_VOID(AvlTree_free)
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CAVLTREE_clear(THIS);
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END_METHOD
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static NODE *CAVLTREE_find(CAVLTREE *tree, char *key, size_t length)
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{
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NODE *node = tree->root;
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int res;
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while (node) {
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res = STRING_compare(key, length, node->key, node->length);
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if (!res)
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return node;
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else if (res < 0)
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node = node->left;
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else
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node = node->right;
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}
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return NULL;
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}
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/**G
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* Return the value associated with the given key. If no node with this key
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* was found, Null is returned.
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**/
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BEGIN_METHOD(AvlTree_get, GB_STRING key)
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NODE *node;
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node = CAVLTREE_find(THIS, STRING(key), LENGTH(key));
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THIS->last = node;
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if (!node) {
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GB.ReturnNull();
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return;
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}
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GB.ReturnVariant(&node->val);
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END_METHOD
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#if 0
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/* Reverse in-order */
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static NODE *CAVLTREE_prev(CAVLTREE *tree, NODE *node)
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{
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NODE *prev;
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if ((prev = node->left)) {
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while (prev->right)
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prev = prev->right;
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return prev;
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}
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for (prev = node->parent; node == prev->left; prev = prev->parent)
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node = prev;
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if (node == prev)
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return NULL;
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return prev;
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}
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#endif
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static inline void rotate_left(CAVLTREE *tree, NODE *rot)
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{
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NODE *right = rot->right, *parent = rot->parent;
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if (rot == tree->root) {
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tree->root = right;
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/* Don't forget to add the root signature */
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right->parent = right;
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} else {
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if (rot == parent->left)
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parent->left = right;
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else
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parent->right = right;
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right->parent = parent;
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}
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rot->parent = right;
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rot->right = right->left;
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if (rot->right)
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rot->right->parent = rot;
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right->left = rot;
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}
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static inline void rotate_right(CAVLTREE *tree, NODE *rot)
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{
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NODE *left = rot->left, *parent = rot->parent;
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if (rot == tree->root) {
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tree->root = left;
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left->parent = left;
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} else {
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if (rot == parent->left)
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parent->left = left;
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else
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parent->right = left;
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left->parent = parent;
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}
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rot->parent = left;
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rot->left = left->right;
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if (rot->left)
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rot->left->parent = rot;
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left->right = rot;
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}
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#define sgn(x) \
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({ \
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typeof(x) __x = (x); \
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__x ? (__x < 0 ? -1 : 1) : 0; \
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})
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static NODE *CAVLTREE_find_add(CAVLTREE *tree, char *key, size_t length)
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{
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NODE *node, *parent, *reb, *rot, *new;
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int res;
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/* Make GCC happy */
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parent = NULL;
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res = 0;
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/* Slightly extended version of NODE_find() which gathers additional
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* data for insertion. I'd like to have them separate. */
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reb = node = tree->root;
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while (node) {
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res = STRING_compare(key, length, node->key, node->length);
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if (!res)
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return node;
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if (node->balance)
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reb = node;
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parent = node;
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if (res < 0)
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node = node->left;
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else
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node = node->right;
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}
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res = sgn(res);
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new = node = NODE_new(parent, key, length);
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tree->count++;
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/* Fix enumerations, pt. I: empty tree */
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void *ebuf;
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struct enum_state *state;
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if (!tree->root) {
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tree->root = node;
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tree->height++;
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ebuf = GB.BeginEnum(tree);
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while (!GB.NextEnum()) {
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state = GB.GetEnum();
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state->next = node;
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}
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GB.EndEnum(ebuf);
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return node;
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}
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if (res == -1)
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parent->left = node;
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else
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parent->right = node;
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/* Fix enumerators, pt. II: all other cases */
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ebuf = GB.BeginEnum(tree);
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while (!GB.NextEnum()) {
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state = GB.GetEnum();
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/*
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* Nasty. If a new element is inserted before the current
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* state->next OR state->next is NULL and a new last
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* element is added, update the state.
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*/
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if (state->next == parent
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|| (!state->next && !CAVLTREE_next(tree, new)))
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state->next = new;
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}
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GB.EndEnum(ebuf);
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/* Adjust balance factors */
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while (node != reb) {
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if (node == parent->left)
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parent->balance--;
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else
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parent->balance++;
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node = parent;
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parent = parent->parent;
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}
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/* Rebalance the tree */
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switch (reb->balance) {
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case 1:
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case -1:
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tree->height++;
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break;
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case 2: /* Right heavy */
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rot = reb->right;
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if (rot->balance == 1) { /* Right-right */
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reb->balance = 0;
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rot->balance = 0;
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} else { /* Right-left */
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switch (rot->left->balance) {
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case 1:
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reb->balance = -1;
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rot->balance = 0;
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break;
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case 0:
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reb->balance = 0;
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rot->balance = 0;
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break;
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case -1:
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reb->balance = 0;
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rot->balance = 1;
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break;
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}
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rot->left->balance = 0;
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rotate_right(tree, rot);
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}
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rotate_left(tree, reb);
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break;
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case -2: /* Left heavy */
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rot = reb->left;
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if (rot->balance == -1) { /* Left-left */
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reb->balance = 0;
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rot->balance = 0;
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} else { /* Left-right */
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switch (rot->right->balance) {
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case 1:
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reb->balance = 0;
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rot->balance = -1;
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break;
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case 0:
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reb->balance = 0;
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rot->balance = 0;
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break;
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case -1:
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reb->balance = 1;
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rot->balance = 0;
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break;
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}
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rot->right->balance = 0;
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rotate_left(tree, rot);
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}
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rotate_right(tree, reb);
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break;
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}
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return new;
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}
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#ifdef DEBUG_ME
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static void dump_node(NODE *node)
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{
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fprintf(stderr, "%p \"%s\" (parent=%p \"%s\", left=%p \"%s\", "
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"right=%p \"%s\") balance=%d\n", node, node->key,
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node->parent, node->parent->key, node->left,
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node->left ? node->left->key : "", node->right,
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node->right ? node->right->key : "", node->balance);
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if (node->left)
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dump_node(node->left);
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if (node->right)
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dump_node(node->right);
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}
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#endif
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static void CAVLTREE_remove(CAVLTREE *tree, char *key, size_t length)
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{
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NODE *node, *rep, *child, *reb;
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int d; /* A balance delta */
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int process_root = 1;
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node = CAVLTREE_find(tree, key, length);
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#ifdef DEBUG_ME
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fprintf(stderr, "Deletion of %p \"%s\"\n", node, key);
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dump_node(tree->root);
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fprintf(stderr, "-->\n");
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#endif
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if (!node)
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return;
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tree->count--;
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if (node == tree->last)
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tree->last = NULL;
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if (!node->left || !node->right) {
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rep = node->left ? : node->right;
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reb = node->parent;
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d = node == reb->left ? 1: -1;
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goto replace;
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}
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rep = CAVLTREE_next(tree, node);
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/* Detach replacement node */
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reb = rep->parent;
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d = rep == reb->left ? 1 : -1;
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if (reb == node)
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goto replace;
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child = rep->left ? : rep->right;
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if (child)
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child->parent = reb;
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if (rep == reb->left)
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reb->left = child;
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else
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reb->right = child;
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/* Replace 'node' by 'rep'. At this point, 'rep' may be anything
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* from an inner node to a half-leaf or leaf. */
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replace:;
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/* Fix enumerations */
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void *ebuf;
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struct enum_state *state;
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ebuf = GB.BeginEnum(tree);
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while (!GB.NextEnum()) {
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state = GB.GetEnum();
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if (state->next == node)
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state->next = rep;
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}
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GB.EndEnum(ebuf);
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if (node == tree->root) {
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tree->root = rep;
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if (rep) {
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rep->parent = rep;
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} else { /* Tree gets empty */
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tree->count = 0;
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tree->height = 0;
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NODE_destroy(node);
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return;
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}
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} else {
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if (node == node->parent->left)
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node->parent->left = rep;
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else
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node->parent->right = rep;
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if (rep)
|
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rep->parent = node->parent;
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}
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if (rep) {
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rep->balance = node->balance;
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if (rep != node->left) {
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rep->left = node->left;
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if (rep->left)
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rep->left->parent = rep;
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} else {
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rep->balance++;
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}
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if (rep != node->right) {
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rep->right = node->right;
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if (rep->right)
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rep->right->parent = rep;
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} else {
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rep->balance--;
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}
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}
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|
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NODE_destroy(node);
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|
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/* Rebalance */
|
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if (reb == tree->root)
|
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process_root = 0;
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do {
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int old_balance = reb->balance;
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NODE *rot;
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|
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reb->balance += d;
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switch (reb->balance) {
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case 2: /* Right heavy */
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rot = reb->right;
|
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if (rot->balance == 1) { /* Right-right */
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reb->balance = 0;
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rot->balance = 0;
|
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} else { /* Right-left */
|
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switch (rot->left->balance) {
|
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case 1:
|
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reb->balance = -1;
|
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rot->balance = 0;
|
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break;
|
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case 0:
|
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reb->balance = 0;
|
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rot->balance = 0;
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break;
|
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case -1:
|
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reb->balance = 0;
|
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rot->balance = 1;
|
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break;
|
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}
|
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rot->left->balance = 0;
|
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rotate_right(tree, rot);
|
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}
|
|
rotate_left(tree, reb);
|
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break;
|
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case -2: /* Left heavy */
|
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rot = reb->left;
|
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if (rot->balance == -1) { /* Left-left */
|
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reb->balance = 0;
|
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rot->balance = 0;
|
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} else { /* Left-right */
|
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switch (rot->right->balance) {
|
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case 1:
|
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reb->balance = 0;
|
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rot->balance = -1;
|
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break;
|
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case 0:
|
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reb->balance = 0;
|
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rot->balance = 0;
|
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break;
|
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case -1:
|
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reb->balance = 1;
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rot->balance = 0;
|
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break;
|
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}
|
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rot->right->balance = 0;
|
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rotate_left(tree, rot);
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}
|
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rotate_right(tree, reb);
|
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break;
|
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case -1:
|
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case 1:
|
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goto end;
|
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}
|
|
d = reb->balance - old_balance;
|
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if (reb == reb->parent->right)
|
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d = -d;
|
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reb = reb->parent;
|
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} while (reb != tree->root || process_root--);
|
|
tree->height--;
|
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end:;
|
|
#ifdef DEBUG_ME
|
|
dump_node(tree->root);
|
|
fprintf(stderr, "Deletion complete\n\n");
|
|
#endif
|
|
}
|
|
|
|
/**G
|
|
* Creates a new node with the given key and value or changes the value of
|
|
* an already existing key. If the value is Null, then the node is removed.
|
|
**/
|
|
BEGIN_METHOD(AvlTree_put, GB_VARIANT value; GB_STRING key)
|
|
|
|
NODE *node;
|
|
|
|
if (VARG(value).type == GB_T_NULL) {
|
|
CAVLTREE_remove(THIS, STRING(key), LENGTH(key));
|
|
return;
|
|
}
|
|
node = CAVLTREE_find_add(THIS, STRING(key), LENGTH(key));
|
|
GB.StoreVariant(ARG(value), &node->val);
|
|
THIS->last = node;
|
|
|
|
END_METHOD
|
|
|
|
/**G
|
|
* Visit each element of the tree in-order, i.e. from the smallest key to
|
|
* the greatest. The Key property of the tree is set according to the value
|
|
* in the enumerator.
|
|
*
|
|
* {example
|
|
* Dim v As Variant
|
|
*
|
|
* Print "Key", "Value"
|
|
* For Each v In hTree
|
|
* Print hTree.Key, v
|
|
* Next
|
|
* }
|
|
**/
|
|
BEGIN_METHOD_VOID(AvlTree_next)
|
|
|
|
NODE *node;
|
|
struct enum_state *state = GB.GetEnum();
|
|
|
|
if (!state->started) {
|
|
state->started = 1;
|
|
node = CAVLTREE_first(THIS);
|
|
} else {
|
|
node = state->next;
|
|
}
|
|
if (!node) {
|
|
GB.StopEnum();
|
|
return;
|
|
}
|
|
state->next = CAVLTREE_next(THIS, node);
|
|
THIS->last = node;
|
|
GB.ReturnVariant(&node->val);
|
|
|
|
END_METHOD
|
|
|
|
/**G
|
|
* Clear the tree, i.e. remove all elements. This is **way** faster than
|
|
* removing every element by assigning Null to it like this:
|
|
*
|
|
* For Each v In hTree
|
|
* hTree[hTree.Key] = Null
|
|
* Next
|
|
*
|
|
* Because removing an element may require to rebalance the tree at most
|
|
* hTree.Height times. For each element, this is a great overhead to have an
|
|
* empty tree.
|
|
*
|
|
* So use hTree.Clear() if the tree shall be emptied.
|
|
**/
|
|
BEGIN_METHOD_VOID(AvlTree_Clear)
|
|
|
|
CAVLTREE_clear(THIS);
|
|
|
|
END_METHOD
|
|
|
|
/**G
|
|
* Return whether an element with the given key exists.
|
|
**/
|
|
BEGIN_METHOD(AvlTree_Exist, GB_STRING key)
|
|
|
|
NODE *node;
|
|
|
|
node = CAVLTREE_find(THIS, STRING(key), LENGTH(key));
|
|
/* TODO: Use this as a cache for subsequent MoveTo() or anything */
|
|
THIS->last = node;
|
|
GB.ReturnBoolean(!!node);
|
|
|
|
END_METHOD
|
|
|
|
/**G
|
|
* Return the balance factor of the AvlTree. It is either -1, 0 or 1.
|
|
**/
|
|
BEGIN_PROPERTY(AvlTree_Balance)
|
|
|
|
if (!THIS->root) {
|
|
GB.ReturnInteger(0);
|
|
return;
|
|
}
|
|
GB.ReturnInteger(THIS->root->balance);
|
|
|
|
END_PROPERTY
|
|
|
|
/**G
|
|
* Return the number of elements in the tree.
|
|
**/
|
|
BEGIN_PROPERTY(AvlTree_Count)
|
|
|
|
GB.ReturnInteger(THIS->count);
|
|
|
|
END_PROPERTY
|
|
|
|
/**G
|
|
* Return the height of the tree.
|
|
**/
|
|
BEGIN_PROPERTY(AvlTree_Height)
|
|
|
|
GB.ReturnInteger(THIS->height);
|
|
|
|
END_PROPERTY
|
|
|
|
/**G
|
|
* Return the last used key. This can be Null if the element was removed
|
|
* meanwhile.
|
|
*
|
|
* Be careful as this property changes with nearly every operation on the
|
|
* tree.
|
|
**/
|
|
BEGIN_PROPERTY(AvlTree_Key)
|
|
|
|
if (!THIS->last)
|
|
GB.ReturnNull();
|
|
else
|
|
GB.ReturnString(THIS->last->key);
|
|
|
|
END_PROPERTY
|
|
|
|
GB_DESC CAvlTree[] = {
|
|
GB_DECLARE("AvlTree", sizeof(CAVLTREE)),
|
|
|
|
GB_METHOD("_new", NULL, AvlTree_new, NULL),
|
|
GB_METHOD("_free", NULL, AvlTree_free, NULL),
|
|
GB_METHOD("_get", "v", AvlTree_get, "(Key)s"),
|
|
GB_METHOD("_put", NULL, AvlTree_put, "(Value)v(Key)s"),
|
|
GB_METHOD("_next", "v", AvlTree_next, NULL),
|
|
|
|
GB_METHOD("Clear", NULL, AvlTree_Clear, NULL),
|
|
GB_METHOD("Exist", "b", AvlTree_Exist, "(Key)s"),
|
|
|
|
#if 0
|
|
/* Returns left and right subtree of root as array of new
|
|
* (deeply-copied) trees. This is trivial as any subtree in an
|
|
* AvlTree is also an AvlTree. */
|
|
GB_METHOD("Split", ".AvlTree.Split", AvlTree_Split, "(Key)s"),
|
|
/* Merge into this tree. */
|
|
GB_METHOD("Merge", NULL, AvlTree_Merge, "(OtherTree)AvlTree"),
|
|
/* Return a deep copy of the AvlTree */
|
|
GB_METHOD("Copy", "AvlTree", AvlTree_Copy, NULL),
|
|
#endif
|
|
|
|
GB_PROPERTY_READ("Balance", "i", AvlTree_Balance),
|
|
GB_PROPERTY_READ("Count", "i", AvlTree_Count),
|
|
GB_PROPERTY_READ("Height", "i", AvlTree_Height),
|
|
|
|
GB_PROPERTY_READ("Key", "s", AvlTree_Key),
|
|
|
|
GB_END_DECLARE
|
|
};
|
|
|
|
#if 0
|
|
GB_DESC CAvlTreeSplit[] = {
|
|
GB_DECLARE_VIRTUAL(".AvlTree.Split"),
|
|
|
|
GB_PROPERTY_READ("Left", "AvlTree", AvlTreeSplit_Left),
|
|
GB_PROPERTY_READ("Right", "AvlTree", AvlTreeSplit_Right),
|
|
GB_PROPERTY_READ("Both", "AvlTree[]", AvlTreeSplit_Both),
|
|
|
|
GB_END_DECLARE
|
|
};
|
|
#endif
|