summaryrefslogtreecommitdiff
path: root/3rdparty/plibsys/src/ptree-avl.c
diff options
context:
space:
mode:
Diffstat (limited to '3rdparty/plibsys/src/ptree-avl.c')
-rw-r--r--3rdparty/plibsys/src/ptree-avl.c481
1 files changed, 481 insertions, 0 deletions
diff --git a/3rdparty/plibsys/src/ptree-avl.c b/3rdparty/plibsys/src/ptree-avl.c
new file mode 100644
index 0000000..c100e5c
--- /dev/null
+++ b/3rdparty/plibsys/src/ptree-avl.c
@@ -0,0 +1,481 @@
+/*
+ * The MIT License
+ *
+ * Copyright (C) 2016 Alexander Saprykin <saprykin.spb@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * 'Software'), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "pmem.h"
+#include "ptree-avl.h"
+
+typedef struct PTreeAVLNode_ {
+ struct PTreeBaseNode_ base;
+ struct PTreeAVLNode_ *parent;
+ pint balance_factor;
+} PTreeAVLNode;
+
+static void pp_tree_avl_rotate_left (PTreeAVLNode *node, PTreeBaseNode **root);
+static void pp_tree_avl_rotate_right (PTreeAVLNode *node, PTreeBaseNode **root);
+static void pp_tree_avl_rotate_left_right (PTreeAVLNode *node, PTreeBaseNode **root);
+static void pp_tree_avl_rotate_right_left (PTreeAVLNode *node, PTreeBaseNode **root);
+static void pp_tree_avl_balance_insert (PTreeAVLNode *node, PTreeBaseNode **root);
+static void pp_tree_avl_balance_remove (PTreeAVLNode *node, PTreeBaseNode **root);
+
+static void
+pp_tree_avl_rotate_left (PTreeAVLNode *node, PTreeBaseNode **root)
+{
+ node->parent->base.right = node->base.left;
+
+ if (node->base.left != NULL)
+ ((PTreeAVLNode *) node->base.left)->parent = (PTreeAVLNode *) node->parent;
+
+ node->base.left = (PTreeBaseNode *) node->parent;
+ node->parent = ((PTreeAVLNode *) node->base.left)->parent;
+ ((PTreeAVLNode *) node->base.left)->parent = node;
+
+ if (P_LIKELY (node->parent != NULL)) {
+ if (node->parent->base.left == node->base.left)
+ node->parent->base.left = (PTreeBaseNode *) node;
+ else
+ node->parent->base.right = (PTreeBaseNode *) node;
+ } else
+ *root = (PTreeBaseNode *) node;
+
+ /* Restore balance factor */
+ ((PTreeAVLNode *) node)->balance_factor +=1;
+ ((PTreeAVLNode *) node->base.left)->balance_factor = -((PTreeAVLNode *) node)->balance_factor;
+}
+
+static void
+pp_tree_avl_rotate_right (PTreeAVLNode *node, PTreeBaseNode **root)
+{
+ node->parent->base.left = node->base.right;
+
+ if (node->base.right != NULL)
+ ((PTreeAVLNode *) node->base.right)->parent = (PTreeAVLNode *) node->parent;
+
+ node->base.right = (PTreeBaseNode *) node->parent;
+ node->parent = ((PTreeAVLNode *) node->base.right)->parent;
+ ((PTreeAVLNode *) node->base.right)->parent = node;
+
+ if (P_LIKELY (node->parent != NULL)) {
+ if (node->parent->base.left == node->base.right)
+ node->parent->base.left = (PTreeBaseNode *) node;
+ else
+ node->parent->base.right = (PTreeBaseNode *) node;
+ } else
+ *root = (PTreeBaseNode *) node;
+
+ /* Restore balance factor */
+ ((PTreeAVLNode *) node)->balance_factor -= 1;
+ ((PTreeAVLNode *) node->base.right)->balance_factor = -((PTreeAVLNode *) node)->balance_factor;
+}
+
+static void
+pp_tree_avl_rotate_left_right (PTreeAVLNode *node, PTreeBaseNode **root)
+{
+ PTreeAVLNode *tmp_node;
+
+ tmp_node = (PTreeAVLNode *) node->base.right;
+ node->base.right = tmp_node->base.left;
+
+ if (node->base.right != NULL)
+ ((PTreeAVLNode *) node->base.right)->parent = node;
+
+ tmp_node->parent = node->parent->parent;
+
+ if (P_LIKELY (tmp_node->parent != NULL)) {
+ if (tmp_node->parent->base.left == (PTreeBaseNode *) node->parent)
+ tmp_node->parent->base.left = (PTreeBaseNode *) tmp_node;
+ else
+ tmp_node->parent->base.right = (PTreeBaseNode *) tmp_node;
+ } else
+ *root = (PTreeBaseNode *) tmp_node;
+
+ node->parent->base.left = tmp_node->base.right;
+
+ if (node->parent->base.left != NULL)
+ ((PTreeAVLNode *) node->parent->base.left)->parent = node->parent;
+
+ tmp_node->base.right = (PTreeBaseNode *) node->parent;
+ ((PTreeAVLNode *) tmp_node->base.right)->parent = tmp_node;
+
+ tmp_node->base.left = (PTreeBaseNode *) node;
+ node->parent = tmp_node;
+
+ /* Restore balance factor */
+ if (tmp_node->balance_factor == 1) {
+ ((PTreeAVLNode *) tmp_node->base.left)->balance_factor = 0;
+ ((PTreeAVLNode *) tmp_node->base.right)->balance_factor = -1;
+ } else if (tmp_node->balance_factor == -1) {
+ ((PTreeAVLNode *) tmp_node->base.left)->balance_factor = 1;
+ ((PTreeAVLNode *) tmp_node->base.right)->balance_factor = 0;
+ } else {
+ ((PTreeAVLNode *) tmp_node->base.left)->balance_factor = 0;
+ ((PTreeAVLNode *) tmp_node->base.right)->balance_factor = 0;
+ }
+
+ tmp_node->balance_factor = 0;
+}
+
+static void
+pp_tree_avl_rotate_right_left (PTreeAVLNode *node, PTreeBaseNode **root)
+{
+ PTreeAVLNode *tmp_node;
+
+ tmp_node = (PTreeAVLNode *) node->base.left;
+ node->base.left = tmp_node->base.right;
+
+ if (node->base.left != NULL)
+ ((PTreeAVLNode *) node->base.left)->parent = node;
+
+ tmp_node->parent = node->parent->parent;
+
+ if (P_LIKELY (tmp_node->parent != NULL)) {
+ if (tmp_node->parent->base.left == (PTreeBaseNode *) node->parent)
+ tmp_node->parent->base.left = (PTreeBaseNode *) tmp_node;
+ else
+ tmp_node->parent->base.right = (PTreeBaseNode *) tmp_node;
+ } else
+ *root = (PTreeBaseNode *) tmp_node;
+
+ node->parent->base.right = tmp_node->base.left;
+
+ if (node->parent->base.right != NULL)
+ ((PTreeAVLNode *) node->parent->base.right)->parent = node->parent;
+
+ tmp_node->base.left = (PTreeBaseNode *) node->parent;
+ ((PTreeAVLNode *) tmp_node->base.left)->parent = tmp_node;
+
+ tmp_node->base.right = (PTreeBaseNode *) node;
+ node->parent = tmp_node;
+
+ /* Restore balance factor */
+ if (tmp_node->balance_factor == 1) {
+ ((PTreeAVLNode *) tmp_node->base.left)->balance_factor = 0;
+ ((PTreeAVLNode *) tmp_node->base.right)->balance_factor = -1;
+ } else if (tmp_node->balance_factor == -1) {
+ ((PTreeAVLNode *) tmp_node->base.left)->balance_factor = 1;
+ ((PTreeAVLNode *) tmp_node->base.right)->balance_factor = 0;
+ } else {
+ ((PTreeAVLNode *) tmp_node->base.left)->balance_factor = 0;
+ ((PTreeAVLNode *) tmp_node->base.right)->balance_factor = 0;
+ }
+
+ tmp_node->balance_factor = 0;
+}
+
+static void
+pp_tree_avl_balance_insert (PTreeAVLNode *node, PTreeBaseNode **root)
+{
+ PTreeAVLNode *parent;
+
+ while (TRUE) {
+ parent = node->parent;
+
+ if (P_UNLIKELY (parent == NULL))
+ break;
+
+ if (parent->base.left == (PTreeBaseNode *) node) {
+ if (parent->balance_factor == 1) {
+ if (node->balance_factor == -1)
+ /* Case 1: Left-right rotate
+ *
+ * (5) (4)
+ * / \ / \
+ * (3) A --> (3) (5)
+ * / \ / \ / \
+ * B (4) B C D A
+ * / \
+ * C D
+ */
+ pp_tree_avl_rotate_left_right (node, root);
+ else
+ /* Case 2: Right rotate
+ *
+ * (5) (4)
+ * / \ / \
+ * (4) A --> (3) (5)
+ * / \ / \ / \
+ * (3) B C D B A
+ * / \
+ * C D
+ */
+ pp_tree_avl_rotate_right (node, root);
+
+ break;
+ } else if (parent->balance_factor == -1) {
+ /* Case 3: Increase parent balance factor */
+ parent->balance_factor = 0;
+ break;
+ } else
+ /* Case 4: Increase parent balance factor */
+ parent->balance_factor = 1;
+ } else {
+ if (parent->balance_factor == -1) {
+ if (node->balance_factor == 1)
+ /* Case 1: Right-left rotate
+ *
+ * (3) (4)
+ * / \ / \
+ * A (5) --> (3) (5)
+ * / \ / \ / \
+ * (4) B A C D B
+ * / \
+ * C D
+ */
+ pp_tree_avl_rotate_right_left (node, root);
+ else
+ /* Case 2: Left rotate
+ *
+ * (3) (4)
+ * / \ / \
+ * A (4) --> (3) (5)
+ * / \ / \ / \
+ * B (5) A B C D
+ * / \
+ * C D
+ */
+ pp_tree_avl_rotate_left (node, root);
+
+ break;
+ } else if (parent->balance_factor == 1) {
+ /* Case 3: Decrease parent balance factor */
+ parent->balance_factor = 0;
+ break;
+ } else
+ /* Case 4: Decrease parent balance factor */
+ parent->balance_factor = -1;
+ }
+
+ node = node->parent;
+ }
+}
+
+static void
+pp_tree_avl_balance_remove (PTreeAVLNode *node, PTreeBaseNode **root)
+{
+ PTreeAVLNode *parent;
+ PTreeAVLNode *sibling;
+ pint sibling_balance;
+
+ while (TRUE) {
+ parent = node->parent;
+
+ if (P_UNLIKELY (parent == NULL))
+ break;
+
+ if (parent->base.left == (PTreeBaseNode *) node) {
+ if (parent->balance_factor == -1) {
+ sibling = (PTreeAVLNode *) parent->base.right;
+ sibling_balance = sibling->balance_factor;
+
+ if (sibling->balance_factor == 1)
+ /* Case 1 */
+ pp_tree_avl_rotate_right_left (sibling, root);
+ else
+ /* Case 2 */
+ pp_tree_avl_rotate_left (sibling, root);
+
+ node = parent;
+
+ if (sibling_balance == 0)
+ break;
+ } else if (parent->balance_factor == 0) {
+ /* Case 3 */
+ parent->balance_factor = -1;
+ break;
+ } else
+ /* Case 4 */
+ parent->balance_factor = 0;
+ } else {
+ if (parent->balance_factor == 1) {
+ sibling = (PTreeAVLNode *) parent->base.left;
+ sibling_balance = sibling->balance_factor;
+
+ if (sibling->balance_factor == -1)
+ /* Case 1 */
+ pp_tree_avl_rotate_left_right (sibling, root);
+ else
+ /* Case 2 */
+ pp_tree_avl_rotate_right (sibling, root);
+
+ node = parent;
+
+ if (sibling_balance == 0)
+ break;
+ } else if (parent->balance_factor == 0) {
+ /* Case 3 */
+ parent->balance_factor = 1;
+ break;
+ } else
+ /* Case 4 */
+ parent->balance_factor = 0;
+ }
+
+ node = node->parent;
+ }
+}
+
+pboolean
+p_tree_avl_insert (PTreeBaseNode **root_node,
+ PCompareDataFunc compare_func,
+ ppointer data,
+ PDestroyFunc key_destroy_func,
+ PDestroyFunc value_destroy_func,
+ ppointer key,
+ ppointer value)
+{
+ PTreeBaseNode **cur_node;
+ PTreeBaseNode *parent_node;
+ pint cmp_result;
+
+ cur_node = root_node;
+ parent_node = *root_node;
+
+ /* Find where to insert the node */
+ while (*cur_node != NULL) {
+ cmp_result = compare_func (key, (*cur_node)->key, data);
+
+ if (cmp_result < 0) {
+ parent_node = *cur_node;
+ cur_node = &(*cur_node)->left;
+ } else if (cmp_result > 0) {
+ parent_node = *cur_node;
+ cur_node = &(*cur_node)->right;
+ } else
+ break;
+ }
+
+ /* If we have existing one - replace a key-value pair */
+ if (*cur_node != NULL) {
+ if (key_destroy_func != NULL)
+ key_destroy_func ((*cur_node)->key);
+
+ if (value_destroy_func != NULL)
+ value_destroy_func ((*cur_node)->value);
+
+ (*cur_node)->key = key;
+ (*cur_node)->value = value;
+
+ return FALSE;
+ }
+
+ if (P_UNLIKELY ((*cur_node = p_malloc0 (sizeof (PTreeAVLNode))) == NULL))
+ return FALSE;
+
+ (*cur_node)->key = key;
+ (*cur_node)->value = value;
+
+ ((PTreeAVLNode *) *cur_node)->balance_factor = 0;
+ ((PTreeAVLNode *) *cur_node)->parent = (PTreeAVLNode *) parent_node;
+
+ /* Balance the tree */
+ pp_tree_avl_balance_insert (((PTreeAVLNode *) *cur_node), root_node);
+
+ return TRUE;
+}
+
+pboolean
+p_tree_avl_remove (PTreeBaseNode **root_node,
+ PCompareDataFunc compare_func,
+ ppointer data,
+ PDestroyFunc key_destroy_func,
+ PDestroyFunc value_destroy_func,
+ pconstpointer key)
+{
+ PTreeBaseNode *cur_node;
+ PTreeBaseNode *prev_node;
+ PTreeBaseNode *child_node;
+ PTreeAVLNode *child_parent;
+ pint cmp_result;
+
+ cur_node = *root_node;
+
+ while (cur_node != NULL) {
+ cmp_result = compare_func (key, cur_node->key, data);
+
+ if (cmp_result < 0)
+ cur_node = cur_node->left;
+ else if (cmp_result > 0)
+ cur_node = cur_node->right;
+ else
+ break;
+ }
+
+ if (P_UNLIKELY (cur_node == NULL))
+ return FALSE;
+
+ if (cur_node->left != NULL && cur_node->right != NULL) {
+ prev_node = cur_node->left;
+
+ while (prev_node->right != NULL)
+ prev_node = prev_node->right;
+
+ cur_node->key = prev_node->key;
+ cur_node->value = prev_node->value;
+
+ /* Mark node for removal */
+ cur_node = prev_node;
+ }
+
+ child_node = cur_node->left == NULL ? cur_node->right : cur_node->left;
+
+ if (child_node == NULL)
+ pp_tree_avl_balance_remove ((PTreeAVLNode *) cur_node, root_node);
+
+ /* Replace node with its child */
+ if (P_UNLIKELY (cur_node == *root_node)) {
+ *root_node = child_node;
+ child_parent = NULL;
+ } else {
+ child_parent = ((PTreeAVLNode *) cur_node)->parent;
+
+ if (child_parent->base.left == cur_node)
+ child_parent->base.left = child_node;
+ else
+ child_parent->base.right = child_node;
+ }
+
+ if (child_node != NULL) {
+ ((PTreeAVLNode *) child_node)->parent = child_parent;
+
+ /* Balance the tree */
+ pp_tree_avl_balance_remove ((PTreeAVLNode *) child_node, root_node);
+ }
+
+ /* Free unused node */
+ if (key_destroy_func != NULL)
+ key_destroy_func (cur_node->key);
+
+ if (value_destroy_func != NULL)
+ value_destroy_func (cur_node->value);
+
+ p_free (cur_node);
+
+ return TRUE;
+}
+
+void
+p_tree_avl_node_free (PTreeBaseNode *node)
+{
+ p_free (node);
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-11-01 14:26:08 +0000