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feat(tree): bit flag so children know which child they are

pull/5/head
Jef Roosens 2023-01-29 20:57:08 +01:00
parent 193fc4b454
commit e5130a6383
Signed by: Jef Roosens
GPG Key ID: B75D4F293C7052DB
4 changed files with 89 additions and 74 deletions
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2
src/tree/vieter_tree.c
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@ -16,7 +16,7 @@ vieter_tree_error vieter_tree_insert(vieter_tree *tree, uint64_t key,
tree->root = vieter_tree_node_init(); tree->root = vieter_tree_node_init();
tree->root->key = key; tree->root->key = key;
tree->root->data = data; tree->root->data = data;
vieter_tree_node_set(tree->root, vieter_tree_node_black); vieter_tree_node_set(tree->root, vieter_tree_node_black, true);
tree->size = 1; tree->size = 1;
return vieter_tree_ok; return vieter_tree_ok;

100
src/tree/vieter_tree_balancing.c
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@ -1,4 +1,5 @@
#include "vieter_tree_balancing.h" #include "vieter_tree_balancing.h"
#include <string.h>
bool vieter_tree_node_validate(vieter_tree_node *node, bool vieter_tree_node_validate(vieter_tree_node *node,
uint64_t passed_black_nodes, uint64_t passed_black_nodes,
@ -38,48 +39,48 @@ vieter_tree_node *vieter_tree_node_balance(vieter_tree_node *node) {
uint64_t key_root = root->key; uint64_t key_root = root->key;
void *data_root = root->data; void *data_root = root->data;
if (node->key < parent->key && parent->key < grand_parent->key) { if (vieter_tree_node_get(node, vieter_tree_node_right)) {
left = parent;
right = node;
if (vieter_tree_node_get(parent, vieter_tree_node_right)) {
root->key = parent->key; root->key = parent->key;
root->data = parent->data; root->data = parent->data;
parent->key = key_root; parent->key = key_root;
parent->data = data_root; parent->data = data_root;
left = node;
right = parent;
children[0] = node->children[0];
children[1] = node->children[1];
children[2] = parent->children[1];
children[3] = grand_parent->children[1];
} else if (node->key < parent->key && parent->key > grand_parent->key) {
root->key = node->key;
root->data = node->data;
node->key = key_root;
node->data = data_root;
left = node;
right = parent;
children[0] = grand_parent->children[0]; children[0] = grand_parent->children[0];
children[1] = node->children[0]; children[1] = parent->children[0];
children[2] = node->children[1]; children[2] = node->children[0];
children[3] = parent->children[1]; children[3] = node->children[1];
} else if (node->key > parent->key && parent->key < grand_parent->key) { } else {
root->key = node->key; root->key = node->key;
root->data = node->data; root->data = node->data;
node->key = key_root; node->key = key_root;
node->data = data_root; node->data = data_root;
left = parent;
right = node;
children[0] = parent->children[0]; children[0] = parent->children[0];
children[1] = node->children[0]; children[1] = node->children[0];
children[2] = node->children[1]; children[2] = node->children[1];
children[3] = grand_parent->children[1]; children[3] = grand_parent->children[1];
}
} else {
left = node;
right = parent;
if (vieter_tree_node_get(parent, vieter_tree_node_right)) {
root->key = node->key;
root->data = node->data;
node->key = key_root;
node->data = data_root;
children[0] = grand_parent->children[0];
children[1] = node->children[0];
children[2] = node->children[1];
children[3] = parent->children[1];
} else { } else {
root->key = parent->key; root->key = parent->key;
root->data = parent->data; root->data = parent->data;
@ -87,36 +88,47 @@ vieter_tree_node *vieter_tree_node_balance(vieter_tree_node *node) {
parent->key = key_root; parent->key = key_root;
parent->data = data_root; parent->data = data_root;
left = parent; children[0] = node->children[0];
right = node; children[1] = node->children[1];
children[2] = parent->children[1];
children[0] = grand_parent->children[0]; children[3] = grand_parent->children[1];
children[1] = parent->children[0]; }
children[2] = node->children[0];
children[3] = node->children[1];
} }
vieter_tree_node_set(left, vieter_tree_node_black); vieter_tree_node_set(
vieter_tree_node_set(right, vieter_tree_node_black); root, vieter_tree_node_right,
vieter_tree_node_unset(root, vieter_tree_node_black); vieter_tree_node_get(grand_parent, vieter_tree_node_right));
left->children[0] = children[0]; vieter_tree_node_set(left, vieter_tree_node_black, true);
left->children[1] = children[1]; vieter_tree_node_set(left, vieter_tree_node_right, false);
vieter_tree_node_set(right, vieter_tree_node_black, true);
vieter_tree_node_set(left, vieter_tree_node_right, true);
if (children[0] != NULL) vieter_tree_node_set(root, vieter_tree_node_black, false);
memcpy(&left->children, children, 2 * sizeof(vieter_tree_node *));
if (children[0] != NULL) {
children[0]->parent = left; children[0]->parent = left;
vieter_tree_node_set(children[0], vieter_tree_node_right, false);
}
if (children[1] != NULL) if (children[1] != NULL) {
children[1]->parent = left; children[1]->parent = left;
vieter_tree_node_set(children[0], vieter_tree_node_right, true);
}
right->children[0] = children[2]; memcpy(&right->children, children + 2, 2 * sizeof(vieter_tree_node *));
right->children[1] = children[3];
if (children[2] != NULL) if (children[2] != NULL) {
children[2]->parent = right; children[2]->parent = right;
vieter_tree_node_set(children[2], vieter_tree_node_right, false);
}
if (children[3] != NULL) if (children[3] != NULL) {
children[3]->parent = right; children[3]->parent = right;
vieter_tree_node_set(children[2], vieter_tree_node_right, true);
}
root->children[0] = left; root->children[0] = left;
root->children[1] = right; root->children[1] = right;
@ -135,7 +147,7 @@ void vieter_tree_node_balance_after_insert(vieter_tree_node *node) {
// The root must always be black // The root must always be black
if (node->parent == NULL) { if (node->parent == NULL) {
vieter_tree_node_set(node, vieter_tree_node_black); vieter_tree_node_set(node, vieter_tree_node_black, true);
} }
} }

20
src/tree/vieter_tree_node.c
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@ -1,6 +1,8 @@
#include "vieter_tree_node.h" #include "vieter_tree_node.h"
#include "vieter_tree_balancing.h" #include "vieter_tree_balancing.h"
#include <string.h>
vieter_tree_node *vieter_tree_node_init() { vieter_tree_node *vieter_tree_node_init() {
return calloc(1, sizeof(vieter_tree_node)); return calloc(1, sizeof(vieter_tree_node));
} }
@ -13,10 +15,12 @@ void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key,
return; return;
} }
parent->children[key > parent->key] = child; bool side = key > parent->key;
parent->children[side] = child;
if (child != NULL) { if (child != NULL) {
child->parent = parent; child->parent = parent;
vieter_tree_node_set(child, vieter_tree_node_right, side);
} }
} }
@ -24,8 +28,8 @@ void vieter_tree_node_replace_with_child(vieter_tree_node *to_replace,
vieter_tree_node *replacement) { vieter_tree_node *replacement) {
to_replace->key = replacement->key; to_replace->key = replacement->key;
to_replace->data = replacement->data; to_replace->data = replacement->data;
to_replace->children[0] = replacement->children[0]; memcpy(to_replace->children, replacement->children,
to_replace->children[1] = replacement->children[1]; 2 * sizeof(vieter_tree_node *));
if (to_replace->children[0] != NULL) if (to_replace->children[0] != NULL)
to_replace->children[0]->parent = to_replace; to_replace->children[0]->parent = to_replace;
@ -140,13 +144,13 @@ vieter_tree_error vieter_tree_node_remove(void **out, vieter_tree_node *root,
return vieter_tree_ok; return vieter_tree_ok;
} }
void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag) { void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag,
bool set) {
if (set) {
node->flags |= flag; node->flags |= flag;
} } else {
void vieter_tree_node_unset(vieter_tree_node *node,
vieter_tree_node_flag flag) {
node->flags &= ~flag; node->flags &= ~flag;
}
} }
bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag) { bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag) {

3
src/tree/vieter_tree_node.h
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@ -37,8 +37,7 @@ vieter_tree_error vieter_tree_node_remove(void **out, vieter_tree_node *root, ui
void vieter_tree_node_replace_with_child(vieter_tree_node *to_replace, vieter_tree_node *replacement); void vieter_tree_node_replace_with_child(vieter_tree_node *to_replace, vieter_tree_node *replacement);
void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag); void vieter_tree_node_set(vieter_tree_node *node, vieter_tree_node_flag flag, bool value);
void vieter_tree_node_unset(vieter_tree_node *node, vieter_tree_node_flag flag);
bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag); bool vieter_tree_node_get(vieter_tree_node *node, vieter_tree_node_flag flag);
void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key, void vieter_tree_node_add_child(vieter_tree_node *parent, uint64_t key,