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/*
Copyright (C) 2010 Timothy Pearson <kb9vqf@pearsoncomputing.net>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#include <tqt.h>
#include <tqmap.h>
#ifdef USE_QT4
typedef TQMapNodeBase* NodePtr;
typedef TQMapNodeBase Node;
void TQMapPrivateBase::rotateLeft( NodePtr x, NodePtr& root)
{
NodePtr y = x->right;
x->right = y->left;
if (y->left !=0)
y->left->parent = x;
y->parent = x->parent;
if (x == root)
root = y;
else if (x == x->parent->left)
x->parent->left = y;
else
x->parent->right = y;
y->left = x;
x->parent = y;
}
void TQMapPrivateBase::rotateRight( NodePtr x, NodePtr& root )
{
NodePtr y = x->left;
x->left = y->right;
if (y->right != 0)
y->right->parent = x;
y->parent = x->parent;
if (x == root)
root = y;
else if (x == x->parent->right)
x->parent->right = y;
else
x->parent->left = y;
y->right = x;
x->parent = y;
}
void TQMapPrivateBase::rebalance( NodePtr x, NodePtr& root)
{
x->color = Node::Red;
while ( x != root && x->parent->color == Node::Red ) {
if ( x->parent == x->parent->parent->left ) {
NodePtr y = x->parent->parent->right;
if (y && y->color == Node::Red) {
x->parent->color = Node::Black;
y->color = Node::Black;
x->parent->parent->color = Node::Red;
x = x->parent->parent;
} else {
if (x == x->parent->right) {
x = x->parent;
rotateLeft( x, root );
}
x->parent->color = Node::Black;
x->parent->parent->color = Node::Red;
rotateRight (x->parent->parent, root );
}
} else {
NodePtr y = x->parent->parent->left;
if ( y && y->color == Node::Red ) {
x->parent->color = Node::Black;
y->color = Node::Black;
x->parent->parent->color = Node::Red;
x = x->parent->parent;
} else {
if (x == x->parent->left) {
x = x->parent;
rotateRight( x, root );
}
x->parent->color = Node::Black;
x->parent->parent->color = Node::Red;
rotateLeft( x->parent->parent, root );
}
}
}
root->color = Node::Black;
}
NodePtr TQMapPrivateBase::removeAndRebalance( NodePtr z, NodePtr& root,
NodePtr& leftmost,
NodePtr& rightmost )
{
NodePtr y = z;
NodePtr x;
NodePtr x_parent;
if (y->left == 0) {
x = y->right;
} else {
if (y->right == 0)
x = y->left;
else
{
y = y->right;
while (y->left != 0)
y = y->left;
x = y->right;
}
}
if (y != z) {
z->left->parent = y;
y->left = z->left;
if (y != z->right) {
x_parent = y->parent;
if (x)
x->parent = y->parent;
y->parent->left = x;
y->right = z->right;
z->right->parent = y;
} else {
x_parent = y;
}
if (root == z)
root = y;
else if (z->parent->left == z)
z->parent->left = y;
else
z->parent->right = y;
y->parent = z->parent;
// Swap the colors
Node::Color c = y->color;
y->color = z->color;
z->color = c;
y = z;
} else {
x_parent = y->parent;
if (x)
x->parent = y->parent;
if (root == z)
root = x;
else if (z->parent->left == z)
z->parent->left = x;
else
z->parent->right = x;
if ( leftmost == z ) {
if (z->right == 0)
leftmost = z->parent;
else
leftmost = x->minimum();
}
if (rightmost == z) {
if (z->left == 0)
rightmost = z->parent;
else
rightmost = x->maximum();
}
}
if (y->color != Node::Red) {
while (x != root && (x == 0 || x->color == Node::Black)) {
if (x == x_parent->left) {
NodePtr w = x_parent->right;
if (w->color == Node::Red) {
w->color = Node::Black;
x_parent->color = Node::Red;
rotateLeft(x_parent, root);
w = x_parent->right;
}
if ((w->left == 0 || w->left->color == Node::Black) &&
(w->right == 0 || w->right->color == Node::Black)) {
w->color = Node::Red;
x = x_parent;
x_parent = x_parent->parent;
} else {
if (w->right == 0 || w->right->color == Node::Black) {
if (w->left)
w->left->color = Node::Black;
w->color = Node::Red;
rotateRight(w, root);
w = x_parent->right;
}
w->color = x_parent->color;
x_parent->color = Node::Black;
if (w->right)
w->right->color = Node::Black;
rotateLeft(x_parent, root);
break;
}
} else {
NodePtr w = x_parent->left;
if (w->color == Node::Red) {
w->color = Node::Black;
x_parent->color = Node::Red;
rotateRight(x_parent, root);
w = x_parent->left;
}
if ((w->right == 0 || w->right->color == Node::Black) &&
(w->left == 0 || w->left->color == Node::Black)) {
w->color = Node::Red;
x = x_parent;
x_parent = x_parent->parent;
} else {
if (w->left == 0 || w->left->color == Node::Black) {
if (w->right)
w->right->color = Node::Black;
w->color = Node::Red;
rotateLeft(w, root);
w = x_parent->left;
}
w->color = x_parent->color;
x_parent->color = Node::Black;
if (w->left)
w->left->color = Node::Black;
rotateRight(x_parent, root);
break;
}
}
}
if (x)
x->color = Node::Black;
}
return y;
}
#endif // USE_QT4
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