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+/****************************************************************************
+**
+**
+** Implementation of QMap
+**
+** Created : 990406
+**
+** Copyright (C) 1992-2000 Trolltech AS. All rights reserved.
+**
+** This file is part of the tools module of the Qt GUI Toolkit.
+**
+** This file may be distributed under the terms of the Q Public License
+** as defined by Trolltech AS of Norway and appearing in the file
+** LICENSE.QPL included in the packaging of this file.
+**
+** This file may be distributed and/or modified under the terms of the
+** GNU General Public License version 2 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.
+**
+** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
+** licenses may use this file in accordance with the Qt Commercial License
+** Agreement provided with the Software.
+**
+** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
+** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+**
+** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
+** information about Qt Commercial License Agreements.
+** See http://www.trolltech.com/qpl/ for QPL licensing information.
+** See http://www.trolltech.com/gpl/ for GPL licensing information.
+**
+** Contact info@trolltech.com if any conditions of this licensing are
+** not clear to you.
+**
+**********************************************************************/
+
+#include "qmap.h"
+
+typedef QMapNodeBase* NodePtr;
+typedef QMapNodeBase Node;
+
+
+void QMapPrivateBase::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 QMapPrivateBase::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 QMapPrivateBase::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 QMapPrivateBase::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;
+}
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