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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4ARRAY_H
+#define QV4ARRAY_H
+
+#include "qv4global_p.h"
+#include <QtCore/qmap.h>
+#include "qv4value_p.h"
+#include "qv4property_p.h"
+#include <assert.h>
+
+#ifdef Q_MAP_DEBUG
+#include <QtCore/qdebug.h>
+#endif
+
+#include <new>
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+struct SparseArray;
+
+class ArrayElementLessThan
+{
+public:
+    inline ArrayElementLessThan(ExecutionContext *context, Object *thisObject, const Value &comparefn)
+        : m_context(context), thisObject(thisObject), m_comparefn(comparefn) {}
+
+    bool operator()(const Property &v1, const Property &v2) const;
+
+private:
+    ExecutionContext *m_context;
+    Object *thisObject;
+    Value m_comparefn;
+};
+
+
+struct SparseArrayNode
+{
+    quintptr p;
+    SparseArrayNode *left;
+    SparseArrayNode *right;
+    uint size_left;
+    uint value;
+
+    enum Color { Red = 0, Black = 1 };
+    enum { Mask = 3 }; // reserve the second bit as well
+
+    const SparseArrayNode *nextNode() const;
+    SparseArrayNode *nextNode() { return const_cast<SparseArrayNode *>(const_cast<const SparseArrayNode *>(this)->nextNode()); }
+    const SparseArrayNode *previousNode() const;
+    SparseArrayNode *previousNode() { return const_cast<SparseArrayNode *>(const_cast<const SparseArrayNode *>(this)->previousNode()); }
+
+    Color color() const { return Color(p & 1); }
+    void setColor(Color c) { if (c == Black) p |= Black; else p &= ~Black; }
+    SparseArrayNode *parent() const { return reinterpret_cast<SparseArrayNode *>(p & ~Mask); }
+    void setParent(SparseArrayNode *pp) { p = (p & Mask) | quintptr(pp); }
+
+    uint key() const {
+        uint k = size_left;
+        const SparseArrayNode *n = this;
+        while (SparseArrayNode *p = n->parent()) {
+            if (p && p->right == n)
+                k += p->size_left;
+            n = p;
+        }
+        return k;
+    }
+
+    SparseArrayNode *copy(SparseArray *d) const;
+
+    SparseArrayNode *lowerBound(uint key);
+    SparseArrayNode *upperBound(uint key);
+};
+
+
+inline SparseArrayNode *SparseArrayNode::lowerBound(uint akey)
+{
+    SparseArrayNode *n = this;
+    SparseArrayNode *last = 0;
+    while (n) {
+        if (akey <= n->size_left) {
+            last = n;
+            n = n->left;
+        } else {
+            akey -= n->size_left;
+            n = n->right;
+        }
+    }
+    return last;
+}
+
+
+inline SparseArrayNode *SparseArrayNode::upperBound(uint akey)
+{
+    SparseArrayNode *n = this;
+    SparseArrayNode *last = 0;
+    while (n) {
+        if (akey < n->size_left) {
+            last = n;
+            n = n->left;
+        } else {
+            akey -= n->size_left;
+            n = n->right;
+        }
+    }
+    return last;
+}
+
+
+
+struct Q_QML_EXPORT SparseArray
+{
+    SparseArray();
+    ~SparseArray() {
+        if (root())
+            freeTree(header.left, Q_ALIGNOF(SparseArrayNode));
+    }
+
+    SparseArray(const SparseArray &other);
+private:
+    SparseArray &operator=(const SparseArray &other);
+
+    int numEntries;
+    SparseArrayNode header;
+    SparseArrayNode *mostLeftNode;
+
+    void rotateLeft(SparseArrayNode *x);
+    void rotateRight(SparseArrayNode *x);
+    void rebalance(SparseArrayNode *x);
+    void recalcMostLeftNode();
+
+    SparseArrayNode *root() const { return header.left; }
+
+    void deleteNode(SparseArrayNode *z);
+
+
+public:
+    SparseArrayNode *createNode(uint sl, SparseArrayNode *parent, bool left);
+    void freeTree(SparseArrayNode *root, int alignment);
+
+    SparseArrayNode *findNode(uint akey) const;
+
+    uint pop_front();
+    void push_front(uint at);
+    uint pop_back(uint len);
+    void push_back(uint at, uint len);
+
+    QList<int> keys() const;
+
+    const SparseArrayNode *end() const { return &header; }
+    SparseArrayNode *end() { return &header; }
+    const SparseArrayNode *begin() const { if (root()) return mostLeftNode; return end(); }
+    SparseArrayNode *begin() { if (root()) return mostLeftNode; return end(); }
+
+    SparseArrayNode *erase(SparseArrayNode *n);
+
+    SparseArrayNode *lowerBound(uint key);
+    const SparseArrayNode *lowerBound(uint key) const;
+    SparseArrayNode *upperBound(uint key);
+    const SparseArrayNode *upperBound(uint key) const;
+    SparseArrayNode *insert(uint akey);
+
+    // STL compatibility
+    typedef uint key_type;
+    typedef int mapped_type;
+    typedef qptrdiff difference_type;
+    typedef int size_type;
+
+#ifdef Q_MAP_DEBUG
+    void dump() const;
+#endif
+};
+
+inline SparseArrayNode *SparseArray::findNode(uint akey) const
+{
+    SparseArrayNode *n = root();
+
+    while (n) {
+        if (akey == n->size_left) {
+            return n;
+        } else if (akey < n->size_left) {
+            n = n->left;
+        } else {
+            akey -= n->size_left;
+            n = n->right;
+        }
+    }
+
+    return 0;
+}
+
+inline uint SparseArray::pop_front()
+{
+    uint idx = UINT_MAX ;
+
+    SparseArrayNode *n = findNode(0);
+    if (n) {
+        idx = n->value;
+        deleteNode(n);
+        // adjust all size_left indices on the path to leftmost item by 1
+        SparseArrayNode *n = root();
+        while (n) {
+            n->size_left -= 1;
+            n = n->left;
+        }
+    }
+    return idx;
+}
+
+inline void SparseArray::push_front(uint value)
+{
+    // adjust all size_left indices on the path to leftmost item by 1
+    SparseArrayNode *n = root();
+    while (n) {
+        n->size_left += 1;
+        n = n->left;
+    }
+    n = insert(0);
+    n->value = value;
+}
+
+inline uint SparseArray::pop_back(uint len)
+{
+    uint idx = UINT_MAX;
+    if (!len)
+        return idx;
+
+    SparseArrayNode *n = findNode(len - 1);
+    if (n) {
+        idx = n->value;
+        deleteNode(n);
+    }
+    return idx;
+}
+
+inline void SparseArray::push_back(uint index, uint len)
+{
+    SparseArrayNode *n = insert(len);
+    n->value = index;
+}
+
+#ifdef Q_MAP_DEBUG
+
+void SparseArray::dump() const
+{
+    const_iterator it = begin();
+    qDebug() << "map dump:";
+    while (it != end()) {
+        const SparseArrayNode *n = it.i;
+        int depth = 0;
+        while (n && n != root()) {
+            ++depth;
+            n = n->parent();
+        }
+        QByteArray space(4*depth, ' ');
+        qDebug() << space << (it.i->color() == SparseArrayNode::Red ? "Red  " : "Black") << it.i << it.i->left << it.i->right
+                 << it.key() << it.value();
+        ++it;
+    }
+    qDebug() << "---------";
+}
+#endif
+
+
+inline SparseArrayNode *SparseArray::erase(SparseArrayNode *n)
+{
+    if (n == end())
+        return n;
+
+    SparseArrayNode *next = n->nextNode();
+    deleteNode(n);
+    return next;
+}
+
+inline QList<int> SparseArray::keys() const
+{
+    QList<int> res;
+    res.reserve(numEntries);
+    SparseArrayNode *n = mostLeftNode;
+    while (n != end()) {
+        res.append(n->key());
+        n = n->nextNode();
+    }
+    return res;
+}
+
+inline const SparseArrayNode *SparseArray::lowerBound(uint akey) const
+{
+    const SparseArrayNode *lb = root()->lowerBound(akey);
+    if (!lb)
+        lb = end();
+    return lb;
+}
+
+
+inline SparseArrayNode *SparseArray::lowerBound(uint akey)
+{
+    SparseArrayNode *lb = root()->lowerBound(akey);
+    if (!lb)
+        lb = end();
+    return lb;
+}
+
+
+inline const SparseArrayNode *SparseArray::upperBound(uint akey) const
+{
+    const SparseArrayNode *ub = root()->upperBound(akey);
+    if (!ub)
+        ub = end();
+    return ub;
+}
+
+
+inline SparseArrayNode *SparseArray::upperBound(uint akey)
+{
+    SparseArrayNode *ub = root()->upperBound(akey);
+    if (!ub)
+        ub = end();
+    return ub;
+}
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QMAP_H