diff -r 000000000000 -r 1918ee327afb src/scripttools/debugging/qscriptobjectsnapshot.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/scripttools/debugging/qscriptobjectsnapshot.cpp	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,146 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtSCriptTools module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** 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, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qscriptobjectsnapshot_p.h"
+
+#include <QtCore/qmap.h>
+#include <QtCore/qset.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qnumeric.h>
+#include <QtScript/qscriptvalueiterator.h>
+
+QT_BEGIN_NAMESPACE
+
+QScriptObjectSnapshot::QScriptObjectSnapshot()
+{
+}
+
+QScriptObjectSnapshot::~QScriptObjectSnapshot()
+{
+}
+
+static bool _q_equal(const QScriptValue &v1, const QScriptValue &v2)
+{
+    if (v1.strictlyEquals(v2))
+        return true;
+    if (v1.isNumber() && v2.isNumber() && qIsNaN(v1.toNumber()) && qIsNaN(v2.toNumber()))
+        return true;
+    return false;
+}
+
+QScriptObjectSnapshot::Delta QScriptObjectSnapshot::capture(const QScriptValue &object)
+{
+    Delta result;
+    QMap<QString, QScriptValueProperty> currProps;
+    QHash<QString, int> propertyNameToIndex;
+    {
+        int i = 0;
+        QScriptValueIterator it(object);
+        while (it.hasNext()) {
+            it.next();
+            QScriptValueProperty prop(it.name(), it.value(), it.flags());
+            currProps.insert(it.name(), prop);
+            propertyNameToIndex.insert(it.name(), i);
+            ++i;
+        }
+        if (object.prototype().isValid()) {
+            QString __proto__ = QString::fromLatin1("__proto__");
+            QScriptValueProperty protoProp(
+                __proto__, object.prototype(),
+                QScriptValue::Undeletable | QScriptValue::ReadOnly);
+            currProps.insert(__proto__, protoProp);
+            propertyNameToIndex.insert(__proto__, i);
+            ++i;
+        }
+    }
+
+    QSet<QString> prevSet;
+    for (int i = 0; i < m_properties.size(); ++i)
+        prevSet.insert(m_properties.at(i).name());
+    QSet<QString> currSet = currProps.keys().toSet();
+    QSet<QString> removedProperties = prevSet - currSet;
+    QSet<QString> addedProperties = currSet - prevSet;
+    QSet<QString> maybeChangedProperties = currSet & prevSet;
+
+    {
+        QMap<int, QScriptValueProperty> am;
+        QSet<QString>::const_iterator it;
+        for (it = addedProperties.constBegin(); it != addedProperties.constEnd(); ++it) {
+            int idx = propertyNameToIndex[*it];
+            am[idx] = currProps[*it];
+        }
+        result.addedProperties = am.values();
+    }
+
+    {
+        QSet<QString>::const_iterator it;
+        for (it = maybeChangedProperties.constBegin(); it != maybeChangedProperties.constEnd(); ++it) {
+            const QScriptValueProperty &p1 = currProps[*it];
+            const QScriptValueProperty &p2 = findProperty(*it);
+            if (!_q_equal(p1.value(), p2.value())
+                || (p1.flags() != p2.flags())) {
+                result.changedProperties.append(p1);
+            }
+        }
+    }
+
+    result.removedProperties = removedProperties.toList();
+
+    m_properties = currProps.values();
+
+    return result;
+}
+
+QScriptValueProperty QScriptObjectSnapshot::findProperty(const QString &name) const
+{
+    for (int i = 0; i < m_properties.size(); ++i) {
+        if (m_properties.at(i).name() == name)
+            return m_properties.at(i);
+    }
+    return QScriptValueProperty();
+}
+
+QScriptValuePropertyList QScriptObjectSnapshot::properties() const
+{
+    return m_properties;
+}
+
+QT_END_NAMESPACE