/****************************************************************************

**

** 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.

**

**

**

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**

** $QT_END_LICENSE$

**

****************************************************************************/

#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