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diff --git a/tools/porting/src/rpptreeevaluator.h b/tools/porting/src/rpptreeevaluator.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the qt3to4 porting application 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef RPPTREEEVALUATOR_H
+#define RPPTREEEVALUATOR_H
+
+#include "tokenengine.h"
+#include "rpp.h"
+#include "rpptreewalker.h"
+#include <QObject>
+#include <QList>
+#include <QHash>
+#include <QSet>
+
+QT_BEGIN_NAMESPACE
+
+namespace Rpp {
+
+class DefineMap : public QHash<QByteArray, const DefineDirective *>
+{
+
+};
+
+class RppTreeEvaluator: public QObject, public RppTreeWalker
+{
+Q_OBJECT
+public:
+    RppTreeEvaluator();
+    ~RppTreeEvaluator();
+    TokenEngine::TokenSectionSequence evaluate(const Source *source,
+                                              DefineMap *activedefinitions);
+    enum IncludeType {QuoteInclude, AngleBracketInclude};
+signals:
+    void includeCallback(Rpp::Source *&includee,
+                         const Rpp::Source *includer,
+                         const QString &filename,
+                         Rpp::RppTreeEvaluator::IncludeType includeType);
+protected:
+    void evaluateIncludeDirective(const IncludeDirective *directive);
+    void evaluateDefineDirective(const DefineDirective *directive);
+    void evaluateUndefDirective(const UndefDirective *directive);
+    void evaluateIfSection(const IfSection *ifSection);
+    void evaluateText(const Text *text);
+    bool evaluateCondition(const ConditionalDirective *conditionalDirective);
+    int evaluateExpression(Expression *expression);
+
+    TokenEngine::TokenContainer evaluateMacro(TokenEngine::TokenContainer tokenContainer, int &identiferTokenIndex);
+    TokenEngine::TokenContainer evaluateMacroInternal(QSet<QByteArray> skip, TokenEngine::TokenContainer tokenContainer);
+    TokenEngine::TokenContainer cloneTokenList(const TokenEngine::TokenList &list);
+    Source *getParentSource(const Item *item) const;
+    IncludeType includeTypeFromDirective(
+                    const IncludeDirective *includeDirective) const;
+private:
+    QVector<TokenEngine::TokenSection> m_tokenSections;
+    DefineMap *m_activeDefinitions;
+    TokenEngine::TokenSection *newlineSection;
+};
+
+class MacroFunctionParser
+{
+public:
+    MacroFunctionParser(const TokenEngine::TokenContainer &tokenContainer, int startToken);
+    bool isValid();
+    int tokenCount();
+    int argumentCount();
+    TokenEngine::TokenSection argument(int argumentIndex);
+private:
+    const TokenEngine::TokenContainer &m_tokenContainer;
+    const int m_startToken;
+    int m_numTokens;
+    bool m_valid;
+    QVector<TokenEngine::TokenSection> m_arguments;
+};
+
+}//namespace Rpp
+
+QT_END_NAMESPACE
+
+#endif