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diff --git a/tools/porting/src/translationunit.h b/tools/porting/src/translationunit.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 TRANSLATIONUNIT_H
+#define TRANSLATIONUNIT_H
+
+#include "tokenengine.h"
+#include "tokenstreamadapter.h"
+#include "ast.h"
+#include "codemodel.h"
+#include "smallobject.h"
+#include "cpplexer.h"
+#include "parser.h"
+#include "semantic.h"
+#include <QSharedData>
+
+QT_BEGIN_NAMESPACE
+
+class TranslationUnitData : public QSharedData
+{
+public:
+    TranslationUnitData(const TokenEngine::TokenSectionSequence &t)
+    :tokens(t),  globalScope(0) {};
+    TokenEngine::TokenSectionSequence tokens;
+    CodeModel::NamespaceScope *globalScope;
+    TypedPool<CodeModel::Item> codeModelMemoryPool;
+};
+
+class TranslationUnit
+{
+public:
+    TranslationUnit();
+    TranslationUnit(const TokenEngine::TokenSectionSequence &tokens);
+    TokenEngine::TokenSectionSequence tokens() const;
+    CodeModel::NamespaceScope *codeModel();
+    TypedPool<CodeModel::Item> *codeModelMemoryPool();
+private:
+    friend class TranslationUnitAnalyzer;
+    void setCodeModel(CodeModel::NamespaceScope *globalScope);
+    QExplicitlySharedDataPointer<TranslationUnitData> d;
+};
+
+class TranslationUnitAnalyzer
+{
+public:
+    TranslationUnit analyze
+            (const TokenEngine::TokenSectionSequence &translationUnitTokens, int targetMaxASTNodes = 10000);
+private:
+    CppLexer lexer;
+    Parser parser;
+};
+
+QT_END_NAMESPACE
+
+#endif