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diff --git a/src/libs/qmljs/qmljsscopechain.h b/src/libs/qmljs/qmljsscopechain.h
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+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2011 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact: Nokia Corporation ([email protected])
+**
+**
+** GNU Lesser General Public License Usage
+**
+** 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.
+**
+** Other Usage
+**
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at [email protected].
+**
+**************************************************************************/
+
+#ifndef QMLJS_SCOPECHAIN_H
+#define QMLJS_SCOPECHAIN_H
+
+#include "qmljs_global.h"
+#include "qmljsdocument.h"
+#include "qmljscontext.h"
+
+#include <QtCore/QList>
+#include <QtCore/QSharedPointer>
+
+namespace QmlJS {
+namespace Interpreter {
+
+class ObjectValue;
+class TypeScope;
+class JSImportScope;
+class Context;
+class Value;
+
+class QMLJS_EXPORT QmlComponentChain
+{
+    Q_DISABLE_COPY(QmlComponentChain)
+public:
+    QmlComponentChain(const Document::Ptr &document);
+    ~QmlComponentChain();
+
+    Document::Ptr document() const;
+    QList<const QmlComponentChain *> instantiatingComponents() const;
+
+    // takes ownership
+    void addInstantiatingComponent(const QmlComponentChain *component);
+
+private:
+    QList<const QmlComponentChain *> m_instantiatingComponents;
+    Document::Ptr m_document;
+};
+
+// scope chains are copyable
+// constructing a new scope chain is currently too expensive:
+// building the instantiating component chain needs to be sped up
+class QMLJS_EXPORT ScopeChain
+{
+public:
+    explicit ScopeChain(const Document::Ptr &document, const Context *context);
+
+    Document::Ptr document() const;
+    const Context *context() const;
+
+    const Value *lookup(const QString &name, const ObjectValue **foundInScope = 0) const;
+
+    const ObjectValue *globalScope() const;
+    void setGlobalScope(const ObjectValue *globalScope);
+
+    QSharedPointer<const QmlComponentChain> qmlComponentChain() const;
+    void setQmlComponentChain(const QSharedPointer<const QmlComponentChain> &qmlComponentChain);
+
+    QList<const ObjectValue *> qmlScopeObjects() const;
+    void setQmlScopeObjects(const QList<const ObjectValue *> &qmlScopeObjects);
+
+    const TypeScope *qmlTypes() const;
+    void setQmlTypes(const TypeScope *qmlTypes);
+
+    const JSImportScope *jsImports() const;
+    void setJsImports(const JSImportScope *jsImports);
+
+    QList<const ObjectValue *> jsScopes() const;
+    void setJsScopes(const QList<const ObjectValue *> &jsScopes);
+
+    QList<const ObjectValue *> all() const;
+
+private:
+    void update() const;
+    void initializeRootScope();
+    void makeComponentChain(QmlComponentChain *target, const Snapshot &snapshot,
+                            QHash<Document *, QmlComponentChain *> *components);
+
+
+    Document::Ptr m_document;
+    const Context *m_context;
+
+    const ObjectValue *m_globalScope;
+    QSharedPointer<const QmlComponentChain> m_qmlComponentScope;
+    QList<const ObjectValue *> m_qmlScopeObjects;
+    const TypeScope *m_qmlTypes;
+    const JSImportScope *m_jsImports;
+    QList<const ObjectValue *> m_jsScopes;
+
+    bool m_modified;
+    mutable QList<const ObjectValue *> m_all;
+};
+
+} // namespace Interpreter
+} // namespace QmlJS
+
+#endif // QMLJS_SCOPECHAIN_H