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diff --git a/src/declarative/qml/parser/javascriptengine_p.h b/src/declarative/qml/parser/javascriptengine_p.h
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+/**************************************************************************
+**
+** This file is part of Qt Creator
+**
+** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
+**
+** Contact:  Qt Software Information (qt-info@nokia.com)
+**
+** Commercial Usage
+**
+** Licensees holding valid Qt Commercial licenses may use this file in
+** accordance with the Qt Commercial License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Nokia.
+**
+** 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+**
+**************************************************************************/
+
+#ifndef JAVASCRIPTENGINE_P_H
+#define JAVASCRIPTENGINE_P_H
+
+#include "javascriptvalue.h"
+#include <QString>
+#include <QSet>
+
+QT_BEGIN_NAMESPACE
+
+namespace JavaScript {
+
+class Node;
+class Lexer;
+class NodePool;
+
+namespace AST {
+
+class Node;
+
+} // end of namespace AST
+
+namespace Ecma {
+
+class RegExp
+{
+public:
+    enum RegExpFlag {
+        Global     = 0x01,
+        IgnoreCase = 0x02,
+        Multiline  = 0x04
+    };
+
+public:
+    static int flagFromChar(const QChar &);
+    static QString flagsToString(int flags);
+};
+
+} // end of namespace Ecma
+
+} // end of namespace JavaScript
+
+
+
+class JavaScriptNameIdImpl
+{
+    QString _text;
+
+public:
+    JavaScriptNameIdImpl(const QChar *u, int s)
+        : _text(u, s)
+    { }
+
+    const QString asString() const
+    { return _text; }
+
+    bool operator == (const JavaScriptNameIdImpl &other) const
+    { return _text == other._text; }
+
+    bool operator != (const JavaScriptNameIdImpl &other) const
+    { return _text != other._text; }
+
+    bool operator < (const JavaScriptNameIdImpl &other) const
+    { return _text < other._text; }
+};
+
+inline uint qHash(const JavaScriptNameIdImpl &id)
+{ return qHash(id.asString()); }
+
+class JavaScriptEnginePrivate
+{
+    JavaScript::Lexer *_lexer;
+    JavaScript::NodePool *_nodePool;
+    JavaScript::AST::Node *_ast;
+    QSet<JavaScriptNameIdImpl> _literals;
+
+public:
+    JavaScriptEnginePrivate()
+        : _lexer(0), _nodePool(0), _ast(0)
+    { }
+
+    QSet<JavaScriptNameIdImpl> literals() const
+    { return _literals; }
+
+    JavaScriptNameIdImpl *intern(const QChar *u, int s)
+    { return const_cast<JavaScriptNameIdImpl *>(&*_literals.insert(JavaScriptNameIdImpl(u, s))); }
+
+    static QString toString(JavaScriptNameIdImpl *id)
+    { return id->asString(); }
+
+    JavaScript::Lexer *lexer() const
+    { return _lexer; }
+
+    void setLexer(JavaScript::Lexer *lexer)
+    { _lexer = lexer; }
+
+    JavaScript::NodePool *nodePool() const
+    { return _nodePool; }
+
+    void setNodePool(JavaScript::NodePool *nodePool)
+    { _nodePool = nodePool; }
+
+    JavaScript::AST::Node *ast() const
+    { return _ast; }
+
+    JavaScript::AST::Node *changeAbstractSyntaxTree(JavaScript::AST::Node *node)
+    {
+        JavaScript::AST::Node *previousAST = _ast;
+        _ast = node;
+        return previousAST;
+    }
+};
+
+QT_END_NAMESPACE
+
+#endif // JAVASCRIPTENGINE_P_H