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diff --git a/src/tools/moc/symbols.h b/src/tools/moc/symbols.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 tools applications 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 SYMBOLS_H
+#define SYMBOLS_H
+
+#include "token.h"
+#include <QString>
+#include <QHash>
+#include <QVector>
+#include <QDebug>
+
+QT_BEGIN_NAMESPACE
+
+//#define USE_LEXEM_STORE
+
+struct SubArray
+{
+    inline SubArray():from(0),len(-1){}
+    inline SubArray(const QByteArray &a):array(a),from(0), len(a.size()){}
+    inline SubArray(const char *s):array(s),from(0) { len = array.size(); }
+    inline SubArray(const QByteArray &a, int from, int len):array(a), from(from), len(len){}
+    QByteArray array;
+    int from, len;
+    inline bool operator==(const SubArray &other) const {
+        if (len != other.len)
+            return false;
+        for (int i = 0; i < len; ++i)
+            if (array.at(from + i) != other.array.at(other.from + i))
+                return false;
+        return true;
+    }
+};
+
+inline uint qHash(const SubArray &key)
+{
+    const uchar *p = reinterpret_cast<const uchar *>(key.array.data() + key.from);
+    int n = key.len;
+    uint h = 0;
+    uint g;
+
+    while (n--) {
+        h = (h << 4) + *p++;
+        if ((g = (h & 0xf0000000)) != 0)
+            h ^= g >> 23;
+        h &= ~g;
+    }
+    return h;
+}
+
+
+struct Symbol
+{
+
+#ifdef USE_LEXEM_STORE
+    typedef QHash<SubArray, QHashDummyValue> LexemStore;
+    static LexemStore lexemStore;
+
+    inline Symbol() : lineNum(-1),token(NOTOKEN){}
+    inline Symbol(int lineNum, Token token):
+        lineNum(lineNum), token(token){}
+    inline Symbol(int lineNum, Token token, const QByteArray &lexem):
+        lineNum(lineNum), token(token),lex(lexem){}
+    inline Symbol(int lineNum, Token token, const QByteArray &lexem, int from, int len):
+        lineNum(lineNum), token(token){
+        LexemStore::const_iterator it = lexemStore.constFind(SubArray(lexem, from, len));
+
+        if (it != lexemStore.constEnd()) {
+            lex = it.key().array;
+        } else {
+            lex = lexem.mid(from, len);
+            lexemStore.insert(lex, QHashDummyValue());
+        }
+    }
+    int lineNum;
+    Token token;
+    inline QByteArray unquotedLexem() const { return lex.mid(1, lex.length()-2); }
+    inline QByteArray lexem() const { return lex; }
+    inline operator QByteArray() const { return lex; }
+    QByteArray lex;
+
+#else
+
+    inline Symbol() : lineNum(-1),token(NOTOKEN), from(0),len(-1) {}
+    inline Symbol(int lineNum, Token token):
+        lineNum(lineNum), token(token), from(0), len(-1) {}
+    inline Symbol(int lineNum, Token token, const QByteArray &lexem):
+        lineNum(lineNum), token(token), lex(lexem), from(0) { len = lex.size(); }
+    inline Symbol(int lineNum, Token token, const QByteArray &lexem, int from, int len):
+        lineNum(lineNum), token(token),lex(lexem),from(from), len(len){}
+    int lineNum;
+    Token token;
+    inline QByteArray lexem() const { return lex.mid(from, len); }
+    inline QByteArray unquotedLexem() const { return lex.mid(from+1, len-2); }
+    inline operator QByteArray() const { return lex.mid(from, len); }
+    inline operator SubArray() const { return SubArray(lex, from, len); }
+    QByteArray lex;
+    int from, len;
+
+#endif
+};
+Q_DECLARE_TYPEINFO(Symbol, Q_MOVABLE_TYPE);
+
+
+typedef QVector<Symbol> Symbols;
+
+QT_END_NAMESPACE
+
+#endif // SYMBOLS_H