Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+** Copyright (C) 2001-2004 Roberto Raggi
+**
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef TOKENSTREAMADAPTER_H
+#define TOKENSTREAMADAPTER_H
+
+#include "tokenengine.h"
+#include "tokens.h"
+
+#include <QVector>
+
+QT_BEGIN_NAMESPACE
+
+namespace TokenStreamAdapter {
+struct TokenStream
+{
+    TokenStream(TokenEngine::TokenSectionSequence translationUnit, QVector<Type> tokenKindList)
+    :m_translationUnit(translationUnit),
+     m_tokenKindList(tokenKindList),
+     m_cursor(0),
+     m_numTokens(tokenKindList.count())
+    {
+        Q_ASSERT(translationUnit.count() == m_numTokens);
+
+        // Copy out the container and containerIndex for each token so we can have
+        // constant time random access to it.
+        TokenEngine::TokenSectionSequenceIterator it(translationUnit);
+        while(it.nextToken()) {
+            m_tokenContainers.append(it.tokenContainer());
+            m_containerIndices.append(it.containerIndex());
+        }
+    }
+
+    bool isHidden(int index) const
+    {
+       if(index >= m_numTokens)
+            return false;
+        QT_PREPEND_NAMESPACE(Type) type = m_tokenKindList.at(index);
+        return (type == Token_whitespaces || type == 10 /*newline*/ ||
+                type == Token_comment || type == Token_preproc );
+    }
+
+    inline int lookAhead(int n = 0) const
+    {
+        if(m_cursor + n >= m_numTokens)
+            return 0;
+        return m_tokenKindList.at(m_cursor + n);
+    }
+
+    inline int currentToken() const
+    { return lookAhead(); }
+
+    inline QByteArray currentTokenText() const
+    {
+        return tokenText(m_cursor);
+    }
+
+    inline TokenEngine::TokenContainer tokenContainer(int index = 0) const
+    {
+        if (index < m_numTokens)
+            return m_tokenContainers.at(index);
+        else
+            return TokenEngine::TokenContainer();
+    }
+
+    inline int containerIndex(int index = 0) const
+    {
+        if (index < m_numTokens)
+            return m_containerIndices.at(index);
+        else
+            return -1;
+    }
+
+    inline QByteArray tokenText(int index = 0) const
+    {
+        if (index <  m_numTokens) {
+            const TokenEngine::TokenContainer container = tokenContainer(index);
+            const int cIndex = containerIndex(index);
+            return container.text(cIndex);
+        } else {
+            return QByteArray();
+        }
+    }
+
+    inline void rewind(int index)
+    { m_cursor = index; }
+
+    inline int cursor() const
+    { return m_cursor; }
+
+    inline void nextToken()
+    { ++m_cursor; }
+
+    inline bool tokenAtEnd()
+    { return m_cursor >= m_numTokens; }
+
+    TokenEngine::TokenSectionSequence tokenSections() const
+    { return m_translationUnit;  }
+
+private:
+   TokenEngine::TokenSectionSequence m_translationUnit;
+   QVector<Type> m_tokenKindList;
+   QList<TokenEngine::TokenContainer> m_tokenContainers;
+   QList<int> m_containerIndices;
+   int m_cursor;
+   int m_numTokens;
+};
+
+} //namespace TokenStreamAdapter
+
+QT_END_NAMESPACE
+
+#endif