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diff --git a/tools/qmlls/textdocument.h b/tools/qmlls/textdocument.h
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+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the tools applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#ifndef TEXTDOCUMENT_H
+#define TEXTDOCUMENT_H
+
+#include "textblock.h"
+
+#include <QtCore/qchar.h>
+#include <QtCore/qvector.h>
+#include <QtCore/qscopedpointer.h>
+#include <QtCore/qmutex.h>
+
+#include <optional>
+
+namespace Utils {
+
+class TextBlockUserData;
+
+class TextDocument
+{
+public:
+    TextDocument() = default;
+    explicit TextDocument(const QString &text);
+
+    TextBlock findBlockByNumber(int blockNumber) const;
+    TextBlock findBlockByLineNumber(int lineNumber) const;
+    QChar characterAt(int pos) const;
+    int characterCount() const;
+    TextBlock begin() const;
+    TextBlock firstBlock() const;
+    TextBlock lastBlock() const;
+
+    std::optional<int> version() const;
+    void setVersion(std::optional<int>);
+
+    QString toPlainText() const;
+    void setPlainText(const QString &text);
+
+    bool isModified() const;
+    void setModified(bool modified);
+
+    void setUndoRedoEnabled(bool enable);
+
+    void clear();
+
+    void setUserState(int blockNumber, int state);
+    int userState(int blockNumber) const;
+    QMutex *mutex() const;
+
+private:
+    struct Block
+    {
+        TextBlock textBlock;
+        int userState = -1;
+    };
+
+    QVector<Block> m_blocks;
+
+    QString m_content;
+    bool m_modified = false;
+    std::optional<int> m_version;
+    mutable QMutex m_mutex;
+};
+} // namespace Utils
+
+#endif // TEXTDOCUMENT_H