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diff --git a/vcl/source/edit/textdoc.hxx b/vcl/source/edit/textdoc.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_SOURCE_EDIT_TEXTDOC_HXX
+#define INCLUDED_VCL_SOURCE_EDIT_TEXTDOC_HXX
+
+#include <rtl/ustring.hxx>
+#include <vcl/textdata.hxx>
+#include <vcl/txtattr.hxx>
+#include <vector>
+#include <memory>
+
+class TextCharAttribList
+{
+private:
+    TextCharAttribList(const TextCharAttribList&) = delete;
+    TextCharAttribList& operator=(const TextCharAttribList&) = delete;
+
+    std::vector<std::unique_ptr<TextCharAttrib> > maAttribs;
+    bool            mbHasEmptyAttribs;
+
+public:
+                    TextCharAttribList();
+                    ~TextCharAttribList();
+
+    void            Clear();
+    sal_uInt16          Count() const               { return maAttribs.size(); }
+
+    const TextCharAttrib& GetAttrib( sal_uInt16 n ) const { return *maAttribs[n]; }
+    TextCharAttrib& GetAttrib( sal_uInt16 n )       { return *maAttribs[n]; }
+    std::unique_ptr<TextCharAttrib>  RemoveAttrib( sal_uInt16 n )
+    {
+        std::unique_ptr<TextCharAttrib> pReleased = std::move(maAttribs[n]);
+        maAttribs.erase( maAttribs.begin() + n );
+        return pReleased;
+    }
+
+    void            InsertAttrib( std::unique_ptr<TextCharAttrib> pAttrib );
+
+    void            DeleteEmptyAttribs();
+    void            ResortAttribs();
+
+    bool&           HasEmptyAttribs()       { return mbHasEmptyAttribs; }
+
+    TextCharAttrib* FindAttrib( sal_uInt16 nWhich, sal_Int32 nPos );
+    TextCharAttrib* FindEmptyAttrib( sal_uInt16 nWhich, sal_Int32 nPos );
+    bool            HasBoundingAttrib( sal_Int32 nBound );
+};
+
+class TextNode
+{
+    OUString            maText;
+    TextCharAttribList  maCharAttribs;
+
+    void                ExpandAttribs( sal_Int32 nIndex, sal_Int32 nNewChars );
+    void                CollapseAttribs( sal_Int32 nIndex, sal_Int32 nDelChars );
+
+public:
+                        TextNode( const OUString& rText );
+
+    TextNode( const TextNode& ) = delete;
+    void operator=( const TextNode& ) = delete;
+
+    const OUString&     GetText() const         { return maText; }
+
+    const TextCharAttrib&   GetCharAttrib(sal_uInt16 nPos) const  { return maCharAttribs.GetAttrib(nPos); }
+    const TextCharAttribList&   GetCharAttribs() const  { return maCharAttribs; }
+    TextCharAttribList&         GetCharAttribs()        { return maCharAttribs; }
+
+    void                InsertText( sal_Int32 nPos, const OUString& rText );
+    void                InsertText( sal_Int32 nPos, sal_Unicode c );
+    void                RemoveText( sal_Int32 nPos, sal_Int32 nChars );
+
+    std::unique_ptr<TextNode> Split( sal_Int32 nPos );
+    void                Append( const TextNode& rNode );
+};
+
+class TextDoc
+{
+    std::vector<std::unique_ptr<TextNode>>  maTextNodes;
+    sal_uInt16              mnLeftMargin;
+
+    void                DestroyTextNodes();
+
+public:
+                        TextDoc();
+                        ~TextDoc();
+
+    void                Clear();
+
+    std::vector<std::unique_ptr<TextNode>>&       GetNodes()              { return maTextNodes; }
+    const std::vector<std::unique_ptr<TextNode>>& GetNodes() const        { return maTextNodes; }
+
+    void                RemoveChars( const TextPaM& rPaM, sal_Int32 nChars );
+    TextPaM             InsertText( const TextPaM& rPaM, sal_Unicode c );
+    TextPaM             InsertText( const TextPaM& rPaM, const OUString& rStr );
+
+    TextPaM             InsertParaBreak( const TextPaM& rPaM );
+    TextPaM             ConnectParagraphs( TextNode* pLeft, const TextNode* pRight );
+
+    sal_Int32           GetTextLen( const sal_Unicode* pSep, const TextSelection* pSel = nullptr ) const;
+    OUString            GetText( const sal_Unicode* pSep ) const;
+    OUString            GetText( sal_uInt32 nPara ) const;
+
+    void                SetLeftMargin( sal_uInt16 n )   { mnLeftMargin = n; }
+    sal_uInt16          GetLeftMargin() const       { return mnLeftMargin; }
+
+    bool            IsValidPaM( const TextPaM& rPaM );
+};
+
+#endif // INCLUDED_VCL_SOURCE_EDIT_TEXTDOC_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */