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diff --git a/sc/source/filter/inc/xeformula.hxx b/sc/source/filter/inc/xeformula.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 .
+ */
+
+#pragma once
+
+#include "xlformula.hxx"
+#include "xeroot.hxx"
+#include <memory>
+
+struct XclAddress;
+
+// External reference log =====================================================
+
+/** Log entry for external references in a formula, used i.e. in change tracking. */
+struct XclExpRefLogEntry
+{
+    const XclExpString* mpUrl;              /// URL of the document containing the first sheet.
+    const XclExpString* mpFirstTab;         /// Name of the first sheet.
+    const XclExpString* mpLastTab;          /// Name of the last sheet.
+    sal_uInt16          mnFirstXclTab;      /// Calc index of the first sheet.
+    sal_uInt16          mnLastXclTab;       /// Calc index of the last sheet.
+
+    explicit            XclExpRefLogEntry();
+};
+
+/** Vector containing a log for all external references in a formula, used i.e. in change tracking. */
+typedef ::std::vector< XclExpRefLogEntry > XclExpRefLog;
+
+// Formula compiler ===========================================================
+
+class ScRangeList;
+class XclExpFmlaCompImpl;
+
+/** The formula compiler to create Excel token arrays from Calc token arrays. */
+class XclExpFormulaCompiler : protected XclExpRoot
+{
+public:
+    explicit            XclExpFormulaCompiler( const XclExpRoot& rRoot );
+    virtual             ~XclExpFormulaCompiler() override;
+
+    /** Creates and returns the token array of a formula. */
+    XclTokenArrayRef    CreateFormula(
+                            XclFormulaType eType, const ScTokenArray& rScTokArr,
+                            const ScAddress* pScBasePos = nullptr, XclExpRefLog* pRefLog = nullptr );
+
+    /** Creates and returns a token array containing a single cell address. */
+    XclTokenArrayRef    CreateFormula( XclFormulaType eType, const ScAddress& rScPos );
+
+    /** Creates and returns a token array containing a single cell range address. */
+    XclTokenArrayRef    CreateFormula( XclFormulaType eType, const ScRange& rScRange );
+
+    /** Creates and returns the token array for a cell range list. */
+    XclTokenArrayRef    CreateFormula( XclFormulaType eType, const ScRangeList& rScRanges );
+
+    /** Creates a single error token containing the passed error code. */
+    XclTokenArrayRef    CreateErrorFormula( sal_uInt8 nErrCode );
+
+    /** Creates a single token for a special cell reference.
+        @descr  This is used for array formulas and shared formulas (token tExp),
+            and multiple operation tables (token tTbl). */
+    XclTokenArrayRef    CreateSpecialRefFormula( sal_uInt8 nTokenId, const XclAddress& rXclPos );
+
+    /** Creates a single tNameXR token for a reference to an external name.
+        @descr  This is used i.e. for linked macros in push buttons. */
+    XclTokenArrayRef    CreateNameXFormula( sal_uInt16 nExtSheet, sal_uInt16 nExtName );
+
+    bool IsRef2D( const ScSingleRefData& rRefData ) const;
+    bool IsRef2D( const ScComplexRefData& rRefData ) const;
+
+private:
+    typedef std::shared_ptr< XclExpFmlaCompImpl > XclExpFmlaCompImplRef;
+    XclExpFmlaCompImplRef mxImpl;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */