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diff --git a/formula/source/core/api/grammar.cxx b/formula/source/core/api/grammar.cxx
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+++ b/formula/source/core/api/grammar.cxx
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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 .
+ */
+
+#include <formula/grammar.hxx>
+#include <cassert>
+
+namespace formula {
+
+FormulaGrammar::Grammar FormulaGrammar::mapAPItoGrammar( const bool bEnglish, const bool bXML )
+{
+    Grammar eGrammar;
+    if (bEnglish && bXML)
+        eGrammar = GRAM_PODF;
+    else if (bEnglish && !bXML)
+        eGrammar = GRAM_API;
+    else if (!bEnglish && bXML)
+        eGrammar = GRAM_NATIVE_ODF;
+    else // (!bEnglish && !bXML)
+        eGrammar = GRAM_NATIVE;
+    return eGrammar;
+}
+
+bool FormulaGrammar::isSupported( const Grammar eGrammar )
+{
+    switch (eGrammar)
+    {
+        case GRAM_ODFF           :
+        case GRAM_PODF           :
+        case GRAM_ENGLISH        :
+        case GRAM_NATIVE         :
+        case GRAM_ODFF_UI        :
+        case GRAM_ODFF_A1        :
+        case GRAM_PODF_UI        :
+        case GRAM_PODF_A1        :
+        case GRAM_NATIVE_UI      :
+        case GRAM_NATIVE_ODF     :
+        case GRAM_NATIVE_XL_A1   :
+        case GRAM_NATIVE_XL_R1C1 :
+        case GRAM_ENGLISH_XL_A1  :
+        case GRAM_ENGLISH_XL_R1C1:
+        case GRAM_ENGLISH_XL_OOX :
+        case GRAM_OOXML          :
+        case GRAM_API            :
+            return true;
+        default:
+            return extractFormulaLanguage( eGrammar) == GRAM_EXTERNAL;
+    }
+}
+
+FormulaGrammar::Grammar FormulaGrammar::setEnglishBit( const Grammar eGrammar, const bool bEnglish )
+{
+    if (bEnglish)
+        return static_cast<Grammar>( eGrammar | kEnglishBit);
+    else
+        return static_cast<Grammar>( eGrammar & ~kEnglishBit);
+}
+
+FormulaGrammar::Grammar FormulaGrammar::mergeToGrammar( const Grammar eGrammar, const AddressConvention eConv )
+{
+    bool bEnglish = isEnglish( eGrammar);
+    Grammar eGram = static_cast<Grammar>(
+            extractFormulaLanguage( eGrammar) |
+            ((eConv + kConventionOffset) << kConventionShift));
+    eGram = setEnglishBit( eGram, bEnglish);
+    assert( isSupported( eGram));
+    return eGram;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */