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diff --git a/idlc/inc/astexpression.hxx b/idlc/inc/astexpression.hxx
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+++ b/idlc/inc/astexpression.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_IDLC_INC_ASTEXPRESSION_HXX
+#define INCLUDED_IDLC_INC_ASTEXPRESSION_HXX
+
+#include <sal/config.h>
+
+#include <memory>
+
+#include <idlc.hxx>
+
+// Enum to define all the different operators to combine expressions
+enum ExprComb
+{
+    EC_add,     // '+'
+    EC_minus,   // '-'
+    EC_mul,     // '*'
+    EC_div,     // '/'
+    EC_mod,     // '%'
+    EC_or,      // '|'
+    EC_xor,     // '^'
+    EC_and,     // '&'
+    EC_left,    // '<<'
+    EC_right,   // '>>'
+    EC_u_plus,  // unary '+'
+    EC_u_minus, // unary '-'
+    EC_bit_neg, // '~'
+    EC_none,    // No operator (missing)
+    EC_symbol   // a symbol (function or constant name)
+};
+
+// Enum to define expression type
+enum ExprType
+{
+    ET_short,       // Expression value is short
+    ET_ushort,      // Expression value is unsigned short
+    ET_long,        // Expression value is long
+    ET_ulong,       // Expression value is unsigned long
+    ET_hyper,       // Expression value is hyper (64 bit)
+    ET_uhyper,      // Expression value is unsigned hyper
+    ET_float,       // Expression value is 32-bit float
+    ET_double,      // Expression value is 64-bit float
+    ET_char,        // Expression value is char
+    ET_byte,        // Expression value is byte
+    ET_boolean,     // Expression value is boolean
+    ET_string,      // Expression value is char *
+    ET_any,         // Expression value is any of above
+    ET_void,        // Expression value is void (absent)
+    ET_type,        // Expression value is type
+    ET_none         // Expression value is missing
+};
+
+// Structure to describe value of constant expression and its type
+struct AstExprValue
+{
+    union
+    {
+        sal_uInt8       byval;      // Contains byte expression value
+        sal_Int16       sval;       // Contains short expression value
+        sal_uInt16      usval;      // Contains unsigned short expr value
+        sal_Int32       lval;       // Contains long expression value
+        sal_uInt32      ulval;      // Contains unsigned long expr value
+        sal_Int64       hval;       // Contains hyper expression value
+        sal_uInt64      uhval;      // Contains unsigned hyper expr value
+        bool            bval;       // Contains boolean expression value
+        float           fval;       // Contains 32-bit float expr value
+        double          dval;       // Contains 64-bit float expr value
+    } u;
+    ExprType et;
+};
+
+const sal_Char* SAL_CALL exprTypeToString(ExprType t);
+
+class AstExpression
+{
+public:
+    // Constructor(s)
+    AstExpression(ExprComb c, AstExpression *pExpr1, AstExpression *pExpr2);
+
+    AstExpression(sal_Int32         l);
+    AstExpression(sal_Int32         l, ExprType et);
+    AstExpression(sal_Int64         h);
+    AstExpression(sal_uInt64        uh);
+    AstExpression(double            d);
+    AstExpression(OString* scopedName);
+
+    virtual ~AstExpression();
+
+    // Data Accessors
+    ExprComb getCombOperator()
+        { return m_combOperator; }
+    AstExprValue* getExprValue()
+        { return m_exprValue; }
+
+    // Evaluation and value coercion
+    bool coerce(ExprType type);
+
+    // Evaluate then store value inside this AstExpression
+    void evaluate();
+
+    // Compare to AstExpressions
+    bool compare(AstExpression *pExpr);
+
+    OString toString();
+private:
+    // Fill out the lineno, filename and definition scope details
+    void    fillDefinitionDetails();
+    // Evaluate different sets of operators
+    std::unique_ptr<AstExprValue> eval_bin_op();
+    std::unique_ptr<AstExprValue> eval_bit_op();
+    std::unique_ptr<AstExprValue> eval_un_op();
+    AstExprValue* eval_symbol();
+
+    AstScope*       m_pScope;       // scope defined in
+    sal_Int32       m_lineNo;       // line number defined in
+    OString  m_fileName;     // fileName defined in
+
+    ExprComb        m_combOperator;
+    AstExpression*  m_subExpr1;
+    AstExpression*  m_subExpr2;
+    AstExprValue*   m_exprValue;
+    OString* m_pSymbolicName;
+};
+
+#endif // INCLUDED_IDLC_INC_ASTEXPRESSION_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */