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+/*************************************************************************
+ *
+ *  $RCSfile: astexpression.hxx,v $
+ *
+ *  $Revision: 1.1 $
+ *
+ *  last change: $Author: jsc $ $Date: 2001-03-15 12:23:01 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (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.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+#ifndef _IDLC_ASTEXPRESSION_HXX_
+#define _IDLC_ASTEXPRESSION_HXX_
+
+#ifndef _IDLC_IDLC_HXX_
+#include <idlc/idlc.hxx>
+#endif
+
+// 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 the different kinds of evaluation possible
+enum EvalKind
+{
+    EK_const,           // Must evaluate to constant
+    EK_positive_int     // Must evaluate to positive integer
+};
+
+// 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
+    ET_pseudo       // Expression value is pseudo (for keywords)
+};
+
+// 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
+        sal_Bool        bval;       // Contains boolean expression value
+        float           fval;       // Contains 32-bit float expr value
+        double          dval;       // Contains 64-bit float expr value
+        sal_Char        cval;       // Contains char expression value
+        ::rtl::OString* strval;     // Contains String * expr value
+        sal_uInt32      eval;       // Contains enumeration value
+    } u;
+    ExprType et;
+};
+
+sal_Char* SAL_CALL exprTypeToString(ExprType t);
+
+class AstExpression
+{
+public:
+    // Constructor(s)
+    AstExpression(AstExpression *pExpr, ExprType et);
+    AstExpression(ExprComb c, AstExpression *pExpr1, AstExpression *pExpr2);
+
+    AstExpression(sal_Int16         s);
+    AstExpression(sal_uInt16        us);
+    AstExpression(sal_Int32         l);
+    AstExpression(sal_Int32         l, ExprType et);
+    AstExpression(sal_uInt32        ul);
+    AstExpression(sal_Int64         h);
+    AstExpression(sal_uInt64        uh);
+    AstExpression(float             f);
+    AstExpression(double            d);
+    AstExpression(sal_Char          c);
+    AstExpression(::rtl::OString* s, sal_Bool bIsScopedName = sal_False);
+
+    virtual ~AstExpression();
+
+    // Data Accessors
+    AstScope* getScope()
+        { return m_pScope; }
+    void setScope(AstScope* pScope)
+        { m_pScope = pScope; }
+    sal_Int32 getLine()
+        { return m_lineNo; }
+    void setLine(sal_Int32 l)
+        { m_lineNo = l; }
+    const ::rtl::OString& getFileName()
+        { return m_fileName; }
+    void setFileName(const ::rtl::OString& fileName)
+        { m_fileName = fileName; }
+    ExprComb getCombOperator()
+        { return m_combOperator; }
+    void setCombOperator(ExprComb new_ec)
+        { m_combOperator = new_ec; }
+    AstExprValue* getExprValue()
+        { return m_exprValue; }
+    void setExprValue(AstExprValue *pEv)
+        { m_exprValue = pEv; }
+    AstExpression* getExpr1()
+        { return m_subExpr1; }
+    void setExpr1(AstExpression *pExpr)
+        { m_subExpr1 = pExpr; }
+    AstExpression* getExpr2()
+        { return m_subExpr2; }
+    void setExpr2(AstExpression *pExpr)
+        { m_subExpr2 = pExpr; }
+    ::rtl::OString* getSymbolicName()
+        { return m_pSymbolicName; }
+    void setSymbolicName(::rtl::OString* pSymbolicName)
+        { m_pSymbolicName = pSymbolicName; }
+
+    // Evaluation and value coercion
+    AstExprValue* eval(EvalKind ek);
+    AstExprValue* coerce(ExprType type, sal_Bool bAssign=sal_True);
+
+    // Evaluate then store value inside this AstExpression
+    void evaluate(EvalKind ek);
+
+    // Compare to AstExpressions
+    sal_Bool operator==(AstExpression *pExpr);
+    sal_Bool compare(AstExpression *pExpr);
+
+    ::rtl::OString toString();
+    void dump() {}
+private:
+    // Fill out the lineno, filename and definition scope details
+    void    fillDefinitionDetails();
+    // Internal evaluation
+    AstExprValue* eval_internal(EvalKind ek);
+    // Evaluate different sets of operators
+    AstExprValue* eval_bin_op(EvalKind ek);
+    AstExprValue* eval_bit_op(EvalKind ek);
+    AstExprValue* eval_un_op(EvalKind ek);
+    AstExprValue* eval_symbol(EvalKind ek);
+
+    AstScope*       m_pScope;       // scope defined in
+    sal_Int32       m_lineNo;       // line number defined in
+    ::rtl::OString  m_fileName;     // fileName defined in
+
+    ExprComb        m_combOperator;
+    AstExpression*  m_subExpr1;
+    AstExpression*  m_subExpr2;
+    AstExprValue*   m_exprValue;
+    ::rtl::OString* m_pSymbolicName;
+};
+
+#endif // _IDLC_ASTEXPRESSION_HXX_
+