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 // arith-exp.h - class to compile and evaluate logical/arithmetical expressions
 //
 /*
 Copyright 2005-2011 Tomas Mecir <kmuddy@kmuddy.com>
 Copyright 2005 Alex Bache <alexbache@ntlworld.com>
 
 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License as
 published by the Free Software Foundation; either version 2 of 
 the License, or (at your option) any later version.
 
 This program 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 General Public License for more details.
 
 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #ifndef ARITH_EXP_H
 #define ARITH_EXP_H
 
 #include <qstring.h>
 #include <list>
 
 #include <kmuddy_export.h>
 
 #include "instructions.h"
 
 using namespace std;
 
 
 //***************************************************************
 // Pure virtual base class for supplying variable values and
 // function call results
 //***************************************************************
 
 class KMUDDY_EXPORT arith_exp_server
 {
    public:
       virtual ~arith_exp_server();
       
       // implement this function in your derived class
       virtual cValue get (QString var_name) = 0;
 
       // implement this function in your derived class
       virtual cValue function_call(const QString &function_name,
                                    list<cValue> &arguments) = 0;
 
 }; // arith_exp_server
 
 
 
 //***************************************************************
 // Class to compile and evaluate logical/arithmetical expressions
 //***************************************************************
 
 class KMUDDY_EXPORT arith_exp
 {
    private:
       list<instruction> compiled_code;
       
       // Free resources used to store compiled code
       void clear_compiled();
       
    public:
       ~arith_exp();
       
       // Compiles an expression, returns true if successful
       bool compile (const QString &expression);
       
       // Returns result of executing compiled expression
       cValue evaluate(arith_exp_server *resolver);
       
 }; // arith_exp
 
 
 
 #endif // ARITH_EXP_H