Evaluator.h

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// -*- C++ -*-
// ---------------------------------------------------------------------------
 
#ifndef HEP_EVALUATOR_H
#define HEP_EVALUATOR_H
 
#include <string>
 
namespace HepTool {
 
class Evaluator {
 public: 
 
  enum {
    OK,                         
    WARNING_EXISTING_VARIABLE,  
    WARNING_EXISTING_FUNCTION,  
    WARNING_BLANK_STRING,       
    ERROR_NOT_A_NAME,           
    ERROR_SYNTAX_ERROR,         
    ERROR_UNPAIRED_PARENTHESIS, 
    ERROR_UNEXPECTED_SYMBOL,    
    ERROR_UNKNOWN_VARIABLE,     
    ERROR_UNKNOWN_FUNCTION,     
    ERROR_EMPTY_PARAMETER,      
    ERROR_CALCULATION_ERROR     
  };
 
  Evaluator();
 
  ~Evaluator(); 
 
  double evaluate(const char * expression);
 
  int status() const;
 
  int error_position() const; 
 
  void print_error() const;
  std::string error_name() const;
 
  void setVariable(const char * name, double value);
 
  void setVariable(const char * name, const char * expression);
 
  void setFunction(const char * name, double (*fun)());
 
  void setFunction(const char * name, double (*fun)(double));
 
  void setFunction(const char * name, double (*fun)(double,double));
 
  void setFunction(const char * name, double (*fun)(double,double,double));
 
  void setFunction(const char * name,
           double (*fun)(double,double,double,double));
 
  void setFunction(const char * name,
                   double (*fun)(double,double,double,double,double));
 
  bool findVariable(const char * name) const;
 
  bool findFunction(const char * name, int npar) const;
 
  void removeVariable(const char * name);
 
  void removeFunction(const char * name, int npar);
 
  void clear();
 
  void setStdMath();
 
  void setSystemOfUnits(double meter    = 1.0,
                        double kilogram = 1.0,
                        double second   = 1.0,
                        double ampere   = 1.0,
                        double kelvin   = 1.0,
                        double mole     = 1.0,
                        double candela  = 1.0);
 
private: 
  void * p;                                 // private data 
  Evaluator(const Evaluator &);             // copy constructor is not allowed
  Evaluator & operator=(const Evaluator &); // assignment is not allowed
};
 
} // namespace HepTool
 
#endif /* HEP_EVALUATOR_H */