Evaluator.h

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// $Id$
//==========================================================================
//  AIDA Detector description implementation for LCD
//--------------------------------------------------------------------------
// Copyright (C) Organisation europeenne pour la Recherche nucleaire (CERN)
// All rights reserved.
//
// For the licensing terms see $DD4hepINSTALL/LICENSE.
// For the list of contributors see $DD4hepINSTALL/doc/CREDITS.
//
//==========================================================================
// -*- C++ -*-
// $Id$
// ---------------------------------------------------------------------------

#ifndef XMLTOOLS_EVALUATOR_H
#define XMLTOOLS_EVALUATOR_H

namespace XmlTools {


  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;

    void setEnviron(const char* name, const char* value);
    const char* getEnviron(const char* name);
    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, double radians = 1.0 );

  private:
    void * p;                                 // private data
    Evaluator(const Evaluator &);             // copy constructor is not allowed
    Evaluator & operator=(const Evaluator &);   // assignment is not allowed
  };

}   // namespace XmlTools

#endif /* XMLTOOLS_EVALUATOR_H */