ExpressionEvaluator.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef EXPRESSION_EVALUATOR_H
#define EXPRESSION_EVALUATOR_H
 
#include "CLHEP/Evaluator/Evaluator.h"
 
#include <string>
#include <string_view>
#include <vector>
#include <map>
 
namespace AGDD {
 
typedef std::map< std::string, double> ConstantsTable;
typedef std::map< std::string, double> PhysicalConstantsTable;
typedef std::map< std::string, std::string> ExpressionsTable;
 
class ExpressionEvaluator
{
public:
    ExpressionEvaluator();
    ~ExpressionEvaluator();
 
    bool RegisterConstant( std::string& c, double v );
    bool RegisterPhysConstant( std::string&, const std::string&, const std::string&  );
    bool RegisterExpression( std::string& c, const std::string& v  );
    bool RegisterArray( std::string& c, const std::vector<double>& v );
    bool RegisterVariable( const std::string& var_name, double value);
  
    double EvaluateString(const std::string& str);
    bool is_delimiter(char c);
    bool is_real_variable(const std::string& var_name);
    double Eval( std::string_view expr );
    
    static std::string trim(const std::string&);
    static std::vector<std::string> tokenize(const std::string&,const std::string&); 
  
    void setFileCurrentlyParsed(const std::string& set)
    {
        m_fileCurrentlyParsed = set;
    }
 
private:
    HepTool::Evaluator     m_calc;
    ConstantsTable         m_CTable;
    PhysicalConstantsTable m_PCTable;
    std::string m_fileCurrentlyParsed;
    std::vector<std::string> m_real_vars;
};
 
} // namespace AGDD
 
#endif // EXPRESSION_EVALUATOR_H