ExpressionParser.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/

// ExpressionParser.h, (c) ATLAS Detector software
// Author: Thomas Gillam (thomas.gillam@cern.ch)
// ExpressionParsing library
 
#ifndef EXPRESSION_PARSER_H
#define EXPRESSION_PARSER_H
 
#include "ExpressionEvaluation/StackElement.h"
#include "ExpressionEvaluation/IProxyLoader.h"
#include "ExpressionEvaluation/IUnitInterpreter.h"
#include "ExpressionEvaluation/MultipleProxyLoader.h"
 
#include "StoreGate/ReadDecorHandle.h"
#include "AthContainers/AuxVectorBase.h"
 
#include <sstream>
#include <stdexcept>
 
namespace ExpressionParsing {
  class VirtualMachine;
 
  class ExpressionParser
  {
    public:
      ExpressionParser();
      ExpressionParser(IProxyLoader *proxyLoader);
      ExpressionParser(IUnitInterpreter *unitInterpreter);
      ExpressionParser(IProxyLoader *proxyLoader, IUnitInterpreter *unitInterpreter);
      ~ExpressionParser();
 
      ExpressionParser (const ExpressionParser&) = delete;
      ExpressionParser& operator= (const ExpressionParser&) = delete;
 
      bool loadExpression(const std::string &expression);
      StackElement evaluate() const;
      StackElement evaluate(const EventContext& ctx) const;
      bool evaluateAsBool() const;
      double evaluateAsDouble() const;
      std::vector<int> evaluateAsVector() const;
      std::vector<std::string> getVariables() const;
 
    private:
      void setup();
 
    private:
      IProxyLoader *m_proxyLoader;
      IUnitInterpreter *m_unitInterpreter;
      std::vector<StackElement> m_code;
      VirtualMachine *m_vm;
  };
}
 
#endif // EXPRESSION_PARSER_H