EventReader.hh

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#pragma once
 
#include <cstddef>
#include <memory>
#include <string>
 
#include "HEJ/optional.hh"
 
namespace LHEF {
  class HEPEUP;
  class HEPRUP;
}
 
namespace HEJ {
 
  struct EventReader {
    virtual bool read_event() = 0;
 
    virtual std::string const & header() const = 0;
 
    virtual LHEF::HEPRUP const & heprup() const = 0;
 
    virtual LHEF::HEPEUP const & hepeup() const = 0;
 
    virtual optional<std::size_t> number_events() const {
      std::size_t start = header().rfind("Number of Events");
      start = header().find_first_of("123456789", start);
      if(start == std::string::npos) {
        return {};
      }
      const std::size_t end = header().find_first_not_of("0123456789", start);
      return std::stoi(header().substr(start, end - start));
    }
 
    virtual ~EventReader() = default;
  };
 
 
  std::unique_ptr<EventReader> make_reader(std::string const & filename);
} // namespace HEJ