Logger.h

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/*
 *  CepGen: a central exclusive processes event generator
 *  Copyright (C) 2015-2023  Laurent Forthomme
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef CepGen_Utils_Logger_h
#define CepGen_Utils_Logger_h
 
#include <regex>
#include <vector>
 
namespace cepgen {
  namespace utils {
    class Logger {
    public:
      static Logger& get(std::ostream* = nullptr);
 
      void addExceptionRule(const std::string& rule);
      const std::vector<std::regex>& exceptionRules() const { return allowed_exc_; }
 
      typedef std::unique_ptr<std::ostream, std::function<void(std::ostream*)> > StreamHandler;
 
      enum class Level { nothing = 0, error, warning, information, debug, debugInsideLoop };
      bool passExceptionRule(const std::string& tmpl, const Level& lev) const;
      Level level() const { return level_; }
      void setLevel(Level level) { level_ = level; }
      bool extended() const { return extended_; }
      void setExtended(bool ext = true) { extended_ = ext; }
      bool isTTY() const;
 
      StreamHandler& output();
      void setOutput(std::ostream*);
 
    private:
      explicit Logger(StreamHandler);
 
      std::vector<std::regex> allowed_exc_;
      bool extended_{false};
      Level level_{Level::information};
      StreamHandler output_{nullptr};
    };
  }  // namespace utils
  std::ostream& operator<<(std::ostream& os, const utils::Logger::Level&);
}  // namespace cepgen
 
#define CG_LOG_MATCH(str, type) cepgen::utils::Logger::get().passExceptionRule(str, cepgen::utils::Logger::Level::type)
#define CG_LOG_LEVEL(type) cepgen::utils::Logger::get().setLevel(cepgen::utils::Logger::Level::type)
 
#endif