logging.h

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// Copyright (c) 2018 Doyub Kim
//
// I am making my contributions/submissions to this project solely in my
// personal capacity and am not conveying any rights to any intellectual
// property of any third parties.
 
#ifndef INCLUDE_JET_LOGGING_H_
#define INCLUDE_JET_LOGGING_H_
 
#include <iostream>
#include <sstream>
#include <string>
 
namespace jet {
 
enum class LoggingLevel : uint8_t {
    All = 0,
    Debug = 1,
    Info = 2,
    Warn = 3,
    Error = 4,
    Off = 5
};
 
class Logger final {
 public:
    explicit Logger(LoggingLevel level);
 
    ~Logger();
 
    template <typename T>
    const Logger& operator<<(const T& x) const {
        _buffer << x;
        return *this;
    }
 
 private:
    LoggingLevel _level;
    mutable std::stringstream _buffer;
};
 
class Logging {
 public:
    static void setInfoStream(std::ostream* strm);
 
    static void setWarnStream(std::ostream* strm);
 
    static void setErrorStream(std::ostream* strm);
 
    static void setDebugStream(std::ostream* strm);
 
    static void setAllStream(std::ostream* strm);
 
    static std::string getHeader(LoggingLevel level);
 
    static void setLevel(LoggingLevel level);
 
    static void mute();
 
    static void unmute();
};
 
extern Logger infoLogger;
 
extern Logger warnLogger;
 
extern Logger errorLogger;
 
extern Logger debugLogger;
 
#define JET_INFO \
    (Logger(LoggingLevel::Info) << Logging::getHeader(LoggingLevel::Info) \
     << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
#define JET_WARN \
    (Logger(LoggingLevel::Warn) << Logging::getHeader(LoggingLevel::Warn) \
     << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
#define JET_ERROR \
    (Logger(LoggingLevel::Error) << Logging::getHeader(LoggingLevel::Error) \
     << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
#define JET_DEBUG \
    (Logger(LoggingLevel::Debug) << Logging::getHeader(LoggingLevel::Debug) \
     << "[" << __FILE__ << ":" << __LINE__ << " (" << __func__ << ")] ")
 
}  // namespace jet
 
#endif  // INCLUDE_JET_LOGGING_H_