cpp-logger/include/logger/format.h

//
//  format.hpp
//  logger
//
//  Created by Sam Jaffe on 8/21/16.
//

#pragma once

#include <functional>
#include <sstream>
#include <string>
#include <vector>

#include "logger_fwd.h"
#include "wrapper_object.h"

namespace logging {
  class format {
  public:
    enum class token_id {
      DATE, PRIORITY, CATEGORY, MESSAGE, STRING, NEWLINE
    };
    
    using generator = std::function<void(logpacket const &, std::ostream &)>;
    
    static format parse_format_string(std::string const &);
    void process(logpacket const & pkt, std::ostream & os) const;
    std::string process(logpacket const & pkt) const;
  private:
    std::vector<generator> gen;
  };
    
  using string_generator = std::function<std::string(logpacket const &)>;
  string_generator get_date_formatter(std::string fmt);
    
  void format_msg(std::ostream & os, std::string const & interp, size_t pos,
                  std::vector<detail::object> const & objs, size_t idx);
  
  template <typename... Args>
  std::string format_msg(std::string const & interp, Args && ...args) {
    std::stringstream msg;
    format_msg(msg, interp, 0, {detail::object(args)...}, 0);
    return msg.str();
  }
}