# File lib/logging/config/configurator.rb, line 43
    def pre_config( config )
      if config.nil?
        ::Logging.init unless ::Logging.const_defined? 'MAX_LEVEL_LENGTH'
        return
      end

      # define levels
      levels = config[:levels]
      ::Logging.init(levels) unless levels.nil?

      # format as
      format = config[:format_as]
      ::Logging.format_as(format) unless format.nil?

      # backtrace
      value = config[:backtrace]
      ::Logging.backtrace(value) unless value.nil?
    end