晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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#
# log.rb -- Log Class
#
# Author: IPR -- Internet Programming with Ruby -- writers
# Copyright (c) 2000, 2001 TAKAHASHI Masayoshi, GOTOU Yuuzou
# Copyright (c) 2002 Internet Programming with Ruby writers. All rights
# reserved.
#
# $IPR: log.rb,v 1.26 2002/10/06 17:06:10 gotoyuzo Exp $

module WEBrick
  class BasicLog
    # log-level constant
    FATAL, ERROR, WARN, INFO, DEBUG = 1, 2, 3, 4, 5

    attr_accessor :level

    def initialize(log_file=nil, level=nil)
      @level = level || INFO
      case log_file
      when String
        @log = open(log_file, "a+")
        @log.sync = true
        @opened = true
      when NilClass
        @log = $stderr
      else
        @log = log_file  # requires "<<". (see BasicLog#log)
      end
    end

    def close
      @log.close if @opened
      @log = nil
    end

    def log(level, data)
      if @log && level <= @level
        data += "\n" if /\n\Z/ !~ data
        @log << data
      end
    end

    def <<(obj)
      log(INFO, obj.to_s)
    end

    def fatal(msg) log(FATAL, "FATAL " << format(msg)); end
    def error(msg) log(ERROR, "ERROR " << format(msg)); end
    def warn(msg)  log(WARN,  "WARN  " << format(msg)); end
    def info(msg)  log(INFO,  "INFO  " << format(msg)); end
    def debug(msg) log(DEBUG, "DEBUG " << format(msg)); end

    def fatal?; @level >= FATAL; end
    def error?; @level >= ERROR; end
    def warn?;  @level >= WARN; end
    def info?;  @level >= INFO; end
    def debug?; @level >= DEBUG; end

    private

    def format(arg)
      str = if arg.is_a?(Exception)
        "#{arg.class}: #{arg.message}\n\t" <<
        arg.backtrace.join("\n\t") << "\n"
      elsif arg.respond_to?(:to_str)
        arg.to_str
      else
        arg.inspect
      end
    end
  end

  class Log < BasicLog
    attr_accessor :time_format 

    def initialize(log_file=nil, level=nil)
      super(log_file, level)
      @time_format = "[%Y-%m-%d %H:%M:%S]"
    end

    def log(level, data)
      tmp = Time.now.strftime(@time_format)
      tmp << " " << data
      super(level, tmp)
    end
  end
end