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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#
# httpstatus.rb -- HTTPStatus 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: httpstatus.rb,v 1.11 2003/03/24 20:18:55 gotoyuzo Exp $

module WEBrick

  module HTTPStatus

    class Status      < StandardError
      def initialize(*args)
        args[0] = AccessLog.escape(args[0]) unless args.empty?
        super(*args)
      end
      class << self
        attr_reader :code, :reason_phrase
      end
      def code() self::class::code end
      def reason_phrase() self::class::reason_phrase end
      alias to_i code
    end
    class Info        < Status; end
    class Success     < Status; end
    class Redirect    < Status; end
    class Error       < Status; end
    class ClientError < Error; end
    class ServerError < Error; end
    
    class EOFError < StandardError; end

    StatusMessage = {
      100, 'Continue',
      101, 'Switching Protocols',
      200, 'OK',
      201, 'Created',
      202, 'Accepted',
      203, 'Non-Authoritative Information',
      204, 'No Content',
      205, 'Reset Content',
      206, 'Partial Content',
      300, 'Multiple Choices',
      301, 'Moved Permanently',
      302, 'Found',
      303, 'See Other',
      304, 'Not Modified',
      305, 'Use Proxy',
      307, 'Temporary Redirect',
      400, 'Bad Request',
      401, 'Unauthorized',
      402, 'Payment Required',
      403, 'Forbidden',
      404, 'Not Found',
      405, 'Method Not Allowed',
      406, 'Not Acceptable',
      407, 'Proxy Authentication Required',
      408, 'Request Timeout',
      409, 'Conflict',
      410, 'Gone',
      411, 'Length Required',
      412, 'Precondition Failed',
      413, 'Request Entity Too Large',
      414, 'Request-URI Too Large',
      415, 'Unsupported Media Type',
      416, 'Request Range Not Satisfiable',
      417, 'Expectation Failed',
      500, 'Internal Server Error',
      501, 'Not Implemented',
      502, 'Bad Gateway',
      503, 'Service Unavailable',
      504, 'Gateway Timeout',
      505, 'HTTP Version Not Supported'
    }

    CodeToError = {}

    StatusMessage.each{|code, message|
      message.freeze
      var_name = message.gsub(/[ \-]/,'_').upcase
      err_name = message.gsub(/[ \-]/,'')

      case code
      when 100...200; parent = Info
      when 200...300; parent = Success
      when 300...400; parent = Redirect
      when 400...500; parent = ClientError
      when 500...600; parent = ServerError
      end

      const_set("RC_#{var_name}", code)
      err_class = Class.new(parent)
      err_class.instance_variable_set(:@code, code)
      err_class.instance_variable_set(:@reason_phrase, message)
      const_set(err_name, err_class)
      CodeToError[code] = err_class
    }

    def reason_phrase(code)
      StatusMessage[code.to_i]
    end
    def info?(code)
      code.to_i >= 100 and code.to_i < 200
    end
    def success?(code)
      code.to_i >= 200 and code.to_i < 300
    end
    def redirect?(code)
      code.to_i >= 300 and code.to_i < 400
    end
    def error?(code)
      code.to_i >= 400 and code.to_i < 600
    end
    def client_error?(code)
      code.to_i >= 400 and code.to_i < 500
    end
    def server_error?(code)
      code.to_i >= 500 and code.to_i < 600
    end

    def self.[](code)
      CodeToError[code]
    end

    module_function :reason_phrase
    module_function :info?, :success?, :redirect?, :error?
    module_function :client_error?, :server_error?
  end
end