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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DIR:/opt/alt/ruby32/share/rubygems/rubygems/resolver/
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Current File : //opt/alt/ruby32/share/rubygems/rubygems/resolver/set.rb
# frozen_string_literal: true

##
# Resolver sets are used to look up specifications (and their
# dependencies) used in resolution.  This set is abstract.

class Gem::Resolver::Set
  ##
  # Set to true to disable network access for this set

  attr_accessor :remote

  ##
  # Errors encountered when resolving gems

  attr_accessor :errors

  ##
  # When true, allows matching of requests to prerelease gems.

  attr_accessor :prerelease

  def initialize # :nodoc:
    @prerelease = false
    @remote     = true
    @errors     = []
  end

  ##
  # The find_all method must be implemented.  It returns all Resolver
  # Specification objects matching the given DependencyRequest +req+.

  def find_all(req)
    raise NotImplementedError
  end

  ##
  # The #prefetch method may be overridden, but this is not necessary.  This
  # default implementation does nothing, which is suitable for sets where
  # looking up a specification is cheap (such as installed gems).
  #
  # When overridden, the #prefetch method should look up specifications
  # matching +reqs+.

  def prefetch(reqs)
  end

  ##
  # When true, this set is allowed to access the network when looking up
  # specifications or dependencies.

  def remote? # :nodoc:
    @remote
  end
end