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/ruby34/share/rubygems/rubygems/resolver/
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Current File : //opt/alt/ruby34/share/rubygems/rubygems/resolver/index_specification.rb
# frozen_string_literal: true

##
# Represents a possible Specification object returned from IndexSet.  Used to
# delay needed to download full Specification objects when only the +name+
# and +version+ are needed.

class Gem::Resolver::IndexSpecification < Gem::Resolver::Specification
  ##
  # An IndexSpecification is created from the index format described in `gem
  # help generate_index`.
  #
  # The +set+ contains other specifications for this (URL) +source+.
  #
  # The +name+, +version+ and +platform+ are the name, version and platform of
  # the gem.

  def initialize(set, name, version, source, platform)
    super()

    @set = set
    @name = name
    @version = version
    @source = source
    @platform = Gem::Platform.new(platform.to_s)
    @original_platform = platform.to_s

    @spec = nil
  end

  ##
  # The dependencies of the gem for this specification

  def dependencies
    spec.dependencies
  end

  ##
  # The required_ruby_version constraint for this specification
  #
  # A fallback is included because when generated, some marshalled specs have it
  # set to +nil+.

  def required_ruby_version
    spec.required_ruby_version || Gem::Requirement.default
  end

  ##
  # The required_rubygems_version constraint for this specification
  #
  # A fallback is included because the original version of the specification
  # API didn't include that field, so some marshalled specs in the index have it
  # set to +nil+.

  def required_rubygems_version
    spec.required_rubygems_version || Gem::Requirement.default
  end

  def ==(other)
    self.class === other &&
      @name == other.name &&
      @version == other.version &&
      @platform == other.platform
  end

  def hash
    @name.hash ^ @version.hash ^ @platform.hash
  end

  def inspect # :nodoc:
    format("#<%s %s source %s>", self.class, full_name, @source)
  end

  def pretty_print(q) # :nodoc:
    q.group 2, "[Index specification", "]" do
      q.breakable
      q.text full_name

      unless @platform == Gem::Platform::RUBY
        q.breakable
        q.text @platform.to_s
      end

      q.breakable
      q.text "source "
      q.pp @source
    end
  end

  ##
  # Fetches a Gem::Specification for this IndexSpecification from the #source.

  def spec # :nodoc:
    @spec ||=
      begin
        tuple = Gem::NameTuple.new @name, @version, @original_platform

        @source.fetch_spec tuple
      end
  end
end