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/lock_specification.rb
# frozen_string_literal: true

##
# The LockSpecification comes from a lockfile (Gem::RequestSet::Lockfile).
#
# A LockSpecification's dependency information is pre-filled from the
# lockfile.

class Gem::Resolver::LockSpecification < Gem::Resolver::Specification
  attr_reader :sources

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

    @name     = name
    @platform = platform
    @set      = set
    @source   = sources.first
    @sources  = sources
    @version  = version

    @dependencies = []
    @spec         = nil
  end

  ##
  # This is a null install as a locked specification is considered installed.
  # +options+ are ignored.

  def install(options = {})
    destination = options[:install_dir] || Gem.dir

    if File.exist? File.join(destination, "specifications", spec.spec_name)
      yield nil
      return
    end

    super
  end

  ##
  # Adds +dependency+ from the lockfile to this specification

  def add_dependency(dependency) # :nodoc:
    @dependencies << dependency
  end

  def pretty_print(q) # :nodoc:
    q.group 2, "[LockSpecification", "]" do
      q.breakable
      q.text "name: #{@name}"

      q.breakable
      q.text "version: #{@version}"

      unless @platform == Gem::Platform::RUBY
        q.breakable
        q.text "platform: #{@platform}"
      end

      unless @dependencies.empty?
        q.breakable
        q.text "dependencies:"
        q.breakable
        q.pp @dependencies
      end
    end
  end

  ##
  # A specification constructed from the lockfile is returned

  def spec
    @spec ||= Gem::Specification.find do |spec|
      spec.name == @name && spec.version == @version
    end

    @spec ||= Gem::Specification.new do |s|
      s.name     = @name
      s.version  = @version
      s.platform = @platform

      s.dependencies.concat @dependencies
    end
  end
end