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/ruby27/share/rubygems/rubygems/
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Current File : //opt/alt/ruby27/share/rubygems/rubygems/safe_yaml.rb
module Gem

  ###
  # This module is used for safely loading YAML specs from a gem.  The
  # `safe_load` method defined on this module is specifically designed for
  # loading Gem specifications.  For loading other YAML safely, please see
  # Psych.safe_load

  module SafeYAML
    PERMITTED_CLASSES = %w(
      Symbol
      Time
      Date
      Gem::Dependency
      Gem::Platform
      Gem::Requirement
      Gem::Specification
      Gem::Version
      Gem::Version::Requirement
      YAML::Syck::DefaultKey
      Syck::DefaultKey
    ).freeze

    PERMITTED_SYMBOLS = %w(
      development
      runtime
    ).freeze

    if ::YAML.respond_to? :safe_load
      def self.safe_load(input)
        if Gem::Version.new(Psych::VERSION) >= Gem::Version.new('3.1.0.pre1')
          ::YAML.safe_load(input, permitted_classes: PERMITTED_CLASSES, permitted_symbols: PERMITTED_SYMBOLS, aliases: true)
        else
          ::YAML.safe_load(input, PERMITTED_CLASSES, PERMITTED_SYMBOLS, true)
        end
      end

      def self.load(input)
        if Gem::Version.new(Psych::VERSION) >= Gem::Version.new('3.1.0.pre1')
          ::YAML.safe_load(input, permitted_classes: [::Symbol])
        else
          ::YAML.safe_load(input, [::Symbol])
        end
      end
    else
      unless Gem::Deprecate.skip
        warn "YAML safe loading is not available. Please upgrade psych to a version that supports safe loading (>= 2.0)."
      end

      def self.safe_load(input, *args)
        ::YAML.load input
      end

      def self.load(input)
        ::YAML.load input
      end
    end
  end
end