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/ruby/psych/
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Current File : //opt/alt/ruby32/share/ruby/psych/class_loader.rb
# frozen_string_literal: true
require_relative 'omap'
require_relative 'set'

module Psych
  class ClassLoader # :nodoc:
    BIG_DECIMAL = 'BigDecimal'
    COMPLEX     = 'Complex'
    DATE        = 'Date'
    DATE_TIME   = 'DateTime'
    EXCEPTION   = 'Exception'
    OBJECT      = 'Object'
    PSYCH_OMAP  = 'Psych::Omap'
    PSYCH_SET   = 'Psych::Set'
    RANGE       = 'Range'
    RATIONAL    = 'Rational'
    REGEXP      = 'Regexp'
    STRUCT      = 'Struct'
    SYMBOL      = 'Symbol'

    def initialize
      @cache = CACHE.dup
    end

    def load klassname
      return nil if !klassname || klassname.empty?

      find klassname
    end

    def symbolize sym
      symbol
      sym.to_sym
    end

    constants.each do |const|
      konst = const_get const
      class_eval <<~RUBY
        def #{const.to_s.downcase}
          load #{konst.inspect}
        end
      RUBY
    end

    private

    def find klassname
      @cache[klassname] ||= resolve(klassname)
    end

    def resolve klassname
      name    = klassname
      retried = false

      begin
        path2class(name)
      rescue ArgumentError, NameError => ex
        unless retried
          name    = "Struct::#{name}"
          retried = ex
          retry
        end
        raise retried
      end
    end

    CACHE = Hash[constants.map { |const|
      val = const_get const
      begin
        [val, ::Object.const_get(val)]
      rescue
        nil
      end
    }.compact].freeze

    class Restricted < ClassLoader
      def initialize classes, symbols
        @classes = classes
        @symbols = symbols
        super()
      end

      def symbolize sym
        return super if @symbols.empty?

        if @symbols.include? sym
          super
        else
          raise DisallowedClass.new('load', 'Symbol')
        end
      end

      private

      def find klassname
        if @classes.include? klassname
          super
        else
          raise DisallowedClass.new('load', klassname)
        end
      end
    end
  end
end