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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# frozen_string_literal: true
# date.rb: Written by Tadayoshi Funaba 1998-2011

require 'date_core'

class Date
  VERSION = "3.3.3" # :nodoc:

  # call-seq:
  #   infinite? -> false
  #
  # Returns +false+
  def infinite?
    false
  end

  class Infinity < Numeric # :nodoc:

    def initialize(d=1) @d = d <=> 0 end

    def d() @d end

    protected :d

    def zero?() false end
    def finite?() false end
    def infinite?() d.nonzero? end
    def nan?() d.zero? end

    def abs() self.class.new end

    def -@() self.class.new(-d) end
    def +@() self.class.new(+d) end

    def <=>(other)
      case other
      when Infinity; return d <=> other.d
      when Float::INFINITY; return d <=> 1
      when -Float::INFINITY; return d <=> -1
      when Numeric; return d
      else
        begin
          l, r = other.coerce(self)
          return l <=> r
        rescue NoMethodError
        end
      end
      nil
    end

    def coerce(other)
      case other
      when Numeric; return -d, d
      else
        super
      end
    end

    def to_f
      return 0 if @d == 0
      if @d > 0
        Float::INFINITY
      else
        -Float::INFINITY
      end
    end

  end

end