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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sh-3ll 1.0
DIR:/opt/alt/ruby34/share/ruby/strscan/
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Current File : //opt/alt/ruby34/share/ruby/strscan/strscan.rb
# frozen_string_literal: true

class StringScanner
  # call-seq:
  #   scan_integer(base: 10)
  #
  # If `base` isn't provided or is `10`, then it is equivalent to calling `#scan` with a `[+-]?\d+` pattern,
  # and returns an Integer or nil.
  #
  # If `base` is `16`, then it is equivalent to calling `#scan` with a `[+-]?(0x)?[0-9a-fA-F]+` pattern,
  # and returns an Integer or nil.
  #
  # The scanned string must be encoded with an ASCII compatible encoding, otherwise
  # Encoding::CompatibilityError will be raised.
  def scan_integer(base: 10)
    case base
    when 10
      scan_base10_integer
    when 16
      scan_base16_integer
    else
      raise ArgumentError, "Unsupported integer base: #{base.inspect}, expected 10 or 16"
    end
  end
end