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/ruby30/share/ruby/optparse/
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Current File : //opt/alt/ruby30/share/ruby/optparse/ac.rb
# frozen_string_literal: false
require 'optparse'

class OptionParser::AC < OptionParser
  private

  def _check_ac_args(name, block)
    unless /\A\w[-\w]*\z/ =~ name
      raise ArgumentError, name
    end
    unless block
      raise ArgumentError, "no block given", ParseError.filter_backtrace(caller)
    end
  end

  ARG_CONV = proc {|val| val.nil? ? true : val}

  def _ac_arg_enable(prefix, name, help_string, block)
    _check_ac_args(name, block)

    sdesc = []
    ldesc = ["--#{prefix}-#{name}"]
    desc = [help_string]
    q = name.downcase
    ac_block = proc {|val| block.call(ARG_CONV.call(val))}
    enable = Switch::PlacedArgument.new(nil, ARG_CONV, sdesc, ldesc, nil, desc, ac_block)
    disable = Switch::NoArgument.new(nil, proc {false}, sdesc, ldesc, nil, desc, ac_block)
    top.append(enable, [], ["enable-" + q], disable, ['disable-' + q])
    enable
  end

  public

  def ac_arg_enable(name, help_string, &block)
    _ac_arg_enable("enable", name, help_string, block)
  end

  def ac_arg_disable(name, help_string, &block)
    _ac_arg_enable("disable", name, help_string, block)
  end

  def ac_arg_with(name, help_string, &block)
    _check_ac_args(name, block)

    sdesc = []
    ldesc = ["--with-#{name}"]
    desc = [help_string]
    q = name.downcase
    with = Switch::PlacedArgument.new(*search(:atype, String), sdesc, ldesc, nil, desc, block)
    without = Switch::NoArgument.new(nil, proc {}, sdesc, ldesc, nil, desc, block)
    top.append(with, [], ["with-" + q], without, ['without-' + q])
    with
  end
end