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

#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++

require_relative "../rubygems"

##
# Mixin methods for --version and --platform Gem::Command options.

module Gem::VersionOption

  ##
  # Add the --platform option to the option parser.

  def add_platform_option(task = command, *wrap)
    Gem::OptionParser.accept Gem::Platform do |value|
      if value == Gem::Platform::RUBY
        value
      else
        Gem::Platform.new value
      end
    end

    add_option("--platform PLATFORM", Gem::Platform,
               "Specify the platform of gem to #{task}", *wrap) do
                 |value, options|
      unless options[:added_platform]
        Gem.platforms = [Gem::Platform::RUBY]
        options[:added_platform] = true
      end

      Gem.platforms << value unless Gem.platforms.include? value
    end
  end

  ##
  # Add the --prerelease option to the option parser.

  def add_prerelease_option(*wrap)
    add_option("--[no-]prerelease",
               "Allow prerelease versions of a gem", *wrap) do |value, options|
      options[:prerelease] = value
      options[:explicit_prerelease] = true
    end
  end

  ##
  # Add the --version option to the option parser.

  def add_version_option(task = command, *wrap)
    Gem::OptionParser.accept Gem::Requirement do |value|
      Gem::Requirement.new(*value.split(/\s*,\s*/))
    end

    add_option("-v", "--version VERSION", Gem::Requirement,
               "Specify version of gem to #{task}", *wrap) do
                 |value, options|
      # Allow handling for multiple --version operators
      if options[:version] && !options[:version].none?
        options[:version].concat([value])
      else
        options[:version] = value
      end

      explicit_prerelease_set = !options[:explicit_prerelease].nil?
      options[:explicit_prerelease] = false unless explicit_prerelease_set

      options[:prerelease] = value.prerelease? unless
        options[:explicit_prerelease]
    end
  end

  ##
  # Extract platform given on the command line

  def get_platform_from_requirements(requirements)
    Gem.platforms[1].to_s if requirements.key? :added_platform
  end
end