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/ruby18/lib64/ruby/1.8/uri/
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#
# = uri/ldap.rb
#
# Author:: 
#  Takaaki Tateishi <ttate@jaist.ac.jp>
#  Akira Yamada <akira@ruby-lang.org>
# License:: 
#   URI::LDAP is copyrighted free software by Takaaki Tateishi and Akira Yamada.
#   You can redistribute it and/or modify it under the same term as Ruby.
# Revision:: $Id: ldap.rb 11708 2007-02-12 23:01:19Z shyouhei $
#

require 'uri/generic'

module URI

  #
  # LDAP URI SCHEMA (described in RFC2255)
  # ldap://<host>/<dn>[?<attrs>[?<scope>[?<filter>[?<extensions>]]]]
  #
  class LDAP < Generic

    DEFAULT_PORT = 389
    
    COMPONENT = [
      :scheme,
      :host, :port,
      :dn,
      :attributes,
      :scope,
      :filter,
      :extensions,
    ].freeze

    SCOPE = [
      SCOPE_ONE = 'one',
      SCOPE_SUB = 'sub',
      SCOPE_BASE = 'base',
    ].freeze

    def self.build(args)
      tmp = Util::make_components_hash(self, args)

      if tmp[:dn]
        tmp[:path] = tmp[:dn]
      end

      query = []
      [:extensions, :filter, :scope, :attributes].collect do |x|
        next if !tmp[x] && query.size == 0
        query.unshift(tmp[x])
      end

      tmp[:query] = query.join('?')

      return super(tmp)
    end

    def initialize(*arg)
      super(*arg)

      if @fragment
        raise InvalidURIError, 'bad LDAP URL'
      end

      parse_dn
      parse_query
    end

    def parse_dn
      @dn = @path[1..-1]
    end
    private :parse_dn

    def parse_query
      @attributes = nil
      @scope      = nil
      @filter     = nil
      @extensions = nil

      if @query
        attrs, scope, filter, extensions = @query.split('?')

        @attributes = attrs if attrs && attrs.size > 0
        @scope      = scope if scope && scope.size > 0
        @filter     = filter if filter && filter.size > 0
        @extensions = extensions if extensions && extensions.size > 0
      end
    end
    private :parse_query

    def build_path_query
      @path = '/' + @dn

      query = []
      [@extensions, @filter, @scope, @attributes].each do |x|
        next if !x && query.size == 0
        query.unshift(x)
      end
      @query = query.join('?')
    end
    private :build_path_query

    def dn
      @dn
    end

    def set_dn(val)
      @dn = val
      build_path_query
      @dn
    end
    protected :set_dn

    def dn=(val)
      set_dn(val)
      val
    end

    def attributes
      @attributes
    end

    def set_attributes(val)
      @attributes = val
      build_path_query
      @attributes
    end
    protected :set_attributes

    def attributes=(val)
      set_attributes(val)
      val
    end

    def scope
      @scope
    end

    def set_scope(val)
      @scope = val
      build_path_query
      @scope
    end
    protected :set_scope

    def scope=(val)
      set_scope(val)
      val
    end

    def filter
      @filter
    end

    def set_filter(val)
      @filter = val
      build_path_query
      @filter
    end
    protected :set_filter

    def filter=(val)
      set_filter(val)
      val
    end

    def extensions
      @extensions
    end

    def set_extensions(val)
      @extensions = val
      build_path_query
      @extensions
    end
    protected :set_extensions

    def extensions=(val)
      set_extensions(val)
      val
    end

    def hierarchical?
      false
    end
  end

  @@schemes['LDAP'] = LDAP
end