GIF89a=( õ' 7IAXKgNgYvYx\%wh…hŽth%ˆs%—x¨}9®Œ©€&©‰%¶†(¹–.¹5·œD¹&Çš)ÇŸ5ǘ;Í£*È¡&Õ²)ׯ7×µ<Ñ»4ï°3ø‘HÖ§KͯT÷¨Yÿšqÿ»qÿÔFØ !ù ' !ÿ NETSCAPE2.0 , =( þÀ“pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§gª«ªE¯°¨¬ª±²Œ¹º¹E¾­”´ÂB¶¯ §Åȸ»ÑD¾¿Á•ÄÅ®° ÝH¾ÒLÀÆDÙ«D¶BÝïðÀ¾DÑÑÔTÌÍíH òGö¨A RÎڐ |¥ ٭&ºìE8œ¹kGÔAÞpx­a¶­ã R2XB®åE8I€Õ6Xî:vT)äžþÀq¦è³¥ì仕F~%xñ  4#ZÔ‰O|-4Bs‘X:= QÉ œš lºÒyXJŠGȦ|s hÏíK–3l7·B|¥$'7Jީܪ‰‡àá”Dæn=Pƒ ¤Òëí‰`䌨ljóá¯Éüv>á–Á¼5 ½.69ûϸd«­ºÀûnlv©‹ªîf{¬ÜãPbŸ  l5‘Ž¯pß ´ ˜3aÅùäI«O’ý·‘áÞ‡˜¾Æ‚ÙÏiÇÿ‹Àƒ #öó)pâš Þ½ ‘Ý{ó)vmÞü%D~ 6f s}ŃƒDØW Eþ`‡þ À…L8xá†ç˜{)x`X/> Ì}mø‚–RØ‘*|`D=‚Ø_ ^ð5 !_…'aä“OÚ—7âcð`D”Cx`ÝÂ¥ä‹éY¹—F¼¤¥Š?¡Õ™ n@`} lď’ÄÉ@4>ñd œ à‘vÒxNÃ×™@žd=ˆgsžG±æ ´²æud &p8Qñ)ˆ«lXD©øÜéAžHìySun jª×k*D¤LH] †¦§C™Jä–´Xb~ʪwStŽ6K,°£qÁœ:9ت:¨þªl¨@¡`‚ûÚ ».Û¬¯t‹ÆSÉ[:°=Š‹„‘Nåû”Ìî{¿ÂA ‡Rà›ÀÙ6úë°Ÿð0Ä_ ½;ÃϱîÉì^ÇÛÇ#Ëë¼ôº!±Ä˜íUîÅÇ;0L1óÁµö«p% AÀºU̬ݵ¼á%霼€‡¯Á~`ÏG¯»À× ­²± =4ªnpð3¾¤³¯­ü¾¦îuÙuµÙ®|%2ÊIÿür¦#0·ÔJ``8È@S@5ê¢ ö×Þ^`8EÜ]ý.뜃Âç 7 ú ȉÞj œ½Dç zý¸iþœÑÙûÄë!ˆÞÀl§Ïw‹*DçI€nEX¯¬¼ &A¬Go¼QföõFç°¯;é¦÷îŽêJ°îúôF5¡ÌQ|îúöXªæ»TÁÏyñêï]ê² o óÎC=öõ›ÒÓPB@ D×½œä(>èCÂxŽ`±«Ÿ–JЀ»Û á¤±p+eE0`ëŽ`A Ú/NE€Ø†À9‚@¤à H½7”à‡%B‰`Àl*ƒó‘–‡8 2ñ%¸ —€:Ù1Á‰E¸àux%nP1ð!‘ðC)¾P81lÑɸF#ˆ€{´âé°ÈB„0>±û °b¡Š´±O‚3È–Ù()yRpbµ¨E.Z‘D8ÊH@% òŒx+%Ù˜Æcü »¸˜fõ¬b·d`Fê™8èXH"ÉÈ-±|1Ô6iI, 2““¬$+](A*jÐ QTÂo‰.ÛU슬Œã„Ž`¯SN¡–¶Äåyše¯ª’­¬‚´b¦Éož œ)åyâ@Ì®3 ÎtT̉°&Ø+žLÀf"Ø-|žçÔ>‡Ðv¦Ðžì\‚ Q1)Ž@Žh#aP72”ˆ™¨$‚ !ù " , =( …7IAXG]KgNgYvYxR"k\%w]'}hŽth%ˆg+ˆs%—r.—m3šx3˜x¨}9®€&©€+¨‡7§‰%¶†(¹–.¹œD¹&ǘ;Í•&ײ)×»4ïÌ6ò§KÍ þ@‘pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g «¬ E ±± ¨­¶°ººE Á´”·®C¬²§Ç¶Œ»ÓDÃÕƷ¯Ê±H½ºM×ÁGÚ¬D¶BËÁ½î½DÓôTÏÛßîG»ôõC×CÌ l&âž:'òtU³6ɹ#·Ø)€'Ü.6±&ëÍÈ» K(8p0N?!æ2"ÛˆNIJX>R¼ÐO‚M '¡¨2¸*Ÿþ>#n↠å@‚<[:¡Iïf’ ¤TÚ˘CdbÜÙ“[«ŽEú5MBo¤×@€`@„€Êt W-3 ¶Ÿ¡BíêäjIÝ…Eò9[T…$íêﯧ„…•s»Óȳ¹€ÅÚdc®UUρ#±Ùïldj?´í¼²`\ŽÁðÞu|3'ÖŒ]ë6 ¶S#²‡˜FKLÈ *N E´‘áäŠ$˜›eÄYD„ºq«.è촁ƒs \-ÔjA 9²õ÷å- üúM[Âx(ís÷ì®x€|í¡Ù’p¦‚ ŽkÛTÇDpE@WÜ ²Ç]kŠ1¨ þ€·Yb ÓÁ‰l°*n0 ç™—žzBdОu¾7ĉBl€â‰-ºx~|UåU‰  h*Hœ|e"#"?vpÄiŠe6^ˆ„+qâŠm8 #VÇá ‘å–ÄV„œ|Šè•m"сœn|@›U¶ÆΞ—Špb¥G¨ED”€±Úê2FÌIç? >Éxå Œ± ¡¤„%‘žjŸ‘ꄯ<Ìaà9ijÐ2˜D¦È&›†Z`‚å]wþ¼Â:ç6àB¤7eFJ|õÒ§Õ,¨äàFÇ®cS·Ê¶+B°,‘Þ˜ºNûãØ>PADÌHD¹æž«ÄÀnÌ¥}­#Ë’ë QÀÉSÌÂÇ2ÌXÀ{æk²lQÁ2«ÊðÀ¯w|2Í h‹ÄÂG€,m¾¶ë3ÐÙ6-´ÅE¬L°ÆIij*K½ÀÇqï`DwVÍQXœÚÔpeœ±¬Ñ q˜§Tœ½µƒ°Œìu Â<¶aØ*At¯lmEØ ü ôÛN[P1ÔÛ¦­±$ÜÆ@`ùåDpy¶yXvCAyåB`ŽD¶ 0QwG#¯ æš[^Äþ $ÀÓÝǦ{„L™[±úKÄgÌ;ï£S~¹ìGX.ôgoT.»åˆ°ùŸûù¡?1zö¦Ÿž:ÅgÁ|ìL¹ „®£œŠ‚à0œ]PÁ^p F<"•ç?!,ñ‡N4—…PÄ Á„ö¨Û:Tè@hÀ‹%táÿ:ø-žI<`þ‹p I….)^ 40D#p@ƒj4–؀:²‰1Øâr˜¼F2oW¼#Z†;$Q q” ‘ ÂK¦ñNl#29 !’F@¥Bh·ᏀL!—XFóLH‘Kh¤.«hE&JòG¨¥<™WN!€ÑÙÚˆY„@†>Œž19J" 2,/ &.GXB%ÌRÈ9B6¹W]’î×ÔW¥’IÎ$ ñ‹ÓŒE8YÆ ¼³™ñA5“à®Q.aŸB€&Ø©³ JÁ—! ¦t)K%tœ-¦JF bòNMxLôþ)ÐR¸Ð™‘ èÝ6‘O!THÌ„HÛ ‰ !ù ) , =( …AXKgNgYvYxR"k\%wh…hŽh%ˆg+ˆs%—r.—x3˜x¨}9®€&©€+¨Œ,©‡7§‰%¶†(¹–.¹5·&Çš)ǘ;Í•&×£*Ȳ)ׯ7×»4ï°3øÌ6ò‘HÖ§KÍ»Hó¯T÷¨Yÿ»qÿÇhÿ þÀ”pH,È¤rÉl:ŸÐ¨tJ­Z¯Ø¬vËíz¿à°xL.›Ïè´zÍn»ßð¸|N¯Ûïø¼~Ïïûÿ€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ ¡¢£¤¥¦§g ª« E$±²¨ª­ · °²½$E$ÂÕ««D· Í ¿¦Ç¶¸ÌŒ¾³CÃÅÆ E ééH½MÛÂGâªD­ çBêêϾD²ÒaÀà€Š1r­ðÓ¤ ÔožzU!L˜C'¾yW½UGtäÇïÙllê0×àÂuGþ)AÀs[þ·xì ÁxO%ƒûX2ó—  P£n›R/¡ÑšHše+êDm?# —‘Ç£6¡8íJ¡ŸâDiäªM¥Ö„ôj“¬¹£5oQ7°- <‡ *´lãÓŒ2r/a!l)dÈ A™ÈE¢ôÔ͆…ð ;Ö˜c ¡%ß‚’Ùˆâ¸b½—pe~C"BíëÚHïeF2§æŠ8qb t_`urŠeü wÅu3êæPv§h•"ß`íÍxçLĹÜÖ3á  ~Öº“®›¸ÏMDfJÙ °„ÛµáWõ%§œ‚à©–‚X Ó؁)@®Ñ›Eþ´wëuÅSxb8y\mÖzœ¥§ZbºE—ÂLªÌw!y(>¡™wú=Ç|ÅÝs¢d €CÁW)HÜcC$€L Ä7„r.á\{)@ð` @ äXÈ$PD” `šaG:§æˆOˆ72EÐamn]ù"ŒcÊxÑŒ° &dR8`g«iÙŸLR!¦P …d’ä¡“¦ðÎTƒ¦ià|À _ ¥ Qi#¦Šg›Æ ›noMµ ›V ã£)p ç£ÎW…š=Âeªk§†j„ ´®1ß²sÉxéW«jšl|0¯B0Û, \jÛ´›6±¬¶C ÛíWþï|ëÙ‹¸ñzĸV {ì;Ýñn¼òVˆm³I¼³.Ðã¤PN¥ ²µ¼„µCã+¹ÍByî£Ñ¾HŸ›ëê 7ìYÆFTk¨SaoaY$Dµœìï¿Ã29RÈkt Çïfñ ÇÒ:ÀÐSp¹3ÇI¨â¥DZÄ ü9Ïýögñ½­uÔ*3)O‘˜Ö[_hv ,àî×Et Ÿé¶BH€ Õ[ü±64M@ÔSÌM7dÐl5-ÄÙU܍´©zߌ3Ô€3ž„ „ ¶ÛPô½5×g› êÚ˜kN„Ý…0Îj4€Ìë°“#{þÕ3S2çKÜ'ợlø¼Ú2K{° {Û¶?žm𸧠ËI¼nEò='êüóºè^üæÃ_Û=°óž‚ì#Oý¿Í'¡½áo..ÏYìnüñCœO±Áa¿¢Kô½o,üÄËbö²çºíï{ËC Ú— "”Ï{ËK ÍÒw„õ±Oz dÕ¨à:$ ƒô—«v»] A#ð «€¿šéz)Rx׿ˆ¥‚d``èw-îyÏf×K!ð€þ­Ð|ìPľ„=Ì`ý(f” 'Pa ¥ÐBJa%Ðâf§„%Š¡}FàáÝ×6>ÉäŠG"éŽè=ø!oŠ°^FP¼Ø©Q„ÀCÙÁ`(Ž\ÄÝ® ©Â$<n@dÄ E#ììUÒI! ‚#lù‹`k¦ÐÇ'Rró’ZýNBÈMF Í[¤+‹ðɈ-áwj¨¥þ8¾rá ,VÂh„"|½œ=×G_¦Ñ™EØ 0i*%̲˜Æda0mV‚k¾)›;„&6 p>ÓjK “¦Ç# âDÂ:ûc?:R Ó¬fÞéI-Ì“•Ã<ä=™Ï7˜3œ¨˜c2ŒW ,ˆ”8(T™P‰F¡Jhç"‚ ; 403WebShell
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Current File : /opt/alt/ruby33/share/ruby/psych/visitors/yaml_tree.rb
# frozen_string_literal: true
require_relative '../tree_builder'
require_relative '../scalar_scanner'
require_relative '../class_loader'

module Psych
  module Visitors
    ###
    # YAMLTree builds a YAML ast given a Ruby object.  For example:
    #
    #   builder = Psych::Visitors::YAMLTree.new
    #   builder << { :foo => 'bar' }
    #   builder.tree # => #<Psych::Nodes::Stream .. }
    #
    class YAMLTree < Psych::Visitors::Visitor
      class Registrar # :nodoc:
        def initialize
          @obj_to_id   = {}.compare_by_identity
          @obj_to_node = {}.compare_by_identity
          @targets     = []
          @counter     = 0
        end

        def register target, node
          @targets << target
          @obj_to_node[target] = node
        end

        def key? target
          @obj_to_node.key? target
        rescue NoMethodError
          false
        end

        def id_for target
          @obj_to_id[target] ||= (@counter += 1)
        end

        def node_for target
          @obj_to_node[target]
        end
      end

      attr_reader :started, :finished
      alias :finished? :finished
      alias :started? :started

      def self.create options = {}, emitter = nil
        emitter      ||= TreeBuilder.new
        class_loader = ClassLoader.new
        ss           = ScalarScanner.new class_loader
        new(emitter, ss, options)
      end

      def initialize emitter, ss, options
        super()
        @started    = false
        @finished   = false
        @emitter    = emitter
        @st         = Registrar.new
        @ss         = ss
        @options    = options
        @line_width = options[:line_width]
        if @line_width && @line_width < 0
          if @line_width == -1
            # Treat -1 as unlimited line-width, same as libyaml does.
            @line_width = nil
          else
            fail(ArgumentError, "Invalid line_width #{@line_width}, must be non-negative or -1 for unlimited.")
          end
        end
        @coders     = []

        @dispatch_cache = Hash.new do |h,klass|
          method = "visit_#{(klass.name || '').split('::').join('_')}"

          method = respond_to?(method) ? method : h[klass.superclass]

          raise(TypeError, "Can't dump #{target.class}") unless method

          h[klass] = method
        end.compare_by_identity
      end

      def start encoding = Nodes::Stream::UTF8
        @emitter.start_stream(encoding).tap do
          @started = true
        end
      end

      def finish
        @emitter.end_stream.tap do
          @finished = true
        end
      end

      def tree
        finish unless finished?
        @emitter.root
      end

      def push object
        start unless started?
        version = []
        version = [1,1] if @options[:header]

        case @options[:version]
        when Array
          version = @options[:version]
        when String
          version = @options[:version].split('.').map { |x| x.to_i }
        else
          version = [1,1]
        end if @options.key? :version

        @emitter.start_document version, [], false
        accept object
        @emitter.end_document [email protected]?
      end
      alias :<< :push

      def accept target
        # return any aliases we find
        if @st.key? target
          oid         = @st.id_for target
          node        = @st.node_for target
          anchor      = oid.to_s
          node.anchor = anchor
          return @emitter.alias anchor
        end

        if target.respond_to?(:encode_with)
          dump_coder target
        else
          send(@dispatch_cache[target.class], target)
        end
      end

      def visit_Psych_Omap o
        seq = @emitter.start_sequence(nil, 'tag:yaml.org,2002:omap', false, Nodes::Sequence::BLOCK)
        register(o, seq)

        o.each { |k,v| visit_Hash k => v }
        @emitter.end_sequence
      end

      def visit_Encoding o
        tag = "!ruby/encoding"
        @emitter.scalar o.name, nil, tag, false, false, Nodes::Scalar::ANY
      end

      def visit_Object o
        tag = Psych.dump_tags[o.class]
        unless tag
          klass = o.class == Object ? nil : o.class.name
          tag   = ['!ruby/object', klass].compact.join(':')
        end

        map = @emitter.start_mapping(nil, tag, false, Nodes::Mapping::BLOCK)
        register(o, map)

        dump_ivars o
        @emitter.end_mapping
      end

      alias :visit_Delegator :visit_Object

      def visit_Struct o
        tag = ['!ruby/struct', o.class.name].compact.join(':')

        register o, @emitter.start_mapping(nil, tag, false, Nodes::Mapping::BLOCK)
        o.members.each do |member|
          @emitter.scalar member.to_s, nil, nil, true, false, Nodes::Scalar::ANY
          accept o[member]
        end

        dump_ivars o

        @emitter.end_mapping
      end

      def visit_Exception o
        dump_exception o, o.message.to_s
      end

      def visit_NameError o
        dump_exception o, o.message.to_s
      end

      def visit_Regexp o
        register o, @emitter.scalar(o.inspect, nil, '!ruby/regexp', false, false, Nodes::Scalar::ANY)
      end

      def visit_Date o
        register o, visit_Integer(o.gregorian)
      end

      def visit_DateTime o
        t = o.italy
        formatted = format_time t, t.offset.zero?
        tag = '!ruby/object:DateTime'
        register o, @emitter.scalar(formatted, nil, tag, false, false, Nodes::Scalar::ANY)
      end

      def visit_Time o
        formatted = format_time o
        register o, @emitter.scalar(formatted, nil, nil, true, false, Nodes::Scalar::ANY)
      end

      def visit_Rational o
        register o, @emitter.start_mapping(nil, '!ruby/object:Rational', false, Nodes::Mapping::BLOCK)

        [
          'denominator', o.denominator.to_s,
          'numerator', o.numerator.to_s
        ].each do |m|
          @emitter.scalar m, nil, nil, true, false, Nodes::Scalar::ANY
        end

        @emitter.end_mapping
      end

      def visit_Complex o
        register o, @emitter.start_mapping(nil, '!ruby/object:Complex', false, Nodes::Mapping::BLOCK)

        ['real', o.real.to_s, 'image', o.imag.to_s].each do |m|
          @emitter.scalar m, nil, nil, true, false, Nodes::Scalar::ANY
        end

        @emitter.end_mapping
      end

      def visit_Integer o
        @emitter.scalar o.to_s, nil, nil, true, false, Nodes::Scalar::ANY
      end
      alias :visit_TrueClass :visit_Integer
      alias :visit_FalseClass :visit_Integer

      def visit_Float o
        if o.nan?
          @emitter.scalar '.nan', nil, nil, true, false, Nodes::Scalar::ANY
        elsif o.infinite?
          @emitter.scalar((o.infinite? > 0 ? '.inf' : '-.inf'),
            nil, nil, true, false, Nodes::Scalar::ANY)
        else
          @emitter.scalar o.to_s, nil, nil, true, false, Nodes::Scalar::ANY
        end
      end

      def visit_BigDecimal o
        @emitter.scalar o._dump, nil, '!ruby/object:BigDecimal', false, false, Nodes::Scalar::ANY
      end

      def visit_String o
        plain = true
        quote = true
        style = Nodes::Scalar::PLAIN
        tag   = nil

        if binary?(o)
          o     = [o].pack('m0')
          tag   = '!binary' # FIXME: change to below when syck is removed
          #tag   = 'tag:yaml.org,2002:binary'
          style = Nodes::Scalar::LITERAL
          plain = false
          quote = false
        elsif o =~ /\n(?!\Z)/  # match \n except blank line at the end of string
          style = Nodes::Scalar::LITERAL
        elsif o == '<<'
          style = Nodes::Scalar::SINGLE_QUOTED
          tag   = 'tag:yaml.org,2002:str'
          plain = false
          quote = false
        elsif o == 'y' || o == 'n'
          style = Nodes::Scalar::DOUBLE_QUOTED
        elsif @line_width && o.length > @line_width
          style = Nodes::Scalar::FOLDED
        elsif o =~ /^[^[:word:]][^"]*$/
          style = Nodes::Scalar::DOUBLE_QUOTED
        elsif not String === @ss.tokenize(o) or /\A0[0-7]*[89]/ =~ o
          style = Nodes::Scalar::SINGLE_QUOTED
        end

        is_primitive = o.class == ::String
        ivars = is_primitive ? [] : o.instance_variables

        if ivars.empty?
          unless is_primitive
            tag = "!ruby/string:#{o.class}"
            plain = false
            quote = false
          end
          @emitter.scalar o, nil, tag, plain, quote, style
        else
          maptag = '!ruby/string'.dup
          maptag << ":#{o.class}" unless o.class == ::String

          register o, @emitter.start_mapping(nil, maptag, false, Nodes::Mapping::BLOCK)
          @emitter.scalar 'str', nil, nil, true, false, Nodes::Scalar::ANY
          @emitter.scalar o, nil, tag, plain, quote, style

          dump_ivars o

          @emitter.end_mapping
        end
      end

      def visit_Module o
        raise TypeError, "can't dump anonymous module: #{o}" unless o.name
        register o, @emitter.scalar(o.name, nil, '!ruby/module', false, false, Nodes::Scalar::SINGLE_QUOTED)
      end

      def visit_Class o
        raise TypeError, "can't dump anonymous class: #{o}" unless o.name
        register o, @emitter.scalar(o.name, nil, '!ruby/class', false, false, Nodes::Scalar::SINGLE_QUOTED)
      end

      def visit_Range o
        register o, @emitter.start_mapping(nil, '!ruby/range', false, Nodes::Mapping::BLOCK)
        ['begin', o.begin, 'end', o.end, 'excl', o.exclude_end?].each do |m|
          accept m
        end
        @emitter.end_mapping
      end

      def visit_Hash o
        if o.class == ::Hash
          register(o, @emitter.start_mapping(nil, nil, true, Psych::Nodes::Mapping::BLOCK))
          o.each do |k,v|
            accept k
            accept v
          end
          @emitter.end_mapping
        else
          visit_hash_subclass o
        end
      end

      def visit_Psych_Set o
        register(o, @emitter.start_mapping(nil, '!set', false, Psych::Nodes::Mapping::BLOCK))

        o.each do |k,v|
          accept k
          accept v
        end

        @emitter.end_mapping
      end

      def visit_Array o
        if o.class == ::Array
          visit_Enumerator o
        else
          visit_array_subclass o
        end
      end

      def visit_Enumerator o
        register o, @emitter.start_sequence(nil, nil, true, Nodes::Sequence::BLOCK)
        o.each { |c| accept c }
        @emitter.end_sequence
      end

      def visit_NilClass o
        @emitter.scalar('', nil, 'tag:yaml.org,2002:null', true, false, Nodes::Scalar::ANY)
      end

      def visit_Symbol o
        if o.empty?
          @emitter.scalar "", nil, '!ruby/symbol', false, false, Nodes::Scalar::ANY
        else
          @emitter.scalar ":#{o}", nil, nil, true, false, Nodes::Scalar::ANY
        end
      end

      def visit_BasicObject o
        tag = Psych.dump_tags[o.class]
        tag ||= "!ruby/marshalable:#{o.class.name}"

        map = @emitter.start_mapping(nil, tag, false, Nodes::Mapping::BLOCK)
        register(o, map)

        o.marshal_dump.each(&method(:accept))

        @emitter.end_mapping
      end

      private

      def binary? string
        string.encoding == Encoding::ASCII_8BIT && !string.ascii_only?
      end

      def visit_array_subclass o
        tag = "!ruby/array:#{o.class}"
        ivars = o.instance_variables
        if ivars.empty?
          node = @emitter.start_sequence(nil, tag, false, Nodes::Sequence::BLOCK)
          register o, node
          o.each { |c| accept c }
          @emitter.end_sequence
        else
          node = @emitter.start_mapping(nil, tag, false, Nodes::Sequence::BLOCK)
          register o, node

          # Dump the internal list
          accept 'internal'
          @emitter.start_sequence(nil, nil, true, Nodes::Sequence::BLOCK)
          o.each { |c| accept c }
          @emitter.end_sequence

          # Dump the ivars
          accept 'ivars'
          @emitter.start_mapping(nil, nil, true, Nodes::Sequence::BLOCK)
          ivars.each do |ivar|
            accept ivar
            accept o.instance_variable_get ivar
          end
          @emitter.end_mapping

          @emitter.end_mapping
        end
      end

      def visit_hash_subclass o
        ivars = o.instance_variables
        if ivars.any?
          tag = "!ruby/hash-with-ivars:#{o.class}"
          node = @emitter.start_mapping(nil, tag, false, Psych::Nodes::Mapping::BLOCK)
          register(o, node)

          # Dump the ivars
          accept 'ivars'
          @emitter.start_mapping nil, nil, true, Nodes::Mapping::BLOCK
          o.instance_variables.each do |ivar|
            accept ivar
            accept o.instance_variable_get ivar
          end
          @emitter.end_mapping

          # Dump the elements
          accept 'elements'
          @emitter.start_mapping nil, nil, true, Nodes::Mapping::BLOCK
          o.each do |k,v|
            accept k
            accept v
          end
          @emitter.end_mapping

          @emitter.end_mapping
        else
          tag = "!ruby/hash:#{o.class}"
          node = @emitter.start_mapping(nil, tag, false, Psych::Nodes::Mapping::BLOCK)
          register(o, node)
          o.each do |k,v|
            accept k
            accept v
          end
          @emitter.end_mapping
        end
      end

      def dump_list o
      end

      def dump_exception o, msg
        tag = ['!ruby/exception', o.class.name].join ':'

        @emitter.start_mapping nil, tag, false, Nodes::Mapping::BLOCK

        if msg
          @emitter.scalar 'message', nil, nil, true, false, Nodes::Scalar::ANY
          accept msg
        end

        @emitter.scalar 'backtrace', nil, nil, true, false, Nodes::Scalar::ANY
        accept o.backtrace

        dump_ivars o

        @emitter.end_mapping
      end

      def format_time time, utc = time.utc?
        if utc
          time.strftime("%Y-%m-%d %H:%M:%S.%9N Z")
        else
          time.strftime("%Y-%m-%d %H:%M:%S.%9N %:z")
        end
      end

      def register target, yaml_obj
        @st.register target, yaml_obj
        yaml_obj
      end

      def dump_coder o
        @coders << o
        tag = Psych.dump_tags[o.class]
        unless tag
          klass = o.class == Object ? nil : o.class.name
          tag   = ['!ruby/object', klass].compact.join(':')
        end

        c = Psych::Coder.new(tag)
        o.encode_with(c)
        emit_coder c, o
      end

      def emit_coder c, o
        case c.type
        when :scalar
          @emitter.scalar c.scalar, nil, c.tag, c.tag.nil?, false, c.style
        when :seq
          @emitter.start_sequence nil, c.tag, c.tag.nil?, c.style
          c.seq.each do |thing|
            accept thing
          end
          @emitter.end_sequence
        when :map
          register o, @emitter.start_mapping(nil, c.tag, c.implicit, c.style)
          c.map.each do |k,v|
            accept k
            accept v
          end
          @emitter.end_mapping
        when :object
          accept c.object
        end
      end

      def dump_ivars target
        target.instance_variables.each do |iv|
          @emitter.scalar("#{iv.to_s.sub(/^@/, '')}", nil, nil, true, false, Nodes::Scalar::ANY)
          accept target.instance_variable_get(iv)
        end
      end
    end

    class RestrictedYAMLTree < YAMLTree
      DEFAULT_PERMITTED_CLASSES = {
        TrueClass => true,
        FalseClass => true,
        NilClass => true,
        Integer => true,
        Float => true,
        String => true,
        Array => true,
        Hash => true,
      }.compare_by_identity.freeze

      def initialize emitter, ss, options
        super
        @permitted_classes = DEFAULT_PERMITTED_CLASSES.dup
        Array(options[:permitted_classes]).each do |klass|
          @permitted_classes[klass] = true
        end
        @permitted_symbols = {}.compare_by_identity
        Array(options[:permitted_symbols]).each do |symbol|
          @permitted_symbols[symbol] = true
        end
        @aliases = options.fetch(:aliases, false)
      end

      def accept target
        if !@aliases && @st.key?(target)
          raise BadAlias, "Tried to dump an aliased object"
        end

        unless Symbol === target || @permitted_classes[target.class]
          raise DisallowedClass.new('dump', target.class.name || target.class.inspect)
        end

        super
      end

      def visit_Symbol sym
        unless @permitted_classes[Symbol] || @permitted_symbols[sym]
          raise DisallowedClass.new('dump', "Symbol(#{sym.inspect})")
        end

        super
      end
    end
  end
end

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