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/ruby26/lib64/ruby/2.6.0/rexml/parsers/xpathparser.rb
# frozen_string_literal: false
require_relative '../namespace'
require_relative '../xmltokens'

module REXML
  module Parsers
    # You don't want to use this class.  Really.  Use XPath, which is a wrapper
    # for this class.  Believe me.  You don't want to poke around in here.
    # There is strange, dark magic at work in this code.  Beware.  Go back!  Go
    # back while you still can!
    class XPathParser
      include XMLTokens
      LITERAL    = /^'([^']*)'|^"([^"]*)"/u

      def namespaces=( namespaces )
        Functions::namespace_context = namespaces
        @namespaces = namespaces
      end

      def parse path
        path = path.dup
        path.gsub!(/([\(\[])\s+/, '\1') # Strip ignorable spaces
        path.gsub!( /\s+([\]\)])/, '\1')
        parsed = []
        OrExpr(path, parsed)
        parsed
      end

      def predicate path
        parsed = []
        Predicate( "[#{path}]", parsed )
        parsed
      end

      def abbreviate( path )
        path = path.kind_of?(String) ? parse( path ) : path
        string = ""
        document = false
        while path.size > 0
          op = path.shift
          case op
          when :node
          when :attribute
            string << "/" if string.size > 0
            string << "@"
          when :child
            string << "/" if string.size > 0
          when :descendant_or_self
            string << "/"
          when :self
            string << "."
          when :parent
            string << ".."
          when :any
            string << "*"
          when :text
            string << "text()"
          when :following, :following_sibling,
                :ancestor, :ancestor_or_self, :descendant,
                :namespace, :preceding, :preceding_sibling
            string << "/" unless string.size == 0
            string << op.to_s.tr("_", "-")
            string << "::"
          when :qname
            prefix = path.shift
            name = path.shift
            string << prefix+":" if prefix.size > 0
            string << name
          when :predicate
            string << '['
            string << predicate_to_string( path.shift ) {|x| abbreviate( x ) }
            string << ']'
          when :document
            document = true
          when :function
            string << path.shift
            string << "( "
            string << predicate_to_string( path.shift[0] ) {|x| abbreviate( x )}
            string << " )"
          when :literal
            string << %Q{ "#{path.shift}" }
          else
            string << "/" unless string.size == 0
            string << "UNKNOWN("
            string << op.inspect
            string << ")"
          end
        end
        string = "/"+string if document
        return string
      end

      def expand( path )
        path = path.kind_of?(String) ? parse( path ) : path
        string = ""
        document = false
        while path.size > 0
          op = path.shift
          case op
          when :node
            string << "node()"
          when :attribute, :child, :following, :following_sibling,
                :ancestor, :ancestor_or_self, :descendant, :descendant_or_self,
                :namespace, :preceding, :preceding_sibling, :self, :parent
            string << "/" unless string.size == 0
            string << op.to_s.tr("_", "-")
            string << "::"
          when :any
            string << "*"
          when :qname
            prefix = path.shift
            name = path.shift
            string << prefix+":" if prefix.size > 0
            string << name
          when :predicate
            string << '['
            string << predicate_to_string( path.shift ) { |x| expand(x) }
            string << ']'
          when :document
            document = true
          else
            string << "/" unless string.size == 0
            string << "UNKNOWN("
            string << op.inspect
            string << ")"
          end
        end
        string = "/"+string if document
        return string
      end

      def predicate_to_string( path, &block )
        string = ""
        case path[0]
        when :and, :or, :mult, :plus, :minus, :neq, :eq, :lt, :gt, :lteq, :gteq, :div, :mod, :union
          op = path.shift
          case op
          when :eq
            op = "="
          when :lt
            op = "<"
          when :gt
            op = ">"
          when :lteq
            op = "<="
          when :gteq
            op = ">="
          when :neq
            op = "!="
          when :union
            op = "|"
          end
          left = predicate_to_string( path.shift, &block )
          right = predicate_to_string( path.shift, &block )
          string << " "
          string << left
          string << " "
          string << op.to_s
          string << " "
          string << right
          string << " "
        when :function
          path.shift
          name = path.shift
          string << name
          string << "( "
          string << predicate_to_string( path.shift, &block )
          string << " )"
        when :literal
          path.shift
          string << " "
          string << path.shift.inspect
          string << " "
        else
          string << " "
          string << yield( path )
          string << " "
        end
        return string.squeeze(" ")
      end

      private
      #LocationPath
      #  | RelativeLocationPath
      #  | '/' RelativeLocationPath?
      #  | '//' RelativeLocationPath
      def LocationPath path, parsed
        path = path.lstrip
        if path[0] == ?/
          parsed << :document
          if path[1] == ?/
            parsed << :descendant_or_self
            parsed << :node
            path = path[2..-1]
          else
            path = path[1..-1]
          end
        end
        return RelativeLocationPath( path, parsed ) if path.size > 0
      end

      #RelativeLocationPath
      #  |                                                    Step
      #    | (AXIS_NAME '::' | '@' | '')                     AxisSpecifier
      #      NodeTest
      #        Predicate
      #    | '.' | '..'                                      AbbreviatedStep
      #  |  RelativeLocationPath '/' Step
      #  | RelativeLocationPath '//' Step
      AXIS = /^(ancestor|ancestor-or-self|attribute|child|descendant|descendant-or-self|following|following-sibling|namespace|parent|preceding|preceding-sibling|self)::/
      def RelativeLocationPath path, parsed
        loop do
          original_path = path
          path = path.lstrip

          return original_path if path.empty?

          # (axis or @ or <child::>) nodetest predicate  >
          # OR                                          >  / Step
          # (. or ..)                                    >
          if path[0] == ?.
            if path[1] == ?.
              parsed << :parent
              parsed << :node
              path = path[2..-1]
            else
              parsed << :self
              parsed << :node
              path = path[1..-1]
            end
          else
            if path[0] == ?@
              parsed << :attribute
              path = path[1..-1]
              # Goto Nodetest
            elsif path =~ AXIS
              parsed << $1.tr('-','_').intern
              path = $'
              # Goto Nodetest
            else
              parsed << :child
            end

            n = []
            path = NodeTest( path, n)

            path = Predicate( path, n )

            parsed.concat(n)
          end

          original_path = path
          path = path.lstrip
          return original_path if path.empty?

          return original_path if path[0] != ?/

          if path[1] == ?/
            parsed << :descendant_or_self
            parsed << :node
            path = path[2..-1]
          else
            path = path[1..-1]
          end
        end
      end

      # Returns a 1-1 map of the nodeset
      # The contents of the resulting array are either:
      #   true/false, if a positive match
      #   String, if a name match
      #NodeTest
      #  | ('*' | NCNAME ':' '*' | QNAME)                NameTest
      #  | '*' ':' NCNAME                                NameTest since XPath 2.0
      #  | NODE_TYPE '(' ')'                             NodeType
      #  | PI '(' LITERAL ')'                            PI
      #    | '[' expr ']'                                Predicate
      PREFIX_WILDCARD = /^\*:(#{NCNAME_STR})/u
      LOCAL_NAME_WILDCARD = /^(#{NCNAME_STR}):\*/u
      QNAME     = Namespace::NAMESPLIT
      NODE_TYPE  = /^(comment|text|node)\(\s*\)/m
      PI        = /^processing-instruction\(/
      def NodeTest path, parsed
        original_path = path
        path = path.lstrip
        case path
        when PREFIX_WILDCARD
          prefix = nil
          name = $1
          path = $'
          parsed << :qname
          parsed << prefix
          parsed << name
        when /^\*/
          path = $'
          parsed << :any
        when NODE_TYPE
          type = $1
          path = $'
          parsed << type.tr('-', '_').intern
        when PI
          path = $'
          literal = nil
          if path !~ /^\s*\)/
            path =~ LITERAL
            literal = $1
            path = $'
            raise ParseException.new("Missing ')' after processing instruction") if path[0] != ?)
            path = path[1..-1]
          end
          parsed << :processing_instruction
          parsed << (literal || '')
        when LOCAL_NAME_WILDCARD
          prefix = $1
          path = $'
          parsed << :namespace
          parsed << prefix
        when QNAME
          prefix = $1
          name = $2
          path = $'
          prefix = "" unless prefix
          parsed << :qname
          parsed << prefix
          parsed << name
        else
          path = original_path
        end
        return path
      end

      # Filters the supplied nodeset on the predicate(s)
      def Predicate path, parsed
        original_path = path
        path = path.lstrip
        return original_path unless path[0] == ?[
        predicates = []
        while path[0] == ?[
          path, expr = get_group(path)
          predicates << expr[1..-2] if expr
        end
        predicates.each{ |pred|
          preds = []
          parsed << :predicate
          parsed << preds
          OrExpr(pred, preds)
        }
        path
      end

      # The following return arrays of true/false, a 1-1 mapping of the
      # supplied nodeset, except for axe(), which returns a filtered
      # nodeset

      #| OrExpr S 'or' S AndExpr
      #| AndExpr
      def OrExpr path, parsed
        n = []
        rest = AndExpr( path, n )
        if rest != path
          while rest =~ /^\s*( or )/
            n = [ :or, n, [] ]
            rest = AndExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace(n)
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| AndExpr S 'and' S EqualityExpr
      #| EqualityExpr
      def AndExpr path, parsed
        n = []
        rest = EqualityExpr( path, n )
        if rest != path
          while rest =~ /^\s*( and )/
            n = [ :and, n, [] ]
            rest = EqualityExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace(n)
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| EqualityExpr ('=' | '!=')  RelationalExpr
      #| RelationalExpr
      def EqualityExpr path, parsed
        n = []
        rest = RelationalExpr( path, n )
        if rest != path
          while rest =~ /^\s*(!?=)\s*/
            if $1[0] == ?!
              n = [ :neq, n, [] ]
            else
              n = [ :eq, n, [] ]
            end
            rest = RelationalExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace(n)
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| RelationalExpr ('<' | '>' | '<=' | '>=') AdditiveExpr
      #| AdditiveExpr
      def RelationalExpr path, parsed
        n = []
        rest = AdditiveExpr( path, n )
        if rest != path
          while rest =~ /^\s*([<>]=?)\s*/
            if $1[0] == ?<
              sym = "lt"
            else
              sym = "gt"
            end
            sym << "eq" if $1[-1] == ?=
            n = [ sym.intern, n, [] ]
            rest = AdditiveExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace(n)
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| AdditiveExpr ('+' | '-') MultiplicativeExpr
      #| MultiplicativeExpr
      def AdditiveExpr path, parsed
        n = []
        rest = MultiplicativeExpr( path, n )
        if rest != path
          while rest =~ /^\s*(\+|-)\s*/
            if $1[0] == ?+
              n = [ :plus, n, [] ]
            else
              n = [ :minus, n, [] ]
            end
            rest = MultiplicativeExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace(n)
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| MultiplicativeExpr ('*' | S ('div' | 'mod') S) UnaryExpr
      #| UnaryExpr
      def MultiplicativeExpr path, parsed
        n = []
        rest = UnaryExpr( path, n )
        if rest != path
          while rest =~ /^\s*(\*| div | mod )\s*/
            if $1[0] == ?*
              n = [ :mult, n, [] ]
            elsif $1.include?( "div" )
              n = [ :div, n, [] ]
            else
              n = [ :mod, n, [] ]
            end
            rest = UnaryExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace(n)
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| '-' UnaryExpr
      #| UnionExpr
      def UnaryExpr path, parsed
        path =~ /^(\-*)/
        path = $'
        if $1 and (($1.size % 2) != 0)
          mult = -1
        else
          mult = 1
        end
        parsed << :neg if mult < 0

        n = []
        path = UnionExpr( path, n )
        parsed.concat( n )
        path
      end

      #| UnionExpr '|' PathExpr
      #| PathExpr
      def UnionExpr path, parsed
        n = []
        rest = PathExpr( path, n )
        if rest != path
          while rest =~ /^\s*(\|)\s*/
            n = [ :union, n, [] ]
            rest = PathExpr( $', n[-1] )
          end
        end
        if parsed.size == 0 and n.size != 0
          parsed.replace( n )
        elsif n.size > 0
          parsed << n
        end
        rest
      end

      #| LocationPath
      #| FilterExpr ('/' | '//') RelativeLocationPath
      def PathExpr path, parsed
        path = path.lstrip
        n = []
        rest = FilterExpr( path, n )
        if rest != path
          if rest and rest[0] == ?/
            rest = RelativeLocationPath(rest, n)
            parsed.concat(n)
            return rest
          end
        end
        rest = LocationPath(rest, n) if rest =~ /\A[\/\.\@\[\w*]/
        parsed.concat(n)
        return rest
      end

      #| FilterExpr Predicate
      #| PrimaryExpr
      def FilterExpr path, parsed
        n = []
        path = PrimaryExpr( path, n )
        path = Predicate(path, n)
        parsed.concat(n)
        path
      end

      #| VARIABLE_REFERENCE
      #| '(' expr ')'
      #| LITERAL
      #| NUMBER
      #| FunctionCall
      VARIABLE_REFERENCE  = /^\$(#{NAME_STR})/u
      NUMBER              = /^(\d*\.?\d+)/
      NT        = /^comment|text|processing-instruction|node$/
      def PrimaryExpr path, parsed
        case path
        when VARIABLE_REFERENCE
          varname = $1
          path = $'
          parsed << :variable
          parsed << varname
          #arry << @variables[ varname ]
        when /^(\w[-\w]*)(?:\()/
          fname = $1
          tmp = $'
          return path if fname =~ NT
          path = tmp
          parsed << :function
          parsed << fname
          path = FunctionCall(path, parsed)
        when NUMBER
          varname = $1.nil? ? $2 : $1
          path = $'
          parsed << :literal
          parsed << (varname.include?('.') ? varname.to_f : varname.to_i)
        when LITERAL
          varname = $1.nil? ? $2 : $1
          path = $'
          parsed << :literal
          parsed << varname
        when /^\(/                                               #/
          path, contents = get_group(path)
          contents = contents[1..-2]
          n = []
          OrExpr( contents, n )
          parsed.concat(n)
        end
        path
      end

      #| FUNCTION_NAME '(' ( expr ( ',' expr )* )? ')'
      def FunctionCall rest, parsed
        path, arguments = parse_args(rest)
        argset = []
        for argument in arguments
          args = []
          OrExpr( argument, args )
          argset << args
        end
        parsed << argset
        path
      end

      # get_group( '[foo]bar' ) -> ['bar', '[foo]']
      def get_group string
        ind = 0
        depth = 0
        st = string[0,1]
        en = (st == "(" ? ")" : "]")
        begin
          case string[ind,1]
          when st
            depth += 1
          when en
            depth -= 1
          end
          ind += 1
        end while depth > 0 and ind < string.length
        return nil unless depth==0
        [string[ind..-1], string[0..ind-1]]
      end

      def parse_args( string )
        arguments = []
        ind = 0
        inquot = false
        inapos = false
        depth = 1
        begin
          case string[ind]
          when ?"
            inquot = !inquot unless inapos
          when ?'
            inapos = !inapos unless inquot
          else
            unless inquot or inapos
              case string[ind]
              when ?(
                depth += 1
                if depth == 1
                  string = string[1..-1]
                  ind -= 1
                end
              when ?)
                depth -= 1
                if depth == 0
                  s = string[0,ind].strip
                  arguments << s unless s == ""
                  string = string[ind+1..-1]
                end
              when ?,
                if depth == 1
                  s = string[0,ind].strip
                  arguments << s unless s == ""
                  string = string[ind+1..-1]
                  ind = -1
                end
              end
            end
          end
          ind += 1
        end while depth > 0 and ind < string.length
        return nil unless depth==0
        [string,arguments]
      end
    end
  end
end

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