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thread_branch(token) private

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# File lib/net/imap.rb, line 2687
      def thread_branch(token)
        rootmember = nil
        lastmember = nil
        
        while true
          shift_token    # ignore first T_LPAR
          token = lookahead
          
          case token.symbol
          when T_NUMBER
            # new member
            newmember = ThreadMember.new(number, [])
            if rootmember.nil?
              rootmember = newmember
            else    
              lastmember.children << newmember
            end     
            lastmember = newmember
          when T_SPACE 
            # do nothing 
          when T_LPAR
            if rootmember.nil?
              # dummy member
              lastmember = rootmember = ThreadMember.new(nil, [])
            end     
            
            lastmember.children << thread_branch(token)
          when T_RPAR
            break   
          end     
        end
        
        return rootmember
      end
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