# File lib/mail/parsers/rfc2822.rb, line 4409
    def _nt_item_value
      start_index = index
      if node_cache[:item_value].has_key?(index)
        cached = node_cache[:item_value][index]
        if cached
          cached = SyntaxNode.new(input, index...(index + 1)) if cached == true
          @index = cached.interval.end
        end
        return cached
      end

      i0 = index
      s1, i1 = [], index
      loop do
        r2 = _nt_angle_addr
        if r2
          s1 << r2
        else
          break
        end
      end
      if s1.empty?
        @index = i1
        r1 = nil
      else
        r1 = instantiate_node(SyntaxNode,input, i1...index, s1)
      end
      if r1
        r0 = r1
      else
        r3 = _nt_addr_spec
        if r3
          r0 = r3
        else
          r4 = _nt_atom
          if r4
            r0 = r4
          else
            r5 = _nt_domain
            if r5
              r0 = r5
            else
              r6 = _nt_msg_id
              if r6
                r0 = r6
              else
                @index = i0
                r0 = nil
              end
            end
          end
        end
      end

      node_cache[:item_value][start_index] = r0

      r0
    end