# File lib/mail/parsers/address_lists.rb, line 26
    def _nt_primary_address
      start_index = index
      if node_cache[:primary_address].has_key?(index)
        cached = node_cache[:primary_address][index]
        @index = cached.interval.end if cached
        return cached
      end

      i0 = index
      r1 = _nt_address_list
      r1.extend(PrimaryAddress0)
      if r1
        r0 = r1
      else
        r2 = _nt_obs_addr_list
        r2.extend(PrimaryAddress1)
        if r2
          r0 = r2
        else
          @index = i0
          r0 = nil
        end
      end

      node_cache[:primary_address][start_index] = r0

      r0
    end