Not exactly the 1018, but similar in situation.
I just picked up a LaserJet 1020 on sale for about $100...realizing fully that it may not work. But when I got it for $100, it was worth a try on my iMac Duo Core.
Downloaded the "older" 1022 driver and tried to add the 1020 printer. No driver was available. However, I then plugged the printer to an old G3 iBook and installed the same driver on there. This time the driver popped up immediately and I was able to add the printer. Don't know why but maybe it works with PPC and not Intel.
However, I then shared the iBook via Airport network. Reconnected the printer to the iMac and went back to the Printer Utility. Low and behold...the driver showed up and I could add the 1020 printer.
I realize it's a bit of a workaround. Too bad the LaserJet 1022 isn't available here in Canada (only 1022n which starts at about $300). Otherwise I'd spring for that and not risk future incompatibility.