From a.rosta@ntlworld.com Mon Aug 27 09:17:26 2001 Return-Path: X-Sender: a.rosta@ntlworld.com X-Apparently-To: lojban@yahoogroups.com Received: (EGP: mail-7_3_2); 27 Aug 2001 16:17:26 -0000 Received: (qmail 82567 invoked from network); 27 Aug 2001 15:58:12 -0000 Received: from unknown (10.1.10.27) by l9.egroups.com with QMQP; 27 Aug 2001 15:58:12 -0000 Received: from unknown (HELO mta07-svc.ntlworld.com) (62.253.162.47) by mta2 with SMTP; 27 Aug 2001 15:58:12 -0000 Received: from andrew ([62.255.42.247]) by mta07-svc.ntlworld.com (InterMail vM.4.01.03.00 201-229-121) with SMTP id <20010827155810.NNHQ710.mta07-svc.ntlworld.com@andrew> for ; Mon, 27 Aug 2001 16:58:10 +0100 To: "Lojban@Yahoogroups. Com" Subject: LALR1 question Date: Mon, 27 Aug 2001 16:57:24 +0100 Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2615.200 From: "And Rosta" I don't think I understand what the difference between 0-tokens lookahead and 1-token lookahead is. Take the notorious example: le broda joi le brode 1 2 3 4 If "1-token lookahead" means that the decision about how to parse word n can be made on the basis of knowing what word n+1 is, then how come it won't work in this case? You get to word 3 & think "selbri linkage or sumti linkage?", so you take a look at word 4, see it's a sumti and so parse word 3 as sumti linkage. What actually happens, apparently, is that when you hit word 3 you're not allowed to see word 4. Can someone explain this to me, please? That is, explain what lookahead is. --And.