Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.compilers > #1352
| Path | csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!usenet.blueworldhosting.com!feeder01.blueworldhosting.com!border2.nntp.dca1.giganews.com!nntp.giganews.com!news.iecc.com!.POSTED!nerds-end |
|---|---|
| From | Chris Dodd <cdodd@acm.org> |
| Newsgroups | comp.compilers |
| Subject | Re: LR(1) Parsing : Error Handling & Recovery |
| Date | Sat, 26 Jul 2014 21:16:19 +0000 (UTC) |
| Organization | A noiseless patient Spider |
| Lines | 20 |
| Sender | news@iecc.com |
| Approved | comp.compilers@iecc.com |
| Message-ID | <14-07-062@comp.compilers> (permalink) |
| References | <14-07-023@comp.compilers> <14-07-024@comp.compilers> <14-07-030@comp.compilers> <14-07-031@comp.compilers> <14-07-041@comp.compilers> <14-07-046@comp.compilers> <14-07-060@comp.compilers> |
| NNTP-Posting-Host | news.iecc.com |
| X-Trace | miucha.iecc.com 1406414806 3054 2001:470:1f07:1126:0:676f:7373:6970 (26 Jul 2014 22:46:46 GMT) |
| X-Complaints-To | abuse@iecc.com |
| NNTP-Posting-Date | Sat, 26 Jul 2014 22:46:46 +0000 (UTC) |
| Keywords | LL(1), parse |
| Posted-Date | 26 Jul 2014 18:46:46 EDT |
| X-submission-address | compilers@iecc.com |
| X-moderator-address | compilers-request@iecc.com |
| X-FAQ-and-archives | http://compilers.iecc.com |
| Xref | csiph.com comp.compilers:1352 |
Show key headers only | View raw
George Neuner <gneuner2@comcast.net> wrote
> For every LL(k) grammar where both k and the set T of tokens is fixed,
> there is an equivalent LL(1) grammar. In the worst case, the
> equivalent LL(1) grammar will have k**T rules.
This is simply not true. A counter-example from Kurki-Suonio
<ftp://ftp.math.utah.edu/pub/tex/bib/idx/bit/9/3/225-238.html>
<http://www.springerlink.com/openurl.asp?genre=article&issn=0006-
3835&volume=9&issue=3&spage=225>
is:
S ::= aSA | \epsilon
A ::= aabS | c
This grammar (and the language) is LL(2), but there does not exist an
equivalent LL(1) grammar. Here k=2 (fixed) and T = {a, b, c} (also fixed)
Chris Dodd
cdodd@acm.org
Back to comp.compilers | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
LR(1) Parsing : Error Handling & Recovery Seima Rao <seimarao@gmail.com> - 2014-07-10 05:30 +0530
Re: LR(1) Parsing : Error Handling & Recovery Ivan Godard <ivan@ootbcomp.com> - 2014-07-16 16:39 -0400
Re: LR(1) Parsing : Error Handling & Recovery Evangelos Drikos <drikosev@otenet.gr> - 2014-07-17 20:15 +0300
Re: LR(1) Parsing : Error Handling & Recovery Ivan Godard <ivan@ootbcomp.com> - 2014-07-17 13:03 -0700
Re: LR(1) Parsing : Error Handling & Recovery Ivan Godard <ivan@ootbcomp.com> - 2014-07-17 13:57 -0700
Re: LR(1) Parsing : Error Handling & Recovery wclodius@earthlink.net (William Clodius) - 2014-07-18 13:41 -0600
Re: LR(1) Parsing : Error Handling & Recovery Stefan Monnier <monnier@iro.umontreal.ca> - 2014-07-18 21:09 -0400
Re: LR(1) Parsing : Error Handling & Recovery Hans-Peter Diettrich <DrDiettrich1@aol.com> - 2014-07-19 12:04 +0200
Re: LR(1) Parsing : Error Handling & Recovery Stefan Monnier <monnier@iro.umontreal.ca> - 2014-07-20 10:28 -0400
Re: LR(1) Parsing : Error Handling & Recovery Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2014-07-21 10:46 +0200
Re: LR(1) Parsing : Error Handling & Recovery Stefan Monnier <monnier@iro.umontreal.ca> - 2014-08-06 21:32 -0400
Re: LR(1) Parsing : Error Handling & Recovery arnold@skeeve.com (Aharon Robbins) - 2014-07-20 06:05 +0000
Re: LR(1) Parsing : Error Handling & Recovery George Neuner <gneuner2@comcast.net> - 2014-07-17 18:49 -0400
Re: LR(1) Parsing : Error Handling & Recovery wclodius@earthlink.net (William Clodius) - 2014-07-18 13:41 -0600
Re: LR(1) Parsing : Error Handling & Recovery Hans Aberg <haberg-news@telia.com> - 2014-07-19 15:29 +0200
Re: LR(1) Parsing : Error Handling & Recovery Evangelos Drikos <drikosev@otenet.gr> - 2014-07-20 00:40 +0300
Re: LR(1) Parsing : Error Handling & Recovery Hans Aberg <haberg-news@telia.com> - 2014-07-20 01:38 +0200
Re: LR(1) Parsing : Error Handling & Recovery Evangelos Drikos <drikosev@otenet.gr> - 2014-07-21 15:20 +0300
Re: LR(1) Parsing : Error Handling & Recovery Hans Aberg <haberg-news@telia.com> - 2014-07-21 18:39 +0200
Re: LR(1) Parsing : Error Handling & Recovery Evangelos Drikos <drikosev@otenet.gr> - 2014-08-26 13:44 +0300
Re: LR(1) Parsing : Error Handling & Recovery Hans Aberg <haberg-news@telia.com> - 2014-08-29 11:13 +0200
Re: split tokens; was LR(1) Parsing : Error Handling & Recovery Evangelos Drikos <drikosev@otenet.gr> - 2014-09-03 16:57 +0300
Re: LR(1) Parsing : Error Handling & Recovery Hans Aberg <haberg-news@telia.com> - 2014-09-03 19:07 +0200
Re: LR(1) Parsing : Error Handling & Recovery George Neuner <gneuner2@comcast.net> - 2014-07-20 01:19 -0400
Re: LR(1) Parsing : Error Handling & Recovery wclodius@earthlink.net (William Clodius) - 2014-07-20 21:43 -0600
Re: LR(1) Parsing : Error Handling & Recovery wclodius@earthlink.net (William Clodius) - 2014-07-21 21:44 -0600
Re: LR(1) Parsing : Error Handling & Recovery Chris Dodd <cdodd@acm.org> - 2014-07-21 06:07 +0000
Re: LR(1) Parsing : Error Handling & Recovery George Neuner <gneuner2@comcast.net> - 2014-07-25 21:58 -0400
Re: LR(1) Parsing : Error Handling & Recovery Chris Dodd <cdodd@acm.org> - 2014-07-26 21:16 +0000
Re: LR(1) Parsing : Error Handling & Recovery Hans-Peter Diettrich <DrDiettrich1@netscape.net> - 2014-07-28 14:43 +0200
Re: LR(1) Parsing : Error Handling & Recovery Chris Dodd <cdodd@acm.org> - 2014-07-29 19:38 +0000
Re: LR(1) Parsing : Error Handling & Recovery Eric <news@fx29.iad.highwinds-media.com> - 2014-07-16 16:40 -0400
csiph-web