[antlr-interest] help understanding the parsing error
jimi at temporal-wave.com
Fri May 11 12:17:31 PDT 2012
Try taking out the backtrack, k, and memorize options. You should not use
backtrack unless you have no choice and you are usually better letting
ANTLR deal with k. Have you followed the getting started articles in the
> -----Original Message-----
> From: Mikhail Kruk [mailto:meshko at gmail.com]
> Sent: Friday, May 11, 2012 11:57 AM
> To: Jim Idle
> Cc: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] help understanding the parsing error
> I tried it and it doesn't seem to make a difference.
> On Fri, May 11, 2012 at 2:28 PM, Jim Idle <jimi at temporal-wave.com>
> > Do not use 'XYZ'. Create a token in the lexer:
> > XYZ : 'XYZ' ;
> > And declare it before your ID rule. Do this for all the literals in
> > your parser grammar.
> > Jim
> >> -----Original Message-----
> >> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> >> bounces at antlr.org] On Behalf Of Mikhail Kruk
> >> Sent: Friday, May 11, 2012 8:30 AM
> >> To: antlr-interest at antlr.org
> >> Subject: [antlr-interest] help understanding the parsing error
> >> I have a very simple grammar (attached, but here's the relevant
> >> start
> >> : (simple_expression | dotted_identifier)*
> >> ;
> >> simple_expression
> >> : 'XYZ' 'HAHA'
> >> ;
> >> identifier
> >> : ID
> >> ;
> >> dotted_identifier
> >> : identifier ( DOT identifier )*
> >> ;
> >> It pretty much works as expected, accepting "XYZ HAHA", "BLAH.TEST"
> >> and "ABC". But when I try to parse "XYZ.A" or "A.XYZ" it gets
> >> confused trying to apply simple_expression to 'XYZ'. I don't
> >> understand why this is happening. Shouldn't backtracking tear right
> through this?
> >> Thanks!
> >> -m
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