[antlr-interest] Question

[Jim Idle]

When you debug are you selecting the start rule 'term' - I bet you are starting with atom. If interpretting, probaly th same things!

Jim


> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Bill Andersen
> Sent: Tuesday, April 29, 2008 9:21 AM
> To: antlr-interest at antlr.org
> Subject: [antlr-interest] Question
> 
> Folks,
> 
> I have a grammar (relevant snippet below) with which I'm having a
> parsing problem.  (I'm using ANTLR 3.1 in a beta release of ANTLRWorks
> FWIW)
> 
> term
> 	: NAME
> 	| LP term+ RP
> 	;
> 
> atom
> 	: LP term+ RP
> 	;
> 
> LP
> 	: '('
> 	;
> 
> RP
> 	: ')'
> 	;
> 
> NAME
> 	: ('a'..'z')+
> 	;
> 
> WS
> 	:  (' '|'\t'|'\n'|'\r') {$channel=HIDDEN;}
>    ;
> 
> Attempts to parse "( foo )" in ANTLRWorks' interpreter as a 'term'
> fails. while parsing "( ( foo ) )" as an 'atom' succeeds (i.e. I'm
> seeing the correct parse trees).  Note that the former 'term' is
> embedded in the latter 'atom'.  Am I making an obvious mistake?  Any
> help appreciated.
> 
> 	.bill