[antlr-interest] Re: Error: rule classDef trapped

[Benhur]

I got solution for this error. The solution is - its obvious that I 
can't make a token that is optional as an root node and so the tool 
doesn't accept grammar like #( (START_LABEL label_name END_LABEL)? )

Rgds
Benhur

--- In antlr-interest at y..., "Benhur" <krupa_gadde at y...> wrote:
> Hi all,
> 
> Whenever I compile grammar where MyParser which extends 
TreeParser, 
> I get the following error. Any pointers why is it so? I am also 
> attaching the sub-rule at which this error is occuring.
> 
> -------------------------------------------------------------------
--
> ANTLR Parser Generator   Version 2.7.1   1989-2000 jGuru.com
> error: Token stream error reading grammar
> (s):antlr.TokenStreamRecognitionException: expecting ''', found '{'
> BenhurPLSQL.g: error: rule classDef trapped: BenhurPLSQL.g:229: 
> unexpected token: (
> error: aborting grammar 'BenhurPLSqlParser' due to errors
> TokenStreamException: unexpected char: %
> -------------------------------------------------------------------
--
> 
> Code --- I am getting error at the line	#( (START_LABEL 
label_name 
> END_LABEL)?. I defined START_LABEL and END_LABEL as tokens and 
also 
> defined them in MyLexer
> 
> plsql_block:
> 	#( (START_LABEL label_name END_LABEL)?
> 	(("declare")? (declare_spec)+)? 
> 	("begin")?
>      	seq_of_statements
>      	("exception" exception_handler (exception_handler)*)? 
>      	("end" (label_name)? SEMI!)? )
>         ;
> 
> Thanks
> Benhur


 

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