[antlr-interest] ANTLRWorks, Internal ERROR with my grammar.

[Terence Parr]

Hi, this is a known ANTLR issue where it doesn't give a good message  
when you use ! or ^ and no output=AST option.

Ter
On Jan 21, 2008, at 2:14 PM, Ruslan Zasukhin wrote:

>> On 21/1/08 9:50 PM, "Ruslan Zasukhin" <sunshine at public.kherson.ua>  
>> wrote:
>
> Hi Again,
>
>>> * debugger even do not starts and show dialog about INTERNAL ERROR.
>>>    see attached picture.
>
> I have found reason why debugger fails to start.
>
> For this I have start reduce our grammar as much as possible and  
> have come
> to this:
>
> ----------------------------------
> grammar VSQL_Parser;
>
> sql
>    :    sql_single  EOF!
>    ;
>
> sql_single    : 'create' 'table' IDENT;
>
> IDENT  :   ('a'..'z'|'A'..'Z')+ ;
> INT :   '0'..'9'+ ;
> NEWLINE:'\r'? '\n' ;
> WS  :   (' '|'\t')+ {skip();} ;
> ----------------------------------
>
> And we still get this internal error
> Solution is to remove  !  Near to  EOF!
>
> Its never mind where !  Is located.
>
> For example this also produce this error sometimes. But on the  
> second run it
> seems works fine..
>
>
> ----------------------------------
> grammar VSQL_Parser;
>
> sql
>    :    sql_single  EOF
>    ;
>
> sql_single    : 'create' 'table'! IDENT;
>
> IDENT  :   ('a'..'z'|'A'..'Z')+ ;
> INT :   '0'..'9'+ ;
> NEWLINE:'\r'? '\n' ;
> WS  :   (' '|'\t')+ {skip();} ;
> ----------------------------------
>
>
> Why this happens?  My bug?  ANTRLWorks bug ?
>
>
> -- 
> Best regards,
>
> Ruslan Zasukhin
> VP Engineering and New Technology
> Paradigma Software, Inc
>
> Valentina - Joining Worlds of Information
> http://www.paradigmasoft.com
>
> [I feel the need: the need for speed]
>
>