[antlr-interest] Additional tokens not being passed to Create(IToken token) ?

[Johannes Luber]

Dejas Ninethousand schrieb:
> I see the problem now.  I put a breakpoint in the parser and that
> production was never hit.  The reason is that in my root production
> namespace_decl is preceded by non-terminal filler:
> 
> cs_file    :    filler    namespace_decl LBRACE ((comment)* class_def)*
> RBRACE;
> 
> 
> filler    :    ( options {greedy=false;} : . )*;
> 
> removing filler causes my case statement breakpoint to be hit.  I must
> have misunderstood the nature of "greedy=false".  I interpreted that to
> mean "consume all characters that could not constitute other non
> terminals".  I saw this construct in an example grammar file for block
> comments:
> 
> COMMENT_BLOCK
>     :   '/*' ( options {greedy=false;} : . )* '*/'
> 
> If indeed  my interpretation is wrong, then how does the (.)* regex
> avoid eating the closing */ in a block comment?

Actually, with greedy=true; - the default - the lexer would consume
everything until the last '*/'. greedy=false; says: Stop at the first
'*/'. To solve your little filler problem, you have put some kind of
literal after the *. Or just be more explicit, what constitutes a filler.

Johannes
> 
> -- Matt
> 
> On Tue, Oct 21, 2008 at 3:33 PM, Terence Parr <parrt at cs.usfca.edu
> <mailto:parrt at cs.usfca.edu>> wrote:
> 
> 
>     On Oct 21, 2008, at 1:31 PM, Dejas Ninethousand wrote:
> 
>         I attached the whole parser file last reply, but here is the
>         namespace_decl production:
> 
> 
>     right you have to make it as easy as possible on people so they are
>     willing to help. We are all lazy ;)
> 
>     Anyhoo, your problem seems strange because it clearly calls
> 
> 
>                        adaptor.AddChild(root_0,
>     adaptor.Create(NAMESPACE_COMPLETE, "blort"));
> 
>     create. If you set a breakpoint at it does not get there, the only
>     explanation is that an exception occurs or something else that
>     prevents it from going there.
> 
>     Ter
> 
> 
> 
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