Re: [Grammatica-users] Empty file parsing

[Yakov Keselman]

Perhaps, for this specific case (parsing a file with
some comments only, not an empty file), it would be
easier not to ignore them (remove the %ignore% tag)?
Since comments will never propagate up the tree, the
overhead is likely to be minimal.

= Yakov


--- Per Cederberg <address@hidden> wrote:

> I assume that the comment tokens are marked with
> %ignore%.
> In that case it is not possible to do it with
> Grammatica,
> as all productions must match at least 1 token.
> 
> You could do some kind of work-around, though, by
> ignoring
> parse errors on some occations. Perhaps the easiest
> way
> would be to subclass the Tokenizer to set a flag if
> it
> returns a token. In case of parse error, you can
> then check
> the flag to see if the cause was lack of input. Care
> must
> be taken to handle tokenizer exceptions properly
> though.
> 
> I know this isn't an ideal solution. So I've
> registered a
> feature request on the issue:
> 
>
https://savannah.nongnu.org/bugs/index.php?func=detailitem&item_id=16783
> 
> Cheers,
> 
> /Per
> 
> Leszek Doniec wrote:
> > Hello,
> >  
> > is there any possibility to parse a file that
> includes only comments? 
> > I use grammatica 1.4.
> >  
> > Thanks for help,
> > Leszek Doniec
> > 
> > 
> >
>
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http://www.kinderspirit.org/yakovkeselman/

====

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