Re: about OpenToken

["Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de>]

On Sun, 11 Dec 2005 00:54:49 +0100, Lionel Draghi wrote:

> Here is my problem : I am implementing a recursive descent parser, and 
> my grammar contains optionnals keywords, that will be ignored.
> Here is an exemple:
> - do this and this
> - do this and also this
> "also" is an optionnal keyword.
> 
> I am wondering what is the best way to deal with this.
> What comes to my mind is to create a selection (In OpenToken parlance) 
> between the keyword "also" and a null token, child of the abstract 
> "Recognizer.Nothing" token.

If optional keywords cannot appear in any context in any number then this
will not work.

> It seems far to complex to be the right way. Any hints?

Far too simple you mean...

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de