[antlr-interest] "Comments" token from source to the target language

[Terence Parr]

Hi. Sure.  Each token as an index into token buffer via  
t.getTokenIndex().  Then ask for the token at index -1, -2, etc...   
You can ask for it's channel number too.  Just scan :)

Ter
On Nov 12, 2007, at 4:13 PM, Mateus Baur da Silva wrote:

> Hi Ter,
>
> I understand that parser will ignore the tokens if I set the token  
> to be sent to the parser thru the hidden channel ($channel=HIDDEN;).
>
> By reading your message (and your book), I know I can check the  
> hidden channel for the comments token inside my actions. However, I  
> don't know how to do that. Is there some sample implementing this  
> behavior?
>
> If not, could you (or someone else) let me know how I should  
> implement that inside my actions?
>
> Thanks and Regards,
> Mateus
>
>
> On Nov 12, 2007 8:03 PM, Terence Parr < parrt at cs.usfca.edu> wrote:
>
> On Nov 12, 2007, at 11:38 AM, Mateus Baur da Silva wrote:
>
> > Hi Guys,
> >
> > As I mentioned in some my other email, I doing a translator from a
> > Pascal subset to java. Currently, I'm ignoring the "comments" by
> > using skip() on the lexer rule that defines the "comments".
> >
> > However, I would like to translate the comments from Pascal to Java
> > code as well. I was wondering if I could do that by using the
> > HIDDEN_CHANNEL or some other feature to properly translate the
> > comments. Does someone have any clue on how to do that?
> >
>
> Yep, use the hidden token thing.  Your actions then ask for the
> hidden tokens between real tokens.  Parser ignores them.
>
> Ter
>
>