Re: Nyacc: how to lex comments?

[Matt Wette]

On 3/17/20 12:46 AM, address@hidden wrote:
> On Mon, Mar 16, 2020 at 05:11:59PM -0700, Matt Wette wrote:
> > On 3/16/20 2:39 PM, address@hidden wrote:
> > > Hi,
> > >
> > > in my quest to play parsing, I'm failing when I try to cope with
> > > comments.
> [...]
>
> > make-comm-reader will not eat newlines at end of comment by default.
> > If you want the comment # ... \n to include the newline try adding
> > #:eat-newline #t.
> D'oh, thanks. Also, I noticed I've to set #:comm-skipper in 'gen-lexer',
> instead of #:comm-reader.
>
> I didn't quite understand the difference between both. Would I have
> to include comments explicitly in the grammar if the lexer uses
> #:comment-reader?
>
> Thanks again
> -- tomás
Yes.  Use comm-reader if your grammar accepts comments.
Use comm-skipper if your grammar does not.

The ffi-helper does read comments in the C grammar and
dumps them in the output files, for example.