[racket] scribble/lp: comments stripped, how to stop?

I've never gotten into anything but trivial syntax operations. I'd be happy
to dig further if anyone can get me started on stepping though expansions
of included files. Sounds like a good learning opportunity.
 On Apr 22, 2012 3:34 PM, "Matthias Felleisen" <matthias at ccs.neu.edu> wrote:

>
> I haven't used /lp myself. I am stuck here -- Matthias
>
>
>
> On Apr 22, 2012, at 12:25 AM, Deren Dohoda wrote:
>
> > Hi Matthias,
> >
> > I cannot seem to get it to work. I can get scribble to be happy, but
> > not the scribble/lp file.
> >
> > First try: (somewhere in the middle of the file)
> > @(begin
> >   #reader scribble/comment-reader
> >   (chunk <hs-from-xs>
> >          (define hs ; (xi+1) - xi
> >            (map - (rest xs) (drop-right xs 1)))))
> > Second try:
> > @chunk[<hs-from-xs>
> >       #reader scribble/comment-reader
> >       (define hs ; (xi+1) - xi
> >         (map - (rest xs) (drop-right xs 1)))]
> >
> > Both can be scribbled with the comment when included with (lp-include
> > ...), but doesn't run when one runs the file itself. When the file is
> > run, this error appears: "bad syntax (multiple expressions after
> > identifier) in: (define hs (code:comment ..." The only place I can
> > find code:comment defined is in
> > "...Racket/collects/scribble/lp/lang/lang.rkt":
> > (provide code:comment)
> > (define-syntax (code:comment stx)
> >  (if (eq? (syntax-local-context) 'expression)
> >      (syntax (void))
> >      (syntax (define (f x) x))))
> >
> > It looks like it was supposed to strip the comment when being run.
> > "...Racket/collects/scribble/comment-reader.rkt" does have
> >
> > (define (do-comment port recur)
> >    (let loop ()
> >      (when (equal? #\; (peek-char port))
> >        (read-char port)
> >        (loop)))
> >    (when (equal? #\space (peek-char port))
> >      (read-char port))
> >    `(code:comment
> >      (unsyntax ...
> >
> > So it seems like this is where code:comment is coming from, but for
> > some reason the code:comments rule from lang.rkt isn't seeing it.
> >
> > Deren
> >
> > On Sat, Apr 21, 2012 at 9:07 PM, Matthias Felleisen
> > <matthias at ccs.neu.edu> wrote:
> >>
> >> Do you use
> >>
> >> @;%
> >> @(begin
> >> #reader scribble/comment-reader
> >> (racketblock
> >> (place-image ROCKET X ... MTSCN)
> >> ))
> >> @;%
> >>
> >> to write down code blocks? It installs a reader that can cope with
> comments.
> >>
> >>
> >>
> >> On Apr 21, 2012, at 4:53 PM, Deren Dohoda wrote:
> >>
> >>> I have finally started learning scribble for use in literate
> >>> programming to break away from noweb for Racket. It's quite excellent,
> >>> I am glad to be making the switch. Thank everyone for their work. I
> >>> miss the math of latex but it isn't a dealbreaker.
> >>>
> >>> However, part of writing code is commenting the code for reminders of
> >>> why little bits are the way they are. The problem is that the scribble
> >>> HTML output has stripped all comments from the chunks. I have tried
> >>> digging down into scribble/lp but I must admit the guts are outside my
> >>> ability to understand. I'm guessing it is because the reader has
> >>> already stripped comments from the syntax by the time Racket gets to
> >>> the "chunk" syntax rule. The one bit that seems to indicate it strips
> >>> comments (code:comment) never seems to be used anywhere. I know that
> >>> there are code examples with comments in the Racket documentation. Is
> >>> there any way to keep code comments preserved in the scribbled view of
> >>> chunks?
> >>>
> >>> Thanks,
> >>> Deren
> >>> ____________________
> >>>  Racket Users list:
> >>>  http://lists.racket-lang.org/users
> >>
>
>
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