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Re: PEG Parser Updates/Questions

From: Michael Lucy
Subject: Re: PEG Parser Updates/Questions
Date: Fri, 6 Aug 2010 01:40:13 -0500

On Wed, Jul 28, 2010 at 12:13 AM, Michael Lucy <address@hidden> wrote:
> I've officially eliminated the last define-macro expression.
> However, I get the feeling that things may not be exactly as desired.
> The original program made extensive use of functions in building the
> macros, and I originally tried to replace these with macros.  This
> turned out to be a little difficult to debug, however (read: I was
> unable to make the code actually work).  I eventually abandoned this
> and just made datum->syntax calls.

I've left this alone since then; it would be nice to get some
confirmation that this was the right choice though.  If it isn't, I
think I still have time to change it before the GSOC deadline (and
like I said, I'll hang around after it).

Anyway, I just pushed up everything I have to the git repository (I
think; I may have screwed up the syntax).  I'm basically done except
that the documentation/comments could use some more touching up, I
don't have a set of benchmarks yet and I haven't really optimized
things all that much.

> On the one hand, this works.  I also find it easier to debug, and I
> think it looks cleaner.
> The downside is that one doesn't get all the same benefits of
> referential transparency, so I still have gensyms in the functions
> etc.  Is this a problem?
> If so, I can definitely replace everything with macros, but I might
> not be able to do that and get everything else done by the GSOC
> project deadline.  I'd like to hang around after the project is
> officially done from Google's point of view to polish things up, so I
> could also do it then.
> Another question about module namespaces:  I have some syntax that I'd
> like to be available to code generated by macros in my module, but
> which I'd rather not export to the user (to avoid clobbering their
> functions).  Is there a standard way of doing this?  I can't seem to
> find anything in the module documentation regarding giving namespaces
> to things in modules except for :renamer, which has to be done by the
> user--the only options appear to be not exporting it at all, or
> exporting it straight into the user's namespace.  The best fix I can
> think of is naming the syntax things the user is unlikely to ever take
> (or maybe using gensyms to make sure it isn't a name they take).

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