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[Chicken-users] Help with srfi 46 and syntax-case

From: Thomas Bushnell BSG
Subject: [Chicken-users] Help with srfi 46 and syntax-case
Date: Fri, 13 Nov 2009 10:58:19 -0800

I have some code which currently uses syntax-case, and because it has
nested macro definitions, it needs the (... ...) hack.  

When we migrate to Chicken 4.0, we'll need to convert that to the
superior srfi 46 choose-your-own-ellipsis method.  What I'd like to do,
to facilitate migrate, is write a version of syntax-rules, for
syntax-case, that accepts the CYOE parameter.

At present, the syntax-case egg defines syntax-rules thus:

(define-syntax syntax-rules
  (lambda (x)
    (syntax-case x ()
      ((_ (k ...) ((keyword . pattern) template) ...)
       (syntax (lambda (x)
                (syntax-case x (k ...)
                  ((dummy . pattern) (syntax template))

I would like to add a clause something like:
 ((_ ellipsis (k ...) ((keyword . pattern) template) ...)
        (lambda (x)
          (with-syntax ((ellipsis (syntax (... ...))))
            (syntax-case x (k ...)
              ((dummy . pattern) (syntax template))

to match the CYOE pattern.  But try as I might, it doesn't work.  good
grief, I do dislike syntax-case.  But in any case, does anyone have any
idea what I should be doing?


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