Hi Kevin,
When you are writing macro generating macros there are two levels of
ellipsis.
The outer one, which you can write as ... as normal and the inner one which
you need to escape.
You can escape it with (... ...). That looks odd to me, so I usually bind
it to an identifier named ooo.
#lang racket
(require (for-syntax syntax/parse
racket/syntax))
(define-syntax (make-id-macro stx)
(syntax-parse stx
[(_ id)
(with-syntax ([name (format-id #'id "do-~a" #'id)]
[ooo #'(... ...)])
#'(define-syntax (name stx)
(syntax-parse stx
[(_ parms ooo)
#'(list parms ooo)])))]))
(make-id-macro foo)
(do-foo 1 2)
See you on Racket Discourse.
/Jens Axel
Den ons. 24. maj 2023 kl. 06.27 skrev Kevin Forchione <lyss...@gmail.com>:
> Hi guys,
> I’m stumped. In a nutshell I want to write a macro that is passed an id
> and will produce a macro called id that can take variable arguments. I’m
> sure I’m overlooking something fundamental. The basic form below “works” if
> I don’t have ellipsis aver the variables, but that’s not what I’m after.
> Here’s an example that is obviously wrong, but is along the lines of what
> I’m looking for:
>
> #lang racket
>
>
> (require (for-syntax syntax/parse
> racket/syntax))
>
> (define-syntax (make-id-macro stx)
> (syntax-parse stx
> [(_ id)
> (with-syntax ([name (format-id #'id "do-~a" #'id)])
> #'(define-syntax (name stx)
> (syntax-parse stx
> [(_ parms ...)
> #'( list parms ...)])))]))
>
> Any help in this and explaining why it fails would be greatly appreciated.
>
> -Kevin
>
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Jens Axel Søgaard
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