I don't see any need for a macro here. Why not use a function that iterates over these 'forms':
(define (expr-iter . form)
(for ((f form))
(case (first f)
...
[(math) (eval (second f) some-useful-namespace)]
...)))
On Jan 7, 2013, at 3:57 PM, Philipp Dikmann wrote:
> Hello Racket-Users,
>
> in trying to iterate a series of expressions and evaluating them differently
> on a case-by-case basis - specifically in the body of a (html-template) -
> Racket is throwing errors indicating that my expressions end up in the wrong
> places. In the code below, it appears that + is being interpreted as an HTML
> element name; am I messing up expansion time and run time?
>
>
> #lang racket
>
> (require (planet neil/html-template:2:2))
>
> (define-syntax-rule (expr-iter form ...)
> (begin
> (case (car 'form)
> [(title) (display (cadr 'form))]
> [(math) (eval (cadr 'form))]
> [(html) (html-template
> (eval (cadr 'form)))]) ...))
>
> (expr-iter (title "sometitle")
> (math (+ 1 2))
> (html (p "hello")))
>
>
> Best regards,
> Philipp
>
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