Oh. I checked that that the expressions were accumulating in the definition of
extract-expression, but I didn't check that it expanded in the right order to
do what you want.
So this doesn't actually work.
On Jul 21, 2015, at 3:08 PM, Alexander D. Knauth <alexan...@knauth.org> wrote:
> Here's a macro that does something similar:
>
> #lang at-exp racket
>
> (require (for-syntax syntax/parse
> racket/contract
> ))
>
> (begin-for-syntax
> (define (get-extracted-exprs-box extracted-exprs-id)
> (syntax-local-value extracted-exprs-id))
> (define (get-extracted-exprs extracted-exprs-id)
> (unbox (get-extracted-exprs-box extracted-exprs-id)))
> (define (box-update! b f)
> (set-box! b (f (unbox b))))
> (define (add-extracted-expr! extracted-exprs-id new-expr)
> (box-update! (get-extracted-exprs-box extracted-exprs-id)
> (λ (lst) (append lst (list (syntax-local-introduce
> new-expr)))))))
>
> (define-syntax extract-expression
> (syntax-parser
> [(extract-expression expr:expr extracted-exprs-id:id)
> (add-extracted-expr! #'extracted-exprs-id #'expr)
> #'expr]))
>
> (define-syntax with-extract-expressions
> (syntax-parser
> [(with-extract-expressions stx-expr:expr ...)
> #:with [extracted-exprs macro-id:id ...]
> (generate-temporaries #'[extracted-expressions stx-expr ...])
> #'(begin
> (define-syntax extracted-exprs (box '()))
> (begin
> (define-syntax macro-id
> (lambda (stx)
> (stx-expr #'extracted-exprs)))
> (macro-id))
> ...)]))
>
> (define (square x) (* x x))
>
> (with-extract-expressions
> (lambda (exprs)
> (with-syntax ([exprs exprs])
> #'(module+ test
> (require rackunit)
> (check-equal? (extract-expression (square 5) exprs) 25)
> (check-equal? (extract-expression (square -5) exprs) 25))))
> (lambda (exprs)
> (with-syntax ([(expr ...) (get-extracted-exprs exprs)])
> #'(module+ doc
> (require scribble/manual
> scribble/eval)
> (define evaluator (make-base-eval))
> @defproc[(square [x real?]) real?]{
> Returns the square of @racket[x], the result of
> multiplying @racket[x] by itself.
> @examples[#:eval evaluator expr ...]}))))
>
>
> On Jul 20, 2015, at 8:03 PM, Jack Firth <jackhfi...@gmail.com> wrote:
>
>> I'm trying to create a way to automatically turn test cases into examples.
>> I'd like a macro that turns this:
>>
>> (extract-expressions
>> (module+ test
>> (check-equal? (extract-expression (square 5)) 25)
>> (check-equal? (extract-expression (square -5)) 25))
>> (module+ doc
>> @defproc[(square [x real?]) real?]{
>> Returns the square of @racket[x], the result of
>> multiplying @racket[x] by itself.
>> @examples[#:eval evaluator (include-extracted-expressions)]}))
>>
>> into this:
>>
>> (begin
>> (module+ test
>> (check-equal? (square 5) 25))
>> (module+ doc
>> @defproc[(square [x real?]) real?]{
>> Returns the square of @racket[x], the result of
>> multiplying @racket[x] by itself.
>> @examples[#:eval evaluator (square 5) (square -5)]}))
>>
>> That's the general idea anyway. I want to be able to gather arbitrary
>> expressions inside a region and "copy" them into some other marked place
>> inside the expressions. How exactly do I go about doing this, and how should
>> I do it "properly"?
>>
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