Re: [racket-users] Chez Scheme history

[wanderley.guimar...@gmail.com]

Thanks for sharing this.

On Thu, May 23, 2019 at 10:09 AM Josh Rubin  wrote:

> I am just starting to learn Racket. Thank you, all Racket developers.
> I read about the concept of using the Chez Scheme runtime system to
> "host" Racket, so I looked into Chez, and found an interesting paper.
>
> The Development of Chez Scheme by R. Kent Dybvig
> https://www.cs.indiana.edu/%7Edyb/pubs/hocs.pdf
>
> I like its discussion of Scheme implementation issues. I also enjoyed
> reading about the author's evolution as a designer.
>
>
> --
> Josh Rubin
> jlru...@gmail.com
>
>
> --
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> .
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>
-- 
Abraço,
Wanderley Guimarães

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Re: [racket-users] Macro help

[Michael Murdock MacLeod]

Does this work? It uses a helper function, `prune`, to parse the var-val 
clauses.

#lang racket

(define-for-syntax (prune stx)
  (syntax-case stx ()
[()
 #'()]
[((var val) others ...)
 (cons #'(var val)
   (prune #'(others ...)))]
[(var others ...)
 (cons #'(var #f)
   (prune #'(others ...)))]))

(define-syntax (aux stx)
  (syntax-case stx ()
[(_ terms ...)
 (with-syntax ([((var val) ...) (prune #'(terms ...))])
   #'(define-values (var ...) (values val ...)))]))

(aux a (b (* 2 pi)) c (d pi))
a
b
c
d

;; output shown below

#f
6.283185307179586
#f
3.141592653589793

On Thursday, May 23, 2019 9:41:17 PM PDT Kevin Forchione wrote:
> Hi guys,
> I’ve been wracking my brains all day trying to come up with a macro that
> would convert this syntax:
> 
> ;; (aux a (b (* 2 pi)) c (d pi))
> ;; => (define-values (a b c d) (values #f 6.28318530717958 #f
> 3.141592653589793)
> 
> 
> I’m missing some part of the picture. The closest I’ve come is to create a
> list of the pairs:
> 
> #lang racket
> 
> (define-syntax (aux stx)
>   (syntax-case stx ()
> [(_ (var val)) #'`((var ,val))]
> [(_ var) #''((var #f))]
> [(_ (var0 val0) var1 ...) #'(append `((var0 ,val0)) (aux var1 ...))]
> [(_ var0 var1 ...) #'(append '((var0 #f)) (aux var1 ...))]))
> 
> (aux a (b (* 2 pi)) c (d pi)) ;=> '((a #f) (b 6.283185307179586) (c #f) (d
> 3.141592653589793))
> 
> 
> Any help is greatly appreciated!
> 
> Kevin


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[racket-users] Macro help

[Kevin Forchione]

Hi guys,
I’ve been wracking my brains all day trying to come up with a macro that would 
convert this syntax:

;; (aux a (b (* 2 pi)) c (d pi))
;; => (define-values (a b c d) (values #f 6.28318530717958 #f 3.141592653589793)


I’m missing some part of the picture. The closest I’ve come is to create a list 
of the pairs:

#lang racket

(define-syntax (aux stx)
  (syntax-case stx ()
[(_ (var val)) #'`((var ,val))]
[(_ var) #''((var #f))]
[(_ (var0 val0) var1 ...) #'(append `((var0 ,val0)) (aux var1 ...))]
[(_ var0 var1 ...) #'(append '((var0 #f)) (aux var1 ...))]))

(aux a (b (* 2 pi)) c (d pi)) ;=> '((a #f) (b 6.283185307179586) (c #f) (d 
3.141592653589793))


Any help is greatly appreciated!

Kevin

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[racket-users] Racket Mode documentation

[Greg Hendershott]

Recently I consolidated and updated Racket Mode documentation.

It is generated in two formats:

- Info: Installed locally. View in Emacs with `C-h i`.

- HTML: View at .


If you're curious how it's prepared:
.

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[racket-users] Re: Chez Scheme history

[francesco bennardo]

Hi Josh, do as done myself: learn both, Chez Scheme and Racket, you will 
not regret it.
For Chez Scheme there is the book of Dybvig online, along with other 
documentation, and for racket I suggest you "Realm of Racket".
One thing want to tell you: with chez scheme I calculate with recursion 
1,000,000! (one million factorial).
Try this with chez scheme:

(define fact
  (lambda (n)
(cond ((= n 0) 1)
  (else (* n (fact (- n 1)))

Then give 100.

Racket will do too, but chez scheme is more fast.
A nice day for you
Francesco

Il giorno giovedì 23 maggio 2019 19:09:55 UTC+2, Josh Rubin ha scritto:

> I am just starting to learn Racket. Thank you, all Racket developers. 
> I read about the concept of using the Chez Scheme runtime system to 
> "host" Racket, so I looked into Chez, and found an interesting paper. 
>
> The Development of Chez Scheme by R. Kent Dybvig 
> https://www.cs.indiana.edu/%7Edyb/pubs/hocs.pdf 
>
> I like its discussion of Scheme implementation issues. I also enjoyed 
> reading about the author's evolution as a designer. 
>
>
> -- 
> Josh Rubin 
> jlr...@gmail.com  
>
>
>

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[racket-users] Chez Scheme history

[Josh Rubin]

I am just starting to learn Racket. Thank you, all Racket developers.
I read about the concept of using the Chez Scheme runtime system to 
"host" Racket, so I looked into Chez, and found an interesting paper.


The Development of Chez Scheme by R. Kent Dybvig
https://www.cs.indiana.edu/%7Edyb/pubs/hocs.pdf

I like its discussion of Scheme implementation issues. I also enjoyed 
reading about the author's evolution as a designer.



--
Josh Rubin
jlru...@gmail.com


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