I'm not sure what the qualitative distinction is between contracts and Typed
Racket. They seem like two syntaxes for what mostly amount to the same thing.
Is it just a matter of implementation, or perhaps what their developers focus
on? You could in theory read through a list of contracts, and
On Monday, February 15, 2016 at 5:43:38 PM UTC, Ryan Culpepper wrote:
> The macro should use `local-expand` rather than `expand`. See the docs
> for `local-expand`, since it takes more arguments. I would guess you
> probably want to pass along `(syntax-local-context)` and use an empty
> stop
On Monday, February 15, 2016 at 8:50:31 PM UTC, Matthew Butterick wrote:
> https://en.wikipedia.org/wiki/Blue_Flame_(automobile)
Oh, that's beautiful.
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On Monday, February 15, 2016 at 3:29:23 PM UTC, Neil Van Dyke wrote:
> Nota Poin wrote on 02/15/2016 05:40 AM:
> You seem to be itemizing complaints that come to your mind,
Sorry, I shouldn't have been complaining.
> but I don't
> see how all of them are responding to the questio
On Saturday, February 13, 2016 at 5:35:09 PM UTC, Saša Janiška wrote:
> So, at the end I just wonder how is it that such Wonderland is not
> discovered by much more people?
Startup is slow. Intractable problem, JIT compiling just takes time, and can't
be cached beforehand. Like with pypy vs
On Monday, February 15, 2016 at 4:07:53 AM UTC, Nota Poin wrote:
> (define-syntax (transform-post-expansion stx)
> (syntax-case (expand stx) ()
> (...)))
Right, expand the syntax to expand the syntax... that'll work out great...
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I suppose I could do something like this:
(define-syntax (transform-post-expansion stx)
(syntax-case (expand stx) ()
(...)))
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I was trying to transform the syntax produced by an (include/...) statement,
specifically (include/text) from scribble/text. But when I did this:
(transform (include "somefile.scribble")) it transformed the syntax #'(include
"somefile.scribble"), not the syntax produced from its expansion.
I'm
On Thursday, February 11, 2016 at 12:29:04 PM UTC, Neil Van Dyke wrote:
> http://www.neilvandyke.org/racket-html-template/
This does almost exactly what I was thinking about! Looking at the code makes
me go cross-eyed, but if you (expand-once #'(html-template ...)) enough, it
turns the SXML
On Friday, February 12, 2016 at 1:26:05 AM UTC, Matthew Butterick wrote:
> Of course, you can also use the `at-exp` metalanguage from Scribble to
> simplify text-heavy constructions like these, with variables interpolated
> into strings:
> #lang at-exp racket
>
> (define (query condA condB
I run into this problem a lot whenever I'm generating some text. I'll be making
what amounts to a sequence of strings being appended, and do something like
this:
(apply string-append
(list "" something ""))
Compared to un-parsing a representation of a document tree every single time,
On Thursday, February 11, 2016 at 9:08:33 AM UTC-8, Matthew Butterick wrote:
> I'm supposing you know that Racket has at least two native representations
> (X-expression and SXML) for HTML-like structures, so hacking HTML tags by
> hand is unnecessary.
Yes, thank you for mentioning them. I was
I guess this transformation is what I'm looking for:
(transform
(list
stuff ...
(if test
(list yes ...)
(list no ...))
more ...))
=>
(if test
(transform (list stuff ... yes ... more ...))
(transform (list stuff ... no ... more ...)))
but of course you can't
I don't really get what generics are. What is the difference between this:
(define show (generic window<%> show))
(send-generic a-window show #t)
and this:
(send a-window show #t)
If the former re...uses the (generic window<%> show) method to be "more"
efficient, then why isn't show already
I'm not sure why, but this works:
(unit
(import foo^)
(export bar^)
(+ foo bar)))
while this fails:
(define-syntax-rule (asyn body ...)
(unit
(import foo^)
(export bar^)
body ...))
(asyn (+ foo bar))
with the error "unit: undefined export" for any imported variables.
On Saturday, November 28, 2015 at 11:24:28 PM UTC, Matthew Flatt wrote:
> That is, `import` is a binding form, just like `let`.
Oh, that makes sense. So it gets swapped in the macro for a hygenic named
variable, and the ones I pass by that name don't get swapped in the same
fashion, thus aren't
I'll have code like this:
#lang racket/base
(define (baz foo)
(error 'whoops))
(define (bar ber)
(baz ber))
(define (foo ber)
(let ((a 3))
(if (and
(= a 3)
(= (* a 9) 27)
(bar ber)
(list? (list 1 2 3 4)))
On Monday, November 9, 2015 at 1:38:56 AM UTC, Matthias Felleisen wrote:
> Use drracket.
Yeah, I would, but it takes about 30 seconds to start up if I disable all the
extensions, add another 10 or 20 for the debugger, and then when I type it lags
behind at about 0.25s per character. Also it
On Monday, November 9, 2015 at 3:17:59 AM UTC, Neil Van Dyke wrote:
> Note that, unlike some languages, I *don't* want `x` and `y` to be
> optionally positional -- only keyworded.
In my opinion, supplying a default value should make an argument implicitly
keywordable. So (define (a b c (d 3) (e
On Wednesday, October 14, 2015 at 12:30:54 AM UTC, Daniel Feltey wrote:
> Some of the verbosity of units can be reduced using the "inference" features
> that Racket's unit system provides.
Hmm, I gave it a shot, and this seems to work. Not sure if it'd be especially
useful. But fwiw
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On Tuesday, October 13, 2015 at 11:40:12 PM UTC, Alexis King wrote:
> Have you taken a look at parameters?
Short answer: yes. Long answer: they're convenient thread-local globals, but
still feel like globals to me.
(define a (make-parameter 0))
(define (called-at-hopefully-regular-intervals)
On Tuesday, October 13, 2015 at 11:40:12 PM UTC, Alexis King wrote:
> units
Oh uh, conceivably you could have "code" that provided a live session object on
linking, and handled session refreshing internally, then just link that with
units that have session dependant code. I just never found any
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