wase
>> > wrote:
>> > >
>> > > I had this exact same question when I looked at the RacketScript issue
>> > > lol.
>> > >
>> > > The answer is https://docs.racket-lang.org/reference/numbers.html:
>> > >
>> >
Sorry, the "workaround" was in regard to complex numbers. How to
support them in a minimal way so that programs that dont use them are
not blocked by lack of full support.
On Fri, Nov 19, 2021 at 3:20 PM Sam Tobin-Hochstadt wrote:
>
> On Fri, Nov 19, 2021 at 3:13 PM Step
ang.org/reference/numbers.html:
>
> a complex number with an exact zero imaginary part is a real number.
>
> Since 0.0 is not exact, 0.0i is not a real number.
>
> On Fri, Nov 19, 2021 at 11:59 AM Stephen Chang wrote:
>>
>> In the following, why is the first considered a re
In the following, why is the first considered a real number but the
second considered not real
> (real? 0.0+0i)
#t
> (real? 0.0+0.0i)
#f
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To unsubscribe from this group and stop receiving emails fr
> shouldn't the entire parenthesized expression be given to the macro processor
> and then replaced with something valid before being rejected?
That would be true if you're defining a macro, i.e. if you use
`define-syntax` instead of `define`.
>
> --
> You received this message because you are s
)
>
>
> At Fri, 21 May 2021 11:33:41 -0400, Stephen Chang wrote:
> > Hi,
> >
> > It seems that, since 8.1, the format of paths in links.rktd has changed?
> >
> > Are there new API fns that deal with this new kind of encoded path? Or
> > what is the rec
Hi,
It seems that, since 8.1, the format of paths in links.rktd has changed?
Are there new API fns that deal with this new kind of encoded path? Or
what is the recommended way to process them?
Something like this? (Is this `decode-link-path` public? I couldnt find it)
https://github.com/racket/r
Hi everyone, Has eq? behavior changed with Racket CS? (ie, 8.0+)
Specifically:
$ racket79/bin/racket
Welcome to Racket v7.9 [bc].
> (eq? (integer->char 955) (integer->char 955))
#f
$ plt/racket/bin/racket
Welcome to Racket v8.1.0.6 [cs].
> (eq? (integer->char 955) (integer->char 955))
#t
Is thi
> I am somewhat surprised that the graph library enforces numerical edge
> weights at all.
The docs do informally say number weights but I don't think the
constructors do any checking? Any enforcement should be deferred to
individual algorithms.
Re: graphviz, I took a quick look and I think we c
Your second suggestion is described in this (hard to find) section of
the TR Guide on Type Generalization:
https://docs.racket-lang.org/ts-guide/caveats.html#%28part._.Type_generalization%29
I agree it should be much more prominent. At the very least, any docs
for invariant constructors should lin
As mentioned, to get your macro to work, you have to change how the
reader behaves on "|".
You might be interested in the (implementation of) no-vert-bar reader lang:
https://docs.racket-lang.org/no-vert-bar-lang/index.html
On Mon, Feb 3, 2020 at 6:27 PM Kevin Forchione wrote:
>
> Hi guys,
> I’
I dont know much about J, but if I'm understanding correctly, you have
an implementation of J in Typed Racket?
And then you want to be able to infer more specialized cases in some
instances by pruning the type?
You might be able to do it with just plain macros in that case, which
would generate `
As William mentioned, the example conflates Typed Racket types with
surface language types, which would probably not be right even if
Typed Racket did not complain.
Does your custom language have its own type system? If not, you may
not need to use Turnstile. Plain macros that expand to Typed Rack
I don't know of a more efficient way to convert, but depending on what
operations you want, you might be able to compute it directly on the
hash, e.g., see hash-has-key?, hash-keys-subset?, hash-union, etc. (I
didnt know about some of the functions until recently.)
On Fri, Oct 25, 2019 at 4:21 PM
ity of RacketScript has not
changed. It is in the same experimental state and supports the same
subset of Racket as before.
On Wed, Oct 2, 2019 at 2:04 PM Hendrik Boom wrote:
>
> On Wed, Oct 02, 2019 at 01:53:46PM -0400, Stephen Chang wrote:
> > The RacketScript compiler [1] has been up
The RacketScript compiler [1] has been updated to work with Racket 7.x
programs, ie all tests pass (though we are still working to support
more primitives).
Try it out here: http://rapture.twistedplane.com:8080/
The next milestone is to improve RacketScript enough to compile the
Racket expander [
In case this issue is still unresolved, I just ran into this error
message because I accidentally installed a 64 bit distribution when I
needed 32-bit.
On Tue, Jun 16, 2015 at 12:11 PM Vincent St-Amour wrote:
>
> Hi,
>
> How did you install Racket? It looks like you have used the wrong
> installe
If `define-values` is not strictly required, here's a more
syntax-case-y recursive version:
(define-syntax (aux stx)
(syntax-case stx ()
[(_) #'(begin)]
[(_ (var val) . rst)
(identifier? #'var)
#'(begin
(define var val)
(aux . rst))]
[(_ var . rst)
(i
> For the same reasons I would use a `let` around a code block -- it's an easy
> way to isolate computation and create reusable elements. What would a more
> normal way be when using syntax-parse?
The #:with syntax-parse "pattern directive" does the same thing, but
with less parens.
https://doc
answer 1) You are missing a dot in (~@ propthing), ie this will work:
(~@ . propthing)
minor question) is there a reason you are using with-syntax with syntax-parse?
answer 2) You may want to try "attribute". It's somewhat like
"syntax", except it returns false when there are unbound patvars, eg:
https for lists.racket-lang is not working at the moment. Sorry for
the inconvenience. The server hosting lists.racket-lang went down
recently. A partial temporary non-https version is up but https hasnt
been enabled yet.
On Mon, May 6, 2019 at 12:48 PM David Storrs wrote:
>
> I'm not sure if thi
fwiw, I think here is a working version along the lines of your
original attempt.
#lang racket
(require (for-syntax syntax/parse))
(define-syntax set/define
(syntax-parser
[(_ h k v)
#:when (with-handlers ([exn:fail:syntax:unbound? (lambda _ #f)])
(local-expand #'h 'expre
Hi Claes, Thanks for the effort in splitting the package.
Would any users of the graph library object to dropping support for 5.x?
On Tue, Dec 11, 2018 at 10:19 PM Claes Wallin (韋嘉誠)
wrote:
>
> I am trying to split the package graph into graph-doc and graph-lib,
> see: https://github.com/stchang/
Oops, I didnt see the rounding.
On Mon, May 7, 2018 at 7:53 PM, Ben Greenman
wrote:
> I use this:
> http://docs.racket-lang.org/gtp-util/index.html#%28def._%28%28lib._gtp-util%2Fmain..rkt%29._rnd%29%29
>
> I didn't know about SRFI 54 --- looking forward to reading other responses.
>
> --
> You re
~r
http://docs.racket-lang.org/reference/strings.html?q=~r#%28def._%28%28lib._racket%2Fformat..rkt%29._~7er%29%29
On Mon, May 7, 2018 at 7:46 PM, 'John Clements' via Racket Users
wrote:
> Okay, how many times have I written the function that accepts 1.237472387 and
> returns “1.24” ? What do you
Here's a version of your program that performs as you specified:
http://pasterack.org/pastes/91460
But do take a look at the paper, docs [1], or codebase [2], which
turns this idea into complete languages.
[1]: http://docs.racket-lang.org/turnstile/index.html
[2]: https://github.com/stchang/macro
Hi Alexis,
Great article. And timely too, since it addresses some of the same
usage issues of local-expand and stoplists that we ran into with
Turnstile.
(I'm also interested in why the core forms are added to the stop list.
Is it because of let-syntax? I know it's probably been mentioned
before
For those who don't have drracket handy: http://pasterack.org/pastes/59296
On Mar 24, 2018 4:26 PM, "Jos Koot" wrote:
>
> Very nice,
> Jos Koot
>
>
> From: racket-users@googlegroups.com [mailto:racket-users@googlegroups.com] On
> Behalf Of Sanjeev Sharma
> Sent:
I frequently want to run the same tests with different #lang's.
Has anyone written a test harness that lets me do this without
duplicating the test code? (I couldnt find anything on the pkg
server.)
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It's fixed now. Cron job didn't run for some reason. Thanks for the heads up!
On Fri, Mar 9, 2018 at 12:42 PM, 'John Clements' via Racket Users
wrote:
>
>
>> On Mar 9, 2018, at 8:25 AM, Tim Hanson wrote:
>>
>> Hi, I tried to grab the latest racket version from download.racket-lang.org
>> and ch
Ran into some unexpected behavior today. Quoted values do not seem to
be garbage collected when there are only weak references. Is this
correct behavior?
Here's an example program:
#lang racket/base
(define key1 (list 1))
(define key2 '(1))
(define hash1 (make-weak-hash (list (cons key1 1
I believe Racket uses HAMTs [1] for immutable hash tables.
[1]: http://lampwww.epfl.ch/papers/idealhashtrees.pdf
On Wed, May 24, 2017 at 11:01 AM, 'John Clements' via users-redirect
wrote:
> I’m introducing hash tables to students in a first-year class. Is there a
> handy reference for the impl
The inner ellipses need to be "escaped". I like using the dot notation
in nested macros but I know others do not like that style.
(define-syntax (test stx)
(syntax-case stx ()
((_ n e ...)
#'(define-syntax (n stx)
(syntax-case stx ()
((_ e0 (... ...))
#'
You get the dreaded "bad syntax" because syntax-parse doesnt know
which pattern failed. There a couple of things you can do:
1) Use a commit pattern, which tells syntax-parse not to backtrack
past the commit point. You have to change the order of patterns for
this to work.
(define-splicing-synt
combine-out may help simplify things?
(define-syntax my-out
(make-provide-transformer
(lambda (stx modes)
(syntax-parse stx
((_ name:id)
#:with mk-name (format-id #'name "make-~a" #'name)
(expand-export #'(combine-out name mk-name) modes))
or
(define-provide-
David Van Horn wrote:
>> Thanks, this does make the section heading a link, but in the table of
>> contents or in the left hand navigation bar, the link is to the
>> (empty) section, not the URL. What I'd like is for the navigation
>> links to go to the URL.
&
Does `hyperlink` do what you want?
eg
@section{@hyperlink["http://google.com"]{The Google}}
On Sat, Mar 4, 2017 at 1:49 PM, David Van Horn wrote:
> I'm using scribble to make a web page and I'd like a section-like
> heading that is just a link to an external URL, but I don't see how to
> do thi
Not with map, which requires equal-length arguments.
You could do the slightly less ugly:
(map
foo
lst-A
lst-B
(range (length lst-A)))
On Thu, Mar 2, 2017 at 11:14 AM, David Storrs wrote:
>
>
> On Thu, Mar 2, 2017 at 10:09 AM, Stephen Chang wrote:
>>
>&g
The in-X forms are sequences, and must be used with the sequence API, ie for/X.
map only works with lists, so you could use build-list or range:
(map
foo
lst-A
lst-B
(range 2))
On Thu, Mar 2, 2017 at 9:55 AM, David Storrs wrote:
> I'd like to be able to do something like this:
>
I like the current structure of the docs but Ethan's comments reminded
of recent blog posts by Eric Raymond (of "Cathedral and the Bazaar"
fame), who surprisingly advocates against "swarm design". The posts
are about Rust but maybe it's something to keep in mind if the package
system gets much larg
I have a package whose tests are timing out when run by pkg-build. Is
there a way to extend this timeout?
I know I can specify individual file timeouts with `test-timeouts` but
I couldnt figure out how to specify a timeout for testing the whole
package. Is this possible?
Steve
--
You received t
> Do you have plans to revist the tail call question within RacketScript?
Yes we do. The readme includes that statement just to be upfront with
users about racketscript's philosophy and what to expect when trying
racketscript.
That being said, RacketScript currently converts self-tail-calls to
lo
I missed this thread when it first went by.
I backup the pasterack db occasionally and I don't delete pastes,
other than illegal stuff as determined by a nightly script. But the
redis db only writes to disk every so often so some pastes could get
lost. (Ironically the links in question are no long
> What are the implications of this for the Types as Macros/Turnstile
stuff?
As William mentioned, he's also working on a language using the Types
as Macros approach. Alex and I have run into the same issue, but it's
always with compiled files (without compiling, requires and provides
appear to be
nks, I'll try that.
> It is not clear to me where I can use @#,
> But certainly your response will be a great help for me.
> Thanks again, Jos
>
> -Original Message-
> From: stchang...@gmail.com [mailto:stchang...@gmail.com] On Behalf Of Stephen
> Chang
> Sent:
You can use the escape identifier:
#lang scribble/manual
@(require scribble/eval
(for-label racket))
@interaction[
(define a (list 1))
(define b (list 1))
(code:comment @#,para{a and b are not @racket[eq?], but they are
@racket[equal?]:})
(eq? a b)
(equal? a b)]
On Tue, Nov 29, 2
Hi Lawrence,
Can you provide some more context? Are you looking to learn about
graphs in general, or specifically about the graph library API.
For the former, any well known algorithms textbook should have a
decent introduction. I used CLRS [1] as a guide when developing the
library.
For the la
string-join already expects a list of strings, so are you sure you want apply?
Can you give a more specific example?
Perhaps map or some other iteration is what you want?
(for ([strs '(("a" "b") ("c" "D" "E"))])
(displayln (string-join strs " ")))
=>
a b
c D E
On Sat, Oct 29, 2016 at 10:27 AM
Yes, that worked. Thanks.
On Sun, Oct 9, 2016 at 8:11 AM, Matthew Flatt wrote:
> Does `syntax-local-lift-module-end-declaration` work?
>
> At Sat, 8 Oct 2016 19:29:19 -0400, Stephen Chang wrote:
>> I'm trying to write a provide transformer that wraps a provided
>> id
I'm trying to write a provide transformer that wraps a provided
identifier and then provides that instead.
For example,
#lang racket
(require (for-syntax syntax/parse racket/provide-transform))
(define-syntax wrapped-out
(make-provide-pre-transformer
(lambda (stx modes)
(syntax-parse st
Vishesh Yadav wrote a DrRacket plugin that automatically compiles a
program to JS via whalesong and uploads it to a server. It sounds
related to what you are describing so you may want to take a look at
his code.
The plugin code is here: https://github.com/vishesh/drracket-whalesong
in particular
Cool! Will definitely check it out.
Is this at all related to Vincent's work? [1]
[1]: https://github.com/stamourv/rash
On Sat, Aug 20, 2016 at 3:17 PM, William G Hatch wrote:
> Hello everyone,
>
> Being obsessed with shells and wanting very badly to have a racket
> shell, I've spent a good chu
> It was also suggested that it is not in src/Makefile, instead:
"I'm usually in the top-level checkout dir", to quote stamourv.
Is this what you're looking for?
https://github.com/racket/racket/blob/master/Makefile#L153-L160
On Wed, Aug 3, 2016 at 1:02 PM, Tim Brown wrote:
> Here's hoping someo
> It may be overkill for this use case, but I would probably use the
> parsack package, since I think its interface is pretty intuitive.
:) I had started writing up a parsack example, and I was all set to
admonish the OP for not creating a parser when you want a parser but
then I saw it was for a
A "read" variant that works with format strings would be a useful
addition I think.
Matthew, your solution is clever :) (but with symbols instead of strings).
Another alternative could be to use match:
#lang racket
(define (trim-brackets str)
(string-trim str #rx"\\[|\\]|,"))
(define (pad n
You can also submit the code to pasterack.org, which uses the scribble
css. Each paste page also gives the html source of the code and output
on the side, which you can copy to anywhere you want.
On Tue, Mar 15, 2016 at 7:11 PM, Sanjeev Sharma wrote:
> is there a quick & dirty way to use scribble
Do you mean something like?
#lang racket
(require rackunit)
(require rackunit/gui)
(define tests
(test-suite
"my tests"
(test-equal? "check 1" 1 1)
(test-equal? "check 2" 2 2)))
(test/gui tests)
But that will pop a window. Alternatively,
#lang racket
(require rackunit)
(require rackun
In general, times reported in DrRacket are unreliable.
See:
https://docs.racket-lang.org/guide/performance.html#%28part._.Dr.Racket-perf%29
Try the command line. Here's what I get on my machine:
$ ~/racket61/bin/racket
Welcome to Racket v6.1.
-> (define (total n)
(for/sum ([x (in-range (+
Use display? or set read-accept-bar-quote to #f
On Wed, Mar 2, 2016 at 1:12 PM, Marco Morazan wrote:
>
> Hi All,
>
> I seem to recall I knew how to do this once, but can't recall the details.
>
> How do we write a blank to a text file without the parallel bars appearing?
>
> So, (write '| | outfi
Thanks for the report. Which version are you using? I'm seeing that
the behavior appears in 6.3 but is fixed in 6.4.
On Wed, Feb 24, 2016 at 4:22 PM, Jeffrey Edgington wrote:
> I am getting an unexpected message from check-expect when I try the following:
>
> #lang racket
> (require test-engine/r
I added similar basic tests here.
https://github.com/racket/racket/blob/master/pkgs/racket-test-core/tests/racket/hash.rktl
On Feb 13, 2016 4:12 PM, "Robby Findler"
wrote:
> I think this is what you want?
>
> (chaperone-hash
> (hash)
> (λ (h key) (values key (λ (h key val) val)))
> (λ (h key
nce there's no agreement, I'll leave it for now.
I'll just add a special case for empty vectors and 0,0.
It's probably not worth it to add yet-another new special case, as in
Matthew's email, right?
>
> Robby
>
> On Tue, Jan 19, 2016 at 1:16 PM, Stephen Chang wro
tor 1 2) 1 1)
On Tue, Jan 19, 2016 at 2:06 PM, Vincent St-Amour
wrote:
> Would it be possible to special-case `(in-vector (vector) 0 0)`
> directly, and fix the bug while keeping backwards compatibility?
>
> Vincent
>
>
> On Tue, 19 Jan 2016 12:19:12 -0600,
> Stephen Cha
I'm fixing pr 15227 but I would like to do so in a backwards-incompatible way.
Right now an out-of-range index is sometimes allowed as an argument to
in-vector, leading to the bug:
$ racket
Welcome to Racket v6.4.0.4.
-> (for/sum ([x (in-vector (vector 10 20) 2 -1 -1)]) x)
SIGSEGV MAPERR si_code
uld like it to match on all phases?
>
> ~Leif Andersen
>
>
> On Wed, Dec 16, 2015 at 10:02 PM, Stephen Chang wrote:
>> There's a #:phase option available when specifying literals:
>>
>> http://docs.racket-lang.org/syntax/Parsing_Syntax.html?q=syntax-parse#%28form._%
There's a #:phase option available when specifying literals:
http://docs.racket-lang.org/syntax/Parsing_Syntax.html?q=syntax-parse#%28form._%28%28lib._syntax%2Fparse..rkt%29._syntax-parse%29%29
On Wed, Dec 16, 2015 at 9:55 PM, Leif Andersen wrote:
> Okay, that makes sense, thanks.
>
> So out of
This paper is not about Racket but reports on an r7rs implementation
experience and so may have some helpful hints:
http://www.schemeworkshop.org/2014/papers/Kato2014.pdf
On Oct 25, 2015 5:18 PM, "Alexis King" wrote:
> I have built a very small, very incomplete implementation of R7RS in
> Racket
pasterack uses make-module-evaluator in a sandbox. It's also still
running 6.1.1. Would either of those cause the observed difference?
On Wed, Oct 21, 2015 at 9:18 PM, Matthew Flatt wrote:
> An empty closure is allocated as a constant --- similar to a literal
> string or literal fraction in your
Thanks for the report. The Irc connection is always finicky. I've restarted
the server and the bot seems to be working again.
On Sep 12, 2015 8:26 AM, "Paolo Giarrusso" wrote:
> Hi!
> When I try to notify myself on #racket, PasteRack fails with:
> ```
> Exception
> The application raised an excep
Hi Racket users,
This past summer, Vishesh Yadav created a web application to
facilitate sharing of Racket programs as Javascript (big-bang programs in
particular).
Vishesh is exploring improvements to Whalesong as part of a master's
thesis, taking a descriptive approach and focusing on how Racke
Is there a way to access an attribute, other than with the "." syntax?
For example, the following example does not work:
#lang racket
(require (for-syntax syntax/parse))
(define-syntax (define-stuff stx)
(syntax-parse stx
[(_ attr-name macro-name)
#'(begin
(begin-for-syntax
You might want to specify "collect" in #:datum-literals if it is not a
defined name.
Can you describe some usage examples? That may lead to better insight
for the implementation.
On Fri, Jul 31, 2015 at 11:49 AM, Deren Dohoda wrote:
> Suppose I have a macro (experiment ...) which is intended, am
For any f, acc, and lst, (foldl f acc lst), from left-to-right,
applies to f to each element of lst and the current accumulated value.
The initial accumulator is acc so the second intermediate accumulated
value is (f (first lst) acc). Replacing f, acc, and lst with your
arguments, the second interm
What's the output you expected?
Does this post help you?
http://stackoverflow.com/questions/8778492/why-is-foldl-defined-in-a-strange-way-in-racket
On Wed, Jul 29, 2015 at 9:45 AM, wrote:
> Dear racket maintainers,
>
> Maybe, I found a bug.
>
>> (foldr (lambda (x y) (list x y)) '() '(a1 a2 a3 a
the Definition class?
On Sat, Jul 25, 2015 at 10:51 AM, Stephen Chang wrote:
> I haven't played with the example in detail, but do you want the cut
> operator here?
>
> http://docs.racket-lang.org/syntax/stxparse-patterns.html?q=syntax-parse#%28form._%28%28lib._syntax%2Fparse..rk
I haven't played with the example in detail, but do you want the cut
operator here?
http://docs.racket-lang.org/syntax/stxparse-patterns.html?q=syntax-parse#%28form._%28%28lib._syntax%2Fparse..rkt%29._~7e!%29%29
On Sat, Jul 25, 2015 at 9:55 AM, Jens Axel Søgaard
wrote:
> Hi All,
>
> The syntax-p
I understand now. I still claim that an (explicit) inner loop is not needed:
(define (validate-ranges5 value-list low-list high-list)
(for*/fold ([failures 0])
([(lo hi) (in-parallel low-list high-list)]
[v value-list]
#:when (< lo v hi))
(printf "\n*
Perhaps I don't understand the problem, but why is the inner loop necessary?
By the way, you can use (printf ...) instead of (fprintf
(current-output-port) ...)
Would this work?
(define (validate-ranges2 value-list low-list high-list)
(for/sum ([v value-list]
[lo low-list]
The Style Guide is a good place to start for learning Racket
conventions: http://docs.racket-lang.org/style/index.html
Overall, things look good! Your code already uses many Racket idioms.
Some things that caught my attention on first glance:
- The code is wider than typical. Though tastes diffe
, 2015 at 11:05 AM, Stephen Chang wrote:
> Racket has linguistic support for keyword arguments, which address
> many of the issues you raised:
> http://docs.racket-lang.org/guide/keywords.html
>
> Would this help in your case?
>
> Additional background: http://www.cs.utah
Racket has linguistic support for keyword arguments, which address
many of the issues you raised:
http://docs.racket-lang.org/guide/keywords.html
Would this help in your case?
Additional background: http://www.cs.utah.edu/plt/publications/scheme09-fb.pdf
On Mon, Jul 6, 2015 at 10:56 AM, John Car
> Perhaps this isn’t applicable in this case, but may I suggest a less-common
> alternative: no prefixing at all? If you put all the commands into a separate
> module, users of the module can use ‘prefix-in’ to choose whatever prefix
> they prefer.
Prefixes (and suffixes) have two purposes. One
Actually, ~a by itself might do what you want.
(~a 1 2 3) ; => "123"
On Fri, Jul 3, 2015 at 4:18 PM, Stephen Chang wrote:
> I think the call to "values" is misplaced.
>
> Here's a functioning version of foo, and a perhaps more concise alternative:
>
&g
I think the call to "values" is misplaced.
Here's a functioning version of foo, and a perhaps more concise alternative:
(define (foo . L)
(let ([bar (string-join (build-list (length L) (λ (x) "~a")) "")])
(apply format bar L)))
(define (my-foo . L)
(string-join (map ~a L) ""))
On Fri, J
> The prefixes are based on this file:
> https://github.com/racket/gui/blob/master/tex-table/tex-table.rkt
>
> Maybe there are missing ones you're used to?
Sorry, that was supposed to be a compliment! I love DrRacket's support
for unicode and I havent wanted any symbols that aren't already
support
> Robby
>
> On Fri, Jul 3, 2015 at 12:36 PM, Stephen Chang wrote:
>>> What symbols have the least historic baggage?
>>
>> I've gone through this exercise a few times, and each time settled on '$'.
>>
>> As Greg points out, pretty much every
> What symbols have the least historic baggage?
I've gone through this exercise a few times, and each time settled on '$'.
As Greg points out, pretty much every one of my my Racket libraries
makes use of this symbol (was it that obvious? :) ) exactly because I
was looking for something that Racke
Would any of the functions in unstable/list help? For example,
#lang racket
(require unstable/list)
(define (gather lst)
(for/hash ([g (group-by car lst)])
(values (caar g) (append-map cdr g
(gather '((a c) (a d) (b e) (b f)))
; => '#hash((a . (c d)) (b . (e f)))
On Thu, Jun 11, 2015
> Once I get my head around what's needed to connect up a custom
> reader
Matthew's example from his talk at the first RacketCon (and other
conferences) might be a good place to start:
https://github.com/mflatt/scratchy/blob/master/scratchy/reader.rkt
https://github.com/mflatt/scratchy/blob/master
Glad you're having a good time!
I think you should be able to use it to implement your language's
reader but I don't have any actual experience doing so.
I seem to recall that Racket used to come with a combinator parser
library. It's been removed but I don't remember why but maybe that
could be
> ./racket: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.14' not found
> (required by ./racket)
I just ran into this problem and a search led me to this thread, thanks.
I am running Debian 7.8 wheezy which includes glibc 2.13. I originally
used the Ubuntu 12.04 (Precise) 64bit installer fro
This is really neat!
I tried the guessing game and it seems to have a bug though?
> (guess)
50
> (smaller)
25
> (bigger)
37
> (bigger)
37
On Tue, Mar 3, 2015 at 10:22 AM, Matthias Felleisen
wrote:
>
> Thanks. This is really neat. When (if really) I ever find time, I would love
> to help with pu
wer is 'currently not possible but doable in
principle'.
>
> -- Matthias
>
>
>
>
>
> On Feb 27, 2015, at 6:12 PM, Stephen Chang wrote:
>
>> Is there any way to run a big-bang universe server without the gui?
>>
>> Or more generally has anyo
Is there any way to run a big-bang universe server without the gui?
Or more generally has anyone figured out how to run a big-bang
universe server on a headless server?
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Ok so something like @section{@hyperlink["http://google.com"]{google}}
is insufficient because the side link doesnt go to google?
On Mon, Jan 26, 2015 at 4:19 PM, David Van Horn wrote:
> On 1/26/15 4:14 PM, Stephen Chang wrote:
>>> Is there a way to make @link that a
> Is there a way to make @link that appears like a @section heading? I
> want to have links to external URLs that appear as though they're
> section headings in a scribble-based web page.
So you want the link to have the style of a section header but not
actually be registered as a section?
>
>
y what I was looking for, thanks!
>
> At Sun, 23 Nov 2014 16:43:48 -0500, Stephen Chang wrote:
>> If my scribble file begins with #lang scribble/manual, I get the new
>> css, but if I use #lang scribble/base, I get the old look and I can't
>> figure out how to change it. Th
If my scribble file begins with #lang scribble/manual, I get the new
css, but if I use #lang scribble/base, I get the old look and I can't
figure out how to change it. This is with 6.1.1.4.
I can of course, start with scribble/manual, grab the files, and then
switch back to scribble/base, but I th
n ..) and then access doc that way.
> I did this for last year's course page in scribble.
>
>
>
> On Nov 21, 2014, at 2:34 PM, Stephen Chang wrote:
>
>> Is this allowed?
>>
>>
>> File A.scrbl:
>>
>> #lang scribble/manual
>>
>>
>&
Is this allowed?
File A.scrbl:
#lang scribble/manual
File B.scrbl:
#lang scribble/manual
@(require "A.scrbl")
Right now when I run B, I get the error:
module: identifier is already imported in: doc
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