In the following code, (make-syntax-delta-introducer a b) and
(make-syntax-delta-introducer b a) have scopes in common (#(8979 module) and
#(8980 module m 0)), which are part of both inputs. The docs do not mention
that some scopes present in both `a` and `b` can be part of the resulting
introd
Le samedi 16 juillet 2016 09:20:33 UTC+2, mattap...@gmail.com a écrit :
> I wonder if there's a way to get the contract of functions in the libraries?
>
> PS. I'm trying to find target functions in the namespace that'll 'match' the
> values I have (i.e. that can 'work with' the values I have). An
I have two files, `a.rkt` and `b.rkt`:
;; a.rkt
#lang racket
(provide foo)
(define-syntax (foo stx)
;; Do some compile-time side effects here…
#'(begin))
;; b.rkt
#lang racket
(require "a.rkt")
(foo)
The `foo` macro defined in `a.rkt` does some side effects, and expands to
`(begin)`. When `
Le vendredi 12 août 2016 14:53:35 UTC+2, rumpz a écrit :
> It's like it marked down somewhere that those structs refer to the definition
> of "word" in webapp/words.rkt, and not the one in webapp2/words.rkt
This sounds to me like it is using the old bytecode files, since the original
files haven
Le jeudi 18 août 2016 22:21:37 UTC+2, jos.koot a écrit :
> #lang scribble/manual
> bla blah blah@(linebreak)
> blah blah bla @superscript{blah blah bah}@(linebreak)
> bla blah blah
>
> the linespacing between the first 2 lines is larger
> than between the last 2 lines.
I suppose you are talking a
Based on Asumu's work on type expanders
(https://github.com/racket/racket/compare/master...takikawa:tr-type-expander),
I have written a library which adds support for type expanders in typed/racket.
Type expanders are to types what match expanders are to match patterns. A type
expander is a spe
I'll add a few relevant and less relevant references:
This discussion [1] is about extending drracket's built-in indenter, using
`drracket:indentation` [2]. The #lang's get-info function should accept that
symbol as a key, and return an indentation function.
To access the default indentation by
Le jeudi 25 août 2016 23:47:21 UTC+2, Matthias Felleisen a écrit :
> If Travis re-indented my benchmarks/samples every time I commit one, I would
> be rather unhappy.
I think that's what David meant by "A way to represent indentation
specifications for new syntactic forms": the idea would be to
Le vendredi 26 août 2016 00:02:13 UTC+2, Matthias Felleisen a écrit :
> The specification has to come with feature and/or the language, not the tool.
> How would Emacs know about it? Or Notepad? Every editor — and every tool in
> the tool chain — must know what indentation means if it may touch i
I'm starting a new discussion topic, so as not to crowd
https://groups.google.com/forum/#!topic/racket-users/4SnwpX6gYqk .
2016-08-26 0:32 GMT+02:00 Alex Knauth :
> How would a library express indentation rules? Would indentation rules
meant for s-expression languages be useful in at-exp or sweet-
Le samedi 27 août 2016 03:54:00 UTC+2, Anthony Carrico a écrit :
> On 08/26/2016 11:10 AM, Matthias Felleisen wrote:
> Likewise. Can you say something for us lurkers about the use cases? Do
> you think it is workable to have an identifier act as a type expander,
> match expander, normal macro and i
Le vendredi 2 septembre 2016 12:32:52 UTC+2, Jack Firth a écrit :
> However, (parameterize ([param tool-func]) (dynamic-require mod-path))
> doesn't seem to work because the parameter is being set for the runtime phase
> rather than the expansion time phase.
Here's a solution, which also allows
Le dimanche 4 septembre 2016 01:44:01 UTC+2, David K. Storrs a écrit :
> Welcome to DrRacket, version 6.6 [3m].
> Language: R5RS [custom]; memory limit: 128 MB.
It seems that DrRacket is configured to use the R5RS language. Using the
bottom-left menu (or Ctrl+L), select "The Racket language Use #
Hi all!
I'm trying out redex, and I defined a simple language with (define v e)
statements. I also defined an extended language, which allows expressions to be
(lifted v' e'). A (lifted v' e') expression is replaced by v', and a definition
(define v' e') is lifted to the top-level, just before
Le mardi 6 septembre 2016 20:39:37 UTC+2, Sam Caldwell a écrit :
> I'm not sure what it is you want. Do you want the reduction relation to be
> deterministic? If so then you need to decide which order is the "right" one.
>
> You can do this by adding a "lifted-less expression" to your grammar
Th
I'm writing a prop:equal+hash for a recursive data structure, and I noticed
that it takes several comparisons of pairs of values which are eq? before
equal? realises that there is a cycle, and stops.
Below is the code for the trivial case, where the implementation of equality
just calls itself
Le mardi 13 septembre 2016 16:30:39 UTC+2, Robby Findler a écrit :
> http://www.cs.indiana.edu/~dyb/pubs/equal.pdf
Thanks a lot for the reference, I was looking for that.
If I understand well, equal? first tries a fast algorithm which does not take
cycles into account, and after a certain level
Le samedi 24 septembre 2016 18:46:07 UTC+2, William G Hatch a écrit :
> Udelim is a library for adding extra parens and string delimiters to
> your language.
I can't tell how ecstatic I am about this :) . I have been wanting to add new
parenthesis shapes for a while, but never found the time to l
If I understand you well, the intended use of your nested delimiters can be
more or less described as syntactic sugar for #reader, with auto-detection of
where the string ends:
(filter foo?
(python-ish-list-comprehend
«thing for x in sqlish(«select * from foo») where some_pred
I have two simple scribble files. The first one simply includes the second:
#lang scribble/manual
@title{test-tag-prefix}
@include-section{sub.scrbl}
And the second one uses #:tag-prefix, and inserts an @elemref in the TOC:
#lang scribble/manual
@title[#:tag-prefix '(lib "test-tag-prefix/s
Le vendredi 30 septembre 2016 14:30:05 UTC+2, Dupéron Georges a écrit :
> Is there a better way to automatically generate this tag?
> I can store the document tags within a global variable and cons them
> everywhere I'm inserting an @elemref in the Table Of Contents, but it
> seem
Thanks a lot for the fixes, Matthew!
The workaround was not too much of a problem to set up in the end (the elemref
were generated by a macro in my case, so I just had to use make-link-element +
the global variable instead of elemref). I'll probably get rid of it once a new
version with your fi
My experience with check-syntax is that several conditions have to be met:
* The identifiers must have the correct source locations (actually, you can
make arrows point to weird places by faking the source locations)
* The properties must be present high enough in the AST. For example, if you
pu
This is great! Thumbs up, and thanks for writing this library. I have a couple
of filesystems in my "TODO" list, hopefully this package will motivate me to
actually write them one of these days :) .
A nice feature would be some simpler API for creating filesystems which work by
virtually moving
Maybe it's in /Users/dstorrs/Library/Racket/bin, or something like this?
otherwise, this command shoul hopefully show the file's path if it is on your
system:
find / -name protoc-gen-racket
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To u
Sam, would something like this work for you?
I'm using the generic-syntax-expanders library to easily define expanders
(sorts of macros) which are expanded within uses of a wrapper of
define-judgment-form.
#lang racket
(require (rename-in redex
[define-judgment-form orig:
Be aware that `expand-all-judgment-form-expanders` does what it says on the
tin: if the `(define-judgment-form …)` contains something that should in
principle shadow the expander, e.g. something equivalent to `(let ([where/not
(λ (x) 42)]) (where/not 'blah))`, then the `expand-all-judgment-form-
> The only issue is converting our mountain of code that uses the old syntax
> (more than 40,000 lines, if you can believe it).
I would suggest keeping the old syntax too via {~or #:blend {~and blend-stx
blend}}, but making it log a warning when (attribute blend-stx) is true,
printing (syntax-s
A few ideas:
1) Loading a lot of modules can be slow. You are already avoiding that by using
racket/base and racket/gui/base, so that's good, but it already takes me 0.5s
just to require these :-( . I don't know it there is much to do about this.
2) Your main.rkt might be doing a some lengthy in
I'm writing a meta-language (a small extension of scribble/lp2), which
delegates to a second language. I am using the neat trick suggested to me by
Alex Knauth [1], but I have trouble getting the arrows to be drawn in DrRacket
for language "built-ins".
A boiled down version of the language file
I made a copy-paste mistake, the replacement for the last line of "MyLang.rkt"
should use "body2" instead of "body":
#'(#%plain-module-begin (module nm lng (#%plain-module-begin . body2)))
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Le dimanche 4 décembre 2016 04:18:44 UTC+1, Robby Findler a écrit :
> The fully expanded form of the original program doesn't have a require
> that brings in displayln?
Indeed, if I use (#%require lng) the arrows get drawn.
However, the body can require libraries which shadow some of the
languag
I think I found a solution which allows me to inject the (#%require lng)
without causing conflicts with other required module: applying an extra scope
to the whole body makes the other (require) forms more specific, and they can
shadow bindings imported by (#%require lng).
Here is the modified
Hello!
This is a follow-up to the excellent answer by Alex Knauth on StackOverflow
here: http://stackoverflow.com/a/38032107/324969 and this mailing-list thread:
https://groups.google.com/forum/#!topic/racket-users/sS-pUUGp9o4
I'm trying to write a module meta-language mylang, which accepts a s
Thanks Matthew!
Your solution seems to work fine, the trampoline idea is a very neat trick. I
like how it's safe to use require and begin because the continue macro returns
fully-expanded syntax which won't be affected by the code injected around (for
some reason I thought it was necessary to o
Le jeudi 15 décembre 2016 00:48:13 UTC+1, Alexis King a écrit :
> without much issue, modulo an issue I asked about on this mailing
> list a month or two back
Here's (what I suspect is) the thread Alexis mentions, for those who feel
curious: https://groups.google.com/forum/#!topic/racket-users/TG
Hi all!
I tried adding a "version exception" earlier, which partially failed (rendering
that package unusable on version in question, with the error "cannot use empty
checksum for Git repostory package source").
As a last ressort, I tried removing the package and re-adding it, but now
although
Actually, it seems I simply can't add any new package (neither
pkgn.racket-lang.org nor from pkgs.racket-lang.org).
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Greg, maybe you could push a commit to travis-racket, changing the URL to the
currently-working one, and revert that after the maintenance?
That way the repos which fetch travis-racket on the fly would still build while
mirror.racket-lang.org is down.
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One small point: I think it was good in the old site to have a link to the
documentation right at the top, where now there are just "Packages" and
"Download". We have great documentation (with a great design, thanks to
Matthew!), better put it forward :)
> 2. Greyed out code snippets - I am not
Le mercredi 28 décembre 2016 07:00:24 UTC+1, Matthew Butterick a écrit :
> If someone knows offhand where the main Scribble HTML template lives in
> `racket/scribble`, that would save me some time discovering it.
https://github.com/racket/scribble/blob/master/scribble-lib/scribble/html-render.rkt
Good catch!
I looked this up a bit, unfortunately it seems that there is no reliable way to
detect when the browser's search feature is started, let alone know where the
results are and which one is currently highlighted.
None of the options available is entirely satisfactory:
* Use JavaScript
Hi all!
TL;DR: if you're struggling when debugging scopes, I wrote a couple of
utilities to help: (+scopes stx) shows the scopes in a readable manner,
(print-full-scopes) gives a summary of these scopes, and (make-named-scope
string-or-symbol) creates a fresh scope annotat
I don't think the old "minor" versions are kept, only the last few as Stephen
pointed out.
As can be checked in the git log for
https://github.com/racket/racket/blame/master/pkgs/base/info.rkt, the version
number was bumped away from 6.7.0.3 in commit d7b18e7, so you could try
checking out the
Hi Dan,
Try with this:
main.rkt:
#lang racket
(require racket/stxparam "macro.rkt" "param.rkt")
(syntax-parameterize ([dirs 123])
(mymacro))
macro.rkt:
#lang racket
(require racket/stxparam "param.rkt")
(provide mymacro)
(define-syntax (mymacro stx)
#`(printf "dirs was ~a\n" #,(syntax-para
Le vendredi 20 janvier 2017 19:47:11 UTC+1, David K. Storrs a écrit :
> I see that I can get the event telling me that something changed. As
> far as I can tell the event contains no information about *what*
> changed, it simply alerts that *something* changed. Likewise, the
> monitor is only for
I was going to suggest `dynamic-require-for-syntax`, but it seems to do exactly
the same thing as `dynamic-require`, i.e. give the value of a phase-0 provided
identifier. Is this normal?
The `eval` trick is a good idea, I would say. From the couple of times I have
used dynamic-require, I have f
Le lundi 30 janvier 2017 22:13:57 UTC+1, Matthew Butterick a écrit :
> Recently we added a Racket logo to the upper right of the public doc pages.
> We could do something where this logo changed depending on whether the
> package belonged to core or community or whatever. Then we wouldn't need to
Le lundi 30 janvier 2017 06:25:29 UTC+1, Matias Eyzaguirre a écrit :
> Nice, thanks! I wasn’t aware of that. so macros are expanded in the order
> that the reader reads them, not in so called evaluation order.
>From experience, the order is outside-in, each form after the preceding one
>(except
PS: a nice example to try in the macro stepper, to see the evaluation order:
#lang racket
(define-syntax (foo stx) #'1)
(define-syntax (bar stx) #'foo)
(let ()
bar
(let ()
bar
(let ()
bar
bar)
(#%expression bar)
bar)
(+ bar bar)
bar)
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You received this mess
Le vendredi 3 février 2017 10:56:10 UTC+1, Laurent Orseau a écrit :
> Btw, with "Macro Hiding: Disabled" we can see that after foo is turned into
> #'1 (printed '1' in the macro stepper), then the 1 is 'tagged' with (#%datum
> . 1) and then right after that turned into (quote 1). Is the tagging s
Le vendredi 3 février 2017 11:28:47 UTC+1, Laurent Orseau a écrit :
> I see. So basically all #% things are extension points?
> The list for the racket language:
>
> http://docs.racket-lang.org/search/index.html?q=%23%25%20L%3Aracket
I think #% just means "low-level".
* #%declare, #%expression,
Hi Neil,
I'm starting a new thread to avoid hijacking the "Package layout in docs"
thread.
Le mardi 31 janvier 2017 20:25:31 UTC+1, Neil Van Dyke a écrit :
> Greg Trzeciak wrote on 01/31/2017 01:24 PM:
> > Speaking of packages - there seems to be a trend recently in racket
> > packages to creat
> (prefix 6 5 4) raises the same error as before, and the definition of
> prefix/parse complains "syntax-parse: duplicate attribute in: tail".
This is because ~or behaves differently under ellipses, and nested ~or are just
inlined. Your code for prefix/parse is therefore equivalent to (~or alt1
Le lundi 27 mars 2017 22:36:43 UTC+2, jos.koot a écrit :
> When I use #:grammar in a defform,
> the rules of the grammer are separated by empty lines.
>
> I would like to avoid these empty lines.
> Is it possible?
I haven't seen a built-in mechanism to control this. Generally speaking, the
tools
I hope that there's a better way, however what I ended up doing was this:
1) Install a "Minimal Racket" from
http://download.racket-lang.org/releases/6.8/ (scroll down a bit to see these
versions).
2) cd path/to/my-clone-of-plot/; raco pkg install
3) raco pkg install main-distribution
If you
As you say, it works with "#lang algol60", but I can't find "Algol60" in the
language selection dialog on DrRacket 6.9.0.1, only R5RS, "Pretty big Scheme"
and "ProfessorJ" (which I installed manually).
Which version are you using? Which version were you using when it used to
work?This may help
I thought raco pkg update was unable to turn a catalog-package into a
locally-installed package, but I might have tried it at the time
within the directory itself, instead of cd-ing one level up like you
said.
Thanks for the tip!
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Hi all!
Some of my libraries take a while to load: just adding a (require mylib) to an
empty #lang racket/base file bumps the compile time from 0.5s to 1.5s, even if
no bindings from the library are used. After experimenting a bit, it seems that
the overhead is mainly due to other modules which
Hi,
This sounds like a nice enhancement.
You might want to request this at https://github.com/racket/scribble/issues .
Aside from the implementation difficulty (the code for defform and friends is
large, handles many edge cases, and feels a bit like spaghetti code), one of
the main concerns wo
Thank you Matthew for the explanation.
If I understand correctly,
* Alex Harsanyi's start-up time is due to run-time (phase 0) initialisation
code in the required libraries, including things like (define v
costly-expression), which look like they could be saved as constants, but
actually invol
> > * Alex Harsanyi's start-up time is due to run-time (phase 0) initialisation
> > code in the required libraries, including things like (define v
> > costly-expression), which look like they could be saved as constants, but
> > actually involve running the expression.
>
> I actively try to av
Le jeudi 4 mai 2017 03:00:10 UTC+2, Daniel Prager a écrit :
> On the subject of turning down contracts for performance and then being
> bitten, believe me, I hear you: my preference is to have the maximum checking
> I can afford. But when I'm really writing stringent post-conditions (or
> invari
Le vendredi 5 mai 2017 02:30:50 UTC+2, Ben Greenman a écrit :
> With a `define/contract-out` macro?
>
> But I'd rather not have a macro like this in the contract library.
> I prefer reading code with all the "provide" statements at the top of the
> file.
Since provide transformers are executed i
Le vendredi 5 mai 2017 15:24:40 UTC+2, Matthias Felleisen a écrit :
> See
> https://docs.racket-lang.org/style/Units_of_Code.html#%28part._.Modules_and_their_.Interfaces%29
That's a very interesting document, thanks for the reference. Would you suggest
that, in this spirit, types for functions a
Le vendredi 5 mai 2017 16:36:49 UTC+2, Matthias Felleisen a écrit :
> I think that developers should write contracts and use them during testing
> and deployment in the same way. I did this decades ago for embedded realtime
> software and we’d be all better off if we did so.
I agree that I alwa
Le vendredi 5 mai 2017 19:10:12 UTC+2, Matthias Felleisen a écrit :
> > 1. (define/contract (foo input) (-> blah (listof integer?)) …)
> >
> > This has a O(n²) cost.
>
> I assume input is also a list. Then Racket’s define/contract is NOT O(n²)
> because the recursion of foo is considered INSIDE
Le samedi 6 mai 2017 23:38:29 UTC+2, Daniel Prager a écrit :
> Although I understand why my macro does this
>
> unsafe-factorial: contract violation
> ...
> blaming: (function fn/impl)
> ...
> at: unsaved-editor:13.15
>
>
> Ideally I would prefer one which blames unsafe-factorial
>
> unsafe-fac
Le dimanche 7 mai 2017 00:27:36 UTC+2, Daniel Prager a écrit :
> Thanks Georges
>
> It looks suggestive, but I'm struggling to follow the details of
> with-contract / blame-id. An example of use would be very helpful in the docs!
This gives "blaming: (region unsafe-factorial)" instead of "blamin
Le dimanche 7 mai 2017 07:27:08 UTC+2, Daniel Prager a écrit :
> 1. Default argument goes missing from post-condition, leading to an
> unexpected error ...
You should use unsupplied-arg? . But I couldn't find a way to get the default
value from the contract. I would guess that the problem is that
Le dimanche 7 mai 2017 23:14:17 UTC+2, Daniel Prager a écrit :
> Thanks for the explanation on 2. Pragmatically, it's just another contributor
> to the cost of contract checking.
I suppose you meant point 3, instead of point 2? The thread I linked to
indicates that with ->d, the double-checking
Generally it is nice to get the actual section title printed when using
@secref["mysection"]. However, in some cases it is a bit awkwards:
Chapter State of the art presents related work. Chapter Implementation explains
in detail how this library is implemented. etc.
I'd rather have something as
Le mardi 13 juin 2017 23:49:23 UTC+2, Alex Knauth a écrit :
> I'm imagining the existing DrRacket indentation rules would be expressed as:
>
> […]
This seems like a nice concise notation, although it is a bit cryptic at first
sight :) .
I'm not quite sure if if covers the following case (where
Thanks a lot!
I was able to build an @sec-number-ref function. Here it is below. Matthew,
since this is not a copy-paste of your code, I hope you won't see any problems
if I place this in the public domain / CC0 license?
@(define (sec-number→string tag #:doc [doc #f])
(delayed-element
(λ
My apologies, the code I just posted was missing a `reverse`. Here's the fixed
version:
@(define (sec-number→string tag #:doc [doc #f])
(delayed-element
(λ (the-renderer the-part the-resolve-info)
(define sec-tag (make-section-tag tag #:doc doc))
(define resolved-sec-tag (resol
Scribble has a low-level mechanisms for handling “numberers”, which aim to
solve the the same problem as LaTeX's counters.
http://docs.racket-lang.org/scribble/core.html#%28tech._numberer%29
Alternatively, MathJax natively supports numbering equations:
http://docs.mathjax.org/en/latest/tex.html
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