Although the `#lang` mechanism doesn't have a built-in mechanism for
options, a particular language can support them. For example, you might
define `pollen` so that
#lang pollen [char]
sets the command character when [char] appears after `pollen` and
exactly one space.
The `scribble/sigplan` la
Somewhat relatedly, have you ever considered making it possible for #lang
languages to expose configuration parameters in the #lang line?
For instance, at-expressions can be marked with any unicode character. To use
this functionality, however, one needs to set up a baby #lang that uses
make-at
At Fri, 15 Nov 2013 23:03:21 +0100, Jens Axel Søgaard wrote:
> Anyways, since pict-height didn't return the correct height, I tried:
> (send (dc-for-text-size) get-text-extent "√" font))
> but I am not able to make sense of the results. For most fonts
> I get a height of 30, but others give the
At Sat, 16 Nov 2013 12:44:03 -0500, Norman Ramsey wrote:
> On their next assignment, my students will reuse code they have
> built for binary search trees. I would prefer that they place the
> old code in a different source file than the new code. I tried
> doing this using "require", but I canno
Back when we introduced `#lang racket`, we could have included
@-notation by default, but I think we were focused on making `#lang
racket` a small shift from `#lang scheme`. And `#lang scheme` was too
long ago.
Backward compatibility rules out adding @-notation to `#lang racket`,
but I agree that
At Sat, 16 Nov 2013 22:16:40 +0100, Jens Axel Søgaard wrote:
> Welcome to DrRacket, version 5.90.0.10--2013-11-10(53c6658e/d) [3m].
> Language: racket/gui.
> . . ffi-lib: couldn't open "librsvg-2.2.dylib"
> (dlopen(librsvg-2.2.dylib, 6): Library not loaded:
> /opt/local/lib/libcairo.2.dylib
> Ref
> > [Are ISL structures made with define-struct serializable?]
>
> Kind of. If this is about Universe programming (so that students can send
> messages back and forth), I have them write conversion functions:
>
> (define-struct hh (cakes henries))
>
> (define (hh->lists hh)
>(list
Hi All,
I spent the day trying to get Asumu's bindings to librsvg
(a library that renders svg-files via Cairo) to run on OS X.
The problem seems to be the same that made me give
up getting libpoppler to work on OS X, so I was willing to
use some time on it.
The library works on Linux, but it cra
I wrote:
> How might I get the color to change not just when the user selects
> (mouse-ups), but also as a kind of live preview?
>
Greg replied:
> The underlying choice% control doesn't appear to expose a "hover" event,
so I don't think there's any way to get what
> you're describing, even in raw
On Fri, Nov 15, 2013 at 3:14 PM, Daniel Prager wrote:
> My current (learning) scenario is to slap a simple GUI onto a specialised
> image editor that I have been working on.
>
> At the moment it feels like the way to learn FrTime is by reading and
> adapting the examples and diving into the source
I agree. Having the students write the marshalling and unmarshalling
functions is important when introducing them to DP. It also a great way to
demonstrate the importance inverse functions. Take a look at some of my
thoughts here:
http://faculty.cs.byu.edu/~jay/conferences/2013-tfp/proceedings/tfp2
I have considered making them prefab instead
Sent from my iPhone
> On Nov 16, 2013, at 12:32 PM, Jay McCarthy wrote:
>
> I think the conversion function is useful pedagogically to talk about
> the need to serialize, but having it just work might be expedient in
> other situations. I do not be
On their next assignment, my students will reuse code they have
built for binary search trees. I would prefer that they place the
old code in a different source file than the new code. I tried
doing this using "require", but I cannot figure out how to get
"require" to load a file that is written
I think the conversion function is useful pedagogically to talk about
the need to serialize, but having it just work might be expedient in
other situations. I do not believe that they are actually
serializable, but we could fairly easily make that change.
On Sat, Nov 16, 2013 at 10:22 AM, Matthias
Kind of. If this is about Universe programming (so that students can send
messages back and forth), I have them write conversion functions:
(define-struct hh (cakes henries))
(define (hh->lists hh)
(list (cakes->lists (hh-cakes hh)) (henries->lists (hh-henries hh
-- Matthias
On N
A structure is defined with `define-struct` in Intermediate Student Language.
Is it serializable? That is, can it be written and then re-read
successfully with `write` and `read`? If not, is there a way to make it so?
(I have found the function `make-serialize-info` in the racket/serialize
libra
It's a reasonable suggestion. I've updated the design so that all the internal
cross-references share the same color.
http://mbutterick.github.io/racket-doc-redo/doc/
On Nov 15, 2013, at 7:25 AM, Neil Toronto wrote:
> On 11/13/2013 11:33 PM, David T. Pierson wrote:
>> On Wed, Nov 13, 2013
On 11/16/2013 08:57 AM, Anthony Carrico wrote:
> 6. Here is an example from my unit tests. It is a delay line:
Oops, I forgot to show you the output:
$ raco test main.rkt
raco test: (submod "main.rkt" test)
::: (1 0 0 1)
::: (3 0 1 2)
::: (6 1 2 3)
::: (9 2 3 4)
12 tests passed
--
Anthony Carr
On 11/12/2013 03:21 PM, Daniel Prager wrote:
> Given the existence of FrTime, whalesong, and FlapJax is anyone
> working on or considering doing an elm-like language
> (http://elm-lang.org/) for Racket?
I've taken a look at FrTime, FlapJax, and Elm. I agree that it is all a
good idea. It appeals t
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