OK, I get it now. subtract-in does exactly what I want. Thanks,
Mark
Racket Users list:
http://lists.racket-lang.org/users
Cool. Have you tried putting these in PLaneT yet, so people can find
and easily use them in the future?
(Putting a package into PLaneT is easier with McFly Tools, if that
helps. "http://www.neilvandyke.org/mcfly-tools/";)
Neil V.
Racket Users list:
http://lists.racke
Matthias Felleisen wrote:
>
>I can't think of another way. But I am also wondering why you'd want to
>run a program written in language L in language K. -- Matthias
Mostly I just wondered how easy it would be to do it. (Certainly the toy
examples I made were things one could doubtless impleme
Hello all,
Is there a package out there wherein a user can specify a syntax
transformer, and the macro expansions are used to replace invocations of
the syntax transformer in the source syntax, within the source file itself.
I guess I'm envisioning a sort of syntax aware find and replace.
Thanks,
Hello Racketeers,
I'm just introducing myself to the list. I've written a few projects in
Racket over the last few years and just lately decided to post them on
GitHub.
https://github.com/edwardlblake/
There's a (unfinished) IRC client app with a internal routing system (I'm
intending to have a
An hour ago, Matthias Felleisen wrote:
> I can't think of another way. But I am also wondering why you'd want
> to run a program written in language L in language K. -- Matthias
I had that at some point for code that would either get treated as
plain racket or as code in lazy racket. (With the ob
I can't think of another way. But I am also wondering why you'd want to run a
program written in language L in language K. -- Matthias
p.s. To think of
(define (hi person) ...)
as a program is wrong. You should look at the file proper where you will see
the extra lines that your reader acc
On Thu, Nov 1, 2012 at 4:56 PM, John Clements
wrote:
> I can't tell whether this is a bug. In the program below,
remove-duplicates doesn't remove duplicates. This looks like an attempt to
preserve parametricity a la theorems for free, but I don't think that TR
actually tries to guarantee parametri
Looking at some of the recent tutorials on building and using languages in
Racket, I was prompted to wonder what I'd have to do in order to take an
existing module (in its own file) and evaluate it with a language other
than the one it is specified to use, without modifying the module's
original so
Thank you, thank you, thank you.
[This validates that my objection to our parametricity is real.]
On Nov 1, 2012, at 4:56 PM, John Clements wrote:
> I can't tell whether this is a bug. In the program below, remove-duplicates
> doesn't remove duplicates. This looks like an attempt to preser
Matthew Flatt wrote:
> A monocrhome bitmap doesn't have an alpha channel, but it you ask for
> its pixels in `just-alpha?' mode, then while pixels generate a 0 alpha
> and black pixels generate a 255 alpha.
>
Thanks Matthew. What confused me was that for:
(send a-dc set-alpha opacity)
opacity i
Interestingly
(require/typed racket
[remove-duplicates ((Listof Any) -> (Listof Any)))])
works.
On Thu, Nov 1, 2012 at 4:56 PM, John Clements wrote:
> I can't tell whether this is a bug. In the program below,
> remove-duplicates doesn't remove duplicates. This looks like an att
I can't tell whether this is a bug. In the program below, remove-duplicates
doesn't remove duplicates. This looks like an attempt to preserve parametricity
a la theorems for free, but I don't think that TR actually tries to guarantee
parametricity in this sense. I'm guessing that the values in
I'm having similar issues on Debian squeeze and wheezy and Ubuntu
12.04.
Vincent
At Thu, 1 Nov 2012 16:32:30 -0400,
Ray Racine wrote:
>
> [1 ]
> [1.1 ]
> When editing racket code in DR the right-click menu is very fragile on
> Linux (Ubuntu 12.10). Upon right-clicking the menu pops up, but m
When editing racket code in DR the right-click menu is very fragile on
Linux (Ubuntu 12.10). Upon right-clicking the menu pops up, but more often
then not quite promptly vanishes. I can't pin down a repeatable set of
conditions.
Sometimes I can't get it to stay open at all, other times if I righ
Thank you, Neil T., for making such an awesome library.
David
Racket Users list:
http://lists.racket-lang.org/users
Why not important the SRFI library with a prefix?
Sent from my iPhone
On Nov 1, 2012, at 11:43 AM, Mark Engelberg wrote:
> Thanks. Is there a simple way to do it without itemizing the specific
> function names?
>
> I was caught off guard because I was using the new string-trim function.
>
One potential issue is that the Racket and SRFI functions may take different
arguments or have different semantics.
Sent from my iPhone
On Nov 1, 2012, at 11:43 AM, Mark Engelberg wrote:
> Thanks. Is there a simple way to do it without itemizing the specific
> function names?
__
You don't have to itemize any names. Just put the name after the #lang
line. I assume that's racket, but it might be racket/base. You don't need
to list anything else you include, require will already report an error if
those clash.
Carl Eastlund
On Thu, Nov 1, 2012 at 2:45 PM, Mark Engelberg
On Thu, Nov 1, 2012 at 2:46 PM, Matthias Felleisen wrote:
>
> Since S0 is a function from T :: Type to some Union and TR doesn't allow
> this, you want to signal a syntax error here. Correct?
No, this program is fine from a typed perspective. The only problem
is in contract generation, which lo
A few minutes ago, Mark Engelberg wrote:
> Thanks. Is there a simple way to do it without itemizing the
> specific function names?
The two things in the form are two require specs, and you get
everything from the first that is not provided by the second -- you
don't need to list any names.
--
Since S0 is a function from T :: Type to some Union and TR doesn't allow this,
you want to signal a syntax error here. Correct?
On Nov 1, 2012, at 12:16 PM, Sam Tobin-Hochstadt wrote:
> On Thu, Nov 1, 2012 at 12:07 PM, Ray Racine wrote:
>> Fresh build from Racket git MASTER, the following ca
What Eli linked should do that, just write:
(require (subtract-in srfi/13 racket))
That should require everything that's in srfi/13, except for names that are
already in racket.
Carl Eastlund
On Thu, Nov 1, 2012 at 2:43 PM, Mark Engelberg wrote:
> Thanks. Is there a simple way to do it witho
My point being that I'm worried if I have to itemize all the names, I might
miss a potential conflict.
On Thu, Nov 1, 2012 at 11:43 AM, Mark Engelberg wrote:
> Thanks. Is there a simple way to do it without itemizing the specific
> function names?
>
> I was caught off guard because I was using t
Thanks. Is there a simple way to do it without itemizing the specific
function names?
I was caught off guard because I was using the new string-trim function.
When I included srfi/13, I didn't realize it was going to replace
string-trim with a version that was really just a "trim left" function.
http://docs.racket-lang.org/reference/require.html#(form._((lib._racket/require..rkt)._subtract-in))
20 minutes ago, Mark Engelberg wrote:
> Is there an easy way to require everything in a given SRFI, while
> specifying that in a case of name conflict, I want to use the
> built-in racket version?
Is there an easy way to require everything in a given SRFI, while
specifying that in a case of name conflict, I want to use the built-in
racket version?
I'm specifically thinking about srfi/13, the string library. I want to
include that, but I think Racket's newly added string functions (such as
>
> Another possible workaround for now would be to cast the field to a
> varchar and call string->number on the result.
>
numeric is an exact datatype in SQL Server; you'd also want to compose
inexact->exact with string->number to preserve exactness (if that's a concern)
i.e (inexact->exact
Thanks,
I did catch that, was just pointing out the non-termination. The original
source file was much larger and it took awhile to pare it down to the root
cause. Definitely a non-showstopper issue however.
On Thu, Nov 1, 2012 at 12:16 PM, Sam Tobin-Hochstadt wrote:
> On Thu, Nov 1, 2012 at
On Thu, Nov 1, 2012 at 12:07 PM, Ray Racine wrote:
> Fresh build from Racket git MASTER, the following causes DRRacket's Check
> Syntax to loop without termination.
Clearly, this isn't the behavior you want, but I don't think a
contract is possible to generate for this code.
If you change the ty
Fresh build from Racket git MASTER, the following causes DRRacket's Check
Syntax to loop without termination.
#lang typed/racket/base
(provide f)
(struct: (T) S1 ([x : (Listof String)]))
(struct: (T) S2 ([x : S0]
[g : (T -> Boolean)]))
(define-type (S0 T) (U (S1 T) (S2 T)))
(
At Wed, 31 Oct 2012 23:06:39 -0400, Harry Spier wrote:
> Dear list members,
>
> I see from the Racket Drawing Toolkit documentation that there are
> monochrome bitmaps but I'm not clear from the documentation how to
> access and manipulate these monochrome bitmaps.
>
> Specifically:
> 1) If I loa
Thank you, Ryan! The cast as numeric(10,4) did not work, but the cast to
varchar worked fine, and that's good enough for me for now. I have no idea why
this field is sized so big, but this is not the first puzzling thing I've seen
in this database. Let me know if there is anything else I do to h
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