It is not possible, unfortunately. You must do the conversion to and
from strings yourself.
I've thought about adding a hook for additional conversions based on
declared types, but there's no declared type information at all for
parameters, and the declared type for results is fragile: a
At Tue, 23 Apr 2019 23:39:04 +0200, Ryan Culpepper wrote:
> It looks like natipkg Racket includes libharfbuzz.so.0, not
> libharfbuzz.so.1 (see [1]). So try changing the unix line to
>
> [(unix) (ffi-lib "libharfbuzz" '("0" ""))]
>
> instead.
Right.
Just to elaborate a little, there is
On 4/23/19 23:14, Matthew Butterick wrote:
Some code relies on the `harfbuzz` library, like so:
(define-runtime-lib harfbuzz-lib
[(unix) (ffi-lib "libharfbuzz" '("1" ""))]
[(macosx) (ffi-lib "libharfbuzz.0.dylib")]
[(windows) (ffi-lib "libharfbuzz-0.dll")])
Though this works on my
Some code relies on the `harfbuzz` library, like so:
(define-runtime-lib harfbuzz-lib
[(unix) (ffi-lib "libharfbuzz" '("1" ""))]
[(macosx) (ffi-lib "libharfbuzz.0.dylib")]
[(windows) (ffi-lib "libharfbuzz-0.dll")])
Though this works on my Mac machines, the doc server throws an error: [1]
On Tuesday, 23 April 2019 15:57:52 UTC+1, Matthew Flatt wrote:
>
> This response will be rambling, too. :)
And here I thought I asked an embarrassingly silly question :)
While implementing a "naive" version I ran into two issues that I kind of
predicted upfront, but just wanted to make sure
"orenpa11" , 23.04.2019, 20:53:
> Hi
> I am using the functionprintBoard board (DrRacket Pretty Big)
>
> (printBoard '((0 0 2 0) (0 0 0 0) (0 0 8 0) (0 0 0 0)))
> and the result is
>
> (0 0 2 0)
> (0 0 0 0)
> (0 0 8 0)
> (0 0 0 0)
> ""
No, it is not. The *print output* is
(0 0 2 0)
Thanks
On Tuesday, April 23, 2019 at 9:59:35 PM UTC+3, Dexter Lagan wrote:
>
> Hi there!
>
> You can suppress à function’s output with (void (func ...)) like so:
>
> (void (printBoard '((0 0 2 0) (0 0 0 0) (0 0 8 0) (0 0 0 0
>
> Or you can modify your original function and replace the “”
Hi there!
You can suppress à function’s output with (void (func ...)) like so:
(void (printBoard '((0 0 2 0) (0 0 0 0) (0 0 8 0) (0 0 0 0
Or you can modify your original function and replace the “” by (void) like so:
...
(cond ((empty? board) (void) )
...
Dexter
> On Apr 23, 2019, at
Hi
I am using the functionprintBoard board (DrRacket Pretty Big)
(printBoard '((0 0 2 0) (0 0 0 0) (0 0 8 0) (0 0 0 0)))
and the result is
(0 0 2 0)
(0 0 0 0)
(0 0 8 0)
(0 0 0 0)
""
How do I delete the "" ?
I would like the output to be
(0 0 2 0)
(0 0 0 0)
(0 0 8 0)
(0 0 0 0)
tl;dr I'm having trouble getting JSON support working in the db module
when using SQLite and would really appreciate some direction, or
confirmation that it's impossible. I suspect that it's impossible, since
the docs list the accepted Racket types as exact-integer?, real?, string?,
and bytes?.
I find this email fascinating, as about three weeks ago, Spencer Florence and I
discussed something almost identical, from the module path + symbol protocol
all the way down to the trouble with `quote`. I had been intending to
experiment with implementing the idea at some point, but I already
On Tue, Apr 16, 2019 at 04:55:49PM -0400, Hendrik Boom wrote:
On Tue, Apr 16, 2019 at 10:13:47PM +0200, Jens Axel Søgaard wrote:
Hav you tried the make library?
https://docs.racket-lang.org/make/index.html?q=make
If you like Racket's make library but want something a little more
shell-like,
This response will be rambling, too. :)
Especially with your follow-up message, I think you're getting to a
problem that we've wrestled with for a while. Sometimes we've called it
the "graphical syntax" problem, because it's related to having non-text
syntax, such as images in DrRacket (which are
On Tue, Apr 23, 2019 at 4:33 AM Ryan Culpepper wrote:
> On 4/22/19 20:36, David Storrs wrote:
> > > (require db)
> > > (define db (postgresql-connect ...args...))
> > > (simple-result-info (query db "insert into collaborations (name)
> > values ('foojalskdsfls')"))
> > '((insert-id . #f)
On 4/23/2019 4:32 AM, Ryan Culpepper wrote:
On PostgreSQL, my guess is that your table was created without the
"WITH OIDS" clause. For example:
> (define c (dsn-connect 'pg))
> (query c "create table words (t text)")
(simple-result '())
> (query c "insert into words (t) values
Yes, a global table of all existing keywords are needed.
I would do something along the lines of:
#lang racket
(struct Keyword (string))
(define global-keyword-hash (make-hash))
; keyword : string -> keyword
(define (keyword s)
(define k (hash-ref global-keyword-hash s #f))
(or k
(let
One thought that only just occurred to me is that we certainly want to
allow creating kws dynamically, so a piece of code may generate some. IIUC
this means it can no longer be a purely reader-based feature. Either reader
and runtime have to communicate the global table somehow or the entire
I must apologies for what follows will be more of a rambling than an
exercise in clear thinking. That is because I am a bit stuck and thought
I'd seek help.
I have been thinking some about languages and how it isn't always easy to
clearly separate language being implemented from the language
I must apologies for what follows will be more of a rambling than an
exercise in clear thinking. That is because I am a bit stuck and thought
I'd seek help.
I have been thinking some about languages and how it isn't always easy to
clearly separate language being implemented from the language
The coimputational power of Racket’s syntax transformation system is equivalent
to that of Turing machines. [[ The expressive power is a bit limited and we’re
working on expanding it, but I don’r think you’re asking about this. ]] —
Matthias
> On Apr 23, 2019, at 7:29 AM, Ilnar
Hi
I found that you can run DrRacket on rollApp virtualisation platform[1].
Are there any other online IDE’s for Racket? I’m interested in both
in-browser repl/editor combinations or virtualised DrRacket.
Stephen
[1] rollApp DrRacket free version does not permit saving. Signup required.
Hi all!
I was glancing over these books [1] and [2] on tree automata.
I assume that Racket's macro system / syntax transformations fall under
the category of tree transducers.
Can anybody please point me to a paper which describes its expressive
power in formal terms, if any?
The reason I
Thanks for exploring this!
I was tempted down this path earlier this year because I was trying to
future-proof my structure type definitions by making them cross-phase
persistent. I see no innate reason for them not to be, so I figured I'd put
in the effort early and avoid having to make a
On 4/22/19 20:36, David Storrs wrote:
> (require db)
> (define db (postgresql-connect ...args...))
> (simple-result-info (query db "insert into collaborations (name)
values ('foojalskdsfls')"))
'((insert-id . #f) (affected-rows . 1))
From the docs on the 'simple-result' struct:
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