Use `convert-syntax-error` from the `syntax/macro-testing` module:
http://docs.racket-lang.org/syntax/macro-testing.html#(form._((lib._syntax%2Fmacro-testing..rkt)._convert-syntax-error))
Ryan
On 06/30/2017 04:47 PM, Sam Waxman wrote:
Hello,
I'm trying to test whether or not certain
On 5/3/17 10:41 PM, Eric Griffis wrote:
Hello,
I'm having trouble catching "terminate break" exceptions when combining
break-thread with thread-wait.
MWE 1:
(with-handlers ([exn:break:terminate? writeln])
(let ([t (thread (lambda () (thread-wait (current-thread])
You might be interested in `dsn-connect` and the `data-source` structure
(http://docs.racket-lang.org/db/connect.html#%28part._.Data_.Source_.Names%29).
Ryan
On 4/25/17 8:18 PM, David Storrs wrote:
Great. Thanks, Phillip!
On Tue, Apr 25, 2017 at 2:14 PM, Philip McGrath
On 03/31/2017 04:00 PM, David Storrs wrote:
Imagine I have the following trivial module (ignore that things are
defined out of sequence for clarity):
#lang racket
(define (foo arg)
(_baz arg) ; do some checking, raise an exception if there's a problem
...do stuff...
)
(define (bar
On 3/15/17 12:41 AM, George Neuner wrote:
Hi Ryan,
Hope you enjoyed the snow day. Lost power here for a while, but
fortunately no damage.
I did :) My neighborhood didn't get much snow by volume, but what it did
get was then rained/sleeted nearly into ice.
On 3/13/2017 11:09 PM, Ryan
On 03/13/2017 06:30 PM, George Neuner wrote:
Hi Ryan,
On 3/13/2017 5:43 PM, Ryan Culpepper wrote:
Racket's db library always prepares a statement before executing it,
even if there are no query parameters. When allowed, instead of
closing the prepared statement immediately after executing
On 03/13/2017 04:56 PM, George Neuner wrote:
On 3/13/2017 3:41 PM, David Storrs wrote:
On Mon, Mar 13, 2017 at 2:04 PM, Ryan Culpepper <ry...@ccs.neu.edu
<mailto:ry...@ccs.neu.edu>> wrote:
If you are using `prepare` just for speed, it might help to know that
most base conn
On 03/13/2017 03:16 PM, David Storrs wrote:
[...]
On Mon, Mar 13, 2017 at 2:49 PM, George Neuner > wrote:
- It's also fine to pass the VC into other threads. It will be
shared state between the threads, but the CP will keep their
On 03/13/2017 12:49 PM, David Storrs wrote:
[...]
Assuming I've understood all that correctly, my last question would be
how to get around the 'can't do prepare with a virtual connection' issue
for situations where I've been passed a connection (perhaps from third
party code) and it might or
read-line returns eof when the port is closed, which is completely
different from sending byte 04 (or any other byte or sequence of bytes)
over the port.
;; set up {client,server}-{in,out} ports
(write-byte 4 client-out)
(flush-output client-out)
(read-byte server-in) ;; => 4
On 02/08/2017 04:41 PM, Dan Liebgold wrote:
Hi all -
I have an odd syntax I'm trying to maintain backward compatibility with, but
I'd like to take advantage of keyword parameters to accommodate the
presence/absence/ordering of those parameters.
Here's an example of what I'm trying to do:
On 12/03/2016 02:15 PM, Winston Weinert wrote:
I managed to resolve the alignment question with the following lines:
(define e (send my-text-field get-editor))
(send e auto-wrap #t)
(send e set-paragraph-alignment 0 'center)
However, I'm still at a loss how to make the text-field% read-only
We will be performing maintenance on one of the PLT servers Monday
afternoon. Some services will be unavailable during that time,
including PLaneT, mailing list archives, and the old bug database.
The main web pages, the package server, and the user and dev mailing
lists should be unaffected.
On 11/16/2016 08:24 PM, Dan Liebgold wrote:
FWIW, Eric Dobson wrote a very nice `define-literal-syntax-class` macro
that is used extensively inside TR.
https://github.com/racket/typed-racket/blob/master/typed-racket-lib/typed-racket/utils/literal-syntax-class.rkt
Hmm... I can't quite
On 11/16/2016 07:51 PM, Vincent St-Amour wrote:
FWIW, Eric Dobson wrote a very nice `define-literal-syntax-class` macro
that is used extensively inside TR.
https://github.com/racket/typed-racket/blob/master/typed-racket-lib/typed-racket/utils/literal-syntax-class.rkt
Its companion
On 11/16/2016 07:42 PM, Dan Liebgold wrote:
Literal sets can include datum-literals:
(define-literal-set lits #:datum-literals (a b c) (d e))
Ah, oops I missed that keyword parameter.
For question 1, that's probably the best way. If you want to suppress
the printing of all of the
On 11/16/2016 06:11 PM, Dan Liebgold wrote:
Hi,
A couple questions about literals in syntax-parse:
1. I'd like to make a syntax-class that is just a set of literals
(with a clear error for something not matching any literal). Is there
a better way than this:
http://pasterack.org/pastes/86722
On 11/08/2016 11:24 PM, George Neuner wrote:
[...]
- I need to turn the UTC datetimes on all the results back into local
times with the right time zone
Does the following do what you want?
(require srfi/19)
;; date-at-tz : Date Integer -> Date
;; Returns date of equivalent instant in
On 11/06/2016 09:42 PM, George Neuner wrote:
[...]
The following in Racket gets it wrong.
e.g.,
[...]
=>
#(struct:sql-timestamp 2016 5 1 5 0 0 0 0) -> "2016-05-01 05:00:00Z"
"2016-05-01 00:00:00-05" -> #(struct:sql-timestamp 2016 5 1 0 0 0 0
-18000)
#(struct:sql-timestamp 2016 6 12 5 0 0 0 0)
On 10/25/2016 08:04 PM, Alexis King wrote:
That makes sense; thank you for your quick reply. It might be
possible to do something like what you describe, but I do have a
little more context that makes this sort of tricky. I’m trying to
not just store identifiers but also store prefab structs
On 10/25/2016 06:16 PM, Dan Liebgold wrote:
On Tuesday, October 25, 2016 at 2:09:59 PM UTC-7, Ryan Culpepper wrote:
racket -e '(enter! "your-module.rkt")' -i
BTW, any luck putting a line like this in csh shell script, alias, or windows
batch file?
For scripting, if your in
On 10/25/2016 04:57 PM, Dan Liebgold wrote:
On Tuesday, October 25, 2016 at 1:43:28 PM UTC-7, Alexis King wrote:
bound...
You need to put the -i flag first, so the command should look like:
racket -iI -l
Hmm... that give the REPL the proper language but no access to the contents of
See `convert-compile-time-error` and `convert-syntax-error` from the
`syntax/macro-testing` library. I should fix the docs to say that the
type of the exception can change, so they work best for testing the
contents of the exception message.
For examples, there are tests for invalid uses of
On 10/24/2016 02:15 PM, Dan Liebgold wrote:
On Sunday, October 23, 2016 at 1:14:56 PM UTC-7, Ryan Culpepper wrote:
[...]
1. A term like `(a <- blend)` will match the first pattern and treat
`blend` as a `remap:id`. If you don't want that to happen, there are two
ways to prevent it.
On 10/21/2016 05:50 PM, Dan Liebgold wrote:
Hi all -
In the process of putting together a somewhat complex application
using syntax-parse, I discovered that when I specified a repeated
pattern in a syntax-class (which was incorrect) AND I had a certain
usage of the syntax transformer with an
Does one of the `string-normalize-*` functions do what you want?
Ryan
On 10/08/2016 01:06 PM, Jens Axel Søgaard wrote:
Hi All,
The following interaction shows how the reader can be used to construct
a surrogate character:
> (string-ref "\ud800\udc00" 0)
#\
Given the two
In PostgreSQL, clusters contain databases contain schemas.
I think the answer is to use "SET SCHEMA" or the more general "SET
search_path". See
https://www.postgresql.org/docs/current/static/ddl-schemas.html
https://www.postgresql.org/docs/current/static/sql-set.html
Ryan
On 10/06/2016
On 10/03/2016 06:38 PM, Jack Firth wrote:
So I'm reading a file in as code and expanding it, then looking for values in a
certain
syntax property that macros in the expanded code attach. This works fine for
prefab
structs, but I can't seem to get it to work with transparent structs. The issue
On 09/28/2016 02:33 PM, 'William J. Bowman' via Racket Users wrote:
I recently ran into a problem that took me hours to diagnose.
It turns out that a `#:with` clause in a syntax-parse was not matching, but I
would never have guessed
that from the error message I got.
Here is a simplified
On 9/28/16 12:04 PM, William J. Bowman wrote:
On Fri, Sep 23, 2016 at 02:58:23PM -0400, Ryan Culpepper wrote:
It appears that the constructor macro (implemented by self-ctor-transformer
in racket/private/define-struct.rkt) transfers the syntax properties from
the macro use to its expansion (see
On 09/23/2016 02:43 PM, 'William J. Bowman' via Racket Users wrote:
Under certain conditions, the value of a syntax property is duplicated.
I can't figure out why, or if this is a bug, and any advice would be
appreciated.
I've attached the smallest program that generates this behavior that
See `define-custom-hash-types` in `racket/dict`. Note that you'll need
to use `dict-ref` instead of `hash-ref`, etc.
Ryan
On 08/04/2016 12:34 PM, Jos Koot wrote:
Hi
As far as I can see a hash has three options only for the equivalence
relation comparing keys: eq?, eqv? and equal?.
Would it
On 07/22/2016 07:58 PM, David Storrs wrote:
Thanks Jon, I appreciate the clear explanation.
I'm using call-with-values in database code in order to turn a list into
an acceptable set of bind parameters. Here's an example:
(query-exec conn "insert into foo (bar, baz) values ($1, $2)"
It seems that a typed module needs to be as *protected* as TR itself,
but not as *powerful* (or privileged) as TR. Otherwise one could define
a malicious typed module that uses the power TR grants it to break
sandboxing. Is the combination of protected but not powerful possible in
the current
On 05/11/2016 03:16 AM, Tim Brown wrote:
I found this in the documentation for syntax-class (Link to this section
with
@secref["stxparse-attrs" #:doc '(lib "syntax/scribblings/syntax.scrbl")]):
Consider the following code:
(define-syntax-class quark
(pattern (a b ...)))
You might find this function helpful (from the implementation of in-query):
(define (in-list/vector->values vs)
(make-do-sequence
(lambda ()
(values (lambda (p) (vector->values (car p)))
cdr
vs
pair? #f #f
Ryan
On 05/04/2016 09:46 AM, Denis
Søgaard, John Clements, Leandro Facchinetti,
Lehi Toskin, Leif Andersen, Łukasz Dąbek, Marc Kaufmann, Matthew Flatt,
Matthias Felleisen, Michael McConville, Mike Sperber, Paul Stansifer,
Philippe Meunier, Robby Findler, Rodrigo Setti, Ryan Culpepper, Sam
Caldwell, Sam Tobin-Hochstadt, Sorawee
The problem was a use of (system-type 'machine) in racket/unix-socket.
I've pushed a fix.
Ryan
On 04/06/2016 08:06 AM, WarGrey Gyoudmon Ju wrote:
I met this problem before.
(system-type 'machine) uses the output of `uname`.
On Wed, Apr 6, 2016 at 5:47 PM, Tim Brown
On 03/24/2016 06:17 PM, Ty Coghlan wrote:
I have the following simple code:
(require db)
(define mdb (mysql-connect #:user user #:password password))
(query-exec mdb "use starwarsfinal")
(query mdb "CALL track_character(?)" "Chewbacca")
(disconnect mdb).
Where track_character is a procedure
I think it would be more (Racket-)idiomatic to make account a parameter
(as in make-parameter) and have something that can update the parameter
around a test case. Here is my preferred extension, by example:
(define account (make-parameter #f))
(define (call/open-bank proc)
(parameterize
On 02/17/2016 10:39 AM, Brian Adkins wrote:
On Wednesday, February 17, 2016 at 10:35:44 AM UTC-5, Brian Adkins wrote:
On Wednesday, February 17, 2016 at 10:20:21 AM UTC-5, Neil Van Dyke wrote:
Brian Adkins wrote on 02/17/2016 10:04 AM:
http://www.neilvandyke.org/racket-html-parsing/
takes me
On 02/12/2016 07:33 PM, Ty Coghlan wrote:
Both of you were correct, I had to flush my output and newline
terminate it. The final result looks like:
(define (broadcast source destination type message port)
(let ([h (hash 'source source 'dest destination
'type type 'message
On 02/14/2016 12:02 PM, Fred Martin wrote:
So... even though I chose "Other" as the client type, my API credentials were
created with a secret.
I had to copy the secret into my client constructor request.
From my reading of the oauth 2 API docs, I thought "installed app" clients
weren't
On 02/14/2016 11:07 PM, Nota Poin wrote:
I suppose I could do something like this:
(define-syntax (transform-post-expansion stx)
(syntax-case (expand stx) ()
(...)))
The macro should use `local-expand` rather than `expand`. See the docs
for `local-expand`, since it takes more
Unix socket ports are block-buffered, so after writing to them you need
to flush the output. Something like
(write-json data port)
(flush-output port)
Your code on github has calls to flush-output without the port argument.
That doesn't flush the unix socket port; it flushes the current
Racket version 6.4 is now available from
http://racket-lang.org/
- We fixed a security vulnerability in the web server. The existing
web server is vulnerable to a navigation attack if it is also
enabled to serve files statically; that is, any file readable by
the web server is
The openssl library uses scheme_register_process_global to make sure it
initializes the openssl foreign library only once. See the end of
openssl/mzssl.rkt.
Ryan
On 01/28/2016 02:33 PM, Leif Andersen wrote:
Since a lot of people were at POPL last week, I think it's worth
pinging this list
On 01/17/2016 06:35 PM, Alexis King wrote:
The DB docs for SQL type conversions[1] note that not all Postgres types
are supported by Racket, and it recommends using a cast to work around
this. It even uses the inet type as an example right at the start of the
page. However, I want to store an
Racket version 6.3 is now available from
http://racket-lang.org/
- Racket's macro expander uses a new representation of binding called
"set of scopes". The new binding model provides a simpler
explanation of how macros preserve binding, especially across module
boundaries and in
I think I've run into this problem before. The type of array-slice-ref is
(Array A) (Listof Slice-Spec) -> (Array A)
where Slice-Spec = (U (Sequenceof Integer) Integer )
The problem is that integers are also sequences, so the contract
generated for Slice-Spec just discards the Integer
On 09/29/2015 12:28 PM, Tim Roberts wrote:
I'm coming to Racket after many decades of programming in other
languages. One of the things that still gives me trouble is being able
to know exactly what type of "thing" I have at any given point.
Let me give you an example, which is actually quire
I think someone was working on listener code for unix sockets a year or
so ago, but I don't remember who or how far they got. Pull requests are
welcome.
Ryan
On 8/31/15 2:36 PM, qwe-te...@yandex.ru wrote:
Racket provides unix-socket-connect and lacks listener. Is it going
to be added in
Here's one more solution, using "template metafunctions" (inspired by
Redex's metafunctions). And yes, most of the point of template
metafunctions is to have something that cooperates with ellipses like
you want.
> (require syntax/parse
syntax/parse/experimental/template
On 08/22/2015 06:18 PM, George Neuner wrote:
On 8/22/2015 5:50 PM, Jon Zeppieri wrote:
On Sat, Aug 22, 2015 at 4:36 PM, George Neunergneun...@comcast.net wrote:
The latter code using date works properly (modulo the time zone field) and
gives consistent results, but the former using date*
Racket version 6.2.1 is now available from
http://racket-lang.org/
Version 6.2.1 patches the recent v6.2 release in three small ways:
* For the How to Design Programs teaching languages, DrRacket offers
an option to use the old style for printing the constants `true`,
`false`, and
On 07/06/2015 10:04 PM, Anthony Carrico wrote:
I've been working through Macros that Work Together (on my way to
working through Sets-of-Scopes). I've come across something that is
slightly unclear to me in the section on local-expand:
E ::= a mapping from name to transform
I don't believe
On 06/24/2015 07:46 AM, George Neuner wrote:
Hi Ryan,
On 6/23/2015 12:20 PM, Ryan Culpepper wrote:
Yes, that should be fine. One note about your sample code: the
isolation mode of inner transactions must be #f (the default); you
can't change isolation levels once you've started an outer
Yes, that should be fine. One note about your sample code: the isolation
mode of inner transactions must be #f (the default); you can't change
isolation levels once you've started an outer transaction. Also keep in
mind that nested transactions are not supported for ODBC connections.
Ryan
Racket version 6.2 is now available from
http://racket-lang.org/
With this release we are taking a major step forward to get our user
community even more involved than in the past. Over the past six months,
we have re-organized the Racket code base into a small core code repo
and many other
On 06/19/2015 03:07 PM, Thomas Dickerson wrote:
Hi All,
I'm trying to figure out how best to implement the following pattern of macro
behavior:
Let's say we are writing Loop macro that implements a looped computation over a
specified body. I would like to then be able to
(a) introduce
101 - 160 of 160 matches
Mail list logo