Re: [racket-users] How to set up rackunit tests to test the REPL?

This is one of the few (IMO) legitimate uses of `eval`. Your test suite should create a namespace, set it up by requiring your language's module, and then eval interactions expressed as quoted S-expressions or syntax objects. Here's a basic example for testing `match`: #lang racket/base

Re: [racket-users] Obtaining the path of the application program?

Usually, if you want to refer to data files etc relative to the current module's file, a good solution is to use `define-runtime-path`. It uses `#%variable-reference` as the basis for its implementation, but adds other features like cooperation with `raco exe` (see docs for `define-runtime-path`

Re: [racket-users] Injecting local contracts for prefab constructors

I'm not clear on what constraints you're working under with respect to modules, but hopefully you can adapt this to your needs. One option is to use a combination of `define-module-boundary-contract` (or `define/contract`) and `define-match-expander` to bind a name that can be used as a

Re: [racket-users] macros in Racket repository

Here are the three most convenient ways I know of to find that information (which is "$RACKET/collects/racket/private/qq-and-or.rkt" in this specific case): If you use DrRacket, then open a file that uses `and`, right-click on an occurrence of `and`, and choose "Open Defining File" (which changes

Re: [racket-users] Tell require where to find C libraries ?

Sorry, I did miss those emails. What do you see if you try (require taglib) after starting Racket with logging for "ffi-lib"? For example: $ PLTSTDERR="debug@ffi-lib" racket unrelated logging > (require taglib) ??? If it lists the file you pointed to in your email and says

Re: [racket-users] Tell require where to find C libraries ?

It looks like there are two issues. One is the shared library's directory, but the other is that the Racket library is looking for "libtag_c.so.0", and you have "libtag_c.so.3.0". That is, it's looking for a version suffix of "0", not "3.0" (see

Re: [racket-users] How do I, a client, get a copy of an untrusted server certificate?

Yes, that's right. Ryan On Mon, Apr 12, 2021 at 4:23 PM Sage Gerard wrote: > Understood, thank you. By "trusted location," do you mean a server with a > certificate that operating systems already trust? > On 4/12/21 10:15 AM, Ryan Culpepper wrote: > > Racket doe

Re: [racket-users] How do I, a client, get a copy of an untrusted server certificate?

Racket does not provide a way to do that. You can use `openssl s_client -showcerts -connect host:port < /dev/null` to get the server's certificate chain in PEM form (with other logs around it). Of course, an attacker could intercept the connection and send you their CA certificate instead. It

Re: [racket-users] Re: Do I need to explicitly enable readline support for the REPL?

Yes, since version 6.7 Racket automatically loads xrepl, which automatically loads readline support (or libedit support, if readline-gpl is not installed). Ryan On Sat, Mar 13, 2021 at 8:39 AM Tim Lee wrote: > Is it possible that the documentation is outdated? > > According to >

Re: [racket-users] Parenthesizing infix expressions in Redex renderings?

The `binary-rw` function from unstable/gui/redex library has some support for optionally parenthesizing its arguments. Ryan On Wed, Feb 24, 2021 at 11:07 AM David Thrane Christiansen < da...@davidchristiansen.dk> wrote: > Hello all, > > I'm working on coding up a little language model in

Re: [racket-users] synchronization with ffi/unsafe/os-thread

On Tue, Jan 26, 2021 at 3:06 PM Matthew Flatt wrote: > At Tue, 26 Jan 2021 14:49:22 +0100, Ryan Culpepper wrote: > > Thanks for the pointer! Those sound useful, but in the spirit of maximum > > caution, is there a guarantee that the write to the box from the new OS > > t

Re: [racket-users] synchronization with ffi/unsafe/os-thread

On Tue, Jan 26, 2021 at 1:23 PM Matthew Flatt wrote: > At Tue, 26 Jan 2021 10:25:42 +0100, Ryan Culpepper wrote: > > This "works", but is it reliably safe to use place-channel-put from an OS > > thread? > > No. It's not intended to work from an arbitrary OS threa

[racket-users] synchronization with ffi/unsafe/os-thread

I'm trying to figure out how to use ffi/unsafe/os-thread to call a long-running foreign function in an OS thread to avoid blocking other Racket threads. I want to communicate the result of the foreign call to the original Racket thread and have it wake up when the call completes. Normally I could

Re: [racket-users] Why do single-form modules behave differently?

It's the consequence of two design goals: 1. The `module` form is separate from the `#%module-begin` syntax hook so that the module's initial language can pick the hook macro that controls the entire module body. 2. Racket's primitive syntax is designed so that it can be re-expanded. (The

Re: [racket-users] resumable exceptions (or: How can I break myself?)

I would suggest avoiding exceptions and continuations and have a separate parameter[*] that holds the current unexpected character handler. You'll still have to figure out what kind of thing it returns (void, or a replacement character, or a new input port?), but you have to do that anyway. The

Re: [racket-users] Using expr/c within one syntax class?

selection ...) #t] > [_ #f]) > > In this case, is it better form to use raise-syntax-error in a #:when > pattern directive for a syntax class, or beneath a clause of syntax-parse? > I suspect that syntax classes should not have an opinion about flow control. > > *~slg* > > >

Re: [racket-users] Using expr/c within one syntax class?

Based on what you have written so far, the `versions` macro has no sub-expressions, so you shouldn't use `expr/c` at all. It requires version bounds to be in the form of literal strings. So you could describe the macro using a grammar as follows: Expression ::= | (versions Version ...)

Re: [racket-users] TLS via make-ssl-connect@?

`make-ssl-connect@` automatically uses whatever versions of TLS the OpenSSL library supports, including TLS 1.3 for recent versions of OpenSSL. Ryan On Fri, Dec 11, 2020 at 1:47 AM Sage Gerard wrote: > I've seen articles say "SSL" when they mean "TLS". When I read the docs > for

Re: [racket-users] Help implementing an early return macro

This is a nice example of a macro design pattern that I think of as "partial expansion with trampolining". You don't need to deal with the internal definition context API, because you can return definitions to the macro expander, let it handle their interpretation, and then resume your work.

Re: [racket-users] Hygiene for a curried macro

Yes, the behavior you're seeing is a consequence of hygiene, and you should see the same behavior in other Scheme implementations. When the expander gets to the `let-third` call, there is a `var` identifier in the macro's template that is used as a binder, and there is a `var` identifier in the

Re: [racket-users] querying MS SQL Server with db-lib (ODBC)

tacontinuation-frame >call-with-empty-metacontinuation-frame-for-swap > > > I also confirmed using odbc-driver-connect directly that no connection is > actually made. Do you have any other suggestions? Thanks again! > > > -- > "Ad astra per alia porci" > >

Re: [racket-users] querying MS SQL Server with db-lib (ODBC)

The last time I tested connecting to MS SQL Server on Windows (several years ago), I think I was able to connect using some drivers but not others. I was simultaneously trying to figure out authentication and the connection string format, so once I got a working configuration I stopped

Re: [racket-users] Incorporating Markdown documents into Scribble

Okay, if I understand correctly, you would expect the trailing text in my example to be appended to the final subsection from the file. In that case, does it work if you simply remove the call to `decode-flow` from the definition of `markdown-inline`? Then the function would just return a list of

Re: [racket-users] Incorporating Markdown documents into Scribble

What should the splicing version do in the following case: some text @(markdown-inline "file-with-sections.md") some trailing text In particular, what should happen to the trailing text? Scribble doesn't have a notion of returning to the top-level after a section. One possibility would be

Re: [racket-users] difference in struct printing from default #:transparent versus make-constructor-style-printer

The Racket printer uses a separate property to determine whether a struct is quotable. If you add #:property prop:custom-print-quotable 'never to the declarations of Int2 and Prim2, your program should produce the output you expect. I'll add a note to the docs for

Re: [racket-users] Can Racket implement LockedMagicDoor example of MIXEDJAVA?

On Wed, Aug 12, 2020 at 7:19 PM Siyuan Chen wrote: > Dear Ryan, > > Thanks for your solution, it works nicely! > > But I still have some questions: > > For this particular problem of LockedMagicDoor, we can use `trait` to > solve the `mixin` problem, but can we use the same method for more

Re: [racket-users] Can Racket implement LockedMagicDoor example of MIXEDJAVA?

I don't know of a way to solve that problem using the Racket class system alone, but here is a solution that uses traits instead, which allow you to rename the hook methods after the fact so they don't collide. ;; (require racket/trait) (define secure-trait (trait (inherit

Re: [racket-users] macro hiding in raco expand

You can use the functions from macro-debugger/expand to do this (within limits). Here's a very rough example program that reads one term from stdin and shows its expansion with the given hiding policy (discarding hygiene information---beware). usage: racket expand.rkt < your-example-file.rkt

Re: [racket-users] ask the type of a value

but beware, for > (for-each (lambda (x) (printf "~a: ~a\n" (~v x #:min-width 28) (struct->vector x))) (list "hello" (let () (struct string (n)) (string 5 "hello" : #(struct:string ...) # : #(struct:string ...) Ryan On Mon, Aug 3, 2020

Re: [racket-users] telling apart files ending with a newline

If I understand the docs correctly, the OS-specific handling is in open-input-file, but it is not the default. Here is an alternative to read-line that preserves line endings: #lang racket/base ;; my-read-line : InputPort -> String ;; Like read-line, but preserves line ending. ;; Fails

Re: [racket-users] Why am I not fully releasing this SSL listener?

If you create the ssl-listener with reuse?=true instead, like this (define listener (ssl-listen port 5 #f #t ctx)) does the problem go away? If so, the error might happen because the OS reserves the port number for a while after the listener is closed; see the paragraph about TIME_WAIT in the

Re: [racket-users] How can I increase expansion+compilation speed?

One thing to check is the size of the resulting bytecode file. When I compiled it, I got a 911 KB .zo file. So the most likely reason is that your macros are just producing a lot of code. You can run the macro profiler (eg, `raco macro-profiler aw-schema.rkt`) to get a summary of what macros

Re: [racket-users] Embedded racket (cs) question

I don't know if it helps, but config:installation-name is a promise defined by setup/private/dirs. Ryan On Mon, Jul 13, 2020 at 7:23 PM Matthew Flatt wrote: > I'm not sure how it could be in `dynamic-require` itself, as opposed to > a library that is loaded by `dynamic-require`, but it sounds

Re: [racket-users] Changing the charset/encoding when using the db library

The db library expects to talk to the MySQL server using utf8. If you manage to change the connection encoding (eg with SET NAMES), it is likely to confuse the db library and either corrupt data or make the connection fail with an error. Can you explain what you want to accomplish? Ryan On Sat,

Re: [racket-users] Are Regular Expression classes Unicode aware?

that there are some cases with scripts requiring multiple code > points to render a single character such as Arabic with pronunciation marks > e.g. دُ نْيَا. At the moment, I don’t have the time (or need) to > investigate further. > > The depth of Racket’s Unicode support is i

Re: [racket-users] Are Regular Expression classes Unicode aware?

If you want a regular expression that does match the example string, you can use the \p{property} notation. For example: > (regexp-match? #px"^\\p{L}+$" "h\uFFC3\uFFA9llo") #t The "Regexp Syntax" docs have a grammar for regular expressions with links to examples. Ryan On Thu, Jul 9, 2020

Re: [racket-users] Re: DB hangs with postgres and broken network link

Hi Curtis, thanks for the report. No, that isn't supposed to happen. I haven't managed to reproduce a silent hang, and looking over the virtual-connection code it looks like any errors (eg, TCP timeout) should be propagated to the caller. On the other hand, I don't have a way of simulating a

Re: [racket-users] Wills, plumbers, and checking if a port is closed

Here's a function that creates a thread that waits until a port is closed and then prints a message: (define (watch-for-port-close p) (thread (lambda () (sync (port-closed-evt out)) (eprintf "port closed\n" For example: (define out (open-output-string)) (watch-for-port-close out)

Re: [racket-users] Re: note about parsing speed of xml vs sxml?

Thanks Alex for pointing out the use of list->string. I've created a PR ( https://github.com/racket/racket/pull/3275) that changes that code to use string ports instead (similar to Hendrik's suggestion, but the string port handles resizing automatically). Could someone (John?) with some large XML

Re: [racket-users] Poor documentation of List*

`(List* T)` is the same as `T`, just as `(list* x)` is the same as `x` (whether `x` is a list or not). > (require typed/racket) > (list* 4 5 6) - : (List* Positive-Byte Positive-Byte Positive-Byte) '(4 5 . 6) > (list* 6) - : Integer [more precisely: Positive-Byte] 6 > (:type

Re: [racket-users] What is the purpose of "compact" code paths in print.c?

Based on a quick look, I believe it has to do with serializing compiled code, including quoted values embedded in compiled code. Serializing compiled code uses the same entry point as the other printing functions. For example, try this: (write (compile '(quote (1 2 3 and compare the

Re: [racket-users] Exception throwing in web-server

internet tells me that browsers don't support them. Ryan On Mon, May 25, 2020 at 9:48 PM Norman Gray wrote: > > Ryan and Matthew, hello. > > On 25 May 2020, at 19:43, Ryan Culpepper wrote: > > > As I understand the HTTP protocol (that is, some but not lots), the > >

Re: [racket-users] Re: Exception throwing in web-server

As I understand the HTTP protocol (that is, some but not lots), the most reasonable thing for the server to do if it discovers an error after the status code has been sent seems to be to just hang up and let the client realize that *something* went wrong. I don't mean just truncate the output; I

Re: [racket-users] Re: local variables are hyperlinked in scribble/manual

You can also use make-element-id-transformer, like this: (define-syntax SET (make-element-id-transformer (lambda _ #'(racketvarfont "set" Then Scribble will automatically replace SET within rendered code with the element expression above. Another trick is to break the

Re: [racket-users] Make your computer talk in Racket on Windows in 5 lines

I wrote a little flashcard program in Racket to help myself learn Czech vocabulary (here: https://github.com/rmculpepper/racket-jazyk), and when run on a Mac it uses `say` for audio. IIRC, I had to install extra "voice" packages for Czech, but that consisted of clicking a few buttons in Settings.

Re: [racket-users] Separate compilation/caching for Scribble?

) 'replay 'record)) Ryan On Wed, Mar 25, 2020 at 8:57 PM William J. Bowman wrote: > On Wed, Mar 25, 2020 at 08:51:18PM +0100, Ryan Culpepper wrote: > > You can use `raco make` (or `raco setup` for docs of installed packages) > to > > compile the Scribble files, but that won't co

Re: [racket-users] Separate compilation/caching for Scribble?

You can use `raco make` (or `raco setup` for docs of installed packages) to compile the Scribble files, but that won't compile the examples. Those are dynamically evaluated when the Scribble documents are run. For `make-log-based-eval`, are you using a separate evaluator (and separate log file)

Re: [racket-users] Implementation of paraeters

A parameter object itself is essentially just a key. To get its value, you first look up the current parameterization in the current continuation's continuation-marks. The parameterization contains an immutable eq?-hash mapping parameter keys to thread cells. The parameter's value is the value of

Re: [racket-users] How to convert String to Integer

What should `(myconversion "apple")` return? What should `(myconversion "12.3")` return? What does `string->number` do in each of those cases? Ryan On Tue, Feb 11, 2020 at 11:34 AM Alain De Vos wrote: > I tried the following function to conver a String to an Integer. > > #lang typed/racket >

Re: [racket-users] Rolling dice game

On 2/3/20 12:31 PM, Wilzoo wrote: Hi guys, so I am working on rolling dice game in GUI, the game rules will be something like rolling 3 dices and then giving out points to 2 players based on the rolled values. Im now stuck on the showing value in GUI. Basically what I need is to show rolled

Re: [racket-users] Opening unix domain socket with SOCK_SEQPACKET in Racket?

On 1/29/20 12:14 AM, Milo Turner wrote: Hello all, I'm wondering if it's possible to open a unix domain socket with SOCK_SEQPACKET in Racket? It looks like currently unix-socket-lib uses SOCK_STREAM, and doesn't allow you to configure that flag. Is there a reason for this, or would it be a

Re: [racket-users] Create an identifier in syntax

On 1/23/20 3:59 PM, Sean Kemplay wrote: Hello, I am exploring macros and am trying to define a variable at the top level (with the goal in mind to dynamically define a group of functions from a macro). with-syntax works fine however I was just wondering if it is possible to directly inject

Re: [racket-users] Help me understand FFI callouts in this context?

On 10/25/19 12:45 AM, Sage Gerard wrote: I am porting some C++ code to Racket that uses a function pointer. C++ origin: See 294 through 306: https://github.com/Erkaman/vulkan_minimal_compute/blob/master/src/main.cpp#L294 Racket destination:

Re: [racket-users] How do I secure secrets in memory?

On 9/27/19 6:56 PM, Sage Gerard wrote: I got sloppy here in a Stripe integration: https://github.com/zyrolasting/stripe-integration/blob/master/main.rkt#L31 I'm not an InfoSec expert, but I know I'd like to secure the secret key used here in memory instead of using a parameter. I'd probably

Re: [racket-users] syntax-parse ellipsis question

On 9/21/19 10:15 PM, Jonathan Simpson wrote: Given this macro that I'm experimenting with: (syntax-parse #'(1 2 2 a 2 2 b 2 c) [(1 (~seq n:nat ...+ x) ...) #'((n ... x) ...)]) How would I change it so that it returns #'(2 2 a 2 2 b 2 c) instead of #'((2 2 a) (2 2 b) (2 c)) ? I don't want

Re: [racket-users] Racket Jupyter/nextJournal

On 8/14/19 2:57 PM, tbrooke wrote: There has been some discussion about Racket on Jupyter. nextJournal is a fairly new project for hosted notebooks that is written in Clojure and has support for Clojure as well as several other languages. In addition to Clojure they have templates for Julia, 

Re: [racket-users] Name of undefined identifier as string in macro

On 8/3/19 10:48 AM, Zelphir Kaltstahl wrote: Hi! I am trying to write a macro, which checks the name of an argument for presence a substring. This is not the main purpose of the macro, but I want to do different things depending on the substring being contained or not contained. Here is

Re: [racket-users] Can I use the macro stepper to debug an infinite expansion loop?

The macro stepper *should* pop up a dialog after a certain (large) number of steps and ask if you want to interrupt it and see the expansion up to that point. For example, try this: #lang racket (define-syntax-rule (m) (m)) (m) The dialog should show up in a second or two. It can't

Re: [racket-users] DrRacket UI question ...

On 7/21/19 10:41 PM, Tim Meehan wrote: When hovering over names in a program that I downloaded to examine, I noticed a purple question mark that I had not remembered seeing before. I am used to hovering over a name and seeing where else it is used, etc., but I don't remember seeing the purple

[racket-users] CFP: 4th Workshop on Meta-Programming Techniques and Reflection (Meta'19), Co-located with SPLASH 2019

Scholliers, Ghent University ### Program Committee Nada Amin, University of Cambridge, UK Edwin Brady, University of St Andrews, UK Andrei Chis, Feenk, Switzerland David Thrane Christiansen, Galois, Portland, Oregon, USA Tom Van Cutsem, Bell Labs, Belgium Ryan Culpepper, Czech Technical University

Re: [racket-users] problem with current-error-port in scribble interaction

The `uncaught-exception-handler` parameter controls the *bottom* of the exception handler stack, so it won't override the exception handler installed by Scribble's `interaction` form. If you use `with-handlers` (or `call-with-exception-handler`) instead, it should work. The

Re: [racket-users] Racket SIGSEGV during FFI call

On 6/26/19 6:34 AM, Christopher Howard wrote: Hi, I have a project going to make Racket bindings to the libhackrf C library installed on my Debian 9 system. I have successfully made and used bindings to around a dozen procedures in the library. However, when I get to the first really important

Re: [racket-users] exercise 1, racket school 2018

On 6/17/19 4:20 PM, Robert Girault wrote: I was able to do the first half of exercise 1 (see sources at the end of this message) --- write a macro computing some information at run-time. The second half is to write the same macro, but computing some information at compile-time --- I couldn't do

Re: [racket-users] Getting JSON to work with the DB module

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

Re: [racket-users] how do I clear this FFI-related build error?

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

Re: [racket-users] db module 'query' does not return insert-id

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:

Re: [racket-users] db module + SQLite driver + 'ON CONFLICT' = syntax error

On 4/18/19 23:53, David Storrs wrote: On Thu, Apr 18, 2019 at 5:42 PM Ryan Culpepper <mailto:ry...@ccs.neu.edu>> wrote: Use "INSERT OR IGNORE" instead. See https://sqlite.org/lang_conflict.html, 3rd paragraph. Yep.  Unfortunately, this was a simplified case of w

Re: [racket-users] db module + SQLite driver + 'ON CONFLICT' = syntax error

Use "INSERT OR IGNORE" instead. See https://sqlite.org/lang_conflict.html, 3rd paragraph. Ryan On 4/18/19 23:28, David Storrs wrote: On Thu, Apr 18, 2019 at 4:48 PM Jon Zeppieri > wrote: It might well be the SQLlite version. This is a pretty new feature.

Re: [racket-users] Help with evaluation of examples in Scribble

On 3/10/19 4:16 PM, Matt Jadud wrote: Oh! Thank you, Matthew. I see. So, I'm running into the sandbox... as in, the sandbox is doing what it should, and as a result, it is preventing the networked accesses that I've added to my documentation. That's awfully obvious (now that it is put that

Re: [racket-users] How do I (de)serialize PKI keys for storage?

On 12/18/18 23:36, David Storrs wrote: I'm trying to persist public/private keys to our database and having some trouble: Welcome to Racket v6.11. > (require crypto crypto/gcrypt) > (crypto-factories gcrypt-factory) > (define key (generate-private-key 'rsa)) > key (object:gcrypt-rsa-key%

Re: [racket-users] Creating truly unique instances of structure types?

On 11/6/18 11:31 AM, Alexis King wrote: On Nov 5, 2018, at 20:01, Ryan Culpepper wrote: You could use a chaperone to prohibit `struct-info` Good point! I had forgotten that `struct-info` is a chaperoneable operation. This isn’t ideal, though, since I don’t think `struct-info` is ever

Re: [racket-users] Creating truly unique instances of structure types?

On 11/5/18 5:26 PM, Alexis King wrote: To my knowledge, there are two main techniques for creating unique values in Racket: `gensym` and structure type generativity. The former seems to be bulletproof — a value created with `gensym` will never be `equal?` to anything except itself – but the

Re: [racket-users] Compilation/Embedding leaves syntax traces

On 9/25/18 1:11 PM, Alexis King wrote: [] Personally, I would appreciate a way to ask Racket to strip all phase ≥1 code and phase ≥1 dependencies from a specified program so that I can distribute the phase 0 code and dependencies exclusively. However, to my knowledge, Racket does not

Re: [racket-users] Using match on hash tables with optional keys

On 8/31/18 4:28 AM, Greg Hendershott wrote: A general trick for optional values with match is something like (or pat (app (λ _ default-value) pat)). But that doesn't work for hash-table which uses [pat path] for each mapping. (At least I couldn't see how.) Here's _a_ way you could write this as

Re: [racket-users] Where to put scribblings in 'multi package?

On 08/29/2018 12:37 PM, Erich Rast wrote: I have a preliminary scribbling for the manual of a multi source package, but it doesn't show up in Racket's main documentation when I install the package locally. Here is the directory structure: appy | |--info.rkt |--appy | |--

Re: [racket-users] FFI Trouble (file streams, variadic functions)

. -Philip On Mon, Aug 27, 2018 at 8:03 AM Ryan Culpepper <mailto:ry...@ccs.neu.edu>> wrote: On 08/27/2018 02:13 PM, Philip McGrath wrote: > I am hoping for some help debugging a problem I'm having writing FFI > bindings for libxml2. > > I am tryin

Re: [racket-users] FFI Trouble (file streams, variadic functions)

On 08/27/2018 02:13 PM, Philip McGrath wrote: I am hoping for some help debugging a problem I'm having writing FFI bindings for libxml2. I am trying to use the function `xmlValidateDtd`, which (predictably) validates an XML document against a DTD. To support error reporting, the first

Re: [racket-users] Confusion about attributes of struct-id

On 08/16/2018 06:04 PM, David Storrs wrote: The struct-id syntax class from syntax/parse/class/struct-id is puzzling me.  Given this preamble: (require (for-syntax syntax/parse/class/struct-id syntax/parse syntax/parse/experimental/template

Re: [racket-users] ssax:make-parser

On 05/15/2018 11:36 PM, John Clements wrote: Interestingly, it looks like this change is a deliberate one, made by Ryan Culpepper back in 2011. Here’s the relevant commit: commit 738bf41d106f4ecd9111bbefabfd78bec8dc2202 Author: Ryan Culpepper <ry...@racket-lang.org> Date: Tue Nov 22 02

Re: [racket-users] Jupyter Racket Kernel - iracket

On 05/01/2018 09:33 PM, Graham Dean wrote: PR submitted :) PR merged. Thanks! Ryan -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to

Re: [racket-users] how to match unbound identifier as literal in `syntax-parse`?

Here's one way: (~and z:id (~fail #:unless (free-identifier=? #'z #'zeta) "expected the identifier `zeta`")) Another way is to make a syntax class (either specifically for `zeta` or parameterized by the identifier) that does the same check. Ryan On 4/3/18 8:33 AM,

Re: [racket-users] Behavior of nested ellipses

On 03/27/2018 11:46 PM, Ryan Culpepper wrote: On 03/27/2018 10:01 PM, Justin Pombrio wrote: I'm surprised by the behavior of using a pattern variable under one set of ellipses in the pattern, and under two sets of ellipses in the template: [...] BTW, it looks like Macro-By-Example[1

Re: [racket-users] Behavior of nested ellipses

On 03/27/2018 10:01 PM, Justin Pombrio wrote: I'm surprised by the behavior of using a pattern variable under one set of ellipses in the pattern, and under two sets of ellipses in the template: | #lang racket (require(for-syntax syntax/parse)) (define-syntax (test stx) (syntax-parse stx [(_

Re: [racket-users] Storing JSON into PostgreSQL 10

On 03/16/2018 11:28 PM, David Storrs wrote: I'm noticing that when I store jsexpr?s into PostgreSQL 10 I end up with them as strings, not as actual JSONB data.  I've read the docs and tried every combination of typecasting / methods of writing that I can think of but nothing ends up working. 

Re: [racket-users] Output Port Shenanigans

On 03/14/2018 06:16 PM, Lehi Toskin wrote: On Wednesday, March 14, 2018 at 10:10:20 AM UTC-7, Matthew Butterick wrote: probably it requires a combination of peek + read, or copying the port. That may be true, but I've been messing around getting *anything* to print from inside that

Re: [racket-users] syntax/parse is not hygienic

On 03/04/2018 09:40 PM, Alexis King wrote: [... context ...] Still, with all this context out of the way, my questions are comparatively short: 1. Is this lack of hygiene well-known? I did not find anything in Ryan’s dissertation that explicitly dealt with the question, but I

Re: [racket-users] Generating automatic testsuites using a macro

On 2/23/18 3:36 PM, 'Paulo Matos' via Racket Users wrote: On 23/02/18 15:13, 'Paulo Matos' via Racket Users wrote: That's true, thanks for pointing it out. I only just noticed you could generate test-suites and test-cases at runtime with make-testcase and make-testsuite. Therefore I will

Re: [racket-users] whither `splicing-parameterize`? or am I doing it wrong?

It might make sense to `(set! new-parameterization #f)` at the end so that the parameterization (and the values it holds) can be GC'd sooner when splicing-parameterize is used at top level or module level. Ryan On 1/24/18 6:00 AM, Alexis King wrote: Here is an implementation of a version of

Re: [racket-users] Cryptography routines in Racket

I have a crypto library in progress that I haven't released yet. The repo is at https://github.com/rmculpepper/crypto, but the repo is missing a lot of local commits and I won't be able to fix it until mid-January. If you want to try out the old version, you'll also need asn1-lib from

Re: [racket-users] confused about raco check-requires error

On 11/21/17 2:57 AM, Alex Harsanyi wrote: I'm trying to use the "raco check-requires" command to determine which requires I should remove from my source files, and the command fails when I include one of my files (the application compiles and runs fine). I managed to reproduce the case as

Re: [racket-users] okay for the stepper to blanket disarm all syntax?

On 10/16/2017 12:38 PM, 'John Clements' via users-redirect wrote: I’m in the process of trying to update the stepper to handle check-random, and I’m somewhat baffled by the amount of difficulty I’m running into in and around ‘syntax-disarm’. It occurs to me that it would probably be simpler

Re: [racket-users] Re: code reflection

On 10/14/2017 05:01 AM, George Neuner wrote: On 10/14/2017 3:00 AM, Jack Firth wrote: So is there a way ... from normal code ... to get at the locals of functions higher in the call chain?  Or at least the immediate caller? Some reflective capability that I haven't yet

Re: [racket-users] syntax-parse attributes in macro-generated macros

On 09/17/2017 01:00 AM, Philip McGrath wrote: [...] I have a macro like `example-macro`, but more complicated and with many, many more potential keyword arguments, so I wanted to write a macro that would let me define `example-macro` with a more declarative syntax, like this:

Re: [racket-users] Efficient & "nice" communication mechanism between Racket and other languages

On 09/07/2017 12:11 PM, Brian Adkins wrote: I'm considering having a group of programmers create micro-services in various programming languages to be glued together into a single application. I would like a communication mechanism with the following characteristics: * Already supported by

Re: [racket-users] Generate function defintions at compile time

On 08/22/2017 05:29 PM, hiph...@openmailbox.org wrote: Hello, I am writing a Racket library which will make it possible to control the Neovim text editor using Racket. People will be able to use Racket to control Neovim, as well as write plugins for Neovim in Racket.

Re: [racket-users] "Test did not clean up resources" message from GUI test runner

On 08/20/2017 09:28 PM, Alex Harsanyi wrote: I just noticed that the GUI test runner displays "test did not clean up resources" messages on my tests, but it is not clear to me what resources are not being cleaned up. I tried to reproduce the problem in the following test case: #lang

Re: [racket-users] Anyone using MongoDB 3.2.15 with DrRacket 6.9?

On 08/06/2017 05:49 PM, Cecil McGregor wrote: [...] What are other people using for a NoSQL racket experience? Are you looking for no schema or no ACID? If the latter, the git version of the db library now has experimental support for Apache Cassandra. Ryan -- You received this message

Re: [racket-users] chaining operations on bignum not scalable

On 07/29/2017 02:48 PM, rom cgb wrote: Hi, Probably due to all operations not being in-place, chaining operations on bignums is very costful. for example, using bitwise-bit-field[1] on bignums is atrocious. I also tried (define (reverse-bits n) (for/fold ([reversed 0])

Re: [racket-users] How do db handles interact with threads and parameters

On 7/24/17 9:11 AM, George Neuner wrote: Hi David, On 7/24/2017 8:18 AM, David Storrs wrote: What happens in the following code? (define dbh (postgresql-connect ...)) ;; Use the DBH in a new thread (thread (thunk (while ...some long-running condition... (sleep 1) ; don't flood the DB

Re: [racket-users] Struct declaration conflict if a file is required implicitly

On 07/23/2017 07:26 AM, Alejandro Sanchez wrote: Hello everyone, I am working on this project: https://gitlab.com/HiPhish/MsgPack.rkt/ I am writing test cases and I ran into a problem with my ‘ext’ structure. It is declared in the file ‘msgpack/main.rkt’, which is required in the file

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