Hello,
I was having trouble figuring out how to get racket to print values however I
wanted. In particular, I was hoping to make exact nums print as decimals and
true print as true (and not #t or #true). It would also be nice if I could
custom print procedures so that + printed as plain old + o
>
> There would be nice, to have a collection of scribble examples describing
> how to obtain certain functionality or effects, as for example "indentation
> of a paragraph".
>
Yes, it would be good to have an FAQ somewhere.
Sometimes I try to post things like this on stack overflow, in the hope
At Thu, 22 Jun 2017 14:59:35 -0700 (PDT), kay wrote:
> There're files that starts with BOM. When reading from those files, it seems
> all of Racket's I/O API don't know to strip the BOM, making them extremely
> difficult to work with.
I think that's the normal choice for UTF-8 readers. (Just to
There're files that starts with BOM. When reading from those files, it seems
all of Racket's I/O API don't know to strip the BOM, making them extremely
difficult to work with.
For example, Here is a UTF-8 encoded text file with BOM header. To be exact,
here's the binary layout of the file cont
Dear Racket developers,
On my personal computer, I successfully installed the package for
the nonofficial implementation of R7RS in Racket.
But I didn't this operation at my university, the answer is
https://... proxy web incorrect address
I searched the documentation but I don'
Bizarre, I was for some reason very convinced that begin defined its own scope!
I guess I usually called it in the positions in which it becomes an expression
as opposed to being used in its special form with splicing. The macro is
working like a charm now.
Thanks, I thought the solution would
Are you sure that `begin` doesn't suffice for your needs? It has a somewhat
unintuitive scoping behavior. From the docs [1]
The begin form is special at the top level, at module level, or as a body
after only internal definitions. In those positions, instead of forming an
expression, the content o
Hi Sam,
I'm a little unclear on your intended use case since (begin ...) does
splice defines, for instance:
(define (add-something x)
(begin
(define one 1)
(define two 2))
(+ x one two))
;;
Welcome to DrRacket, version 6.9 [3m].
Language: racket/base, with debugging; memory limit
Hello,
It's simple enough to write a macro that defines something.
(define-syntax-rule (my-define name binding)
(define name binding))
But what if I would like to define multiple things? I.e.
(define-syntax-rule (my-multiple-define name ... binding ...)
(define name binding) ...)
The abo
Ok, I think I've got it, but just to make sure I'm not missing any
subtleties, or else for the benefit of posterity, here's the version with
thread cells.
In "common.rkt":
#lang racket
(provide my-val
call-with-my-val)
(define cell:my-val
(make-thread-cell #f #t))
(define (my-val)
On Wednesday, June 21, 2017 at 10:27:38 PM UTC-7, Ben Greenman wrote:
> #lang scribble/manual
> @require[
> (only-in scribble/core style)
> (only-in scribble/html-properties attributes)]
>
>
> @(define new-window-style
> (style #f (list (attributes '((target . "_blank"))
>
>
> @hyper
Thanks Matthew, that's fascinating. So do you think I was encountering it
due to something like background expansion and a test submodule with quoted
reference cases in my checks or something else? Maybe having that file open
while also working on a file that requires it? I looked over the source
f
This is a bug in prefab registration when an instance of the prefab is
loaded via `read` before the `struct` declaration is encountered.
In other words, putting
'#s((indexable (2 #f)) 0 #f)
at the *start* of the first module below and running in a fresh Racket
or DrRacket will demonstrate the p
Thank you, everyone!! I've gained some nice big picture lessons and appreciate
the welcome to the community.
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Hi Racketeers,
I am having some frustrations dealing with mutable prefab structures,
getting errors about attempting to mutate an immutable structure. I wish I
could give you a sequence of simple steps that I know for sure would
reproduce the problem but I have not found them. I thought I had one
On Thu, Jun 22, 2017 at 10:21 AM, Philip McGrath
wrote:
> I've come up with a (relatively) minimal example.
>
> In "common.rkt":
>>
>> #lang racket
>> (provide my-param)
>> (define my-param
>> (make-parameter #f))
>
>
> In "servlet.rkt":
>>
>> #lang web-server
>> (require "common.rkt")
>> (provi
I've come up with a (relatively) minimal example.
In "common.rkt":
> #lang racket
> (provide my-param)
> (define my-param
> (make-parameter #f))
In "servlet.rkt":
> #lang web-server
> (require "common.rkt")
> (provide start)
> (define (start req)
> (response/xexpr
>`(html (head (title
My apologies, the code I just posted was missing a `reverse`. Here's the fixed
version:
@(define (sec-number→string tag #:doc [doc #f])
(delayed-element
(λ (the-renderer the-part the-resolve-info)
(define sec-tag (make-section-tag tag #:doc doc))
(define resolved-sec-tag (resol
Hi Philip,
I think I'd have to see more code to really tell what the problem is,
but here are some thoughts:
- A continuation captures the values of parameters at the time it is
captured. So, if your parameterize is outside of the dispatcher that
calls the continuation, then the code inside the c
Thanks a lot!
I was able to build an @sec-number-ref function. Here it is below. Matthew,
since this is not a copy-paste of your code, I hope you won't see any problems
if I place this in the public domain / CC0 license?
@(define (sec-number→string tag #:doc [doc #f])
(delayed-element
(λ
At Thu, 8 Jun 2017 08:55:00 -0700 (PDT), Dupéron Georges wrote:
> Generally it is nice to get the actual section title printed when using
> @secref["mysection"]. However, in some cases it is a bit awkwards:
>
> Chapter State of the art presents related work. Chapter Implementation
> explains in
You can set "doc-site.css" and "doc-site.js" to customize the
presentation of documentation. That's how http://docs.racket-lang.org/
adds the Racket logo to the top-right of the page, for example. When
you re-render documentation via `raco pkg` and/or `raco setup`, they
won't replace your "doc-site
I'm encountering some strange behavior when using parameters with my
(stateless) web servlets.
I want to check the value of a cookie every time a request is made to my
server and make a Racket value derived from the cookie's value available
for use within the servlet code. Since this value shouldn
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