Re: [racket-users] European Racketeers and conferences

2017-10-21 Thread jesse 
On Tuesday, October 17, 2017 at 7:16:13 PM UTC+2, Ben Greenman wrote:

I just changed the map settings so anyone can edit it. 
>

Great idea; thanks for this, Ben. I've just added myself.

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Re: [racket-users] European Racketeers and conferences

2017-10-21 Thread Stephen De Gabrielle 
And I’m in London(Ealing), and while I can’t own a computer without
installing DrRacket, sadly my day job is using ObjectScript(mumps), not
Racket. (ObjectScript isn’t bad, but it’s not Racket)

Stephen
On Sat, 21 Oct 2017 at 12:07, Andreas Olsson  wrote:

> I’m a Swede and a programming hobbyist. I love Racket and as of now I’m
> making a space shooter with Pict3D.
> Had to make a Quaternion module to make flying around possible. I know
> Racket is thought in  Linköpings Universitet here in Sweden, might be good
> place for a meeting.
>
> I might have time for a meeting if it’s in reach.
>
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Kind regards,
Stephen
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Ealing (London), UK

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[racket-users] Racket on Facebook.

2017-10-21 Thread Andreas Olsson 
67!

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Re: [racket-users] code reflection

2017-10-21 Thread Matthias Felleisen 

> On Oct 21, 2017, at 10:51 AM, Konrad Hinsen  
> wrote:
> 
> Matthias,
> 
>> Yes, on rare occasions, Racket programmers need to use the FFI 
>> to link in C libraries, C developers need to include ASM, and 
>> so on. But when we can, we should really stick to high-level 
>> linguistic constructs when possible and available, especially 
>> when they provide a safer way of doing things. 
> 
> At that level of abstraction in the discussion, I certainly agree.
> 
> However, macros are different because I consider syntax-parse a DSL, not
> a general purpose language like Racket, C, or ASM.
> 
> I checked my code to see what the unpleasant macros in there are doing.
> It's not the standard syntax transformation stuff, which syntax-parse
> does very well. I need to transform syntax in place but ALSO extract
> information from macros and collect them for re-using it elsewhere.
> It's not very different from what #lang scribble/lp2 does when it
> puts code blocks both in the module and in the documentation.
> 
> In my experience, syntax-parse is not very good for shuffling stuff
> around like this. It's very probably not what it was designed for
> either.


Now that’s a valid criticism. 

But, in my experience, Lisp-style macros solve these kinds of
problems in the same way that ASM solves the problem of 
grabbing control and storing it away. Sure you can do so and
nobody understands the code later and it’s brittle and error 
prone. In the context of lexical scope, this is equally true for 
Lisp-style macros. Often they don’t have the information you 
need (scope). And when you shuffle code anyways, all kinds
of subtle mistakes sneak in and when you find them, you have
no clue where they come from.

So there, this is another dissertation-level problem probably 
and I expect that building yet another DSL (or at least a layer
of macro communication) may solve it better than going back
to old-style Lisp 

— Matthias

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Re: [racket-users] code reflection

2017-10-21 Thread Konrad Hinsen 
Matthias,

> Yes, on rare occasions, Racket programmers need to use the FFI 
> to link in C libraries, C developers need to include ASM, and 
> so on. But when we can, we should really stick to high-level 
> linguistic constructs when possible and available, especially 
> when they provide a safer way of doing things. 

At that level of abstraction in the discussion, I certainly agree.

However, macros are different because I consider syntax-parse a DSL, not
a general purpose language like Racket, C, or ASM.

I checked my code to see what the unpleasant macros in there are doing.
It's not the standard syntax transformation stuff, which syntax-parse
does very well. I need to transform syntax in place but ALSO extract
information from macros and collect them for re-using it elsewhere.
It's not very different from what #lang scribble/lp2 does when it
puts code blocks both in the module and in the documentation.

In my experience, syntax-parse is not very good for shuffling stuff
around like this. It's very probably not what it was designed for
either.

Konrad.

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[racket-users] European Racketeers and conferences

2017-10-21 Thread Andreas Olsson 
I’m a Swede and a programming hobbyist. I love Racket and as of now I’m making 
a space shooter with Pict3D.
Had to make a Quaternion module to make flying around possible. I know Racket 
is thought in  Linköpings Universitet here in Sweden, might be good place for a 
meeting.

I might have time for a meeting if it’s in reach.

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[racket-users] Racket on Facebook.

2017-10-21 Thread Andreas Olsson 
Yes there is, I did it. 65 members now, slowly increasing.

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[racket-users] Define/override for mouse event?

2017-10-21 Thread Andreas Olsson 
Why do one have to use define/override to get the mouse working on a canvas? 
Why not just call the method? It’s a little bit confusing.

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