Re: [racket-dev] Revising Racket's home page
Eli wrote: Semi-Quick: take Prabhakar's intro (cs.uwaterloo.ca/~plragde/tyr/) and make it terse enough to fit a single (longish) page. I think that this is a fine choice for an aspiring hacker -- the only part that is missing, the advanced section, is probably the part that should at best be a very quick overview for a bunch of things that you could do, mostly serving as a link hub. If this idea meets with general approval, I'd be happy to collaborate/consult with a co-author on doing this, but I am not a hacker and don't purport to understand what they want, so I'd need a co-author who could curb my professorial tendencies. (And I really should get around to finishing the advanced section.) --PR _ Racket Developers list: http://lists.racket-lang.org/dev
[racket-dev] Is it possible to write `flatten' in TR?
Neil wrote: (define (flatten lst) (cond [(list? lst) (append* ((inst map (Listof A) (Listof* A)) flatten lst))] [else (list lst)])) This version of flatten has quadratic worst-case running time. Is that an issue? A linear-time implementation is possible. Eli has a nice post somewhere about this. That would probably run into the same type issues (no better, no worse). --PR _ Racket Developers list: http://lists.racket-lang.org/dev
Re: [racket-dev] [racket] match and debug in Advanced Student
On 11/8/11 11:21 PM, Jay McCarthy wrote: I'm not sure I'm the best person to debug this (despite otherwise being responsible for match in ASL.) Then are you the person I lobby to get match into ISL+? --PR _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] racket/match is broken
Sam wrote: Unlike, say, `syntax-parse', `match' isn't designed for the use-case of building ASTs while matching. Wait, what? That's exactly what I want to use it for when writing toy interpreters for pedagogical purposes. Or am I misunderstanding what you're saying here? I want to do PLAI-style things, but with `match' instead of `type-case'. --PR _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
Re: [racket-dev] racket/match is broken
On 10/6/11 2:12 PM, Eli Barzilay wrote: Sam is talking about building the ASTs *while* matching, which is what Jay was trying to do with uses of `app'. I think that a teaching context is in particular one where such a thing doesn't fit -- it obscures the distinction between the side the sexpr goes into, and the side where an AST comes out. Okay, I see the distinction, and I apologize for not having fully understood Jay's example. I agree that this obscurity is hazardous. I think, though, that I have always assumed left-to-right matching, though I may never have constructed anything that would break if it didn't happen. --PR _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
[racket-dev] Scribble output changes
Matthew wrote:
Latex output changed in more ways:
* Table content is vertically centered by default, making it more
consistent with HTML.
* In a table cell, a paragraph with a `#f' style name is rendered as a
single line (as before), but a width is imposed on paragraphs that
have a style name to make them flow as paragraphs.
For what it's worth, I found the documentation on tables largely
incomprehensible, and could not get them to render through LaTeX without
everything all mushed together. I finally wrote my own table function
(using \array, which spaces things out well) that had the formatting I
wanted. Cell styles? No clue.
Apropos of which, I don't know how to produce pure raw LaTeX code from
within Scribble. I can usually cheat with things like
(make-element
(make-style begin '(exact-chars)) ...)
or (make-style relax ...), but for LaTeX package macros that parse one
of their arguments more exactly (where wrapping the argument in
\relax{...} will not work), I have to resort to building what I want at
a high enough level that I can wrap it all in \relax without LaTeX
getting upset. I feel like I'm pretty much doing what the LaTeX renderer
does, but trying to stay within a higher-level API. If we want Scribble
to be a LaTeX replacement but still render through LaTeX, it might need
more thinking as to how to provide access in a Rackety fashion.
Sorry if I'm being completely ignorant here. I'm a passable Racket
programmer but a lousy LaTeX programmer. --PR
_
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Re: [racket-dev] Fwd: a language example: brainfudge
I'm starting to work on a small example of a non-lisp-like language that uses the Racket infrastructure. ?I've chosen the language Brain@#! since it's obviously not parenthetical. Why did you sanitize the name? Is this language different than brainfuck? I found this e-mail exchange hilarious, and read it out loud to my kids. --PR _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/dev
