Re: [racket-users] XML Modification

> http://docs.racket-lang.org/txexpr/ Hoo-ray! splitf-xexpr is *exactly* what I needed. Thank you for your help! -- 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

Re: [racket-users] Re: adding pref for rsound package

> On Dec 13, 2016, at 17:17, Robby Findler wrote: > > The phase1/phase2 stuff isn't really for preference initialization. > You should be able to just do it when the module require'd (ie at its > toplevl) or when the tool@ unit is invoked. Either phase would also be

Re: [racket-users] Extracting the body of a fully-expanded module (with submodules)

At Wed, 14 Dec 2016 18:12:52 -0800 (PST), Dupéron Georges wrote: > Hello! > > This is a follow-up to the excellent answer by Alex Knauth on StackOverflow > here: http://stackoverflow.com/a/38032107/324969 and this mailing-list > thread: >

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

On Wed, Dec 14, 2016 at 03:50:28PM -0800, Alexis King wrote: > What are the implications of this for the Types as Macros/Turnstile ... > > (Obviously, I have a personal motive for asking this question, since Based on the names of functions in my example, you'd never guess how I ran into this

[racket-users] Extracting the body of a fully-expanded module (with submodules)

Hello! This is a follow-up to the excellent answer by Alex Knauth on StackOverflow here: http://stackoverflow.com/a/38032107/324969 and this mailing-list thread: https://groups.google.com/forum/#!topic/racket-users/sS-pUUGp9o4 I'm trying to write a module meta-language mylang, which accepts a

Re: [racket-users] ->i applies contract projections multiple times?

Robby beat me to it. For a longer discussion, see Christos, Robby, Cormac and Matthias’ paper: http://www.ccs.neu.edu/racket/pubs/popl11-dfff.pdf on the difference between dependent (->d) and indy-dependent contracts (->i). A contrived example of why this is better is: (define/contract (foo x

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

> On Dec 14, 2016, at 7:14 AM, Matthew Flatt wrote: > > To summarize, don't try to attach syntax objects as property values > like that. I know this advice sounds ironic, given that the original > use of properties was for syntax-valued keys like 'origin. Properties > like

Re: [racket-users] ->i applies contract projections multiple times?

I think it could be possible to avoid those printfs but only because the contracts used here are flat, but the implementation of ->i doesn't do that specialization. In the general case, the contract on each of the depended on arguments (x and y in this case) have to be applied twice, once to catch

[racket-users] ->i applies contract projections multiple times?

This question comes from someone else on Stack Overflow, which they asked here: http://stackoverflow.com/q/41144374/465378 I think it’s likely that the people who can answer this are probably only on the mailing list, though, so I figured I’d ask it here. Basically, the ->i contract applies

[racket-users] Re: XML Modification

On Thursday, December 15, 2016 at 12:04:23 AM UTC+1, Lehi Toskin wrote: > I have some XML - rather, XMP data from an image - that I'd like to mess > around with. I've investigated the xml library and found that I can turn the > XML into an XEXPR so I can play around with it like that and even

[racket-users] XML Modification

I have some XML - rather, XMP data from an image - that I'd like to mess around with. I've investigated the xml library and found that I can turn the XML into an XEXPR so I can play around with it like that and even search through it with se-path*/list, but how would I go from there to

[racket-users] Re: Good Data Structures Book?

On Wednesday, December 14, 2016 at 12:19:51 PM UTC-5, Prabhakar Ragde wrote: > > I am developing such a course for a spring term (May-August) offering at > the University of Waterloo (though it will probably use OCaml). There > does not appear to be an ideal textbook; I plan to synthesize

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

At Wed, 14 Dec 2016 10:43:34 -0700, Matthew Flatt wrote: > But right now, as Sam well knows I'd like to clarify that this is because Sam has been very helpful in making things better --- not that he's been asking for new things. -- You received this message because you are subscribed to the

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

Yes, it's obviously easier to implement this new feature with the new expander. But right now, as Sam well knows, I'm open to patches only as long as they make things no slower and no bigger. :) The current implementation is reliably within a factor of 2 of the old one, but we're still working to

Re: [racket-users] Good Data Structures Book?

> On Dec 14, 2016, at 9:19 AM, Prabhakar Ragde wrote: > > Lawrence Bottorff wrote: > >> Can someone suggest a good text for data structures that would >> compatible with Racket? All I see are treatments using C/C++, Java, >> Python, i.e., the usual suspects. Or, how do

[racket-users] Good Data Structures Book?

Lawrence Bottorff wrote: Can someone suggest a good text for data structures that would compatible with Racket? All I see are treatments using C/C++, Java, Python, i.e., the usual suspects. Or, how do you people at Racket-friendly/based universities teach undergrad data structures? I am

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

> On Dec 14, 2016, at 10:23 AM, Sam Tobin-Hochstadt > wrote: > > On Wed, Dec 14, 2016 at 10:14 AM, Matthew Flatt wrote: >> More generally, changes to the scope of a >> syntax object are not propagated to property values that happen to be >> themselves

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

On Wed, Dec 14, 2016 at 10:14 AM, Matthew Flatt wrote: > More generally, changes to the scope of a > syntax object are not propagated to property values that happen to be > themselves syntax objects. When you put a syntax object into a > property, then you get whatever that

Re: [racket-users] syntax-property lost across module boundary (WAS: format-id doesn't preserve preserved?-edness of syntax-property?)

I think there are two problems in this example. The first problem is that preserved syntax properties were not actually preserved in bytecode for a syntax object that has no source location. (I'm assuming that Alexis's tests were run in DrRacket in it's default mode of compiling bytecode for

Re: [racket-users] Package catalog - can't connect

Hello group, I have inspected things. And upon careful println debugging (around mzssl.rkt:760), ended up running: mkdir -p home/mflatt/build/bl/l64/dest/ssl/ wget -O /home/mflatt/build/bl/l64/dest/ssl/cert.pem http://curl.haxx.se/ca/cacert.pem Which actually fixed the raco install. I guess

Re: [racket-users] Good Data Structures Book?

"Pearls of Functional Algorithm Design" https://www.amazon.com/Pearls-Functional-Algorithm-Design-Richard/dp/0521513383/ref=sr_1_1 The functional "programming pearls" in Haskell, but the author prefers the term "algorithm design". On Wed, Dec 14, 2016 at 2:48 AM, Ben Greenman