Re: [racket-users] convert to/from Sribble
No need for that. You can write your own renderer :-) On Apr 22, 2015, at 1:02 AM, Gour g...@atmarama.net wrote: Matthias Felleisen matth...@ccs.neu.edu writes: We'd love to have an additional renderer for Scribble. Good. Btw, is there something like Scribble-2 planned? Sincerely, Gour -- A person is considered still further advanced when he regards honest well-wishers, affectionate benefactors, the neutral, mediators, the envious, friends and enemies, the pious and the sinners all with an equal mind. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] web server: database result paging
On 04/20/2015 05:54 AM, George Neuner wrote: I know I need a different response function. The question was whether embed/url is tied to HTML or can be used in a different context. The documentation (6.1.1) says: When used inside page mailbox:///C:/Users/GW/Documents/Eudora/local/Mail/Local%20Folders/Drafts?number=0part=1.2.2filename=page.html syntactically, a rename transformer for the procedure embedding function; otherwise, a syntax error. That suggests embed/url can be used only in (X)HTML responses and that I need to use something else to create dispatch URLs in regular code. I think I see why that's confusing. The syntax parameter embed/url, is not being used in the code I sent. In that code, embed/url is the name of a regular parameter to the lambda function being supplied to send/suspend/dispatch. I probably should have used a different parameter name. Does that make sense? The final problem is how to ensure that I eventually get to send/finishand clean up my thread. This particular function is expected to be executed quite often. Does the browser app have to invoke a URL that deliberately ends the thread or will the thread end if/whenits continuations timeout? What do you need to clean up? To be clear, there isn't a thread that keeps running - the continuation is just some data, and like Jay said, it will eventually be cleaned up. If you want to remove the continuations manually, call send/forward or send/finish. See the attached code. In particular, try running it, and then copying the url to a second browser window. You'll see how two users have different continuations. My understanding is that serve/servlet executes dispatched functions in separate threads. And I do see server multi-threading in practice - e.g., a quick sequence of XHR calls made by the browser finishing in different order. Timestamped in my application log as well as seen at the browser. So when I send/suspend* there will be a thread left suspended. Will that thread context be cleaned up if the continuation expires? And can I get a notification of which thread is involved? Or better yet, get the thread restarted at yet another point so I can log that it has finished processing. Are the threads just nuked invisibly or are they terminated by an exception that I can catch? My understanding is that when you do send/suspend*, the continuation is saved, and the thread finishes. The continuation and thread are not bound together. So when a request comes in to continue that continuation, it will be a different (new?) thread that runs it. Can you give an example of the processing that you want to know has been finished? Do you want the thread serving the request to do some processing after sending the response? Thanks, Dave -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] DrRacket internal error
Does restarting help? How about re-running 'raco setup'? Robby On Wed, Apr 22, 2015 at 6:21 PM, Alexander D. Knauth alexan...@knauth.org wrote: I’m not sure how it got into this state, but now every time I start typing something or anything like that I get a DrRacket internal error window saying: hash-ref: contract violation expected: hash? given: #f argument position: 1st other arguments...: 'configure-runtime '() context...: /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:450:4: compute-tag+rng method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:47:20 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:56:0: coroutine-run /Applications/Racket/April-16/Racket v6.2.0.2/collects/racket/contract/private/arrow-val-first.rkt:265:18 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:414:4: update-the-strs method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/logging-timer.rkt:41:0: log-timeline/proc /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/timer.rkt:34:38 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:454:6 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:505:32 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:653:3 -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] DrRacket internal error
I'm glad to hear that helped. Looking at the code, I'm puzzled because I don't see how configure-runtime can show up in the code that is in that stacktrace. I'd expect configure-runtime to show up in code that was initializing an environment for running a language, but that code is the new blueboxes code. It's possible it is using a function that is somehow doing that, I guess? It calls path-module-path and xref-binding-definition-tag (that does some stuff with module paths). I'm stumped. Robby On Wed, Apr 22, 2015 at 8:36 PM, Alexander D. Knauth alexan...@knauth.org wrote: Restarting didn’t help, but then raco setup hanged because of an infinite loop in a package of mine, which I then fixed, and then I tried raco setup again, and then it was working again. So the problem, for me, right now, is fixed. On Apr 22, 2015, at 9:23 PM, Robby Findler ro...@eecs.northwestern.edu wrote: Does restarting help? How about re-running 'raco setup'? Robby On Wed, Apr 22, 2015 at 6:21 PM, Alexander D. Knauth alexan...@knauth.org wrote: I’m not sure how it got into this state, but now every time I start typing something or anything like that I get a DrRacket internal error window saying: hash-ref: contract violation expected: hash? given: #f argument position: 1st other arguments...: 'configure-runtime '() context...: /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:450:4: compute-tag+rng method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:47:20 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:56:0: coroutine-run /Applications/Racket/April-16/Racket v6.2.0.2/collects/racket/contract/private/arrow-val-first.rkt:265:18 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:414:4: update-the-strs method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/logging-timer.rkt:41:0: log-timeline/proc /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/timer.rkt:34:38 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:454:6 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:505:32 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:653:3 -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] web server: database result paging
On 4/22/2015 8:12 PM, David Vanderson wrote: On 04/20/2015 05:54 AM, George Neuner wrote: I know I need a different response function. The question was whether embed/url is tied to HTML or can be used in a different context. The documentation (6.1.1) says: When used inside page mailbox:///C:/Users/GW/Documents/Eudora/local/Mail/Local%20Folders/Drafts?number=0part=1.2.2filename=page.html syntactically, a rename transformer for the procedure embedding function; otherwise, a syntax error. That suggests embed/url can be used only in (X)HTML responses and that I need to use something else to create dispatch URLs in regular code. I think I see why that's confusing. The syntax parameter embed/url, is not being used in the code I sent. In that code, embed/url is the name of a regular parameter to the lambda function being supplied to send/suspend/dispatch. I probably should have used a different parameter name. Does that make sense? Ok. I guess then an example would be helpful: how to generate 2 continuation URLs in Scheme code and stick them into a hash. My code now looks like: create a hash representing the return object - data to return convert the hash to a jsexpr send/back the jsexpr What I want to do is: create a hash representing the return object - data to return - URL for next page function (if applicable) - URL for prev page function (if applicable) convert the hash to a jsexpr send/suspend/dispatch the jsexpr My understanding is that when you do send/suspend*, the continuation is saved, and the thread finishes. The continuation and thread are not bound together. So when a request comes in to continue that continuation, it will be a different (new?) thread that runs it. That's fine: the term thread is overloaded. I understand that Racket threads are user-land scheduler activations [I think that's the term] ... i.e. just multiplexed continuations. My point was that there is some execution context hanging around when the thread is suspended and it wasn't clear that it would be GC'd if/when all the thread's send/suspend continuations expire. There's nothing that says definitively that the servlet continuation manager is holding the *only* references to the thread context [or the only strong references if that's more applicable] - somewhere I recall Jay explaining the structure being something like: server-custodian-custodian(s)-thread(s)-user-stuff ??? and it is not clear where the continuation manager lives in the hierarchy [ though I can guess ]. Can you give an example of the processing that you want to know has been finished? Do you want the thread serving the request to do some processing after sending the response? The thread can be suspended after sending a response. What I'd like, though, is for it to wake up again and log some exit data when all continuations expire. That could - with difficulty - be done from an exception handler if the thread is terminated by exception as opposed to simply evaporating, and also provided that I know what exception(s) to catch or events to wait on. One of the issues I've had with real-world Racket programming is determining what exactly happens when things go wrong. A catch-all exn or exn:fail handler doesn't cut it when you need more detail, and, of course, the hierarchy is extensible so things may be thrown that aren't documented. read the code is fine for research, but it isn't a realistic real-world answer - there's too much code and not enough time. As I said to Jay recently, I wouldn't know where to look even if I had the source. Thanks, Dave Thank you, George -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [racket-users] DrRacket internal error
Restarting didn’t help, but then raco setup hanged because of an infinite loop in a package of mine, which I then fixed, and then I tried raco setup again, and then it was working again. So the problem, for me, right now, is fixed. On Apr 22, 2015, at 9:23 PM, Robby Findler ro...@eecs.northwestern.edu wrote: Does restarting help? How about re-running 'raco setup'? Robby On Wed, Apr 22, 2015 at 6:21 PM, Alexander D. Knauth alexan...@knauth.org wrote: I’m not sure how it got into this state, but now every time I start typing something or anything like that I get a DrRacket internal error window saying: hash-ref: contract violation expected: hash? given: #f argument position: 1st other arguments...: 'configure-runtime '() context...: /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:450:4: compute-tag+rng method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:47:20 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:56:0: coroutine-run /Applications/Racket/April-16/Racket v6.2.0.2/collects/racket/contract/private/arrow-val-first.rkt:265:18 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:414:4: update-the-strs method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/logging-timer.rkt:41:0: log-timeline/proc /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/timer.rkt:34:38 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:454:6 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:505:32 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:653:3 -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] DrRacket internal error
I’m not sure how it got into this state, but now every time I start typing something or anything like that I get a DrRacket internal error window saying: hash-ref: contract violation expected: hash? given: #f argument position: 1st other arguments...: 'configure-runtime '() context...: /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:450:4: compute-tag+rng method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:47:20 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/coroutine.rkt:56:0: coroutine-run /Applications/Racket/April-16/Racket v6.2.0.2/collects/racket/contract/private/arrow-val-first.rkt:265:18 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/drracket/drracket/private/syncheck/blueboxes-gui.rkt:414:4: update-the-strs method in ...ck/blueboxes-gui.rkt:175:2 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/framework/private/logging-timer.rkt:41:0: log-timeline/proc /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/timer.rkt:34:38 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:454:6 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:505:32 /Applications/Racket/April-16/Racket v6.2.0.2/share/pkgs/gui-lib/mred/private/wx/common/queue.rkt:653:3 -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Debugging Library
I was wondering if Racket, or any other Scheme interpreter, had a debugging library similar to bdb/pdb for Python. There is an environment diagram visualizer at http://www.pythontutor.com/ which uses BDB/PDB to generate a JSON trace which it feeds to the frontend. I see that there is a rudimentary trace, and something more fully featured in DrRacket, but is there any library that can be used by a trace generating program? I want to write a Scheme backend for OPT. Best, Tony -- 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 racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[racket-users] Scribble abstraction to attach styles
I'm having trouble with the type structure of Scribble and hoping someone can
help me get this right.
Let's say I want to write content like this:
=
@exercise{
@question{The expression @code{1 + 2} evaluates to}
@answer{
@itemlist[
@item{@code{2}}
@item{@code{3}}
@item{@code{4}}
]
}
}
=
That is, an `exercise` contains within it a `question` and an `answer` (and
maybe other parts). Each of those can contain compound content (text, code,
itemlists...). In my (HTML) output I would like each of these to have their own
class tags, so the structure looks like
div class=exercise
...
div class=question
...
/div
...
div class=answer
...
/div
...
/div
I have set up styles as follows:
(define exercise-style (make-style exercise null))
(define question-style (make-style question null))
(define answer-style (make-style answer null))
What I'm trying to do is create the correct form of pass-through abstraction
for the `exercise`, `question`, and `answer` functions that just attach the
style and leave everything else alone: e.g.,
(define (exercise . t) (nested-flow exercise-style t))
(define (question . t) (nested #:style question-style t))
I have tried a whole bunch of things (`nested`, `nested-flow`, etc.) and cannot
get anything to work correctly, consistently: each thing I try eventually
results in a contract violation such as
make-nested-flow: contract violation
expected: block?
given: \n
TIA,
Shriram
--
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 racket-users+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
