August 2019 - Pharo-users - lists.pharo.org

SequenceableCollection>>#allButFirst: inconsistence across subclasses

by Julien

Hello, I opened that issue: https://github.com/pharo-project/pharo/issues/4442 <https://github.com/pharo-project/pharo/issues/4442> And I think to fix it we need to actually discuss about what we want. #allButFirst: behaves differently depending on the actual type of sequenceable collection when argument is greater than collection size. For instance: #(1 2) allButFirst: 3. "PrimitiveFailed signaled" (LinkedList with: 1 with: 2) allButFirst: 3. "PrimitiveFailed signaled" (OrderedCollection with: 1 with: 2) allButFirst: 3. "an OrderedCollection() Â» The question is then, who is right? Should #allButFirst: with an argument greater than the collection size raise an error Or Should #allButFirst: with an argument greater than the collection size returns an empty collection ? I asked a few people about it @ ESUG and it appears that the expected behaviour from #allButFirst: is not the same to all people. We need to decide so we improve consistence of collections. And then, we need to document that with a test :-). Cheers. Julien --- Julien Delplanque Doctorant Ã lâUniversitÃ© de Lille http://juliendelplanque.be/phd.html Equipe Rmod, Inria BÃ¢timent B 40, Avenue Halley 59650 Villeneuve d'Ascq NumÃ©ro de tÃ©lÃ©phone: +333 59 35 86 40

Aug. 30, 2019

Re: [Pharo-users] how to open a system browser on a environment?

by Bernardo Ezequiel Contreras

thanks, but nop. (i downloaded drgeo and tested that expression) i want to open the system browser with my project's packages, only that. thanks again. On Thu, Aug 29, 2019 at 9:16 AM Hilaire <hilaire(a)drgeo.eu> wrote: > On DrGeo based on P7, I do this: > > Smalltalk tools browser openOnClass: DrGeoSketch > > Hope it help. > > Hilaire > > -- > Dr. Geo > http://drgeo.eu > > > > -- Bernardo E.C. Sent from a cheap desktop computer in South America.

Aug. 30, 2019

Re: [Pharo-users] how to open a system browser on a environment?

by Hilaire

On DrGeo based on P7, I do this: Smalltalk tools browser openOnClass: DrGeoSketch Hope it help. Hilaire -- Dr. Geo http://drgeo.eu

Aug. 29, 2019

how to open a system browser on a environment?

by Bernardo Ezequiel Contreras

hi, i used to open a system browser with an environment i built the following environment earleyEnvironment | packageNames | packageNames := OrderedCollection with: BaselineOfEarleyParser package packageName. packageNames addAll: (BaselineOfEarleyParser project version packages collect: [ :each | each name ]). ^ (RBBrowserEnvironment new forPackageNames: packageNames) label: 'Earley Parser Environment'; yourself and then i opent the system browser with it "protocol: environment" openBrowserInEarleyEnvironment ^ (Smalltalk tools browser browsedEnvironment: self earleyEnvironment) open now, i dont know how to do it with the new browser. any hints? suggestions? thanks. -- Bernardo E.C. Sent from a cheap desktop computer in South America.

Aug. 29, 2019

Re: [Pharo-users] Connection Timed Out

by horrido

I did a bit of research on the web and I discovered that nginx can be unreliable due to default or inappropriate settings for certain timeout values. Currently, I'm testing a possible fix: set /keepalive_timeout/ to 90, rather than the default 65. So far, it seems to work, but I need further testing. Ben Coman wrote > On Wed, 28 Aug 2019 at 03:12, Richard Kenneth Eng < > horrido.hobbies@ > > > wrote: > >> I have a Teapot application running under Linux and nginx. From time to >> time, I get the following error: *ConnectionTimedOut: Data receive timed >> out.* >> >> Otherwise, the Teapot application works fine, even with this error >> message. >> >> Can anyone tell me what or where it's timing out, and how can I change >> the >> timeout value? >> > > I'm not familiar with Teapot, but a screen snapshot might help. > Hopefully someone else has some ideas. > > cheers -ben -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

Aug. 28, 2019

Re: [Pharo-users] Connection Timed Out

by Ben Coman

On Wed, 28 Aug 2019 at 03:12, Richard Kenneth Eng <horrido.hobbies(a)gmail.com> wrote: > I have a Teapot application running under Linux and nginx. From time to > time, I get the following error: *ConnectionTimedOut: Data receive timed > out.* > > Otherwise, the Teapot application works fine, even with this error message. > > Can anyone tell me what or where it's timing out, and how can I change the > timeout value? > I'm not familiar with Teapot, but a screen snapshot might help. Hopefully someone else has some ideas. cheers -ben

Aug. 28, 2019

Connection Timed Out

by Richard Kenneth Eng

I have a Teapot application running under Linux and nginx. From time to time, I get the following error: *ConnectionTimedOut: Data receive timed out.* Otherwise, the Teapot application works fine, even with this error message. Can anyone tell me what or where it's timing out, and how can I change the timeout value? Thanks.

Aug. 27, 2019

Re: [Pharo-users] [ANN] Iterators

by Julien

> Le 24 aoÃ»t 2019 Ã 09:29, Steffen MÃ¤rcker <merkste(a)web.de> a Ã©crit : > > Hi Julien, Hello Steffen, > > nice work! Could you please tell how your approach is related to > transducers from the user perspective and technically? > (https://github.com/Pharophile/Transducers) It is quite similar, except that I actually started it the other way around: - First I wanted objects that can iterate on data structure (or any object) - Second I wanted object to eventually provide multiple iterators in order to walk them in multiple ways - Third I came with the IteratorWithCollectionAPI decorator which implements #select:, #collect: and so one in order to avoid re-implementing these methods on objects wrapping a collection - Since IteratorWithCollectionAPI is a decorator, I came up with the idea to push further the composition feature and at this point, I get Iterators to be similar to Transducer The original idea of Iterators can be summarised as: myObjectThatShouldImplementCollectionButIsNotACollection iterator collect: #foo. myObjectThatShouldImplementCollectionButIsNotACollection iterator do: #foo. myObjectThatShouldImplementCollectionButIsNotACollection iterator doWithIndex: #foo. â¦ Technically I donât know what are the similarities as I did not dig in Transducers implementation. >From the DSL design point of view, I wanted that the composition through binary messages keeps the data flow to go from top left to down right when you read the code. This gave me the idea to mimic shell language for stream manipulation. Hope it answers your questions. Cheers, Julien

Aug. 25, 2019

Re: [Pharo-users] Putting checkboxes in ListPresenter

by Richard Sargent

Thank you, Renaud, for explaining that. I am so glad to see that Pharo has addressed this and made it so simple. I've seen too many UIs that fail on this kind of thing. Kudos to those people who created this. You nailed it! On Sat, Aug 24, 2019, 18:31 Renaud de Villemeur <renaud.devillemeur(a)free.fr> wrote: > Hi Steve. > > This is not at all a naive question. This is partly showned in the advance > part of spec, and as it said: "ListModel can show more than just text, it > can also visualize any kind of widget." > > Here is how you could do a static list of checkBox: > In your initializeWidget method, create your checkbox: > > item1 := self newCheckBox label: 'label1'; help: 'help1'; yourself. > item2 := self newCheckBox label: 'label2; help: 'help2'; yourself. > item3 := self newCheckBox label: 'label3'; help: 'help3'; yourself. > > You can then create and display your list: > > projectList := (self instantiate: ListPresenter) > displayBlock: [ :x | x buildWithSpec ]; > items: {item1 . item2 . item3}; > yourself. > > > And your defaultSpec can be as simple as: > > defaultSpec [ > ^ SpecLayout composed > add: #projectList; > yourself > ] > > Hope this helps. > Renaud > > > Le sam. 24 aoÃ»t 2019 Ã 14:53, Steve Quezadas <steveeq1(a)gmail.com> a > Ã©crit : > >> Guys, >> >> I am learning this new "spec" thing. I created a simple Spec "list" >> object with the following code: >> arbitraryList := ListPresenter new. >> arbitraryList >> items: #('one' 'two' 'three' 'four. . .'); >> title: 'Arbitrary list'. >> arbitraryList openWithSpec. >> >> Which creates a simple list like follows: >> https://steverstuff.s3.amazonaws.com/arbitrary_list.png >> >> Is there any way to make a SpecPresenter object with an arbitrary list of >> checkboxes? Kind of like a check-off list? >> >> What is the best way of doing this? Should I put checkbox objects in the >> "items:" selector? Or is there another way to do it? >> >> Please forgive the naive question. >> >

Aug. 25, 2019

Re: [Pharo-users] [ANN] Iterators

by Richard O'Keefe

Distinguishing between "pull-based" and "push-based" streams in Smalltalk makes no sense, because do: aBlock [self atEnd] whileFalse: [aBlock value: self next]. is in the same <gettableStream> protocol in the ANSI standard as #atEnd and #next, and in most Smalltalk systems it is in Stream. There should never be anything that has #atEnd and #next that doesn't have #do:. In some Smalltalk systems, Stream and Collection both inherit from a common superclass. In GNU Smalltalk, it's called Iterable, and provides, amongst other things stream1 , stream2 stream allSatisfy: filterBlock stream anySatisfy: filterBlock stream collect: transformBlock stream count: filterBlock stream detect: filterBlock stream detect: filterBlock ifNone: exceptionBlock stream do: actionBlock stream do: actionBlock separatedBy: separatorBlock stream fold: combinerBlock stream inject: initial into: combinerBlock stream noneSatisfy: filterBlock stream reject: filterBlock stream select: filterBlock My Smalltalk library does not do that, but it does have an Enumerable class that's somewhat similar (the distinction is that multiple traversal of a Collection must work, but only single traversal of an Enumerable is required), so readStream asEnumerable reject: filterBlock This makes about 257 Enumerable methods available. Combinators are good, but they should fit in with existing naming conventions. *Arbitrary* overloadings are a bad idea. The pipe "|" allows one to chain iterators - The ">" allows one to create a new collection with data transformed through chained iterators - The ">>" allows one to fill an existing collection with data transformed through chained iterators The vertical bar is used in Smalltalk for "or". It would make sense to have MonadicBlock methods for: 'combinators' | other ^[:x | (self value: x) | (other value: x)] and so on. Smalltalk already has a selector that means "concatenation", namely #, so stream1 , stream2 as in GNU Smalltalk would not be too confusing. Similarly, ">" means "greater than", and it would be deeply confusing to use it for some sort of data construction. We would expect stream1 > stream2 iff the future values of stream1 (as a sequence) are lexicographically greater than the future values of stream2 (as a sequence). Or you could argue for "the relative order of two streams is the relative order of their positions if the have the same underlying Collection or file system object, otherwise undefined".

Aug. 25, 2019