- Pharo-users - lists.pharo.org

Sending byte array in a JSON format

by Juraj Kubelka

Hi, I was playing with GitHub Gist API and I have queried the following Gist: https://gist.github.com/mbostock/5503544 <https://gist.github.com/mbostock/5503544> I was interested how the PNG image is returned: https://gist.github.com/mbostock/5503544#file-thumbnail-png <https://gist.github.com/mbostock/5503544#file-thumbnail-png> I can obtain the whole Gist executing: STONJSON fromString: (ZnClient new url: 'https://api.github.com/gists/5503544'; accept: 'application/vnd.github.v3+json'; get). I can get PNG contents executing: pngData := (ZnEasy get: ((((STONJSON fromString: (ZnClient new url: 'https://api.github.com/gists/5503544'; accept: 'application/vnd.github.v3+json'; get)) at: 'files') at: 'thumbnail.png') at: 'raw_url')) contents. PNGReadWriter formFromStream: rawPng readStream. But the PNG image is part of the Gist query and can be retrieved by: pngContent := ((((STONJSON fromString: (ZnClient new url: 'https://api.github.com/gists/5503544'; accept: 'application/vnd.github.v3+json'; get)) at: 'files') at: 'thumbnail.png') at: 'content'). "As pngContent is a WideString, I cannot use:" PNGReadWriter formFromStream: pngContent readStream. How can I read the PNG image from the pngContent? Any idea? And the reverse question: How can I send the PNG bytes using JSON format? Thanks! Juraj

April 24, 2017

Re: [Pharo-users] Hot to retrieve values from Nested Dictionaries

by Peter Uhnak

Maybe we could introduce `@` message, so one can chain them and then even execute keyword without parenthesis Dictionary>>@ aKey ^ at: aKey dict @ 'key1' @ 'key2' @ 'key3' dict @ 'key1' @ 'key2' @ 'key3' select: [ :each | ... ] I'm always adding this when hacking around, maybe we could have it in Pharo. Peter On Mon, Apr 24, 2017 at 02:48:48PM -0300, Juraj Kubelka wrote: > > > On Apr 24, 2017, at 14:42, Markus BÃ¶hm <markus.boehm(a)gmail.com> wrote: > > > > May I ask: > > What's the idiomatic way to retrieve values from nested dictionaries? > > > > (((dict1 at: 'key1') at: 'key2') at: 'key3') > > > > Are all the brackets really necessary? > > I think so, without the parenthesis, it is interpreted as one message at:at:at: > > If you use it a lot, you may want to convert the dictionary structure into domain objects. > > Juraj > > > > > BR Mike > >

April 24, 2017

Re: [Pharo-users] Hot to retrieve values from Nested Dictionaries

by Esteban A. Maringolo

For these use cases it would be nice to have some sort of syntax sugar as with the cascade operator, but with a chaining operator instead. The chaining operator would send the message to the result of the previous statement instead of the original receiver as in the semicolon cascade operator (;). E.g. dict1 at: 'key1' : at: 'key2' : at: 'key3' . I selected the colon character in the lack of non-message related characters. It's only a daydream and nothing that I found very often needing, except for cases like the mentioned in this thread, extracting a deeply nested value from a JSON object tree/dictionary. ps: use the extra parenthesis, they're not that many. :) Regards! Esteban A. Maringolo 2017-04-24 14:48 GMT-03:00 Juraj Kubelka <juraj.kubelka(a)icloud.com>: > >> On Apr 24, 2017, at 14:42, Markus BÃ¶hm <markus.boehm(a)gmail.com> wrote: >> >> May I ask: >> What's the idiomatic way to retrieve values from nested dictionaries? >> >> (((dict1 at: 'key1') at: 'key2') at: 'key3') >> >> Are all the brackets really necessary? > > I think so, without the parenthesis, it is interpreted as one message at:at:at: > > If you use it a lot, you may want to convert the dictionary structure into domain objects. > > Juraj > >> >> BR Mike > >

April 24, 2017

Re: [Pharo-users] Hot to retrieve values from Nested Dictionaries

by Markus BÃ¶hm

Tx for advice. P.S.: I got nested dictionaries after JSON API call at wunderground weather API. To see all the response in Pharo inspector "live" is really great :-) BR Mike On Mon, Apr 24, 2017 at 7:51 PM, Cyril Ferlicot D. <cyril.ferlicot(a)gmail.com > wrote: > Le 24/04/2017 Ã 19:42, Markus BÃ¶hm a Ã©crit : > > May I ask: > > What's the idiomatic way to retrieve values from nested dictionaries? > > > > (((dict1 at: 'key1') at: 'key2') at: 'key3') > > > > Are all the brackets really necessary? > > > > BR Mike > > Hi, > > To know if brackets are necessary you can use the "Format" option in > your method. > > Right click -> format > > or cmd/alt/ctrl + shift + f > > In this case you can just write: > > ((dict1 at: 'key1') at: 'key2') at: 'key3'. > > > > -- > Cyril Ferlicot > https://ferlicot.fr > > http://www.synectique.eu > 2 rue Jacques PrÃ©vert 01, > 59650 Villeneuve d'ascq France > >

April 24, 2017

Re: [Pharo-users] Hot to retrieve values from Nested Dictionaries

by Cyril Ferlicot D.

Le 24/04/2017 Ã 19:42, Markus BÃ¶hm a Ã©crit : > May I ask: > What's the idiomatic way to retrieve values from nested dictionaries? > > (((dict1 at: 'key1') at: 'key2') at: 'key3') > > Are all the brackets really necessary? > > BR Mike Hi, To know if brackets are necessary you can use the "Format" option in your method. Right click -> format or cmd/alt/ctrl + shift + f In this case you can just write: ((dict1 at: 'key1') at: 'key2') at: 'key3'. -- Cyril Ferlicot https://ferlicot.fr http://www.synectique.eu 2 rue Jacques PrÃ©vert 01, 59650 Villeneuve d'ascq France

April 24, 2017

Re: [Pharo-users] Hot to retrieve values from Nested Dictionaries

by Juraj Kubelka

> On Apr 24, 2017, at 14:42, Markus BÃ¶hm <markus.boehm(a)gmail.com> wrote: > > May I ask: > What's the idiomatic way to retrieve values from nested dictionaries? > > (((dict1 at: 'key1') at: 'key2') at: 'key3') > > Are all the brackets really necessary? I think so, without the parenthesis, it is interpreted as one message at:at:at: If you use it a lot, you may want to convert the dictionary structure into domain objects. Juraj > > BR Mike

April 24, 2017

Hot to retrieve values from Nested Dictionaries

by Markus BÃ¶hm

May I ask: What's the idiomatic way to retrieve values from nested dictionaries? (((dict1 at: 'key1') at: 'key2') at: 'key3') Are all the brackets really necessary? BR Mike

April 24, 2017

Re: [Pharo-users] [Ann] Pharo Sprint App to improve coordination during Pharo Sprints

by Juraj Kubelka

> On Apr 24, 2017, at 05:29, Esteban Lorenzano <estebanlm(a)gmail.com> wrote: > > Hi, > >> On 24 Apr 2017, at 09:04, Alexandre Bergel <alexandre.bergel(a)me.com> wrote: >> >> Hi! >> >> One very important aspect of Jurajâs work, is that _participants at a sprint should use the sprint tool_. It comes with the latest Pharo image (i.e. what has to be used in a sprint). > > no it doesnât :) > (and it wont, at least this version) > > but yes, everybody should use it ;) Currently, the build system is not integrated with the Pharoâs CI. I do not know if it is going to be useful, but I plan to integrate it in order to find it out :-) Juraj > > >> >> So, letâs use it on Friday! > > +1 > > Esteban > >> >> Cheers, >> Alexandre >> >> >>> On Apr 24, 2017, at 8:05 AM, K K Subbu <kksubbu.ml(a)gmail.com> wrote: >>> >>> On Sunday 23 April 2017 08:43 PM, Juraj Kubelka wrote: >>> >>>> As the Pharo Sprint is organized in several places around the world, we >>>> miss the connection with other guys. For that reason we decided to move >>>> the physical whiteboard to the internet and developed Pharo Sprint App. >>> >>> Excellent idea and a very useful tool! It took me just a few minutes to download it and post my first fix through it. >>> >>> What would be workflow for using this app? Is this only for Pharo Sprint participants or can others also use it? >>> >>> I faced a minor problem in the UI. The top half of login/password text input fields got clipped by title bar, when I opened it up first. Later the Update/Logout buttons also have their top border clipped off. >>> >>> Regards .. Subbu >>> >> >> -- >> _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: >> Alexandre Bergel http://www.bergel.eu >> ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;. >> >> >> >> > >

April 24, 2017

Re: [Pharo-users] Gathering statistics on messages sent to an object

by Alistair Grant

Hi Denis, On Mon, Apr 24, 2017 at 03:48:46PM +0200, Denis Kudriashov wrote: > Hi Alistair. > > Do you know that you are able to count any message send? (not only external). > For this you need prevent meta recursion. Now inside message processing you do: > > aMessage sendTo: anObject > > which produces another intercepting message #perform:withArguments which > repeats original message send. > Fortunately Ghost handles such kind of meta recursion and there is no infinite > loop here: any self-sends are ignored in such cases. > > If you want intercept any message try following code: > > ExternalSendTrace>>send: aMessage to: anObject > | method | > announcer announce: (ExternalSendAnnouncement message: aMessage trace: > self). > method := anObject class lookupSelector: aMessage selector. > ^GHMetaMessages executeWith: anObject andArguments: aMessage arguments > method: method > > > In that case we lookup and execute method by using mirror primitive which not > sends any message to object. > > For example: > > > rect := 10@30 corner: 100@300. > trace := ExternalSendStats logStatsFor: rect. > rect area. > trace stats. > "a Dictionary(#area->1 #height->1 #width->1 )" > > > > Best regards, > Denis Thanks for the exmplanation and code. In this particular case I wanted to specifically exclude internal message sends, as the goal was to find out how other objects called DiskStore, but this will obviously be useful in different situations. Thanks again! Alistair > 2017-04-24 14:43 GMT+02:00 Alistair Grant <akgrant0710(a)gmail.com>: > > If you subscribe to pharo-dev you will have seen that I've been looking > at the primitives used in DiskStore. > > As part of that investigation I wanted to get an idea of which messages > are typically sent to DiskStore and how often. > > Denis Kudriashov provided a neat package that implements a "halt on > next object call". I've been wanting to play with the package for a > while and decided this was a good opportunity. > > I've extended that package to keep count of how many times messages are > sent to a target object, e.g.: > > > > | point trace | > > point := 2@3. > trace := ExternalSendStats logStatsFor: point. > point > x; > y; > angle; > x. > trace stats. > "a Dictionary( > #angle->1 > #x->2 > #y->1 )" > > > > The package is probably too simplistic, and there's bound to be other > ways to do this, but it met my immediate needs and gave me a chance to > try out the Ghost package. I'll extend it if and when I need to. > > Many thanks to Denis for making the Ghost package available, and > hopefully this is useful for someone, or at least triggers some new > ideas. > > Denis' original article is at: http://dionisiydk.blogspot.cz/2016/04/ > halt-next-object-call.html > > The extensions can be installed with: > > Metacello new > baseline: 'AkgGhost'; > repository: 'github://akgrant43/akg-ghost:master/mc'; > load

April 24, 2017

Re: [Pharo-users] [Ann] Pharo Sprint App to improve coordination during Pharo Sprints

by Juraj Kubelka

Hi Subbu, > On Apr 24, 2017, at 03:05, K K Subbu <kksubbu.ml(a)gmail.com> wrote: > > On Sunday 23 April 2017 08:43 PM, Juraj Kubelka wrote: > >> As the Pharo Sprint is organized in several places around the world, we >> miss the connection with other guys. For that reason we decided to move >> the physical whiteboard to the internet and developed Pharo Sprint App. > > Excellent idea and a very useful tool! It took me just a few minutes to download it and post my first fix through it. Thatâs great :-) The idea is having something simple to use. > > What would be workflow for using this app? Is this only for Pharo Sprint participants or can others also use it? The initial idea have raised from the Pharo Sprint events. But you can use the way you want. In other words, by using it, we will find out new workflows :-) It should be clear that âPharo Sprint participantsâ are not meant to be physically available in Lille, France or Santiago, Chile. > > I faced a minor problem in the UI. The top half of login/password text input fields got clipped by title bar, when I opened it up first. Later the Update/Logout buttons also have their top border clipped off. Please, can you send me a screenshot? Or submit the screenshot here https://github.com/JurajKubelka/PharoSprint/issues/new <https://github.com/JurajKubelka/PharoSprint/issues/new> Thanks! Juraj > > Regards .. Subbu >

April 24, 2017