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Re: [Pharo-users] Small query about ZnClient post - with "; " form values

by Tim Mackinnon

Thanks for chipping in Sven - Iâd asked Ben for some help as Iâd seen him on discord - that solution does indeed work. See: http://dpaste.com/218RW5G <http://dpaste.com/218RW5G> (which isnât bad - not sure about he red boxes around things, but the smalltalk highlighting is quite good (pygments I think), although there is another one that exercism use - whose name evades me). This same example doesnât work on Stfx - I get a 400 error, which I assumed was size, although 2k should give you a decent chunk of text - but I guess showing a package of code or a stack trace does blow through that. Hence my investigation of other tools like dPaste, pastebin and paste.ee. As a related question - how would I know to use #addPart: vs: #formAt: ? As our questions indicated - formAt: works for most things until you hit fields with $; in them (which I was suprised wasnât just encoded when sent in the form). The docs at dPaste are quite minimal - http://dpaste.com/api/v2/ <http://dpaste.com/api/v2/> which is why I didnât think of multi-part, so what would guide me down that route? Tim > On 17 May 2019, at 09:39, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > Tim, > >> On 17 May 2019, at 03:04, Tim Mackinnon <tim(a)testit.works> wrote: >> >> I was trying to automate posting some values to a website (I would use Stfx.eu but it doesnât do syntax highlighting and only seems to work for quite small amounts). > > Hmm, it does highlighting (but it is far from perfect). > > There is indeed a limit to the upload size, 2048 bytes. > > I answered Ben for the same problem, I believe, the solution being > > http://ws.stfx.eu/QZTOS3HQAAPS > > Regards, > > Sven > >> Anyway the following code always seems to trim values that have a ; in them - and Iâm wondering if Iâm missing something - or if its the endpoint that has an issue (although curl seems to work fine). >> >> content := 'hello world; hello'. >> ZnClient new >> systemPolicy; >> beOneShot; >> url: 'http://dpaste.com/api/v2/'; >> formAt: 'title' put: 'my; title'; >> formAt: 'syntax' put: 'smalltalk'; >> formAt: 'expiry_days' put: '5'; >> formAt: 'content' put: content; >> post. >> >> Tim > >

May 17, 2019

Re: [Pharo-users] can I do this with a stream or a format

by Sven Van Caekenberghe

I would make that ^ String new: gifts size * 10 streamContents: [ :stream | gifts allButLastDo: [:each | stream nextPutAll: each; nextPutAll: ', ']. stream nextPutAll: 'and '; nextPutAll: gifts last ] Your iteration is well done, clear and to the point. > On 17 May 2019, at 02:44, Richard O'Keefe <raoknz(a)gmail.com> wrote: > > stream := WriteStream on: (String new: gifts size * "estimated size per gift" 10). > "The number after #new: is the *initial* allocation; the stream will reallocate it > as needed." > gifts allButLastDo: [:each | > stream nextPutAll: each; nextPutAll: ', ']. > stream nextPutAll: 'and '; nextPutAll: gifts last. > ^stream contents > Using #allButLastDo: saves making a copy of (most of) gifts. > How could you find out about these things? > > You want to join some strings, so you look for a "join" method in String and you > will find > > join: aCollection > ^ self class new: (aCollection size * self size) streamContents: [:stream | > aCollection > do: [:each | stream nextPutAll: each asString] > separatedBy: [stream nextPutAll: self]] > > > You might wonder if there is already something close to what you want, so you > might enter "commas" into Spotter. If you did that, you would find > Collection>>asCommaStringAnd so that the whole thing is very nearly > gifts asCommaStringAnd > > Just as the concatenation selector #, works with most kinds of sequences, > so building sequences up using a WriteStream works with most kinds of sequences. > > Let's work through a little example. We are just going to build up the string > 'Quick' one character at a time. > s := ''. > s := s , 'Q'. "creates a new string holding 'Q'" > s := s , 'u'. "creates a new string holding 'Qu'" > s := s , 'i'. "creates a new string holding 'Qui'" > s := s , 'c'. "creates a new string holding 'Quic'" > s := s , 'k'. "creates a new string holding 'Quick'" > > You see that building a string of n characters will actually create n new strings, > all but the last of which will be thrown away, taking O(n**2) time. > > Now let's use a stream. > w := WriteStream on: (String new: 4). "Yes, I know that's too small." > w nextPutAll: 'Q'. "The stream now holds 'Q...' in its buffer." > w nextPutAll: 'u'. "The stream now holds 'Qu..' in its buffer." > w nextPutAll: 'i'. "The stream now holds 'Qui.' in its buffer." > w nextPutAll: 'c'. "The stream now holds 'Quic' in its buffer." > s nextPutAll: 'k'. "There is no room left in the buffer, so the stream allocates > a new buffer twice the size and copies the old one into it. > Now it has 'Quic....' and it has room. > The stream now holds 'Quick...' in its buffer." > s := w contents. "We are asking for the defined elements of the buffer. > This means s := buffer copyFrom: 1 to: w position." > > You see that building a string of n characters this way requires a minimum of > two strings, the buffer and the final result. The buffer may be periodically > resized, but growing by doubling means the average cost is still O(n). > > Let's time these to get an idea. > Time millisecondsToRun: [ > |s| > s := ''. > 1 to: 10000 do: [:i | > s := s , i printString]. > s size] > => 124 > Time millisecondsToRun: [ > |w| > w := WriteStream on: (String new: 10000). > 1 to: 10000 do: [:i | > w nextPutAll: i printString]. > w contents size] > => 7 > > This is exactly the reason that Java has both String and StringBuilder. > The tragedy of Java (well, not the only one) is that they had the example > of Smalltalk before them, showing very very clearly that the best way to > handle object to text conversion is to use #printOn: as the primitive, > not #printString, and they *still* went ahead and did the worse thing. > (Ruby has even less excuse for privileging to_s.) > > There are quite a few books about Smalltalk available as free PDFs from > the Pharo web site, a wonderful resource. The Blue Book (Smalltalk-80 > The Language and its Implementation) describes streams in Chapter 12. > > > On Fri, 17 May 2019 at 07:21, Roelof Wobben <r.wobben(a)home.nl> wrote: > Hello, > > Im testing all my solutions with critiz and can solve almost all problems, > > Only this one I cannot figure out. > > I have this code > (gifts allButLast > inject: '' > into: [ :str :each | str , each , ', ' ]) , 'and ' , gifts last ] > > and critiz says I should use a stream . > > How can I make this work ? > > Roelof > >

May 17, 2019

Re: [Pharo-users] Small query about ZnClient post - with "; " form values

by Sven Van Caekenberghe

Tim, > On 17 May 2019, at 03:04, Tim Mackinnon <tim(a)testit.works> wrote: > > I was trying to automate posting some values to a website (I would use Stfx.eu but it doesnât do syntax highlighting and only seems to work for quite small amounts). Hmm, it does highlighting (but it is far from perfect). There is indeed a limit to the upload size, 2048 bytes. I answered Ben for the same problem, I believe, the solution being http://ws.stfx.eu/QZTOS3HQAAPS Regards, Sven > Anyway the following code always seems to trim values that have a ; in them - and Iâm wondering if Iâm missing something - or if its the endpoint that has an issue (although curl seems to work fine). > > content := 'hello world; hello'. > ZnClient new > systemPolicy; > beOneShot; > url: 'http://dpaste.com/api/v2/'; > formAt: 'title' put: 'my; title'; > formAt: 'syntax' put: 'smalltalk'; > formAt: 'expiry_days' put: '5'; > formAt: 'content' put: content; > post. > > Tim

May 17, 2019

Re: [Pharo-users] Zinc - multipart forms query

by Sven Van Caekenberghe

Hi Ben, Try: ZnClient new systemPolicy; beOneShot; url: 'http://dpaste.com/api/v2/'; addPart: (ZnMimePart fieldName: 'syntax' value: 'smalltalk'); addPart: (ZnMimePart fieldName: 'content' value: 'hello; world'); post. Although curl is powerful, well known and well supported, I would not say it is a great standard for interface design, it is way too complex. Zn tries to approach HTTP from an object design standpoint. You pass along a ZnMultiPartFormDataEntity object that contains ZnMimeParts as entity to your POST request. Sven > On 17 May 2019, at 05:26, Ben Coman <btc(a)openinworld.com> wrote: > > We are trying to replicate the following in Pharo... > $ echo "hello; world" | curl -s -F "syntax=smalltalk" -F "content=<-" http://dpaste.com/api/v2/ > > like this... > url := ZnClient new > logToTranscript; > systemPolicy; > beOneShot; > url: 'http://dpaste.com/api/v2/'; > formAt: 'syntax' put: 'smalltalk'; > formAt: 'content' put: 'hello; world'; > post. > > Curl produces... "hello; world" > http://dpaste.com/2Y15WGY > but Zinc produces only... "hello" > http://dpaste.com/28E974Y > > The difference is apparent on the wire... > With curl... > <image.png> > > With Zinc... > <image.png> > > The curl manpage says... > -F, --form <name=content> > For HTTP protocol family, this lets curl emulate a filled-in form in which > a user has pressed the submit button. This causes curl to POST data > using the Content-Type multipart/form-data according to RFC 2388. > > So we've used multipart forms elsewhere already... > https://github.com/exercism/pharo-smalltalk/blob/4a88c397/dev/src/ExercismT… > https://github.com/exercism/pharo-smalltalk/blob/4a88c397/dev/src/ExercismT… > https://github.com/exercism/pharo-smalltalk/blob/9c6b91aaf/dev/src/Exercism… > https://github.com/exercism/pharo-smalltalk/blob/0e0bd82ed/dev/src/Exercism… > > so I'm sure we can achieve what we want, just curious if there might be > any convenience methods that could be used similar to the examples > given on the rest of curl's "-F" description. > Or if there could be? Curl examples are often used for reference by APIs (http://dpaste.com/api/v2/) > and a close map between curl and Zinc would be really great. > > cheers -ben > > P.S. I even wonder if a ZnCurl would be useful that parsed curl strings. > This would firstly provide ease of use for newcomers, > and secondly define how to map through to native Zinc methods.

May 17, 2019

Pharo Launcher could select newly created image (to be played) by default

by Christopher Fuhrman

I posted a feature request at https://github.com/pharo-project/pharo-launcher/issues/339

May 17, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Richard O'Keefe

I did not mean "course of instruction on the topic of continuations", I meant "that class whose name is Continuation in the Smalltalk image." In a Playground, type Continuation and then Control-B. On Fri, 17 May 2019 at 14:03, Brainstorms <wild.ideas(a)gmail.com> wrote: > Richard O'Keefe wrote > > Blocks in current Smalltalk system are just like lambdas in Scheme. > > Pharo even has continuations (see the Continuation class). > > I was going to ask about coroutines and continuations, but I thought maybe > bringing these subjects up in another thread would be more appropriate. > (This forum is also new to me. More so than Smalltalk & Pharo.) > > Is the "Continuation class" part of the MOOC series? Or a class held at > the > ESUG conference? I don't recall running across anything referring to the > subject. > > -t > > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > >

May 17, 2019

Zinc - multipart forms query

by Ben Coman

We are trying to replicate the following in Pharo... $ echo "hello; world" | curl -s -F "syntax=smalltalk" -F "content=<-" http://dpaste.com/api/v2/ like this... url := ZnClient new logToTranscript; systemPolicy; beOneShot; url: 'http://dpaste.com/api/v2/'; formAt: 'syntax' put: 'smalltalk'; formAt: 'content' put: 'hello; world'; post. Curl produces... "hello; world" http://dpaste.com/2Y15WGY but Zinc produces only... "hello" http://dpaste.com/28E974Y The difference is apparent on the wire... With curl... [image: image.png] With Zinc... [image: image.png] The curl manpage says... -F, --form <name=content> For HTTP protocol family, this lets curl emulate a filled-in form in which a user has pressed the submit button. This causes curl to POST data using the Content-Type multipart/form-data according to RFC 2388. So we've used multipart forms elsewhere already... https://github.com/exercism/pharo-smalltalk/blob/4a88c397/dev/src/ExercismT… <https://github.com/exercism/pharo-smalltalk/blob/4a88c397e550f1319b7be4dbff…> https://github.com/exercism/pharo-smalltalk/blob/4a88c397/dev/src/ExercismT… <https://github.com/exercism/pharo-smalltalk/blob/4a88c397e550f1319b7be4dbff…> https://github.com/exercism/pharo-smalltalk/blob/9c6b91aaf/dev/src/Exercism… <https://github.com/exercism/pharo-smalltalk/blob/9c6b91aa9fd10ae1efdfa779e0…> https://github.com/exercism/pharo-smalltalk/blob/0e0bd82ed/dev/src/Exercism… <https://github.com/exercism/pharo-smalltalk/blob/0e0bd82ed74c9966d2375d9392…> so I'm sure we can achieve what we want, just curious if there might be any convenience methods that could be used similar to the examples given on the rest of curl's "-F" description. Or if there could be? Curl examples are often used for reference by APIs ( http://dpaste.com/api/v2/) and a close map between curl and Zinc would be really great. cheers -ben P.S. I even wonder if a ZnCurl would be useful that parsed curl strings. This would firstly provide ease of use for newcomers, and secondly define how to map through to native Zinc methods.

May 17, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Brainstorms

Richard O'Keefe wrote > Blocks in current Smalltalk system are just like lambdas in Scheme. > Pharo even has continuations (see the Continuation class). I was going to ask about coroutines and continuations, but I thought maybe bringing these subjects up in another thread would be more appropriate. (This forum is also new to me. More so than Smalltalk & Pharo.) Is the "Continuation class" part of the MOOC series? Or a class held at the ESUG conference? I don't recall running across anything referring to the subject. -t -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

May 17, 2019

Re: [Pharo-users] Bloc of code in tiers programming language

by Richard O'Keefe

Blocks in current Smalltalk system are just like lambdas in Scheme. Pharo even has continuations (see the Continuation class). On Fri, 17 May 2019 at 05:21, Brainstorms <wild.ideas(a)gmail.com> wrote: > I beg your pardon.. and thank you for being the first to draw my attention > to > the fact that the phrase (a common enough American colloquialism) is > actually a logical fallacy. Until now, it's been strictly idiomatic to me. > > And thank you for your prompt reply. > > Am I safe to assume that blocks in Smalltalk, as with Lua, capture their > locally-scoped variables (referred to in Lua as "non-local variables") for > correct evaluation in other contexts, such as when blocks are passed as > arguments and return values? I.e., cases where the local variables of a > method have gone out of scope and no longer exist, yet are referenced > within > the block at some future time when evaluated. I expect so; I just haven't > seen it described in this detail. > > -t > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > >

May 17, 2019

Small query about ZnClient post - with "; " form values

by Tim Mackinnon

I was trying to automate posting some values to a website (I would use Stfx.eu but it doesnât do syntax highlighting and only seems to work for quite small amounts). Anyway the following code always seems to trim values that have a ; in them - and Iâm wondering if Iâm missing something - or if its the endpoint that has an issue (although curl seems to work fine). content := 'hello world; hello'. ZnClient new systemPolicy; beOneShot; url: 'http://dpaste.com/api/v2/'; formAt: 'title' put: 'my; title'; formAt: 'syntax' put: 'smalltalk'; formAt: 'expiry_days' put: '5'; formAt: 'content' put: content; post. Tim

May 17, 2019