- Pharo-users - lists.pharo.org

Re: [Pharo-users] How to migrate an object to a subclass of its class but with new inst vars ?

by Steven Costiou

Hmm ok, but can i easily make b become a again later ? I guess i would just need to instanciate a new a... But would it not be faster to just change the class (which finally works with a little tuning) ? I can't test right now but i will compare the two things... Le 2017-06-07 21:59, Denis Kudriashov a Ã©crit : > 2017-06-07 16:43 GMT+02:00 Steven Costiou <steven.costiou(a)kloum.io>: > >> Yes but when you do that you loose all the states from "a" (at least the values). You have to do state migration management... > > You just need extra step to copy all state from old object: > >> b := B new. > >> b copyFrom: a. > >> a becomeForward: b.

June 7, 2017

Re: [Pharo-users] Porting Transducers to Pharo

by phil＠highoctane.be

Hi Steffen, I have created a repo on Github with the code and added you as an admin on it as well. https://github.com/Pharophile/Transducers I've put a README. md with your notes, and under packages/ you'll find 3 packages: Transducers-Core Transducers-Examples Transducers-Tests Tests is empty and Examples has the example from the mailing list. I ran the Renraku quality assistant tool and there are a few issues in the package. I did all of this in a Pharo 6 image using Iceberg. [image: Inline image 1] I guess that you can clone the repo using the Origin you see in the screenshot. I used https out of lazyness because I didn't wanted to deal with ssh keys etc. Tell me how it goes for you. I read your note about DoubleAgents for the tests, well, yeah this one we do not have. I read about it on the blog of its maker and it looked decent indeed. For the critics browser, it goes like this: [image: Inline image 2] Then look at the warnings. A bunch of them are non issues but there are Undeclared things in need of a fix (e.g. IndexNotFoundError) Best, Phil On Wed, Jun 7, 2017 at 11:29 AM, Steffen MÃ¤rcker <merkste(a)web.de> wrote: > Hi Phil, > > that's great. I do have a GitHub account (merkste) but none at > SmalltalkHub. Is there a recommendable doc on how to use Git from Pharo? > > Best, Steffen > > > > Am .06.2017, 14:09 Uhr, schrieb phil(a)highoctane.be <phil(a)highoctane.be>: > > Hi Steffen, >> >> I am willing to help you create the package in SmalltalkHub or Github >> based >> on your files/changeset. >> >> Do you have a github and/or SmalltalkHub account? >> >> Best, >> Phil >> >> >> On Tue, Jun 6, 2017 at 1:08 PM, Steffen MÃ¤rcker <merkste(a)web.de> wrote: >> >> Hi! >>> >>> If the need arises, we could of course factor the compact notation out >>> into >>> >>>> a separate package. >>>>> >>>>> Good idea >>>> [...] I do not want to help promoting a syntax that alienates me (and >>>> others because other people reported the saem to me). >>>> >>>> >>> I understand. Btw, I'd really, really appreciate if others post their >>> thoughts and feedback here as well. Discussion helps moving things >>> forward. >>> =) >>> >>> >>> (collection transduce map: #squared) take: 1000. >>> >>>> >>>>> >>>> To me this is much more readable. >>>> >>>> >>> Well, I'll provide that extension once it is finished. >>> >>> I cannot and do not want to use the other forms. >>> >>>> >>>> >>> >>> collection transduce >>> >>>> map: #squared; >>>>> take: 1000. >>>>> >>>>> But as the message chain has to modify the underlying object >>>>> (an eduction), very snaky side effects my occur. E.g., consider >>>>> >>>>> eduction := collection transduce. >>>>> squared := eduction map: #squared. >>>>> take := squared take: 1000. >>>>> >>>>> Now, all three variables hold onto the same object, which first squares >>>>> all elements and than takes the first 1000. >>>>> >>>>> >>>> This is because the programmer did not understand what he did. No? >>>> >>>> >>> Sure. ;-) Nevertheless, it would be very hard to debug. All of which are >>> the reasons I wouldn't implement that variant. ;-) >>> >>> >>> PS: I played with infinite stream and iteration back in 1993 in CLOS. >>> >>>> Now I do not like to mix things because it breaks my flow of thinking. >>>> >>>> >>> >>> I am not sure whether I understand what your mean by mixing. Concerning >>> transducers, the ability to handle infinite sources in only a (natural) >>> side-effect of the ability to finish reductions before all elements are >>> processed, e.g., like #detect: and such. >>> >>> Best, Steffen >>> >>> >>> >>> >>> >>> > >

June 7, 2017

Re: [Pharo-users] How to migrate an object to a subclass of its class but with new inst vars ?

by Denis Kudriashov

2017-06-07 16:43 GMT+02:00 Steven Costiou <steven.costiou(a)kloum.io>: > Yes but when you do that you loose all the states from "a" (at least the > values). You have to do state migration management... You just need extra step to copy all state from old object: b := B new. b copyFrom: a. a becomeForward: b.

June 7, 2017

Re: [Pharo-users] is it related to Freetype or Athens?

by Peter Uhnak

On Tue, Jun 06, 2017 at 07:33:04PM +0200, Hilaire wrote: > Hi there, > > A Dr. Geo user on Ubuntu 64bits 16.04 got that buggy rendering of the > canvas, then on some situation the rendering completely stop on a red > screen, with a stack showing may be a zero divide error. I did not get > access to the PharoDebog yet. > > Fonts on the screenshot is not right too. Could it be a mixed problem > between FreeType and Cairo? Any first though on the issue welcome. There were couple GC/memory related issues in the VM's plugin, that were fixed or worked around in the Pharo 6 VM that apparently were present for a long time... so maybe that's also part of what you've experienced...

June 7, 2017

MD5 is broken (Cryptography)

by casimiro barreto

MD5 (non primitive and with primitive) is broken because it relies on the conversion of Character to SmallInteger so the method shiftBits: Problem happens at ThirthyTwoBitRegister>>reverseLoadFrom:at: which is called from MD5NonPrimitive>>proccessBuffer: Error is: Instance of Character did not understand #bitShift and happened at: reverseLoadFrom: aByteArray at: index "Load my 32-bit value from the four bytes of the given ByteArray starting at the given index. Consider the first byte to contain the most significant bits of the word (i.e., use big-endian byte ordering)." hi := ((aByteArray at: index + 3) bitShift: 8) + ( aByteArray at: index + 2). low := ((aByteArray at: index + 1) bitShift: 8) + ( aByteArray at: index). -- The information contained in this message is confidential and intended to the recipients specified in the headers. If you received this message by error, notify the sender immediately. The unauthorized use, disclosure, copy or alteration of this message are strictly forbidden and subjected to civil and criminal sanctions.

June 7, 2017

Re: [Pharo-users] RewriteToolbuilder question

by werner kassens

On 06/07/2017 08:11 PM, Mark Rizun wrote: > At first, I was not able to reproduce the error, but then I realised > that you probably don't save the content of lower left and right parts > (`@.Statements).Use cmd+s to save changes. > The error is raised because parser tries to parse the old code (same > as in upper left part) with a method intended for rewrite rules. > That should fix it. > If you have any other questions related to RewriteTool don't hesitate > to ask. Thank you, Mark. werner

June 7, 2017

Re: [Pharo-users] RewriteToolbuilder question

by Mark Rizun

At first, I was not able to reproduce the error, but then I realised that you probably don't save the content of lower left and right parts (`@.Statements).Use cmd+s to save changes. The error is raised because parser tries to parse the old code (same as in upper left part) with a method intended for rewrite rules. That should fix it. If you have any other questions related to RewriteTool don't hesitate to ask. 2017-06-07 19:25 GMT+02:00 werner kassens <wkassens(a)libello.com>: > Hi Mark, > the code from Number>>raisedTo: > > aNumber isInteger ifTrue: [ > "Do the special case of integer power" > ^ self raisedToInteger: aNumber]. > aNumber isFraction ifTrue: [ > "Special case for fraction power" > ^ (self nthRoot: aNumber denominator) raisedToInteger: aNumber > numerator ]. > self < 0 ifTrue: [ > ^ ArithmeticError signal: 'Negative numbers can''t be raised to > float powers.' ]. > 0 = aNumber ifTrue: [^ self class one]. "Special case of exponent=0" > 1 = aNumber ifTrue: [^ self]. "Special case of exponent=1" > 0 = self ifTrue: [ "Special case of self = 0" > aNumber < 0 > ifTrue: [^ (ZeroDivide dividend: self) signal] > ifFalse: [^ self]]. > ^ (aNumber * self ln) exp "Otherwise use logarithms" > > Werner > > p.s. Hi Ben, <g> yes, i wrote that email a bit too fast, the video from > http://www.screencast.com/t/LCEl0hFl > > On 06/07/2017 07:03 PM, Mark Rizun wrote: > > Hi Werner, > > I believe that I am the one to answer this question, but I need more > information. > Please, could you send the code that you have in upper left panel. > > Cheers, > Mark > > 2017-06-07 18:46 GMT+02:00 Ben Coman <btc(a)openinworld.com>: > >> I don't know much about RewriteToolbuilder, so probably won't be the one >> to give a proper answer, >> but to help someone else answer... could you narrow down which video >> with a link? >> >> cheers -ben >> >> On Thu, Jun 8, 2017 at 12:05 AM, werner kassens <wkassens(a)libello.com> >> wrote: >> >>> Hi, >>> i followed the video and opened the RewriteToolbuilder on some code in >>> pharo4.0. i then tried to keep things simple and made a >>> transformationrule,which i thought would not change anything, by just >>> copying "â@.Statements." <â@.Statements.> into the lower left & right >>> panels (without the " of course).i then press 'generate rule' and get a >>> 'Syntax Error: end of Statement list encountered' with this specification: >>> ^ ArithmeticError signal: 'Negative numbers canEnd of statement list >>> encountered -> ''t be raised to float powers.' . but this part of the code >>> in the upper left panel is just a copy of some unchanged standard pharo4.0 >>> code. where did i go wrong? >>> werner >>> >>> >>> >> > >

June 7, 2017

Re: [Pharo-users] [Pharo-dev] PharoDays17 Slides and some Videos

by Ben Coman

On Wed, Jun 7, 2017 at 10:24 PM, Marcus Denker <marcus.denker(a)inria.fr> wrote: > Hi, > > I have uploaded the Slides and Videos of PharoDays2017. Slides are > complete (minus those > talks that were due demos). For the Videos we have right now 8 talks and > the âShow Us Your > Projectâ session. More might come in the future (I need to check). > > Slides: > - https://www.slideshare.net/pharoproject/presentations > - http://files.pharo.org/conferences/2017PharoDays/ > > PlayList: https://www.youtube.com/playlist?list=PL4actYd6bfnw7ous5We- > XnWq0NZquP3gM > > > I liked the UI metalinks on mouse clicks. Now what would be really cool is a metalink to bring up a debugger for the next click on a button, to help learn how the system implements that feature. cheers -ben

June 7, 2017

Re: [Pharo-users] Some Metacello issue

by Dale Henrichs

On 06/07/2017 03:46 AM, Holger Freyther wrote: >> On 7. Jun 2017, at 14:09, Stephan Eggermont <stephan(a)stack.nl> wrote: >> >> Never refer to fixed versions unless you know why (you need to avoid a >> specific bug fix). > When wanting to have repeatable builds (e.g. for bugfixes) and in the > absence of other means to lock/define versions externally, I think using > a fixed version is the way to go. > > >> What is most likely is that there is some overconstrained configuration. >> Does your ConfigurationOfVoyageMongo or one of the configurations it >> pulls in refer to different versions of grease or magritte? Another >> issue can be that there are older configurations already loaded that >> conflict with the newest ones. Indeed, the ConfigurationOfMongoTalk >> is broken, refering to a fixed and older version of Grease. >> ConfigurationOfVoyageMongo should probably be using #'release3' of >> Magritte, but that doesn't break it. > Right. So we have a "OsmocomUniverse" build job that pulls in all the > apps into a single image. This helps to make API modifications and not > forget any of the client code. > > The configuration has such dependencies: > > ConfigurationOfOsmocomUniverse > -> ConfigurationOfHLR > -> ConfigurationOfVoyageMongo > -> Mongotalk > -> Grease A > -> Magritte3 > -> Grease B > -> ConfigurationOfSMPPRouter > -> ConfigurationOfVoyageMongo > -> Mongotalk > -> Grease A > -> Magritte3 > -> Grease B > > What happens is that somehow "Grease A" gets loaded, then "Grease B" and > when it is time for "Grease A" again.. the system kind of explodes and this > is for Pharo3 and Pharo6. Now the question to me is.. why is this coming > up right now? Did MongoTalk change or Magritte3 or something else? > > Is there an easy way for Metacello to try a mirror instead of the original, > e.g. to inject an older ConfigurationOfMagritte3? > I think that the `lock` command[1] is what you are looking for ... Dale [1] https://github.com/dalehenrich/metacello-work/blob/master/docs/MetacelloUse…

June 7, 2017

Re: [Pharo-users] RewriteToolbuilder question

by werner kassens

Hi Mark, the code from Number>>raisedTo: aNumber isInteger ifTrue: [ "Do the special case of integer power" ^ self raisedToInteger: aNumber]. aNumber isFraction ifTrue: [ "Special case for fraction power" ^ (self nthRoot: aNumber denominator) raisedToInteger: aNumber numerator ]. self < 0 ifTrue: [ ^ ArithmeticError signal: 'Negative numbers can''t be raised to float powers.' ]. 0 = aNumber ifTrue: [^ self class one]. "Special case of exponent=0" 1 = aNumber ifTrue: [^ self]. "Special case of exponent=1" 0 = self ifTrue: [ "Special case of self = 0" aNumber < 0 ifTrue: [^ (ZeroDivide dividend: self) signal] ifFalse: [^ self]]. ^ (aNumber * self ln) exp "Otherwise use logarithms" Werner p.s. Hi Ben, <g> yes, i wrote that email a bit too fast, the video from http://www.screencast.com/t/LCEl0hFl On 06/07/2017 07:03 PM, Mark Rizun wrote: > Hi Werner, > > I believe that I am the one to answer this question, but I need more > information. > Please, could you send the code that you have in upper left panel. > > Cheers, > Mark > > 2017-06-07 18:46 GMT+02:00 Ben Coman <btc(a)openinworld.com > <mailto:btc@openinworld.com>>: > > I don't know much about RewriteToolbuilder, so probably won't be > the one to give a proper answer, > but to help someone else answer... could you narrow down which > video with a link? > > cheers -ben > > On Thu, Jun 8, 2017 at 12:05 AM, werner kassens > <wkassens(a)libello.com <mailto:wkassens@libello.com>> wrote: > > Hi, > i followed the video and opened the RewriteToolbuilder on some > code in pharo4.0. i then tried to keep things simple and made > a transformationrule,which i thought would not change > anything, by just copying "â@.Statements." into the lower left > & right panels (without the " of course).i then press > 'generate rule' and get a 'Syntax Error: end of Statement list > encountered' with this specification: ^ ArithmeticError > signal: 'Negative numbers canEnd of statement list encountered > -> ''t be raised to float powers.' . but this part of the code > in the upper left panel is just a copy of some unchanged > standard pharo4.0 code. where did i go wrong? > werner > > > >

June 7, 2017