November 2018 - Pharo-users

Uncle Bob's package design metrics
by Rafael Luque Nov. 29, 2018

Nov. 29, 2018

Hi, Recently I've reread the chapter about "Package Design Principles" from the Robert C. Martin's "Agile Software Development" book and immediately find myself playing within the reflective and moldable Pharo's environment. I've built an small library DMMetrics that you can find at GitHub: https://github.com/osoco/dm-metrics This is a still very rough and work-in-progress, but I hope to be able to use it in my own projects to get some insights about my package design. Besides my unknowns about Roassal or Renraku, I've also found more conceptual difficulties trying to adapt some metrics as were originally defined by Robert Martin to Pharo's idiosyncrasies. For instance, for measuring the abstraction level of a package, the "Abstractness" metric is defined as Na/Nc; where Na is the number of classes in the package and Nc represents the number of abstract classes in the package. In a language like Java Nc refers to the number of interfaces and classes with at least one abstract method. In Pharo I'm counting the number of classes with methods sending "self subclassResponsibility", but I suspect that this way of measuring is resulting in abstractness values lower than it should be. Maybe I should take into account other Smalltalkish idioms that also contribute to the class abstraction level. Any idea in this way would be of great help. Thank you!

1 0

how to write this without a if then
by Roelof Wobben Nov. 28, 2018

Nov. 28, 2018

Hello, Yesterday I had a talk with luc frabresse about using if then. He said if I understand it right, Its the best to not using a if then or a ifTrue/ifFalse. Can anyone help me figure out how to rewrite this project so I will not use the ifTrue in the basement function. my code so far can be found here : https://github.com/RoelofWobben/AOC2015 Roelof

5 7

Pharo 7 - RFB
by Sanjay Minni Nov. 27, 2018

Nov. 27, 2018

Where can I find RFB for Pharo 7 ----- --- Regards, Sanjay -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html

3 5

Problems with NeoCSV Package
by William L. Cleveland Nov. 27, 2018

Nov. 27, 2018

I need to manually tag a large number of sentences choosing between a small, fixed number of short strings as tags for each sentence. I would like to do this with a Pharo GUI that displays sentences one at a time and permit choice of tags using radio buttons. The results need to be saved as a CSV file on the hard drive for further manipulations with python. As a first step, I used Excel to create a test CSV file with two sentences that was saved on the disk drive in the Pharo working directory. I have subsequently tried to import the sentences into Pharo 6.1 32 bit stable. This was done as follows. |workingDir reader result| workingDir := FileSystem disk workingDirectory. myFileName := 'MoonCSV.csv'. stream := workingDir/myFileName readStreamDo: [ :stream | stream contents]. reader := (NeoCSVReader new) separator: Character cr. The separator was changed from a comma to a cr because the inspector showed a cr, not a comma separating the two imported sentences. result := (reader on: stream). result upToEnd. This failed with the following error: Instance of ByteString doesnât understand #atEnd. I donât see how to proceed further. Also I am not clear on the best way to export the sentence and tags to the disk drive.. Any help would be appreciated. Lou Cleveland

2 1

Re: [Pharo-users] Do you have Pharo + SQLite experience?
by Offray Vladimir Luna CÃ¡rdenas Nov. 27, 2018

Nov. 27, 2018

Hi Juraj I used UDBC, that is documented in the blog referred by Sven. You can find a Pharo project that uses it at [1] [1] https://mutabit.com/offray/blog/en/entry/panama-papers-1 Cheers, Offray On 27/11/18 8:09, Juraj Kubelka via Pharo-users wrote:

1 0

Re: [Pharo-users] Do you have Pharo + SQLite experience?
by Sven Van Caekenberghe Nov. 27, 2018

Nov. 27, 2018

http://www.samadhiweb.com/tags/SQLite > On 27 Nov 2018, at 13:16, Juraj Kubelka via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Juraj Kubelka <juraj.kubelka(a)icloud.com> > Subject: Do you have Pharo + SQLite experience? > Date: 27 November 2018 at 13:16:00 GMT+1 > To: Any question about pharo is welcome <pharo-users(a)lists.pharo.org> > > > Hi all, > > I would like to play with SQLite using Pharo. Does anyone use SQLite in Pharo (version 7)? > What library is recommended to use? And what is your experience (pros and cons) of the existing solutions? > Do you have a project using SQLite in Pharo that I can download and look at it? > > Thank you, > Juraj > > > >

2 1

Do you have Pharo + SQLite experience?
by Juraj Kubelka Nov. 27, 2018

Nov. 27, 2018

Hi all, I would like to play with SQLite using Pharo. Does anyone use SQLite in Pharo (version 7)? What library is recommended to use? And what is your experience (pros and cons) of the existing solutions? Do you have a project using SQLite in Pharo that I can download and look at it? Thank you, Juraj

1 0

Tracking method in and out with MetaLinks
by Manuel Leuenberger Nov. 27, 2018

Nov. 27, 2018

Hi, I stumbled upon another MetaLink scenario that I am unsure how to implement. I want to track method invocations, with receiver, arguments, selector, and return value (maybe even signaled exception). I can track the method input with a MetaLink installed on an RBMethodNode like this: MetaLink new metaObject: [ :c | Transcript show: c receiver; show: c method selector; show: c arguments; cr ]; selector: #value:; arguments: #(context). and for returns with a MetaLink on RBReturnNodes like this: MetaLink new metaObject: [ :v | Transcript show: v; cr ]; selector: #value:; arguments: #(value) The problem is though, that not all methods have explicit returns, and some mix explicit returns and self returns. I tried installed an #after MetaLink on a RBMethodNode, but this fails in many cases. Is there any way that I can instrument a method and track receiver, selector, arguments, and returned value (even if self) at the same time? Cheers, Manuel

2 5

Re: [Pharo-users] question about FFI
by Esteban Lorenzano Nov. 26, 2018

Nov. 26, 2018

> On 26 Nov 2018, at 11:14, Henrik Sperre Johansen via Pharo-users <pharo-users(a)lists.pharo.org> wrote: > > > From: Henrik Sperre Johansen <henrik.s.johansen(a)veloxit.no> > Subject: Re: question about FFI > Date: 26 November 2018 at 11:14:26 CET > To: pharo-users(a)lists.pharo.org > > > Yuriy Babah wrote >> in Playground i'm doing: > * >> #(2 3) doWithIndex: [:each :i | xm at: i put: each]. >> #(3 4) doWithIndex: [:each :i | ym at: i put: each]. > * >> >> whot i'm doing wrong? > > So, you're putting 2 at index 2 of xm, and then writing 3 past end of array, > and in ym you're putting 3 and 4 at offsets past the end of array? > > It's a wonder your image didn't crash, rather than return interpolation of > the uninitialized valuesâ¦ He is not doing that. He is using #doWithIndex: So he is passing 2 at index 1 and 3 at index 2, then 3 at index 1 and 4 at index 2. Esteban > > Cheers, > Henry > > > > -- > Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html > > >

1 0

question about FFI
by Yuriy Babah Nov. 26, 2018

Nov. 26, 2018

Hi ! I'm trying to call a very simple function from C ++ lib, writed for the test. function with prototype: extern "C" float interpolationFunc(float* xm, float* ym, int size, float x). In Pharo7 wrote: FFIExamples class >> interpolationFunc_xm: xM ym: yM size: size x: x ^ self ffiCall: #(float interpolationFunc #(float * xM , float * yM , int size , float x)) module: 'libinterpolationLib.so' in Playground i'm doing: xm := FFIExternalArray externalNewType: 'float' size: 2. ym := xm clone. #(2 3) doWithIndex: [:each :i | xm at: i put: each]. #(3 4) doWithIndex: [:each :i | ym at: i put: each]. FFIExamples interpolationFunc_xm: xm pointer ym: ym pointer size: 2 x: 2.5 . last expression returninÐ¿ me 0.0, but right is 3.5. I'm dit the same in Python3 ctypes, and there work's fine. In UnifiedFFI booklet is absent chapter "Arrays", anybody may help with whot i'm doing wrong?

4 7