January 2011 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Left recursion in PetitParser

by Lukas Renggli

PPParser>>#cycleSet is contained in the package PetitAnalyzer. You can get it from the PetitParser repository at http://source.lukas-renggli.ch/petit. The package contains all kinds of reflective facilities to query and transform grammars. Lukas On 31 January 2011 16:35, Andrew Black <t-ablack(a)microsoft.com> wrote: > > > -----Original Message----- >> From: pharo-users-bounces(a)lists.gforge.inria.fr [mailto:pharo-users-bounces@lists.gforge.inria.fr] On Behalf Of Lukas Renggli >> Sent: 21 January 2011 14:39 >> To: A friendly place where any question about pharo is welcome >> Subject: Re: [Pharo-users] Left recursion in PetitParser > >> > I know how to left-factor the grammar by hand.Â But should I have to? >> > How powerful is thy magic, Lukas? > >> There is Â no magic. > >> You can fix the problem by wrapping one of the parsers in the cycle with #memoize. That could be done automatically (#cycleSet finds the cycles), but I would rather refactor the grammar as it leads to extremely inefficient parsers. > >> If you want to build complicated expression grammars (where typically left-recursion occurs) it might be useful to use the PPExpressionParser, see the class comment for an example. > > I got my parser working by refactoring the grammar; Â Using not to do a little look-ahead and direct things down the correct path helped. > > I saw the tests for memoize, and get the idea of how to use it. Â But I don't find a cycleSet method anywhere ... > > Â Â Andrew > > > -- Lukas Renggli www.lukas-renggli.ch

Jan. 31, 2011

Re: [Pharo-users] Left recursion in PetitParser

by Andrew Black

-----Original Message----- > From: pharo-users-bounces(a)lists.gforge.inria.fr [mailto:pharo-users-bounces@lists.gforge.inria.fr] On Behalf Of Lukas Renggli > Sent: 21 January 2011 14:39 > To: A friendly place where any question about pharo is welcome > Subject: Re: [Pharo-users] Left recursion in PetitParser > > I know how to left-factor the grammar by hand.Â But should I have to?Â > > How powerful is thy magic, Lukas? > There is no magic. > You can fix the problem by wrapping one of the parsers in the cycle with #memoize. That could be done automatically (#cycleSet finds the cycles), but I would rather refactor the grammar as it leads to extremely inefficient parsers. > If you want to build complicated expression grammars (where typically left-recursion occurs) it might be useful to use the PPExpressionParser, see the class comment for an example. I got my parser working by refactoring the grammar; Using not to do a little look-ahead and direct things down the correct path helped. I saw the tests for memoize, and get the idea of how to use it. But I don't find a cycleSet method anywhere ... Andrew

Jan. 31, 2011

Re: [Pharo-users] Scrolling in a Morphic game

by Igor Stasenko

On 29 January 2011 20:39, Aidan Gauland <aidalgol(a)no8wireless.co.nz> wrote: > On Wed, Jan 26, 2011 at 10:51:29AM +0100, Tudor Girba wrote: >> Perhaps you want to take a look at the ScrollPane or GeneralScrollPane implementation. > > I found TransformMorph when looking at ScrollPane. Â I think I'll use > that. >\ Yep. For 'moving' parts of scene add the transform morph and put all other morphs to it, then you can control their relative placement using single object. > I'll post to this list when my game engine is usable, since there is > some interest in the scrolling part. > > Regards, > Aidan > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (GNU/Linux) > > iEYEARECAAYFAk1EbOIACgkQjyzTRvYJmaVCoACdEVfyuP27WuuuhQ5S4IBoHdvd > 0QMAn1pLqqst8KrxM75WFAXBbnQ+ZsUn > =A6eJ > -----END PGP SIGNATURE----- > > -- Best regards, Igor Stasenko AKA sig.

Jan. 29, 2011

Re: [Pharo-users] Scrolling in a Morphic game

by Aidan Gauland

On Wed, Jan 26, 2011 at 10:51:29AM +0100, Tudor Girba wrote: > Perhaps you want to take a look at the ScrollPane or GeneralScrollPane implementation. I found TransformMorph when looking at ScrollPane. I think I'll use that. I'll post to this list when my game engine is usable, since there is some interest in the scrolling part. Regards, Aidan

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Igor Stasenko

On 29 January 2011 14:23, Helene Bilbo <thereluctantprogrammer(a)fastmail.fm> wrote: > > > StÃ©phane Ducasse wrote: >> >> Hi helene >> >> Where are you located? >> Because we could do some pair programming. >> > Berlin, Germany > > > StÃ©phane Ducasse wrote: >> >> I did that with olivier yesterday and I understand your point. >> What I could do is to record when I'm programming my card collection >> application and like that the >> world would see me failing and retrying :) >> Stef >> > > Yes of course, i would like to watch a live-programming screencast. > But to me, the difficulty is READING existing code much more than writing > new code. I do the âwrite in the debuggerâ thing, that was mentioned on > pharocast and in some tutorials and it works really nice. > Yeah. Understanding code is difficult. Even your own code could make no sense to you after half of the year :) What i can say.. there is no universal cure.. different people learn things differently. Definitely, you should master the browser and usual shortcuts, so it will help you finding things quicker and follow the code logic in order to understand it. > Helene. > > -- > View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > -- Best regards, Igor Stasenko AKA sig.

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by laurent laffont

On Sat, Jan 29, 2011 at 11:42 AM, StÃ©phane Ducasse < stephane.ducasse(a)inria.fr> wrote: > Hi helene > > Where are you located? > Because we could do some pair programming. > I did that with olivier yesterday and I understand your point. > What I could do is to record when I'm programming my card collection > application and like that the > world would see me failing and retrying :) > May be someone can record like http://jamesshore.com/Blog/Lets-Play/Episode-37.html . Laurent > > Stef > > On Jan 28, 2011, at 5:04 PM, Helene Bilbo wrote: > > > > > Hi, > > i have a proposition for a Pharo-Screencast: > > > > I would love to look over someoneâs shoulder while she/he is *reading* > code. > > A possible plot would be to download something from squeaksource and then > > trying to make sense out of it - and talking while doing so. (It would > also > > be good to see all the relevant functions of the browser in action). > > > > Background: While i have read some books now (blue book, pharo by > example, > > seaside by example, best practice patterns) i have never actually seen > > people programming. So i absolutely miss the craftsmanship side of > things. > > > > Anyway thank you for Pharocasts. > > Best regards, > > Helene. > > -- > > View this message in context: > http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > > > >

Jan. 29, 2011

Making a .st file from the source of a method

by Sean P. DeNigris

I have a class that I use to set up my images. A subclass has a method: setupScript (Smalltalk at: #UpdateStreamer) new updateFromServer. "Do other stuff..." I want to save the statements of the method above in a .st file to pass as an argument to the vm. That's all working, but in order to retrieve the two statements above, I do: setupScriptContents | scriptMethod sourceString sourceStringWithBracketsStripped | scriptMethod := PharoTrunkImage compiledMethodAt: #setupScript. sourceString := scriptMethod methodNode body asString. sourceStringWithBracketsStripped := sourceString copyFrom: 3 to: sourceString size - 2. ^ sourceStringWithBracketsStripped. That works, but I don't like it. What's the best way to do this (or is this it)? Thanks. Sean -- View this message in context: http://forum.world.st/Making-a-st-file-from-the-source-of-a-method-tp324624… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Helene Bilbo

"StÃ©phane Ducasseâ wrote: > > > Now I'm also thinking that we should have a converging approach by also > fixing Morphic so I will start reading both code. > > Stef > Hi StÃ©phane, i quoted this from the Pharo Smalltalk list -> this is the thing you should comment while doing it and record as a screencast. It would be wonderful :) Best regards, Helene. -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Helene Bilbo

StÃ©phane Ducasse wrote: > > Hi helene > > Where are you located? > Because we could do some pair programming. > Berlin, Germany StÃ©phane Ducasse wrote: > > I did that with olivier yesterday and I understand your point. > What I could do is to record when I'm programming my card collection > application and like that the > world would see me failing and retrying :) > Stef > Yes of course, i would like to watch a live-programming screencast. But to me, the difficulty is READING existing code much more than writing new code. I do the âwrite in the debuggerâ thing, that was mentioned on pharocast and in some tutorials and it works really nice. Helene. -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Helene Bilbo

âsimondenierâ wrote: > > Read the comments if there are some, especially with snippets of code for > do-it. > Read the tests, try to find how one instantiate a particular object, then > put a self halt in a test or create a new object in a workspace and open > an inspector on it; interact with the object to send it messages and see > how it reacts (with the class browser by the side of course). > > Learn the strengths and weaknesses of the various browsers, and especially > the shortcuts to quickly launch them (select some text in the source > then): > alt+b -> browse class > alt+m -> browse implementors (method definitions) > alt+n -> senders (messages calls) > alt+shit+r -> references to class > etc. > > So basically yes. Understanding a Smalltalk program is somehow a heuristic > process (like all program understanding): browse code, browse implementors > or senders until you can not get further or lost track, make hypothesis > about how it works and check by browsing again and querying live > instances. > > In Smalltalk the language and its syntax are simple, so you get more work > to learn the whole API and the tools, especially since they are a bit > unconventional. So I can understand that you feel lost. But the best way > would be to learn by doing, with somebody while pair-programming. > Thank you for the hints and encouragement. My problems are probably not Smalltalk/Pharo specific - i might reveal that i have no formal training in programming or computer science. I did little things in Objective-C/XCode and Java/Eclipse and i really love the Smalltalk/Pharo,Cuis,Squeak experience compared to that. As i was not trained in other things, Pharo does not at all feel âunconventionalâ to me. Helene. -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by StÃ©phane Ducasse

Hi helene Where are you located? Because we could do some pair programming. I did that with olivier yesterday and I understand your point. What I could do is to record when I'm programming my card collection application and like that the world would see me failing and retrying :) Stef On Jan 28, 2011, at 5:04 PM, Helene Bilbo wrote: > > Hi, > i have a proposition for a Pharo-Screencast: > > I would love to look over someoneâs shoulder while she/he is *reading* code. > A possible plot would be to download something from squeaksource and then > trying to make sense out of it - and talking while doing so. (It would also > be good to see all the relevant functions of the browser in action). > > Background: While i have read some books now (blue book, pharo by example, > seaside by example, best practice patterns) i have never actually seen > people programming. So i absolutely miss the craftsmanship side of things. > > Anyway thank you for Pharocasts. > Best regards, > Helene. > -- > View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by flebber

These screenscasts are for squeak, but they are good. Practical examples of how to get things up and running http://www.youtube.com/user/gandysmedicineshow http://www.youtube.com/user/gandysmedicineshow -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 29, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Tudor Girba

I am working on a couple of screencasts :). My plan is to get them working within a couple of weeks. Cheers, Doru On 28 Jan 2011, at 23:11, laurent laffont wrote: > On Fri, Jan 28, 2011 at 11:06 PM, Simon Denier <simon.denier(a)gmail.com> wrote: > > On 28 janv. 2011, at 22:52, laurent laffont wrote: > >> > >> > What kind of âstrategyâ or âpatternâ do you use to understand a >> > class/package? >> >> Since I am a Moose expert, I don't really know how people do it without visualizations :) >> >> >> Would be cool to have a Moose for newbies screencast ..... > > > We used to demo Moose a lot in live, with most basic features (importing a model, browsing and querying the model with the finder, building your own visualization with Mondrian...). My recent experience told me that screencasting is not my cup of tea :) > > Don't hesitate to record a "draft" screencast and send it to me. Video editing tools can do magic. > > Laurent. > > > > I don't know if Doru will have the time. > > >> >> Laurent >> >> >> >> > Where do i start reading in the first place? >> >> >> Read the comments if there are some, especially with snippets of code for do-it. >> Read the tests, try to find how one instantiate a particular object, then put a self halt in a test or create a new object in a workspace and open an inspector on it; interact with the object to send it messages and see how it reacts (with the class browser by the side of course). >> >> Learn the strengths and weaknesses of the various browsers, and especially the shortcuts to quickly launch them (select some text in the source then): >> alt+b -> browse class >> alt+m -> browse implementors (method definitions) >> alt+n -> senders (messages calls) >> alt+shit+r -> references to class >> etc. >> >> > >> >> > Do i search messages / try to âfollowâ them using method finder? >> >> So basically yes. Understanding a Smalltalk program is somehow a heuristic process (like all program understanding): browse code, browse implementors or senders until you can not get further or lost track, make hypothesis about how it works and check by browsing again and querying live instances. >> >> >> > I tried to file out classes and print them on paper - which was a bad idea.. >> > Do you take notes? Make drawings? Just read along in the SystemBrowser? >> > >> > Can you imagine a bit, what i mean? It is really very basic.. >> > Best regards, Helene. >> >> >> In Smalltalk the language and its syntax are simple, so you get more work to learn the whole API and the tools, especially since they are a bit unconventional. So I can understand that you feel lost. But the best way would be to learn by doing, with somebody while pair-programming. >> >> >> > >> > >> > laurent laffont wrote: >> >> >> >> Hi, >> >> >> >> indeed I don't really see how to do this sort of screencast ..... >> >> >> >> Which packages would you like to see explained ? >> >> >> >> Laurent >> >> >> >> On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < >> >> thereluctantprogrammer(a)fastmail.fm> wrote: >> >> >> >>> >> >>> Hi, >> >>> i have a proposition for a Pharo-Screencast: >> >>> >> >>> I would love to look over someoneâs shoulder while she/he is *reading* >> >>> code. >> >>> A possible plot would be to download something from squeaksource and then >> >>> trying to make sense out of it - and talking while doing so. (It would >> >>> also >> >>> be good to see all the relevant functions of the browser in action). >> >>> >> >>> Background: While i have read some books now (blue book, pharo by >> >>> example, >> >>> seaside by example, best practice patterns) i have never actually seen >> >>> people programming. So i absolutely miss the craftsmanship side of >> >>> things. >> >>> >> >>> Anyway thank you for Pharocasts. >> >>> Best regards, >> >>> Helene. >> >>> -- >> >>> View this message in context: >> >>> http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… >> >>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >>> >> >>> >> >> >> >> >> > -- >> > View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… >> > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> > >> >> -- >> Simon Denier >> >> >> >> >> > > -- > Simon Denier > > > > -- www.tudorgirba.com "Obvious things are difficult to teach."

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by laurent laffont

On Fri, Jan 28, 2011 at 11:06 PM, Simon Denier <simon.denier(a)gmail.com>wrote: > > On 28 janv. 2011, at 22:52, laurent laffont wrote: > > > >> > What kind of âstrategyâ or âpatternâ do you use to understand a >> > class/package? >> >> Since I am a Moose expert, I don't really know how people do it without >> visualizations :) >> > > > Would be cool to have a Moose for newbies screencast ..... > > > > We used to demo Moose a lot in live, with most basic features (importing a > model, browsing and querying the model with the finder, building your own > visualization with Mondrian...). My recent experience told me that > screencasting is not my cup of tea :) > Don't hesitate to record a "draft" screencast and send it to me. Video editing tools can do magic. Laurent. > I don't know if Doru will have the time. > > > > Laurent > > > >> >> > Where do i start reading in the first place? >> >> >> Read the comments if there are some, especially with snippets of code for >> do-it. >> Read the tests, try to find how one instantiate a particular object, then >> put a self halt in a test or create a new object in a workspace and open an >> inspector on it; interact with the object to send it messages and see how it >> reacts (with the class browser by the side of course). >> >> Learn the strengths and weaknesses of the various browsers, and especially >> the shortcuts to quickly launch them (select some text in the source then): >> alt+b -> browse class >> alt+m -> browse implementors (method definitions) >> alt+n -> senders (messages calls) >> alt+shit+r -> references to class >> etc. >> >> > >> >> > Do i search messages / try to âfollowâ them using method finder? >> >> So basically yes. Understanding a Smalltalk program is somehow a heuristic >> process (like all program understanding): browse code, browse implementors >> or senders until you can not get further or lost track, make hypothesis >> about how it works and check by browsing again and querying live instances. >> >> >> > I tried to file out classes and print them on paper - which was a bad >> idea.. >> > Do you take notes? Make drawings? Just read along in the SystemBrowser? >> > >> > Can you imagine a bit, what i mean? It is really very basic.. >> > Best regards, Helene. >> >> >> In Smalltalk the language and its syntax are simple, so you get more work >> to learn the whole API and the tools, especially since they are a bit >> unconventional. So I can understand that you feel lost. But the best way >> would be to learn by doing, with somebody while pair-programming. >> >> >> > >> > >> > laurent laffont wrote: >> >> >> >> Hi, >> >> >> >> indeed I don't really see how to do this sort of screencast ..... >> >> >> >> Which packages would you like to see explained ? >> >> >> >> Laurent >> >> >> >> On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < >> >> thereluctantprogrammer(a)fastmail.fm> wrote: >> >> >> >>> >> >>> Hi, >> >>> i have a proposition for a Pharo-Screencast: >> >>> >> >>> I would love to look over someoneâs shoulder while she/he is *reading* >> >>> code. >> >>> A possible plot would be to download something from squeaksource and >> then >> >>> trying to make sense out of it - and talking while doing so. (It would >> >>> also >> >>> be good to see all the relevant functions of the browser in action). >> >>> >> >>> Background: While i have read some books now (blue book, pharo by >> >>> example, >> >>> seaside by example, best practice patterns) i have never actually seen >> >>> people programming. So i absolutely miss the craftsmanship side of >> >>> things. >> >>> >> >>> Anyway thank you for Pharocasts. >> >>> Best regards, >> >>> Helene. >> >>> -- >> >>> View this message in context: >> >>> >> http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… >> >>> Sent from the Pharo Smalltalk Users mailing list archive at >> Nabble.com. >> >>> >> >>> >> >> >> >> >> > -- >> > View this message in context: >> http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… >> > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> > >> >> -- >> Simon Denier >> >> >> >> >> > > -- > Simon Denier > > > >

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Simon Denier

On 28 janv. 2011, at 22:52, laurent laffont wrote: > > > > What kind of âstrategyâ or âpatternâ do you use to understand a > > class/package? > > Since I am a Moose expert, I don't really know how people do it without visualizations :) > > > Would be cool to have a Moose for newbies screencast ..... We used to demo Moose a lot in live, with most basic features (importing a model, browsing and querying the model with the finder, building your own visualization with Mondrian...). My recent experience told me that screencasting is not my cup of tea :) I don't know if Doru will have the time. > > Laurent > > > > > Where do i start reading in the first place? > > > Read the comments if there are some, especially with snippets of code for do-it. > Read the tests, try to find how one instantiate a particular object, then put a self halt in a test or create a new object in a workspace and open an inspector on it; interact with the object to send it messages and see how it reacts (with the class browser by the side of course). > > Learn the strengths and weaknesses of the various browsers, and especially the shortcuts to quickly launch them (select some text in the source then): > alt+b -> browse class > alt+m -> browse implementors (method definitions) > alt+n -> senders (messages calls) > alt+shit+r -> references to class > etc. > > > > > > Do i search messages / try to âfollowâ them using method finder? > > So basically yes. Understanding a Smalltalk program is somehow a heuristic process (like all program understanding): browse code, browse implementors or senders until you can not get further or lost track, make hypothesis about how it works and check by browsing again and querying live instances. > > > > I tried to file out classes and print them on paper - which was a bad idea.. > > Do you take notes? Make drawings? Just read along in the SystemBrowser? > > > > Can you imagine a bit, what i mean? It is really very basic.. > > Best regards, Helene. > > > In Smalltalk the language and its syntax are simple, so you get more work to learn the whole API and the tools, especially since they are a bit unconventional. So I can understand that you feel lost. But the best way would be to learn by doing, with somebody while pair-programming. > > > > > > > > laurent laffont wrote: > >> > >> Hi, > >> > >> indeed I don't really see how to do this sort of screencast ..... > >> > >> Which packages would you like to see explained ? > >> > >> Laurent > >> > >> On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < > >> thereluctantprogrammer(a)fastmail.fm> wrote: > >> > >>> > >>> Hi, > >>> i have a proposition for a Pharo-Screencast: > >>> > >>> I would love to look over someoneâs shoulder while she/he is *reading* > >>> code. > >>> A possible plot would be to download something from squeaksource and then > >>> trying to make sense out of it - and talking while doing so. (It would > >>> also > >>> be good to see all the relevant functions of the browser in action). > >>> > >>> Background: While i have read some books now (blue book, pharo by > >>> example, > >>> seaside by example, best practice patterns) i have never actually seen > >>> people programming. So i absolutely miss the craftsmanship side of > >>> things. > >>> > >>> Anyway thank you for Pharocasts. > >>> Best regards, > >>> Helene. > >>> -- > >>> View this message in context: > >>> http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > >>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >>> > >>> > >> > >> > > -- > > View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > > > -- > Simon Denier > > > > > -- Simon Denier

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Helene Bilbo

"laurent laffontâ wrote: > > I've created this application a year ago to get some overview > http://magaloma.seasidehosting.st/ I still use it sometimes. > Ah, ok. While this is not what i meant by reading the coding â that is a very nice application. I will spend some time there :) Helene. -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by laurent laffont

> > > > > What kind of âstrategyâ or âpatternâ do you use to understand a > > class/package? > > Since I am a Moose expert, I don't really know how people do it without > visualizations :) > Would be cool to have a Moose for newbies screencast ..... Laurent > > > Where do i start reading in the first place? > > > Read the comments if there are some, especially with snippets of code for > do-it. > Read the tests, try to find how one instantiate a particular object, then > put a self halt in a test or create a new object in a workspace and open an > inspector on it; interact with the object to send it messages and see how it > reacts (with the class browser by the side of course). > > Learn the strengths and weaknesses of the various browsers, and especially > the shortcuts to quickly launch them (select some text in the source then): > alt+b -> browse class > alt+m -> browse implementors (method definitions) > alt+n -> senders (messages calls) > alt+shit+r -> references to class > etc. > > > > > > Do i search messages / try to âfollowâ them using method finder? > > So basically yes. Understanding a Smalltalk program is somehow a heuristic > process (like all program understanding): browse code, browse implementors > or senders until you can not get further or lost track, make hypothesis > about how it works and check by browsing again and querying live instances. > > > > I tried to file out classes and print them on paper - which was a bad > idea.. > > Do you take notes? Make drawings? Just read along in the SystemBrowser? > > > > Can you imagine a bit, what i mean? It is really very basic.. > > Best regards, Helene. > > > In Smalltalk the language and its syntax are simple, so you get more work > to learn the whole API and the tools, especially since they are a bit > unconventional. So I can understand that you feel lost. But the best way > would be to learn by doing, with somebody while pair-programming. > > > > > > > > laurent laffont wrote: > >> > >> Hi, > >> > >> indeed I don't really see how to do this sort of screencast ..... > >> > >> Which packages would you like to see explained ? > >> > >> Laurent > >> > >> On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < > >> thereluctantprogrammer(a)fastmail.fm> wrote: > >> > >>> > >>> Hi, > >>> i have a proposition for a Pharo-Screencast: > >>> > >>> I would love to look over someoneâs shoulder while she/he is *reading* > >>> code. > >>> A possible plot would be to download something from squeaksource and > then > >>> trying to make sense out of it - and talking while doing so. (It would > >>> also > >>> be good to see all the relevant functions of the browser in action). > >>> > >>> Background: While i have read some books now (blue book, pharo by > >>> example, > >>> seaside by example, best practice patterns) i have never actually seen > >>> people programming. So i absolutely miss the craftsmanship side of > >>> things. > >>> > >>> Anyway thank you for Pharocasts. > >>> Best regards, > >>> Helene. > >>> -- > >>> View this message in context: > >>> > http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > >>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >>> > >>> > >> > >> > > -- > > View this message in context: > http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > > > > -- > Simon Denier > > > > >

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Simon Denier

Can't you meet someone in a barcamp in your city, who would show you the basics? Also did you practice http://pharobyexample.org to learn the tools? On 28 janv. 2011, at 22:08, Helene Bilbo wrote: > > Hi, > i donât want to see a specific package explained - i would rather like to > watch, how someone will make sense of a package she/he doesnât know (and > that does not have much comments..) and tries to read and understand it. > > I just sit here and try to understand SpectrumAnalyzerMorph - but perhaps > this is a bad example, because it is included in Pharo 1.1.1 but doesnât > work there. This would be more a debugging show.. > > What kind of âstrategyâ or âpatternâ do you use to understand a > class/package? Since I am a Moose expert, I don't really know how people do it without visualizations :) > Where do i start reading in the first place? Read the comments if there are some, especially with snippets of code for do-it. Read the tests, try to find how one instantiate a particular object, then put a self halt in a test or create a new object in a workspace and open an inspector on it; interact with the object to send it messages and see how it reacts (with the class browser by the side of course). Learn the strengths and weaknesses of the various browsers, and especially the shortcuts to quickly launch them (select some text in the source then): alt+b -> browse class alt+m -> browse implementors (method definitions) alt+n -> senders (messages calls) alt+shit+r -> references to class etc. > > Do i search messages / try to âfollowâ them using method finder? So basically yes. Understanding a Smalltalk program is somehow a heuristic process (like all program understanding): browse code, browse implementors or senders until you can not get further or lost track, make hypothesis about how it works and check by browsing again and querying live instances. > I tried to file out classes and print them on paper - which was a bad idea.. > Do you take notes? Make drawings? Just read along in the SystemBrowser? > > Can you imagine a bit, what i mean? It is really very basic.. > Best regards, Helene. In Smalltalk the language and its syntax are simple, so you get more work to learn the whole API and the tools, especially since they are a bit unconventional. So I can understand that you feel lost. But the best way would be to learn by doing, with somebody while pair-programming. > > > laurent laffont wrote: >> >> Hi, >> >> indeed I don't really see how to do this sort of screencast ..... >> >> Which packages would you like to see explained ? >> >> Laurent >> >> On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < >> thereluctantprogrammer(a)fastmail.fm> wrote: >> >>> >>> Hi, >>> i have a proposition for a Pharo-Screencast: >>> >>> I would love to look over someoneâs shoulder while she/he is *reading* >>> code. >>> A possible plot would be to download something from squeaksource and then >>> trying to make sense out of it - and talking while doing so. (It would >>> also >>> be good to see all the relevant functions of the browser in action). >>> >>> Background: While i have read some books now (blue book, pharo by >>> example, >>> seaside by example, best practice patterns) i have never actually seen >>> people programming. So i absolutely miss the craftsmanship side of >>> things. >>> >>> Anyway thank you for Pharocasts. >>> Best regards, >>> Helene. >>> -- >>> View this message in context: >>> http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… >>> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >>> >>> >> >> > -- > View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > -- Simon Denier

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by laurent laffont

I understand the difficulties. Indeed I've created Pharocasts to learn ;) You learn better when you do something, for me a way is to record screencasts. I've created this application a year ago to get some overview http://magaloma.seasidehosting.st/ I still use it sometimes. Feel free to ask on the mailing-list, there are helpful people (cool !). And one great way to contribute is to write comments on what you have understood and submit your package to PharoInbox Laurent. On Fri, Jan 28, 2011 at 10:08 PM, Helene Bilbo < thereluctantprogrammer(a)fastmail.fm> wrote: > > Hi, > i donât want to see a specific package explained - i would rather like to > watch, how someone will make sense of a package she/he doesnât know (and > that does not have much comments..) and tries to read and understand it. > > I just sit here and try to understand SpectrumAnalyzerMorph - but perhaps > this is a bad example, because it is included in Pharo 1.1.1 but doesnât > work there. This would be more a debugging show.. > > What kind of âstrategyâ or âpatternâ do you use to understand a > class/package? > Where do i start reading in the first place? > Do i search messages / try to âfollowâ them using method finder? > I tried to file out classes and print them on paper - which was a bad > idea.. > Do you take notes? Make drawings? Just read along in the SystemBrowser? > > Can you imagine a bit, what i mean? It is really very basic.. > Best regards, Helene. > > > laurent laffont wrote: > > > > Hi, > > > > indeed I don't really see how to do this sort of screencast ..... > > > > Which packages would you like to see explained ? > > > > Laurent > > > > On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < > > thereluctantprogrammer(a)fastmail.fm> wrote: > > > >> > >> Hi, > >> i have a proposition for a Pharo-Screencast: > >> > >> I would love to look over someoneâs shoulder while she/he is *reading* > >> code. > >> A possible plot would be to download something from squeaksource and > then > >> trying to make sense out of it - and talking while doing so. (It would > >> also > >> be good to see all the relevant functions of the browser in action). > >> > >> Background: While i have read some books now (blue book, pharo by > >> example, > >> seaside by example, best practice patterns) i have never actually seen > >> people programming. So i absolutely miss the craftsmanship side of > >> things. > >> > >> Anyway thank you for Pharocasts. > >> Best regards, > >> Helene. > >> -- > >> View this message in context: > >> > http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >> > >> > > > > > -- > View this message in context: > http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by Helene Bilbo

Hi, i donât want to see a specific package explained - i would rather like to watch, how someone will make sense of a package she/he doesnât know (and that does not have much comments..) and tries to read and understand it. I just sit here and try to understand SpectrumAnalyzerMorph - but perhaps this is a bad example, because it is included in Pharo 1.1.1 but doesnât work there. This would be more a debugging show.. What kind of âstrategyâ or âpatternâ do you use to understand a class/package? Where do i start reading in the first place? Do i search messages / try to âfollowâ them using method finder? I tried to file out classes and print them on paper - which was a bad idea.. Do you take notes? Make drawings? Just read along in the SystemBrowser? Can you imagine a bit, what i mean? It is really very basic.. Best regards, Helene. laurent laffont wrote: > > Hi, > > indeed I don't really see how to do this sort of screencast ..... > > Which packages would you like to see explained ? > > Laurent > > On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < > thereluctantprogrammer(a)fastmail.fm> wrote: > >> >> Hi, >> i have a proposition for a Pharo-Screencast: >> >> I would love to look over someoneâs shoulder while she/he is *reading* >> code. >> A possible plot would be to download something from squeaksource and then >> trying to make sense out of it - and talking while doing so. (It would >> also >> be good to see all the relevant functions of the browser in action). >> >> Background: While i have read some books now (blue book, pharo by >> example, >> seaside by example, best practice patterns) i have never actually seen >> people programming. So i absolutely miss the craftsmanship side of >> things. >> >> Anyway thank you for Pharocasts. >> Best regards, >> Helene. >> -- >> View this message in context: >> http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… >> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >> >> > > -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 28, 2011

Re: [Pharo-users] Polymorph example

by laurent laffont

The problem is that I've code it in Pharo 1.2 and use UITheme class>>smallWindowIcon to add the menu in ContactListEditor class>>menuCommandOn: But in Pharo 1.1 UITheme class>>smallWindowIcon doesn't exist (it's MenuIcon class>>smallWindowIcon). I've uploaded a new version on SqueakSource which don't use icons + some code refactoring. Cheers, Laurent On Fri, Jan 28, 2011 at 9:27 PM, Helene Bilbo < thereluctantprogrammer(a)fastmail.fm> wrote: > > Hi, > > after evaluating: > Gofer it > squeaksource: 'LaurentLSandbox'; > package: 'AddressBook'; > load. > > (Smalltalk at:#ContactListEditor) open. > > in Pharo 1.1.1 my WorldMenu is broken and a âfallback World Menuâ appears. > "World discoveredWorldMenuâ says that UIThemeWatery2 does not understand > smallWindowIcon, that is sent by ContactListEditor class>>menuCommandOn: > > How can i fix that? > > Best regards, > Helene. > -- > View this message in context: > http://forum.world.st/Polymorph-example-tp3232539p3245311.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Jan. 28, 2011

Re: [Pharo-users] Screencast proposition: Watch someone read code.

by laurent laffont

Hi, indeed I don't really see how to do this sort of screencast ..... Which packages would you like to see explained ? Laurent On Fri, Jan 28, 2011 at 5:04 PM, Helene Bilbo < thereluctantprogrammer(a)fastmail.fm> wrote: > > Hi, > i have a proposition for a Pharo-Screencast: > > I would love to look over someoneâs shoulder while she/he is *reading* > code. > A possible plot would be to download something from squeaksource and then > trying to make sense out of it - and talking while doing so. (It would also > be good to see all the relevant functions of the browser in action). > > Background: While i have read some books now (blue book, pharo by example, > seaside by example, best practice patterns) i have never actually seen > people programming. So i absolutely miss the craftsmanship side of things. > > Anyway thank you for Pharocasts. > Best regards, > Helene. > -- > View this message in context: > http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. > >

Jan. 28, 2011

Re: [Pharo-users] Polymorph example

by Helene Bilbo

Hi, after evaluating: Gofer it squeaksource: 'LaurentLSandbox'; package: 'AddressBook'; load. (Smalltalk at:#ContactListEditor) open. in Pharo 1.1.1 my WorldMenu is broken and a âfallback World Menuâ appears. "World discoveredWorldMenuâ says that UIThemeWatery2 does not understand smallWindowIcon, that is sent by ContactListEditor class>>menuCommandOn: How can i fix that? Best regards, Helene. -- View this message in context: http://forum.world.st/Polymorph-example-tp3232539p3245311.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 28, 2011

Screencast proposition: Watch someone read code.

by Helene Bilbo

Hi, i have a proposition for a Pharo-Screencast: I would love to look over someoneâs shoulder while she/he is *reading* code. A possible plot would be to download something from squeaksource and then trying to make sense out of it - and talking while doing so. (It would also be good to see all the relevant functions of the browser in action). Background: While i have read some books now (blue book, pharo by example, seaside by example, best practice patterns) i have never actually seen people programming. So i absolutely miss the craftsmanship side of things. Anyway thank you for Pharocasts. Best regards, Helene. -- View this message in context: http://forum.world.st/Screencast-proposition-Watch-someone-read-code-tp3244… Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 28, 2011

Re: [Pharo-users] Downloading a JPEG

by Sean P. DeNigris

Sean P. DeNigris wrote: > > Is there a way to save a JPEG from the web to a file in Pharo? > FileStream forceNewFileNamed: savePath do: [ :str | str binary. str nextPutAll: (httpPathString asUrl retrieveContents contents) ]. I was looking in the Url classes, forget about FileStream (and then forgot about binary). Should this be added to Zinc? I didn't see any save methods there (like Ruby's Mechanize library). I'm going to add it to MIMEDocument and open an issue. Thanks. Sean -- View this message in context: http://forum.world.st/Downloading-a-JPEG-tp3243718p3244048.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 28, 2011