January 2013 - Pharo-users - lists.pharo.org

Re: [Pharo-users] Question about alias in traits

by Damien Cassou

On Thu, Jan 10, 2013 at 1:21 PM, Hernan Wilkinson <hernan.wilkinson(a)10pines.com> wrote: > Was my interpretation of Alias incorrect? or is the current implementation > of alias incorrect? (maybe due to some implementation problems?) @ is an Alias operator, not a Rename operator. That means when you alias { #m3 -> #m1 } you get a new name for the same method. So what you see is the expected behavior, as defined in the paper. And the direction of the arrow makes sense: #m3 -> #m1 is read as "m3 is a new name for m1", whereas for a Rename operator, we would probably have something like "#m1 -> #m3", i.e., m1 is renamed to m3. In a fully dynamic language, a Rename operator would be quite hard to implement I guess, IIRC Eiffel has a rename operator. -- Damien Cassou http://damiencassou.seasidehosting.st "Success is the ability to go from one failure to another without losing enthusiasm." Winston Churchill

Jan. 10, 2013

Question about alias in traits

by Hernan Wilkinson

Hi, I may have understood incorrectly the idea behind and alias when using traits, but I was expecting that when using an alias, the aliased method would be removed and all the sender of that message would be change to the new one (the alias), but I don't see that happening. Here is some code: Trait named: #SomeTrait uses: {} SomeTrait>>m1 ^ 1 SomeTrait>>m2 self m1 Object subclass: #SomeClass uses: SomeTrait @ { #m3 -> #m1} It generates: SomeClass>>m1 ^ 1 SomeClass>>m2 self m1 SomeClass>>m3 ^1 But I was specting: SomeClass>>m2 self m3 SomeClass>>m3 ^1 and the method SomeClass>>m1 removed. Was my interpretation of Alias incorrect? or is the current implementation of alias incorrect? (maybe due to some implementation problems?) Thanks! Hernan. -- *HernÃ¡n Wilkinson Agile Software Development, Teaching & Coaching* *Phone: +54 - 011 - *6091 - 3125* Mobile: +54 - 911 - 4470 - 7207 email: hernan.wilkinson(a)10Pines.com site: http://www.10Pines.com <http://www.10pines.com/>* Address: Alem 693, Floor 5 B, Buenos Aires, Argentina

Jan. 10, 2013

Re: [Pharo-users] PharoConf 2013 @ Bern?

by Sabine KnÃ¶fel

I would appreciate it, too! -- View this message in context: http://forum.world.st/PharoConf-2013-Bern-tp4658114p4662723.html Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.

Jan. 10, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Paul DeBruicker

On 01/09/2013 12:39 PM, Frank Church wrote: > > On 9 January 2013 19:30, Paul DeBruicker <pdebruic(a)gmail.com > <mailto:pdebruic@gmail.com>> wrote: > > On 01/09/2013 11:18 AM, Frank Church wrote: > > > > When I print it returns an empty array #(), but I expect to get subset > > of TextMorphForEditView allInstances. > > > > What is the likely purpose of the notNil? > > > > -- > > Frank Church > > > The #firstOwnerSuchThat: method either returns the morph that meets the > criteria specified in the block sent to it (in this instance that the > owner is a SystemWindow and its model is a Workspace) or nil. The > #select: block needs the code inside it to return a boolean, so the > #notNil converts the response from the #firstOwnerSuchThat: method into > a boolean rather than leaving it as either nil or the morph. > > > If you right click on a method and choose Implementors you can see how > each class that implements the method defines it. You can also right > click the method and choose Senders to see examples of how the method is > used. > > > Is there some reason why the expression is returning an empty collection? > > Isn't the select: meant to return the whole list? No the #select: returns only those elements for which the select block returns true. The reason why you're getting an empty collection is because the select block for every element returns false. The criteria in the #firstOwnerSuchThat: block needs to be adjusted to be more permissive. Or the starting collection is wrong. In this instance its an issue of the criteria in the #firstOwnerSuchThat: block being wrong. This one you want is this: TextMorphForEditView allInstances select: [ :morph | (morph firstOwnerSuchThat: [ :owner | (owner isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ] (I changed 'owner class isKindOf: SystemWindow' to 'owner isKindOf: SystemWindow') I'm on linux and you can shift-click (it may be option-click or commanc-click on other platforms I have no idea) the title bar of a Workspace and click 'explore' to see that workspace's instance variables. In the bottom pane of the explorer window you can test your select block's criteria to ensure it works for your desired objects. Another way to find a workspace is first close all windows then open a workspace and run Smalltalk garbageCollect then highlight the following, right click it, and choose 'explore' TextMorphForEditView allInstances The only thing in the array in the explorer window is the morph for the workspace. You can then start looking through the owners by clicking the triangle next to the #owner instance variable until you find one who's model is 'a Workspace'. That's the workspace object.

Jan. 9, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by StÃ©phane Ducasse

Hi frank select: returns the elements that satisfy the argument. If none of them works -> #() (10 20 30) select: [:each | each > 100] -> #() what else could it be? Stef On Jan 9, 2013, at 9:39 PM, Frank Church wrote: > > > On 9 January 2013 19:30, Paul DeBruicker <pdebruic(a)gmail.com> wrote: > On 01/09/2013 11:18 AM, Frank Church wrote: > > > > When I print it returns an empty array #(), but I expect to get subset > > of TextMorphForEditView allInstances. > > > > What is the likely purpose of the notNil? > > > > -- > > Frank Church > > > The #firstOwnerSuchThat: method either returns the morph that meets the > criteria specified in the block sent to it (in this instance that the > owner is a SystemWindow and its model is a Workspace) or nil. The > #select: block needs the code inside it to return a boolean, so the > #notNil converts the response from the #firstOwnerSuchThat: method into > a boolean rather than leaving it as either nil or the morph. > > > If you right click on a method and choose Implementors you can see how > each class that implements the method defines it. You can also right > click the method and choose Senders to see examples of how the method is > used. > > > Is there some reason why the expression is returning an empty collection? > > Isn't the select: meant to return the whole list? > > -- > Frank Church > > ======================= > http://devblog.brahmancreations.com

Jan. 9, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Frank Church

On 9 January 2013 19:30, Paul DeBruicker <pdebruic(a)gmail.com> wrote: > On 01/09/2013 11:18 AM, Frank Church wrote: > > > > When I print it returns an empty array #(), but I expect to get subset > > of TextMorphForEditView allInstances. > > > > What is the likely purpose of the notNil? > > > > -- > > Frank Church > > > The #firstOwnerSuchThat: method either returns the morph that meets the > criteria specified in the block sent to it (in this instance that the > owner is a SystemWindow and its model is a Workspace) or nil. The > #select: block needs the code inside it to return a boolean, so the > #notNil converts the response from the #firstOwnerSuchThat: method into > a boolean rather than leaving it as either nil or the morph. > > > If you right click on a method and choose Implementors you can see how > each class that implements the method defines it. You can also right > click the method and choose Senders to see examples of how the method is > used. > > Is there some reason why the expression is returning an empty collection? Isn't the select: meant to return the whole list? -- Frank Church ======================= http://devblog.brahmancreations.com

Jan. 9, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Paul DeBruicker

On 01/09/2013 11:18 AM, Frank Church wrote: > > When I print it returns an empty array #(), but I expect to get subset > of TextMorphForEditView allInstances. > > What is the likely purpose of the notNil? > > -- > Frank Church The #firstOwnerSuchThat: method either returns the morph that meets the criteria specified in the block sent to it (in this instance that the owner is a SystemWindow and its model is a Workspace) or nil. The #select: block needs the code inside it to return a boolean, so the #notNil converts the response from the #firstOwnerSuchThat: method into a boolean rather than leaving it as either nil or the morph. If you right click on a method and choose Implementors you can see how each class that implements the method defines it. You can also right click the method and choose Senders to see examples of how the method is used.

Jan. 9, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Frank Church

On 9 January 2013 18:32, Paul DeBruicker <pdebruic(a)gmail.com> wrote: > TextMorphForEditView allInstances > select: [ :morph | > (morph firstOwnerSuchThat: [ :owner | (owner class > isKindOf: > SystemWindow) and: [ owner model isKindOf: Workspace ] ]) > notNil ] > When I print it returns an empty array #(), but I expect to get subset of TextMorphForEditView allInstances. What is the likely purpose of the notNil? -- Frank Church ======================= http://devblog.brahmancreations.com

Jan. 9, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Paul DeBruicker

On 01/09/2013 10:26 AM, Frank Church wrote: > TextMorphForEditView allInstances select: [:morph | > morph firstOwnerSuchThat: [:owner | (owner class isKindOf: > SystemWindow) and: [ > owner model isKindOf: Workspace ] notNil ] Does this do what you want: TextMorphForEditView allInstances select: [ :morph | (morph firstOwnerSuchThat: [ :owner | (owner class isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] ]) notNil ]

Jan. 9, 2013

Re: [Pharo-users] How do I save contents of Workspace into a collection?

by Frank Church

On 8 January 2013 02:53, Igor Stasenko <siguctua(a)gmail.com> wrote: > On 8 January 2013 03:52, Igor Stasenko <siguctua(a)gmail.com> wrote: > > On 8 January 2013 02:22, Frank Church <vfclists(a)gmail.com> wrote: > >> > >> > >> On 7 January 2013 23:32, Igor Stasenko <siguctua(a)gmail.com> wrote: > >>> > >>> Workspace allInstances collect: [:ea | > >>> ea contents > >> > >> > >> Following your example I used this expression 'TextMorphForEditView > >> allInstances collect: [ :ea | ea text]'.to get the text in all the > >> TextMorphForEditView instances without have to Cmd-S them first.. > >> > >> In my case I need to know if the TextMorphForEditView belongs to a > >> Workspace. Is there a message for checking if an object is a child > object of > >> a particular class further up the hierarchy,.something along the lines > of: > >> > >> isTrue(TextMorphForEditViewObject childOf: Workspace) > >> > >> and conversely > >> > >> isTrue(WorkspaceObject parentOf: TextMorphForEditView) > >> > >> > > > > TextMorphForEditView allInstances select: [:morph | > > morph firstOwnerSuchThat: [:owner | (owner class isKindOf: > > SystemWindow) and: [ > > owner model isKindOf: Workspace ] ] > > > > something like that. > > > or this: ... > TextMorphForEditView allInstances select: [:morph | > morph firstOwnerSuchThat: [:owner | (owner class isKindOf: > SystemWindow) and: [ > owner model isKindOf: Workspace ] notNil ] > > > >> ? > >> -- > >> Frank Church > >> > >> ======================= > >> http://devblog.brahmancreations.com > > > > > > > > -- > > Best regards, > > Igor Stasenko. > > > > -- > Best regards, > Igor Stasenko. > > TextMorphForEditView allInstances select: [:morph | morph firstOwnerSuchThat: [:owner | (owner class isKindOf: SystemWindow) and: [ owner model isKindOf: Workspace ] notNil ] This code generates a syntax error. When I put the brackets where I think they should be I either get a NonBoolean receiver error or a True doesNotUndertstand value message/ -- Frank Church ======================= http://devblog.brahmancreations.com

Jan. 9, 2013