[Cuis-dev] [] storeString freezes the image

Nicolás Papagna Maldonado nicolas.papagna at gmail.com
Tue Oct 27 08:19:42 PDT 2020

Yay! That sounds awesome!

I'll take it for a ride tonight and let you folks know how it worked.

Nico PM

On Tue, Oct 27, 2020 at 10:55 AM Juan Vuletich <juan at jvuletich.org> wrote:

> On 10/26/2020 10:41 PM, Nicolás Papagna Maldonado via Cuis-dev wrote:
> Hi folks!
> Hope you're doing fine :)
> Just found this issue while I was trying to add a new Preference whose
> value is a block.
> Specifically, I want users to be able to configure the block that should
> be used for opening the class finder (either the default one or
> Cuis-Finder).
> The issue starts when Preferences>>compileAccessMethodForPreference: is
> evaluated: the message storeString is sent to the preference value (in
> this case a block) to create the code for its accessor method.
> Turns out that if you send storeString to a block (say [] storeString)
> the image freezes and the only way to exit is to kill the process.
> The whole thing seems to be caused by the default implementation that is
> used (Object>>storeOn:) when the first instance variable is retrieved.
> I'm not sure what a custom implementation of BlockClosure>>storeOn: or if
> it should have one at all, but if we are unable to store blocks into
> strings maybe it will be better if we fail.
> What are your thoughts?
> Cheers,
> Nico PM
> Hi Nico, Folks,
> You are lucky today! This problem is not trivial, and our friend Ken
> Dickey complained for years about not being able to store closures in
> SmartRefStreams. I finally implemented the solution about a year ago. So,
> the only thing you need is
> BlockClosure >>
> storeOn: aStream
>     aStream nextPut: $(.
>     self asSerializable storeOn: aStream.
>     aStream nextPutAll: ' asEvaluable)'
> Please try it. If this works fine for everybody, I'll push it to GitHub.
> BTW, you can browse SerializableBlockClosure to see how I did it. It took
> me many hours to get it right! This has many applications, for example, the
> ability to store any object (including SortedCollections with sortBlock,
> live Morphs, etc) on files or even the clipboard, and materializing them in
> a different image.
> Cheers,
> --
> Juan Vuletichwww.cuis-smalltalk.orghttps://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Devhttps://github.com/jvuletichhttps://www.linkedin.com/in/juan-vuletich-75611b3
> @JuanVuletich


Nicolás Papagna
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