Re: [Pharo-users] MetaLink>>level: failing?

Nov. 7, 2018

      Hi,

I added 

	https://pharo.fogbugz.com/f/cases/22642/instead-links-and-meta-level-origina...

as a workaround, you can use a #before link with an explicit return:

choice := true.
link := MetaLink new metaObject: [ :object :selector :arguments :context | 
                                              UIManager default alert: 'Linked Version'.
                                              choice ifTrue: [ context sender sender sender sender return: (object perform: selector withArguments: arguments)].
                                           ];         
                selector: #value:value:value:value:;
                 arguments: #(#object #selector #arguments #context);
                 control: #before;
		 level: 0.

(TestMetaLink >> #execute) ast link: link.
TestMetaLink new execute.
link uninstall.

(yes, the  context sender sender sender  shows that #context needs to do the right thing when using  level: 0. or notâ¦ another thing to fix)

	Marcus
...
On 7 Nov 2018, at 15:08, Marcus Denker <marcus.denker@inria.fr> wrote:
Hello,
I added a fist issue (and fix) for parts of the problem
https://pharo.fogbugz.com/f/cases/22641/Semantic-analysis-needs-to-take-inst... <https://pharo.fogbugz.com/f/cases/22641/Semantic-analysis-needs-to-take-inst...>
https://github.com/pharo-project/pharo/pull/1960 <https://github.com/pharo-project/pharo/pull/1960>
But after this, it does not work as the level just turns off calling the meta level code, but does not execute the
original code where the #instead is put.
(#instead in general needs more work in this implementation).
I will open another issue for that.
Marcus
...
On 31 Oct 2018, at 18:03, Vitor Medina Cruz <vitormcruz@gmail.com <mailto:vitormcruz@gmail.com>> wrote:
Thanks! Is there an issue on fogbuzz where I can be notified of resolution? Do you need me to create it?
After that how can update the code? Software update is safe or should I create a new image?
regards,
Vitor
On Mon, Oct 29, 2018 at 12:08 PM Marcus Denker <marcus.denker@inria.fr <mailto:marcus.denker@inria.fr>> wrote:
...
On 25 Oct 2018, at 01:33, Vitor Medina Cruz <vitormcruz@gmail.com <mailto:vitormcruz@gmail.com>> wrote:
Hello,
I am playing with MetaLink, really cool!, but I am having issues that I am unsure if it's some erro or if I am doing something wrong (I am using Pharo 6.1 32 bits in windows.). Consider:
TestMetaLink>>execute
    UIManager default alert: 'Actual Version'.
And in Playground:
| link |
link := MetaLink new metaObject: [ :object | UIManager default alert: 'Linked Version' ];        
                selector: #value:;
                 arguments: #(#object);
                 control: #instead.
(TestMetaLink >> #execute) ast link: link.
TestMetaLink new execute.
link uninstall.
This works as expected, an alert with 'Linked Version' is promped. But then suppose I want to execute the actual node alongside with the linked one considering some condition:
| link choice |
choice := true.
link := MetaLink new metaObject: [ :object :selector :arguments | 
                                              UIManager default alert: 'Linked Version'.
                                              choice ifTrue: [ object perform: selector withArguments: arguments].
                                           ];         
                selector: #value:value:value:;
                 arguments: #(#object #selector #arguments);
                 control: #instead;
                 level: 0.
(TestMetaLink >> #execute) ast link: link.
TestMetaLink new execute.
link uninstall.
As I understand, level:0 is necessary in order to avoid an infinite loop, but then I get an error:
KeyNotFound: key #RFArgumentsReificationVar not found in Dictionary
Am I doing something wrong? Is that an error?
Hello,
Yes, this looks like a bug. I will fix it over the next days.
Marcus