Is it possible to define an instance method in tag-based CSP?

Question

Question

Timothy Leavitt · May 10, 2023

In a tag-based CSP page, I can define (e.g.):

Is there any way to use this syntax to define an *instance* method (i.e., Method rather than ClassMethod) in the generated class?

Product version: IRIS 2023.1

Discussion (12)3

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Timothy Leavitt · May 10, 2023

Turns out that it's as simple as putting classmethod="0" in your <script> tag... and then getting a helpful error message on compilation that you can't actually do that in a CSP page. 😂

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Enrico Parisi · May 10, 2023

Create a new class, say myCSP.WebSocket, that extends %CSP.WebSocket.

Add your instance method to myCSP.WebSocket class and use it as superclass of your CSP page(s).

Enrico

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score 0 · Answer 1 · 2023-05-10T09:57:13-04:00

Supposing it's possible, does it make sense? Note that it's a genuine question, a doubt I have.

What would be the instance (i.e. $this) of the method?

Enrico

score 0 · Answer 2 · 2023-05-10T10:28:52-04:00

That's a fair question. In my specific case, I'm trying to write a tag-based CSP page that extends %CSP.WebSocket, which involves overriding instance methods.

score 4 · Answer 3 · 2023-05-10T10:36:43-04:00

On the other hand, if you use:

classmethod="##(+$Piece($STACK($STACK-3,"PLACE"),"+",2)<10)##"

Then it'll happily compile instance methods, and your successor and someone in the WRC will have probably a good laugh when your application randomly breaks in 2-10 years.

Preoccupied scientists | Your Scientists Were So Preoccupied With Whether Or Not They Could, They Didn't Stop To Think If They Should | Know Your Meme

score 0 · Answer 4 · 2023-05-10T10:55:21-04:00

Ben Spead · May 10, 2023

well played :)

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score 0 · Answer 5 · 2023-05-10T10:49:06-04:00

This is a much cleaner option, of course. :)

(I have other constraints that led me to not go this route in the first place.)

score 0 · Answer 6 · 2023-05-10T12:35:29-04:00

In fact, even subclassing %CSP.WebSocket or adding your instance methods class as superclass would not work because all the code you write inside a CSP page run in class methods, so you cannot call an instance method.

And this brings back my initial question:

What would be the instance (i.e. $this) of the method?

None I think, within a CSP page code there is no current instance, the "page" is not instantiated, even when using %CSP.WebSocket as superclass.

But...how are you using %CSP.WebSocket??

Something like:
<CSP:CLASS SUPER="%CSP.WebSocket">

Or what/how?

Enrico

score 0 · Answer 7 · 2023-05-16T08:13:36-04:00

Timothy Leavitt · May 16, 2023

Yes, that was how I was trying to.

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score 0 · Answer 8 · 2023-05-12T06:59:00-04:00

Have used "%" variables to share context between a chain of sequentially executing classmethods on a CSP page.

This means enriching existing %request.Data variable, as it is already there and instrumented for Dump, or can use a different % variable name.

score 1 · Answer 9 · 2023-05-16T08:15:12-04:00

Solution was ultimately to just use a class and the CSPURL parameter. (Context: https://github.com/intersystems/git-source-control/pull/255 )

score 0 · Answer 10 · 2023-05-16T08:41:55-04:00

In a tag-based CSP page...

just use a class and the CSPURL parameter

Well, that's a change of the game! 😁

Enrico

Is it possible to define an *instance* method in tag-based CSP?

Is it possible to define an instance method in tag-based CSP?