Lift JS AST stuff

[Joe Barnes]

Yesterday I had to use some of our JS AST type stuff to get my clustering example working, and I had forgotten how difficult I sometimes find it.  I know what JS I want in my head, and it takes a bit of effort to remember what I need in Lift to produce it.  Using JsRaw is always an option, but that always feels more like I'm quitting and losing any type checking I could otherwise have.  

Have any of you been thinking about ways to improve this?  I'm curious if string interpolation would work well here.  I feel that quasiquotes are a strong indicator that it can work well.  The biggest challenge of course will be actually parsing the JS string, but maybe Nashorn/Rhino has some capabilities we could leverage.  Perhaps we could have a jsexp interpolater that checks that the string is parseable and a jscmd that checks that the string is a full command.

Thoughts?

Joe

[Antonio Salazar Cardozo]

I have a way I've improved this: “don't”.

IMO, if you want to write JS, write JS. Use a minimal abstraction layer to communicate

from Lift—whether those are events on `document` or the streaming promises David put

into Lift 3, either way. Or use, a full abstraction like Scala.js (zero experience here). But

trying to do properly-typed JS the way that our JsExp stuff currently does is, IMO, simply

adding cognitive overhead where it's not needed by trying to shoehorn JS into a state

it doesn't want to exist in.

Then again, I'm a strong “separation of concerns” advocate, and I'm a strong “let your

environment guide you to the truth” advocate, and so I think keeping JS in JS helps

enforce the separation of browser vs server concerns very effectively.

Thanks,

Antonio

[Joe Barnes]

I agree in that one should write very little JS in your Scala/Lift code.  It should just call functions you otherwise have written in JS.

My idea is to cover the cases when you do embed JS code.  I guess another take on it is that we should do it so little and infrequently it isn't worth having String Interpolation to help.

Joe

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[David Pollak]

+1

The Js abstractions never really jelled... I use JsRaw most places.

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