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kotlinlang

Hey everyone!
I am trying to fix <https://youtrack.jetbrains.com/issue/KTIJ-25064/Replace-with-safe-call-adds-redundant-elvis-operator-inside-brackets|this issue>. How do we get the function declarations and know if a particular parameter is required not null? I did go through the PSI documentation but couldn't find an appropriate article / example on how to identify if a parameter is required as not null

I tried going to the parent declaration by using `parent.context.reference.resolve()`  From there on I can get the valueParameters of the function but I am not sure how to check they are nullable or not

Any help will be appreciated thanks

IIRC resolve call will return you function descriptor from which you extract parameters as ValueParametrDescriptor
This descriptor contains its type in returnType property (or so) from which you can extract nullability of the type

Hi <@UKPEELJCW> Do we have any common place wiki or any blog or anything where I can look into common functions working and their responsibilities. I checked out the <https://plugins.jetbrains.com/docs/intellij/psi.html|documentation> but it's not exhaustive.

No, there is no such documentation for the kotlin compiler
The one your linked is about intellij idea

Yes actually I am focusing on plugins right now. So that's why

Any tips which I can follow? Right now I am navigating through the codebase and trying to understand the functionality.

But you can check Kdocs for analysis api, AFAIK it more or less documented
AA is a new API for interacting with kotlin compiler from ide for a new K2 IDE plugin (and it supports K1 too)
<https://github.com/JetBrains/kotlin/tree/master/analysis/analysis-api|https://github.com/JetBrains/kotlin/tree/master/analysis/analysis-api>

I can suggest to find parts of code in the main plugin which more or less similar to what you are trying to achieve and check how some things are done here

Got it. Will try that. 
Thanks <@UKPEELJCW>