Does anyone have a small example besides SQLdelight on how to generate Kotlin files with PSI ?

# multiplatform

[Imran/Malic]

Does anyone have a small example besides SQLdelight on how to generate Kotlin files with PSI ?

[Dominaezzz]

PSI?

[r4zzz4k]

@Dominaezzz that's IntelliJ's framework for working with code representation: https://www.jetbrains.org/intellij/sdk/docs/basics/architectural_overview/psi.html

[alec]

SQLDelight is the only library I know of that does this

[alec]

Only other possibility would be intellij source code - maybe some of the old java features for generating getters and setters

[louiscad]

Is there a reason you used PSI and not Square's own KotlinPoet to generate Kotlin code in SQLDelight?

[alec]

We use kotlinpoet

[alec]

PSI is the AST abstraction for parsing sql

[alec]

Lint is another tool that uses it, but for static analysis and not codegen

[alec]

Most tools use APT for their AST layer instead of PSI

[Imran/Malic]

Yeah, but I just need a small example something along the lines of
ExampleClass.kt

data class ExampleClass(val hello:String = "Hello"){
  companion object {}
}

How can I get all the information of this class with PSI and generate for instance a generic function foo which prints the hello variable to the console?

[Imran/Malic]

@r4zzz4k Do you have a more descriptive docu

[r4zzz4k]

@Imran/Malic no, I didn't work with it myself yet.

[Imran/Malic]

ok

[Imran/Malic]

Hi @alec, I am working through your psi lib. Can you explain, how or where you tell an annotation that it has a processor in MPP, so not the google service API.

[Imran/Malic]

I tried this:
annotation:

@Retention(RUNTIME)
@Target(CLASS)
@MustBeDocumented
annotation class higherkind

processor:

abstract class HigherKindProcessor : Annotator {
    override fun annotate(element: PsiElement, holder: AnnotationHolder) {
        val tree = element.containingFile.children
        tree.forEach { println(it.text) }
    }
}

I want to do some codegen later on, but even that snippet within the annotation methode is not executed, if I create an object of an class

[alec]

how are you loading a PSI environment? There's no direct api to do that, you have to start one up manually using a MockApplication