Is somebody aware of tiny Kotlin compiler plugin t...

# compiler

[ralf]

Is somebody aware of tiny Kotlin compiler plugin that generates new code with the PackageFragmentProviderExtension? I’m always looking at the Android Synthetic implementation, but it’s quite complicated.

My goal is only to generate a new top level property without a setter in a new package. I see good examples how to generate the property here: https://github.com/JetBrains/kotlin/blob/5636227857545fb11ae2790fca55934b0f88a468/plugins/android-extensions/android-extensions-compiler/src/org/jetbrains/kotlin/android/synthetic/res/syntheticDescriptorGeneration.kt Only the PackageFragmentProvider code is extremely confusing.

[shikasd]

I did not see tiny ones, but I think you only need to provide package fragment with this property descriptor.

[shikasd]

IIRC, something like that

class T : PackageFragmentProvider {
    override fun getPackageFragments(fqName: FqName): List<PackageFragmentDescriptor> =
        when (fqName == "me.shika") {
            true -> listOf(customDescriptor)
            false -> emptyList()
        }

    class CustomDescriptor : PackageFragmentDescriptorImpl() {
        override fun getMemberScope(): MemberScope =
            object : MemberScopeImpl() {
                override fun getContributedFunctions(
                    name: Name,
                    location: LookupLocation
                ): Collection<SimpleFunctionDescriptor> =
                    if (name == "myCustomProp") {
                        listOf(genProperty(name))
                    } else {
                        emptyList()
                    }
            }
    }
}

[shikasd]

oh, that one is for functions, but props are similar I guess 🙂

[shikasd]

Also Raul pointed out that some descriptors (like top level functions) don't play nicely sometimes
I didn't test much, but that could be a possibility

[ralf]

That’s nice, I’ll give this a try. Thank you!

[shikasd]

sure, let me know if you have any success with making it work 🙂