trying to build a compiler plugin that targets cla...

# arrow-meta

[stojan]

trying to build a compiler plugin that targets classes annotated with @ValueClass and generates toString equals and hashCode (without copy)

I figured out how to generate toString and hashCode (working on equals next, and probably componentX)
I figured out how to add functions to a class (Based on the Lens plugin)

question: how would I add this code only to classes annotated with @ValueClass ?

private fun isValueClass(ktClass: KtClass): Boolean =
    !ktClass.isData() &&
        ktClass.primaryConstructorParameters.isNotEmpty() &&
        ktClass.primaryConstructorParameters.all { !it.isMutable } &&
        ktClass.typeParameters.isEmpty()

missing a check for my annotation ☝️

[raulraja]

Checkout the higher kind plugin. It checks for the annotation value

[raulraja]

It's in the meta sources in master. Sorry on my phone now.

[raulraja]

https://github.com/arrow-kt/arrow-meta/blob/master/compiler-plugin/src/main/kotlin/arrow/meta/plugins/higherkind/HigherKindPlugin.kt#L96

[stojan]

Thanks

[raulraja]

don’t forget supertypes etc for the class

[raulraja]

or it will break the structure. Checkout the full id template for the classes

[raulraja]

the template may have some flaws since the string it’s not typechecked by ank

[raulraja]

I see some weird }

[stojan]

I based it on this one: https://github.com/arrow-kt/arrow-meta/blob/45b44f898225674c631d809330b4990eddefc289/compiler-plugin/src/main/kotlin/arrow/meta/plugins/optics/LensPlugin.kt#L37

[raulraja]

that plugin needs to be rewritten, lenses will be projected by type proofs that are autogenerated so no need for class expansion in quotes

[stojan]

anyway, even with the lack of documentation, this took an afternoon to write..... so great job with arrow-meta all of you ❤️