Exploring Kotlin Symbol Processing

KSP example

Exploring Kotlin Symbol Processing – KSP. This is just an experiment.

Project contains 2 modules

Processing module is the one which is responsible for code generation. There are two samples: PrintProcessor and SimpleClassGeneratorProcessor.

SimpleClassGeneratorProcessor generates the class with the arguments passed to processor from Gradle
PrintProcessor generates class which prints all properties with the names and types from the class annotated with “@Print”. Also it shows how annotation parsing is done in KSP and utilizes visitor pattern.

Project uses Zac Sweers’s AutoService which is using KSP already instead of KAPT and KotlinPoet.

Keep in mind : “The reduction of build times is only applicable if there are no other processors that use KAPT.” – Source: https://developer.android.com/jetpack/androidx/releases/room#2.3.0-beta02

Processor options in SymbolProcessorEnvironment.options are specified in gradle build scripts:

  ksp {
    arg("enabled", "true")
  }

Mark directory as a “generated source root” to make it resolvable

build/generated/ksp/main/kotlin/

and also “resource directory”:

build/generated/ksp/main/resources