TASTy Inspection

libraryDependencies += "ch.epfl.lamp" %% "dotty-tasty-inspector" % scalaVersion.value

TASTy files contain the full typed tree of a class including source positions and documentation. This is ideal for tools that analyze or extract semantic information of the code. To avoid the hassle of working directly with the TASTy file we provide the TastyInspector which loads the contents and exposes it through the TASTy reflect API.

Inspecting TASTy files

To inspect the TASTy Reflect trees of a TASTy file a consumer can be defined in the following way.

import scala.tasty.Reflection
import scala.tasty.file._

class Consumer extends TastyInspector {
  final def apply(reflect: Reflection)(root: reflect.Tree): Unit = {
    import reflect._
    // Do something with the tree

Then the consumer can be instantiated with the following code to get the tree of the class foo.Bar for a foo in the classpath.

object Test {
  def main(args: Array[String]): Unit = {
    InspectTasty("", List("foo.Bar"), new Consumer)

Note that if we need to run the main (in an object called Test) after compilation we need make available the compiler to the runtime:

dotc -d out Test.scala
dotr -with-compiler -classpath out Test

Template project

Using sbt version 1.1.5+, do:

sbt new lampepfl/dotty-tasty-inspector.g8

in the folder where you want to clone the template.