WIP

frontend/src/main.scala

@@ -29,7 +29,7 @@ case class JobAttributes(
 
   val jobAttributes = Var(Option.empty[JobAttributes])
 
-  val text = Var(SaveState.readString(SaveState.TEXT_KEY))
+  val text = Var(SaveState.readString(SaveState.TEXT_KEY, DEFAULT_TEXT))
 
   val generations = Var(
     SaveState.readString(SaveState.GENERATIONS_KEY).toIntOption.getOrElse(100)
@@ -287,3 +287,33 @@ def renderStats(stats: Stats) = div(
       li(cls := "ml-2", strong(job.id.toString), " : ", job.hearbeat)
   )
 )
+
+val DEFAULT_TEXT =
+  """
+  abstract class MemberDefTraverser extends Traverser {
+    def onMember(defn: MemberDef): Unit
+
+    private var depth: Int = 0
+    private def lower[T](body: => T): T = {
+      depth += 1
+      try body finally depth -= 1
+    }
+    def currentDepth = depth
+
+    /** Prune this tree and all trees beneath it. Can be overridden. */
+    def prune(md: MemberDef): Boolean = (
+         md.mods.isSynthetic
+      || md.mods.isParamAccessor
+      || nme.isConstructorName(md.name)
+      || (md.name containsName nme.ANON_CLASS_NAME)
+    )
+
+    override def traverse(t: Tree): Unit = t match {
+      case md: MemberDef if prune(md) =>
+      case md @ PackageDef(_, stats)  => traverseTrees(stats)
+      case md: ImplDef                => onMember(md) ; lower(traverseTrees(md.impl.body))
+      case md: ValOrDefDef            => onMember(md) ; lower(traverse(md.rhs))
+      case _                          => super.traverse(t)
+    }
+  }
+"""