Scala example source code file (TemplateTraverseComponent.scala)

This example Scala source code file (TemplateTraverseComponent.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

compilationunit, foreachtreetraverser, list, phase, phase, plugincomponent, templatetraversecomponent, traverser, traverser, traverserphase, traverserphase, tree, tree, unit

The Scala TemplateTraverseComponent.scala source code

package plugintemplate

import scala.tools.nsc._
import scala.tools.nsc.plugins.PluginComponent

/** This class implements a plugin component using a tree
 *  traverser */
class TemplateTraverseComponent (val global: Global) extends PluginComponent {
  import global._
  import global.definitions._

  val runsAfter = List[String]("refchecks")
  /** The phase name of the compiler plugin
   *  @todo Adapt to specific plugin.
   */
  val phaseName = "plugintemplatetraverse"

  def newPhase(prev: Phase): Phase = new TraverserPhase(prev)
  class TraverserPhase(prev: Phase) extends StdPhase(prev) {
    def apply(unit: CompilationUnit) {
      newTraverser().traverse(unit.body)
    }
  }

  def newTraverser(): Traverser = new ForeachTreeTraverser(check)

  def check(tree: Tree): Unit = tree match {
    case Apply(fun, args) =>
      println("traversing application of "+ fun)
    case _ => ()
  }
}