Scala example source code file (InfoTransformers.scala)

This example Scala source code file (InfoTransformers.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

boolean, id, id, infotransformer, infotransformer, infotransformers, phase, phase, symbol, symboltable, type, type

The Scala InfoTransformers.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author  Martin Odersky
 */

package scala.tools.nsc
package symtab

trait InfoTransformers {
  self: SymbolTable =>

  abstract class InfoTransformer {
    var prev: InfoTransformer = this
    var next: InfoTransformer = this

    val pid: Phase#Id
    val changesBaseClasses: Boolean
    def transform(sym: Symbol, tpe: Type): Type

    def insert(that: InfoTransformer) {
      assert(this.pid != that.pid)
      if (that.pid < this.pid) {
        prev insert that
      } else if (next.pid <= that.pid && next.pid != NoPhase.id) {
        next insert that
      } else {
        that.next = next
        that.prev = this
        next.prev = that
        this.next = that
      }
    }

    /** The InfoTransformer whose (pid == from).
     *  If no such exists, the InfoTransformer with the next
     *  higher pid.
     */
    def nextFrom(from: Phase#Id): InfoTransformer =
      if (from == this.pid) this
      else if (from < this.pid)
        if (prev.pid < from) this
        else prev.nextFrom(from);
      else if (next.pid == NoPhase.id) next
      else next.nextFrom(from)
  }
}