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/* NSC -- new Scala compiler
* Copyright 2005-2010 LAMP/EPFL
* @author
*/
package scala.tools.nsc
package transform
/** <p>
* A base class for transforms.
* </p>
* <p>
* A transform contains a compiler phase which applies a tree transformer.
* </p>
*/
trait InfoTransform extends Transform {
import global.{Symbol, Type, InfoTransformer, infoTransformers}
def transformInfo(sym: Symbol, tpe: Type): Type
override def newPhase(prev: scala.tools.nsc.Phase): StdPhase =
new Phase(prev)
protected def changesBaseClasses = true
protected def keepsTypeParams = true
class Phase(prev: scala.tools.nsc.Phase) extends super.Phase(prev) {
override val keepsTypeParams = InfoTransform.this.keepsTypeParams
if (infoTransformers.nextFrom(id).pid != id) {
// this phase is not yet in the infoTransformers
val infoTransformer = new InfoTransformer {
val pid = id
val changesBaseClasses = InfoTransform.this.changesBaseClasses
def transform(sym: Symbol, tpe: Type): Type = transformInfo(sym, tpe)
}
infoTransformers.insert(infoTransformer)
}
}
}
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