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/* NSC -- new Scala compiler
* Copyright 2005-2007 LAMP/EPFL
* @author Martin Odersky
*/
// $Id$
package scala.tools.nsc.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)
}
}
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