src/compiler/scala/tools/nsc/symtab/InfoTransformers.scala


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45

/* NSC -- new scala compiler
 * Copyright 2005 LAMP/EPFL
 * @author  Martin Odersky
 */
// $Id$
package scala.tools.nsc.symtab;

trait InfoTransformers requires 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): unit = {
      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
      }
    }

    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);
  }
}