/
Positions.scala
44 lines (39 loc) · 1.46 KB
/
Positions.scala
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/*
* Scala (https://www.scala-lang.org)
*
* Copyright EPFL and Lightbend, Inc.
*
* Licensed under Apache License 2.0
* (http://www.apache.org/licenses/LICENSE-2.0).
*
* See the NOTICE file distributed with this work for
* additional information regarding copyright ownership.
*/
package scala.tools.nsc
package ast
import scala.tools.nsc.Reporting.WarningCategory
trait Positions extends scala.reflect.internal.Positions {
self: Global =>
class ValidatingPosAssigner extends PosAssigner {
var pos: Position = _
override def traverse(t: Tree): Unit = {
if (t eq EmptyTree) ()
else if (t.pos == NoPosition) super.traverse(t setPos pos)
else if (globalPhase.id <= currentRun.picklerPhase.id) {
// When we prune due to encountering a position, traverse the
// pruned children so we can warn about those lacking positions.
t.children foreach { c =>
if (!c.canHaveAttrs) ()
else if (c.pos == NoPosition) {
runReporting.warning(t.pos, " Positioned tree has unpositioned child in phase " + globalPhase, WarningCategory.OtherDebug, currentOwner)
inform("parent: " + treeSymStatus(t))
inform(" child: " + treeSymStatus(c) + "\n")
}
}
}
}
}
override protected[this] lazy val posAssigner: PosAssigner =
if (settings.Yrangepos.value && settings.isDebug || settings.Yposdebug.value) new ValidatingPosAssigner
else new DefaultPosAssigner
}