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package scala
package reflect
package internal
package tpe
private[internal] trait CommonOwners {
self: SymbolTable =>
/** The most deeply nested owner that contains all the symbols
* of thistype or prefixless typerefs/singletype occurrences in given type.
*/
protected[internal] def commonOwner(t: Type): Symbol = commonOwner(t :: Nil)
/** The most deeply nested owner that contains all the symbols
* of thistype or prefixless typerefs/singletype occurrences in given list
* of types.
*/
protected[internal] def commonOwner(tps: List[Type]): Symbol = {
if (tps.isEmpty) NoSymbol
else {
commonOwnerMap.clear()
tps foreach (commonOwnerMap traverse _)
if (commonOwnerMap.result ne null) commonOwnerMap.result else NoSymbol
}
}
protected def commonOwnerMap: CommonOwnerMap = commonOwnerMapObj
protected class CommonOwnerMap extends TypeTraverserWithResult[Symbol] {
var result: Symbol = _
def clear() { result = null }
private def register(sym: Symbol) {
// First considered type is the trivial result.
if ((result eq null) || (sym eq NoSymbol))
result = sym
else
while ((result ne NoSymbol) && (result ne sym) && !(sym isNestedIn result))
result = result.owner
}
def traverse(tp: Type) = tp.normalize match {
case ThisType(sym) => register(sym)
case TypeRef(NoPrefix, sym, args) => register(sym.owner) ; args foreach traverse
case SingleType(NoPrefix, sym) => register(sym.owner)
case _ => mapOver(tp)
}
}
private lazy val commonOwnerMapObj = new CommonOwnerMap
}
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