@NotNull
public static Set<JetElement> findRootExpressions(
@NotNull Collection<JetElement> unreachableElements) {
Set<JetElement> rootElements = new HashSet<JetElement>();
final Set<JetElement> shadowedElements = new HashSet<JetElement>();
JetVisitorVoid shadowAllChildren =
new JetVisitorVoid() {
@Override
public void visitJetElement(@NotNull JetElement element) {
if (shadowedElements.add(element)) {
element.acceptChildren(this);
}
}
};
for (JetElement element : unreachableElements) {
if (shadowedElements.contains(element)) continue;
element.acceptChildren(shadowAllChildren);
rootElements.removeAll(shadowedElements);
rootElements.add(element);
}
return rootElements;
}
