public <A, T extends VoidVisitor<A>, VisType extends T, ArgType extends A> void addVoidListener(
Class<VisType> visitorType, Class<ArgType> argType, In3<T, Node, A> listener) {
addVoidListener(
(vis, arg) ->
(visitorType == null || visitorType.isInstance(vis))
&& (argType == null || argType.isInstance(arg)),
listener);
}
public <R, A, T extends GenericVisitor<R, A>, VisType extends T, ArgType extends A>
void addGenericListener(
Class<VisType> visitorType, Class<ArgType> argType, In3Out1<T, Node, A, R> listener) {
addGenericListener(
(vis, arg) ->
(visitorType == null || visitorType.isInstance(vis))
&& (argType == null || argType.isInstance(arg)),
listener);
}
public <A, S extends A> SysExpr addUniversalListener(
Class<S> argType, In2Out1<Node, A, Do> callback) {
final In2Out1<Node, Object, Do> was = universalListener;
universalListener =
(node, arg) -> {
final Do toUndo = was.io(node, arg);
if (argType.isInstance(arg) || arg == null) {
final Do undo = callback.io(node, (A) arg);
return toUndo.doAfter(undo);
}
return toUndo;
};
return this;
}