previousNodeWhere method

Node? previousNodeWhere(bool test(Node element))

Returns the first previous node in the subtree that satisfies the given predicate

Implementation

Node? previousNodeWhere(bool Function(Node element) test) {
  var previous = this.previous;
  while (previous != null) {
    final last = previous.lastChildWhere(test);
    if (last != null) {
      return last;
    }
    if (test(previous)) {
      return previous;
    }
    previous = previous.previous;
  }
  final parent = this.parent;
  if (parent != null) {
    if (test(parent)) {
      return parent;
    }
    return parent.previousNodeWhere(test);
  }
  return null;
}