findOne method

T? findOne(Node root)

Find one node matching this query inside another node.

Implementation

T? findOne(Node root) {
	// check root's children first...
	for (var child in root.children) {
		// return matching child if we find one
		if (child.runtimeType == T && matches(child as T)) {
			return child;
		}
	}
	// then check root's grandchildren and beyond
	for (var child in root.children) {
		// return matching child if we find one
		var match = findOne(child);
		if (match != null) {
			return match;
		}
	}
	// return nothing if we haven't found anything
	return null;
}