Method get_node_or_null

scene/main/node.cpp:1868–1928

}

Node *Node::get_node_or_null(const NodePath &p_path) const {
	ERR_THREAD_GUARD_V(nullptr);
	if (p_path.is_empty()) {
		return nullptr;
	}

	ERR_FAIL_COND_V_MSG(!data.tree && p_path.is_absolute(), nullptr, "Can't use get_node() with absolute paths from outside the active scene tree.");

	Node *current = nullptr;
	Node *root = nullptr;

	if (!p_path.is_absolute()) {
		current = const_cast<Node *>(this); //start from this
	} else {
		root = const_cast<Node *>(this);
		while (root->data.parent) {
			root = root->data.parent; //start from root
		}
	}

	for (int i = 0; i < p_path.get_name_count(); i++) {
		StringName name = p_path.get_name(i);
		Node *next = nullptr;

		if (name == SNAME(".")) {
			next = current;

		} else if (name == SNAME("..")) {
			if (current == nullptr || !current->data.parent) {
				return nullptr;
			}

			next = current->data.parent;
		} else if (current == nullptr) {
			if (name == root->get_name()) {
				next = root;
			}

		} else if (name.is_node_unique_name()) {
			Node **unique = current->data.owned_unique_nodes.getptr(name);
			if (!unique && current->data.owner) {
				unique = current->data.owner->data.owned_unique_nodes.getptr(name);
			}
			if (!unique) {
				return nullptr;
			}
			next = *unique;
		} else {
			next = nullptr;
			const Node *const *node = current->data.children.getptr(name);
			if (node) {
				next = const_cast<Node *>(*node);
			} else {
				return nullptr;
			}
		}
		current = next;
	}