Function propagate

src/system.ts:118–174

(link: Link, innerWrite: boolean)

	}

	function propagate(link: Link, innerWrite: boolean): void {
		let next = link.nextSub;
		let stack: Stack<Link | undefined> | undefined;

		top: do {
			const sub = link.sub;
			let flags = sub.flags;

			if (!(flags & (ReactiveFlags.RecursedCheck | ReactiveFlags.Recursed | ReactiveFlags.Dirty | ReactiveFlags.Pending))) {
				sub.flags = flags | ReactiveFlags.Pending;
				if (innerWrite) {
					sub.flags |= ReactiveFlags.Recursed;
				}
			} else if (!(flags & (ReactiveFlags.RecursedCheck | ReactiveFlags.Recursed))) {
				flags = ReactiveFlags.None;
			} else if (!(flags & ReactiveFlags.RecursedCheck)) {
				sub.flags = (flags & ~ReactiveFlags.Recursed) | ReactiveFlags.Pending;
			} else if (!(flags & (ReactiveFlags.Dirty | ReactiveFlags.Pending)) && isValidLink(link, sub)) {
				sub.flags = flags | (ReactiveFlags.Recursed | ReactiveFlags.Pending);
				flags &= ReactiveFlags.Mutable;
			} else {
				flags = ReactiveFlags.None;
			}

			if (flags & ReactiveFlags.Watching) {
				notify(sub);
			}

			if (flags & ReactiveFlags.Mutable) {
				const subSubs = sub.subs;
				if (subSubs !== undefined) {
					const nextSub = (link = subSubs).nextSub;
					if (nextSub !== undefined) {
						stack = { value: next, prev: stack };
						next = nextSub;
					}
					continue;
				}
			}

			if ((link = next!) !== undefined) {
				next = link.nextSub;
				continue;
			}

			while (stack !== undefined) {
				link = stack.value!;
				stack = stack.prev;
				if (link !== undefined) {
					next = link.nextSub;
					continue top;
				}
			}

			break;
		} while (true);
	}