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Copy pathdom.ts
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384 lines (339 loc) · 12.6 KB
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import {logWarn} from '../utils/log';
import {throttle} from '../../utils/throttle';
import {forEach} from '../../utils/array';
import {getDuration} from '../../utils/time';
interface CreateNodeAsapParams {
selectNode: () => HTMLElement;
createNode: (target: HTMLElement) => void;
updateNode: (existing: HTMLElement) => void;
selectTarget: () => HTMLElement;
createTarget: () => HTMLElement;
isTargetMutation: (mutation: MutationRecord) => boolean;
}
interface NodePosetionWatcher {
run: () => void;
stop: () => void;
skip: () => void;
}
export function createNodeAsap({
selectNode,
createNode,
updateNode,
selectTarget,
createTarget,
isTargetMutation,
}: CreateNodeAsapParams): void {
const target = selectTarget();
if (target) {
const prev = selectNode();
if (prev) {
updateNode(prev);
} else {
createNode(target);
}
} else {
const observer = new MutationObserver((mutations) => {
const mutation = mutations.find(isTargetMutation);
if (mutation) {
unsubscribe();
const target = selectTarget();
selectNode() || createNode(target);
}
});
const ready = () => {
if (document.readyState !== 'complete') {
return;
}
unsubscribe();
const target = selectTarget() || createTarget();
selectNode() || createNode(target);
};
const unsubscribe = () => {
document.removeEventListener('readystatechange', ready);
observer.disconnect();
};
if (document.readyState === 'complete') {
ready();
} else {
// readystatechange event is not cancellable and does not bubble
document.addEventListener('readystatechange', ready);
observer.observe(document, {childList: true, subtree: true});
}
}
}
export function removeNode(node: Node | null): void {
node && node.parentNode && node.parentNode.removeChild(node);
}
export function watchForNodePosition<T extends Node>(
node: T,
mode: 'head' | 'prev-sibling',
onRestore = Function.prototype,
): NodePosetionWatcher {
const MAX_ATTEMPTS_COUNT = 10;
const RETRY_TIMEOUT = getDuration({seconds: 2});
const ATTEMPTS_INTERVAL = getDuration({seconds: 10});
const prevSibling = node.previousSibling;
let parent = node.parentNode;
if (!parent) {
throw new Error('Unable to watch for node position: parent element not found');
}
if (mode === 'prev-sibling' && !prevSibling) {
throw new Error('Unable to watch for node position: there is no previous sibling');
}
let attempts = 0;
let start: number | null = null;
let timeoutId: ReturnType<typeof setTimeout> | null = null;
const restore = throttle(() => {
if (timeoutId) {
return;
}
attempts++;
const now = Date.now();
if (start == null) {
start = now;
} else if (attempts >= MAX_ATTEMPTS_COUNT) {
if (now - start < ATTEMPTS_INTERVAL) {
logWarn(`Node position watcher paused: retry in ${RETRY_TIMEOUT}ms`, node, prevSibling);
timeoutId = setTimeout(() => {
start = null;
attempts = 0;
timeoutId = null;
restore();
}, RETRY_TIMEOUT);
return;
}
start = now;
attempts = 1;
}
if (mode === 'head') {
if (prevSibling && prevSibling.parentNode !== parent) {
logWarn('Unable to restore node position: sibling parent changed', node, prevSibling, parent);
stop();
return;
}
}
if (mode === 'prev-sibling') {
if (prevSibling!.parentNode == null) {
logWarn('Unable to restore node position: sibling was removed', node, prevSibling, parent);
stop();
return;
}
if (prevSibling!.parentNode !== parent) {
logWarn('Style was moved to another parent', node, prevSibling, parent);
updateParent(prevSibling!.parentNode);
}
}
// If parent becomes disconnected from the DOM, fetches the new head and
// save that as parent. Do this only for the head mode, as those are
// important nodes to keep.
if (mode === 'head' && !parent!.isConnected) {
parent = document.head;
// TODO: Set correct prevSibling, which needs to be the last `.darkreader` in <head> that isn't .darkeader--sync or .darkreader--cors.
}
logWarn('Restoring node position', node, prevSibling, parent);
parent!.insertBefore(node, prevSibling && prevSibling.isConnected ? prevSibling.nextSibling : parent!.firstChild);
observer.takeRecords();
onRestore && onRestore();
});
const observer = new MutationObserver(() => {
if (
(mode === 'head' && (node.parentNode !== parent || !node.parentNode!.isConnected)) ||
(mode === 'prev-sibling' && node.previousSibling !== prevSibling)
) {
restore();
}
});
const run = () => {
// TODO: remove type cast after dependency update
observer.observe(parent!, {childList: true});
};
const stop = () => {
// TODO: remove type cast after dependency update
clearTimeout(timeoutId!);
observer.disconnect();
restore.cancel();
};
const skip = () => {
observer.takeRecords();
};
const updateParent = (parentNode: Node & ParentNode | null) => {
parent = parentNode;
stop();
run();
};
run();
return {run, stop, skip};
}
export function iterateShadowHosts(root: Node | null, iterator: (host: Element) => void): void {
if (root == null) {
return;
}
const walker = document.createTreeWalker(
root,
NodeFilter.SHOW_ELEMENT,
{
acceptNode(node) {
return (node as Element).shadowRoot == null ? NodeFilter.FILTER_SKIP : NodeFilter.FILTER_ACCEPT;
},
},
);
for (
let node = ((root as Element).shadowRoot ? walker.currentNode : walker.nextNode()) as Element;
node != null;
node = walker.nextNode() as Element
) {
if (node.classList.contains('surfingkeys_hints_host')) {
continue;
}
iterator(node);
iterateShadowHosts(node.shadowRoot, iterator);
}
}
export let isDOMReady: () => boolean = () => {
return document.readyState === 'complete' || document.readyState === 'interactive';
};
export function setIsDOMReady(newFunc: () => boolean): void {
isDOMReady = newFunc;
}
const readyStateListeners = new Set<() => void>();
export function addDOMReadyListener(listener: () => void): void {
isDOMReady() ? listener() : readyStateListeners.add(listener);
}
export function removeDOMReadyListener(listener: () => void): void {
readyStateListeners.delete(listener);
}
// `interactive` can and will be fired when their are still stylesheets loading.
// We use certain actions that can cause a forced layout change, which is bad.
export function isReadyStateComplete(): boolean {
return document.readyState === 'complete';
}
const readyStateCompleteListeners = new Set<() => void>();
export function addReadyStateCompleteListener(listener: () => void): void {
isReadyStateComplete() ? listener() : readyStateCompleteListeners.add(listener);
}
export function cleanReadyStateCompleteListeners(): void {
readyStateCompleteListeners.clear();
}
if (!isDOMReady()) {
const onReadyStateChange = () => {
if (isDOMReady()) {
readyStateListeners.forEach((listener) => listener());
readyStateListeners.clear();
if (isReadyStateComplete()) {
document.removeEventListener('readystatechange', onReadyStateChange);
readyStateCompleteListeners.forEach((listener) => listener());
readyStateCompleteListeners.clear();
}
}
};
// readystatechange event is not cancellable and does not bubble
document.addEventListener('readystatechange', onReadyStateChange);
}
const HUGE_MUTATIONS_COUNT = 1000;
function isHugeMutation(mutations: MutationRecord[]) {
if (mutations.length > HUGE_MUTATIONS_COUNT) {
return true;
}
let addedNodesCount = 0;
for (let i = 0; i < mutations.length; i++) {
addedNodesCount += mutations[i].addedNodes.length;
if (addedNodesCount > HUGE_MUTATIONS_COUNT) {
return true;
}
}
return false;
}
export interface ElementsTreeOperations {
additions: Set<Element>;
moves: Set<Element>;
deletions: Set<Element>;
}
function getElementsTreeOperations(mutations: MutationRecord[]): ElementsTreeOperations {
const additions = new Set<Element>();
const deletions = new Set<Element>();
const moves = new Set<Element>();
mutations.forEach((m) => {
forEach(m.addedNodes, (n) => {
if (n instanceof Element && n.isConnected) {
additions.add(n);
}
});
forEach(m.removedNodes, (n) => {
if (n instanceof Element) {
if (n.isConnected) {
moves.add(n);
additions.delete(n);
} else {
deletions.add(n);
}
}
});
});
const duplicateAdditions: Element[] = [];
const duplicateDeletions: Element[] = [];
additions.forEach((node) => {
if (additions.has(node.parentElement as HTMLElement)) {
duplicateAdditions.push(node);
}
});
deletions.forEach((node) => {
if (deletions.has(node.parentElement as HTMLElement)) {
duplicateDeletions.push(node);
}
});
duplicateAdditions.forEach((node) => additions.delete(node));
duplicateDeletions.forEach((node) => deletions.delete(node));
return {additions, moves, deletions};
}
interface OptimizedTreeObserverCallbacks {
onMinorMutations: (root: Document | ShadowRoot, operations: ElementsTreeOperations) => void;
onHugeMutations: (root: Document | ShadowRoot) => void;
}
const optimizedTreeObservers = new Map<Node, MutationObserver>();
const optimizedTreeCallbacks = new WeakMap<MutationObserver, Set<OptimizedTreeObserverCallbacks>>();
// TODO: Use a single function to observe all shadow roots.
export function createOptimizedTreeObserver(root: Document | ShadowRoot, callbacks: OptimizedTreeObserverCallbacks): {disconnect: () => void} {
let observer: MutationObserver;
let observerCallbacks: Set<OptimizedTreeObserverCallbacks>;
let domReadyListener: () => void;
if (optimizedTreeObservers.has(root)) {
observer = optimizedTreeObservers.get(root)!;
observerCallbacks = optimizedTreeCallbacks.get(observer)!;
} else {
let hadHugeMutationsBefore = false;
let subscribedForReadyState = false;
observer = new MutationObserver((mutations: MutationRecord[]) => {
if (isHugeMutation(mutations)) {
if (!hadHugeMutationsBefore || isDOMReady()) {
observerCallbacks.forEach(({onHugeMutations}) => onHugeMutations(root));
} else if (!subscribedForReadyState) {
domReadyListener = () => observerCallbacks.forEach(({onHugeMutations}) => onHugeMutations(root));
addDOMReadyListener(domReadyListener);
subscribedForReadyState = true;
}
hadHugeMutationsBefore = true;
} else {
const elementsOperations = getElementsTreeOperations(mutations);
observerCallbacks.forEach(({onMinorMutations}) => onMinorMutations(root, elementsOperations));
}
});
observer.observe(root, {childList: true, subtree: true});
optimizedTreeObservers.set(root, observer);
observerCallbacks = new Set();
optimizedTreeCallbacks.set(observer, observerCallbacks);
}
observerCallbacks.add(callbacks);
return {
disconnect() {
observerCallbacks.delete(callbacks);
if (domReadyListener) {
removeDOMReadyListener(domReadyListener);
}
if (observerCallbacks.size === 0) {
observer.disconnect();
optimizedTreeCallbacks.delete(observer);
optimizedTreeObservers.delete(root);
}
},
};
}