tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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util.ts (1749B)

      1 /**
      2 * @license
      3 * Copyright 2024 Google Inc.
      4 * SPDX-License-Identifier: Apache-2.0
      5 */
      6 const HIDDEN_VISIBILITY_VALUES = ['hidden', 'collapse'];
      7 
      8 /**
      9 * @internal
     10 */
     11 export const checkVisibility = (
     12  node: Node | null,
     13  visible?: boolean,
     14 ): Node | boolean => {
     15  if (!node) {
     16    return visible === false;
     17  }
     18  if (visible === undefined) {
     19    return node;
     20  }
     21  const element = (
     22    node.nodeType === Node.TEXT_NODE ? node.parentElement : node
     23  ) as Element;
     24 
     25  const style = window.getComputedStyle(element);
     26  const isVisible =
     27    style &&
     28    !HIDDEN_VISIBILITY_VALUES.includes(style.visibility) &&
     29    !isBoundingBoxEmpty(element);
     30  return visible === isVisible ? node : false;
     31 };
     32 
     33 function isBoundingBoxEmpty(element: Element): boolean {
     34  const rect = element.getBoundingClientRect();
     35  return rect.width === 0 || rect.height === 0;
     36 }
     37 
     38 const hasShadowRoot = (node: Node): node is Node & {shadowRoot: ShadowRoot} => {
     39  return 'shadowRoot' in node && node.shadowRoot instanceof ShadowRoot;
     40 };
     41 
     42 /**
     43 * @internal
     44 */
     45 export function* pierce(root: Node): IterableIterator<Node | ShadowRoot> {
     46  if (hasShadowRoot(root)) {
     47    yield root.shadowRoot;
     48  } else {
     49    yield root;
     50  }
     51 }
     52 
     53 /**
     54 * @internal
     55 */
     56 export function* pierceAll(root: Node): IterableIterator<Node | ShadowRoot> {
     57  root = pierce(root).next().value;
     58  yield root;
     59  const walkers = [document.createTreeWalker(root, NodeFilter.SHOW_ELEMENT)];
     60  for (const walker of walkers) {
     61    let node: Element | null;
     62    while ((node = walker.nextNode() as Element | null)) {
     63      if (!node.shadowRoot) {
     64        continue;
     65      }
     66      yield node.shadowRoot;
     67      walkers.push(
     68        document.createTreeWalker(node.shadowRoot, NodeFilter.SHOW_ELEMENT),
     69      );
     70    }
     71  }
     72 }