chrome/browser/resources/commerce/product_specifications/utils.ts

// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import {assert} from 'chrome://resources/js/assert.js';

export interface UrlListEntry {
  title: string;
  url: string;
  imageUrl: string;
}

export function getAbbreviatedUrl(urlString: string) {
  const url = new URL(urlString);
  // Chrome URLs should all have been filtered out.
  assert(url.protocol !== 'chrome:');

  let abbreviatedUrl = url.host;

  // We intentionally only check the start of the host for "www." as that string
  // can appear in other parts of the name.
  if (abbreviatedUrl.startsWith('www.')) {
    abbreviatedUrl = abbreviatedUrl.substring(4);
  }
  return abbreviatedUrl;
}

/**
 * Queries |selector| on |element|'s shadow root and returns the resulting
 * element if there is any.
 */
export function $$<K extends keyof HTMLElementTagNameMap>(
    element: Element, selector: K): HTMLElementTagNameMap[K]|null;
export function $$<K extends keyof SVGElementTagNameMap>(
    element: Element, selector: K): SVGElementTagNameMap[K]|null;
export function $$<E extends Element = Element>(
    element: Element, selector: string): E|null;
export function $$(element: Element, selector: string) {
  return element.shadowRoot!.querySelector(selector);
}

/**
 * @param uuid The UUID to validate.
 * @returns Whether the UUID is a valid lowercase UUID.
 */
export function isValidLowercaseUuid(uuid: string): boolean {
  if (uuid.length !== 36) {
    return false;
  }

  for (let i = 0; i < uuid.length; i++) {
    const char = uuid.charAt(i);

    // Check for hyphens.
    if (i === 8 || i === 13 || i === 18 || i === 23) {
      if (char !== '-') {
        return false;
      }
      continue;
    }

    // Check that all other characters are lowercase hex digits.
    if ((char < '0' || char > '9') && (char < 'a' || char > 'f')) {
      return false;
    }
  }

  return true;
}