/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

export function html(html: string): Element {
  // Don't return `body` itself, because using it as a `$rootElement` for ng1
  // will attach `$injector` to it and that will affect subsequent tests.
  const body = document.body;
  body.innerHTML = `<div>${html.trim()}</div>`;
  const div = document.body.firstChild as Element;

  if (div.childNodes.length === 1 && div.firstChild instanceof HTMLElement) {
    return div.firstChild;
  }

  return div;
}

export function multiTrim(text: string | null | undefined): string {
  if (typeof text == 'string') {
    return text.replace(/\n/g, '').replace(/\s\s+/g, ' ').trim();
  }
  throw new Error('Argument can not be undefined.');
}

export function nodes(html: string) {
  const div = document.createElement('div');
  div.innerHTML = html.trim();
  return Array.prototype.slice.call(div.childNodes);
}