all files / lighthouse-core/driver/gatherers/ html-without-javascript.js

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/**
 * @license
 * Copyright 2016 Google Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
'use strict';
 
/* Note that this returns the innerText of the <body> element, not the HTML. */
 
const HTML = require('./html');
 
/* global document, __returnResults */
 
/* istanbul ignore next */
function getBodyText() {
  // note: we use innerText, not textContent, because textContent includes the content of <script> elements!
  const body = document.querySelector('body');
  // __returnResults is magically inserted by driver.evaluateAsync
  __returnResults(body ? body.innerText : '');
}
 
class HTMLWithoutJavaScript extends HTML {
 
  beforePass(options) {
    options.disableJavaScript = true;
  }
 
  afterPass(options) {
    // Reset the JS disable.
    options.disableJavaScript = false;
 
    const driver = options.driver;
 
    this.artifact = {};
    return driver.evaluateAsync(`(${getBodyText.toString()}())`)
    .then(result => {
      this.artifact = result;
    })
    .catch(_ => {
      this.artifact = {
        value: -1,
        debugString: 'Unable to get document body innerText'
      };
    });
  }
}
 
module.exports = HTMLWithoutJavaScript;