yoastseo/build/languageProcessing/researches/getLongCenterAlignedTexts.js

Yoast client-side content analysis

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;
var _lodash = require("lodash");
/**
 * @typedef {import("../../languageProcessing/AbstractResearcher").default } Researcher
 * @typedef {import("../../parse/structure/").Node} Node
 * @typedef {import("../../values/").Paper } Paper
 */

/**
 * The maximum allowed length of a center-aligned paragraph or heading in characters.
 * @type {number}
 */
const MAX_CENTER_ALIGNED_LENGTH = 50;

/**
 * A regular expression to match heading tags.
 * @type {RegExp}
 */
const HEADING_TAGS_REGEX = /^h[1-6]$/;

/**
 * Filters out all nodes that are center-aligned and longer than 50 characters (as defined in `MAX_CENTER_ALIGNED_LENGTH`).
 * @param {Node[]} nodes An array of nodes.
 * @param {string[]} centerClasses The classes that are used to identify center-aligned elements.
 * @returns {Node[]} An array containing all center-aligned nodes that are longer than 50 characters.
 */
function getLongCenterAlignedElements(nodes, centerClasses) {
  return nodes.filter(node => {
    if (!node.attributes.class) {
      return false;
    }

    // We convert node.attributes.class to an array so we can use the `intersection` function from lodash.
    // When the `intersection` function on Set becomes more widely available, we can remove this conversion.
    return (0, _lodash.intersection)([...node.attributes.class], centerClasses).length > 0 && node.innerText().length > MAX_CENTER_ALIGNED_LENGTH;
  });
}

/**
 * Finds all paragraphs and headings that are center-aligned and longer than 50 characters (after stripping HTML tags).
 * @param {Paper} paper The paper to analyze.
 * @param {Researcher} researcher The researcher.
 * @returns {Node[]} An array of nodes containing too long center-aligned paragraphs/headings.
 */
function _default(paper, researcher) {
  const tree = paper.getTree();
  const paragraphs = tree.findAll(node => node.name === "p");
  const headings = tree.findAll(node => HEADING_TAGS_REGEX.test(node.name));
  const centerClasses = researcher.getConfig("centerClasses");
  return getLongCenterAlignedElements(paragraphs.concat(headings), centerClasses);
}
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