yoastseo/build/languageProcessing/researches/metaDescriptionKeyword.js

Yoast client-side content analysis

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;
var _matchTextWithArray = _interopRequireDefault(require("../helpers/match/matchTextWithArray"));
var _getSentences = _interopRequireDefault(require("../helpers/sentence/getSentences"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/**
 * Replaces found keyword forms in the given description.
 *
 * @param {string}      description         The description to remove the matched keyword forms from.
 * @param {Object[]}    matchedKeywordForms The matched keyword forms to remove from the description.
 * @param {Number}      maxToRemove         The maximum amount of matches of each individual keyword to remove.
 *
 * @returns {string} The description with the keywords removed.
 */
const replaceFoundKeywordForms = function (description, matchedKeywordForms, maxToRemove) {
  // Replace matches so we do not match them for synonyms.
  matchedKeywordForms.forEach(keywordForm => keywordForm.matches.slice(0, maxToRemove).forEach(match => {
    description = description.replace(match, "");
  }));
  return description;
};

/**
 * Counts the number of full keyphrase matches in the given sentence. Takes synonyms into account.
 * A full keyphrase is when all keywords in the keyphrase match.
 *
 * @param {string}      sentence        The sentence that needs to be analyzed.
 * @param {Object}      topicForms      The keyphrase (and its optional synonyms') word forms.
 * @param {string}      locale          The current locale.
 * @param {function}    matchWordCustomHelper   The language-specific helper function to match word in text.
 *
 * @returns {Number} The number of matched keyphrases in the sentence.
 */
const matchPerSentence = function (sentence, topicForms, locale, matchWordCustomHelper) {
  // Focus keyphrase matches.
  const matchesKeyphrase = topicForms.keyphraseForms.map(keywordForms => (0, _matchTextWithArray.default)(sentence, keywordForms, locale, matchWordCustomHelper));
  // Count the number of matches that contain every word in the entire keyphrase.
  const fullKeyphraseMatches = Math.min(...matchesKeyphrase.map(match => match.count));

  // Replace all full keyphrase matches so we do not match them for synonyms.
  sentence = replaceFoundKeywordForms(sentence, matchesKeyphrase, fullKeyphraseMatches);

  // Keyphrase synonyms matches.
  const fullSynonymsMatches = topicForms.synonymsForms.map(synonymForms => {
    // Synonym keyphrase matches.
    const matches = synonymForms.map(keywordForms => (0, _matchTextWithArray.default)(sentence, keywordForms, locale, matchWordCustomHelper));
    // Count the number of matches that contain every word in the entire synonym keyphrase.
    const fullSynonymMatches = Math.min(...matches.map(match => match.count));
    // Replace all full matches so we do not match them for other synonyms.
    sentence = replaceFoundKeywordForms(sentence, matchesKeyphrase, fullSynonymMatches);
    return fullSynonymMatches;
  });
  return [fullKeyphraseMatches, ...fullSynonymsMatches].reduce((sum, count) => sum + count, 0);
};

/**
 * Counts the number of full keyphrase matches in the description.
 *
 * @param {Paper}       paper       The paper object containing the description.
 * @param {Researcher}  researcher  The researcher object to gather researchers from.
 *
 * @returns {Number} The number of keyphrase matches for the entire description.
 */
function _default(paper, researcher) {
  const description = paper.getDescription();
  const locale = paper.getLocale();
  const topicForms = researcher.getResearch("morphology");
  const matchWordCustomHelper = researcher.getHelper("matchWordCustomHelper");
  const memoizedTokenizer = researcher.getHelper("memoizedTokenizer");
  const sentences = (0, _getSentences.default)(description, memoizedTokenizer);
  const sentenceMatches = sentences.map(sentence => matchPerSentence(sentence, topicForms, locale, matchWordCustomHelper));
  return sentenceMatches.reduce((sum, count) => sum + count, 0);
}
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