yoastseo/build/languageProcessing/languages/ja/customResearches/findKeyphraseInSEOTitle.js

Yoast client-side content analysis

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = _default;
var _lodash = require("lodash");
var _findKeywordFormsInString = require("../../../helpers/match/findKeywordFormsInString");
var _matchTextWithArray = _interopRequireDefault(require("../../../helpers/match/matchTextWithArray"));
var _processExactMatchRequest = _interopRequireDefault(require("../../../helpers/match/processExactMatchRequest"));
var _getContentWords = _interopRequireDefault(require("../helpers/getContentWords"));
var _matchTextWithWord = _interopRequireDefault(require("../helpers/matchTextWithWord"));
var _functionWords = _interopRequireDefault(require("../config/functionWords"));
var _getWords = _interopRequireDefault(require("../helpers/getWords"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/**
 * Checks the position of the keyphrase in the SEO title.
 *
 * @param {string} title    The SEO title of the paper.
 * @param {number} position The position of the keyphrase in the SEO title.
 *
 * @returns {number} Potentially adjusted position of the keyphrase in the SEO title.
 */
function adjustPosition(title, position) {
  // Don't do anything if position if already 0.
  if (position === 0) {
    return position;
  }

  // Retrieve the SEO title words before the keyphrase.
  let titleBeforeKeyword = title.substring(0, position);
  titleBeforeKeyword = (0, _getWords.default)(titleBeforeKeyword);
  // Retrieve the non-function words.
  titleBeforeKeyword = titleBeforeKeyword.filter(word => !_functionWords.default.includes(word));
  if ((0, _lodash.isEmpty)(titleBeforeKeyword)) {
    /*
     * Return position 0 if there are no words left in the SEO title before the keyword after filtering
     * the function words (such that "楽しい旅行" in "その楽しい旅行" is still counted as position 0).
    	 */
    return 0;
  }
  return position;
}

/**
 * Checks the occurrences of the keyphrase in the SEO title. Returns a result that contains information on
 * (1) whether all the keyphrase forms are found,
 * (2) the lowest number of the positions of the matches, and
 * (3) whether the exact match keyphrase is requested.
 *
 * @param {Object} paper 			The paper containing SEO title and keyword.
 * @param {Researcher} researcher 	The researcher to use for analysis.
 *
 * @returns {Object} An object containing these info: (1) whether all the keyphrase forms are found,
 * (2) the lowest number of the positions of the matches, and (3) whether the exact match keyphrase is requested.
 */
function _default(paper, researcher) {
  const title = paper.getTitle();
  let keyphrase = paper.getKeyword();
  const result = {
    allWordsFound: false,
    position: -1,
    exactMatchKeyphrase: false
  };

  /*
   * Check if the keyword is enclosed in quotation mark.
   * If yes, remove the quotation marks and check if the exact match of the keyphrase is found in the SEO title.
   */
  const exactMatchRequest = (0, _processExactMatchRequest.default)(keyphrase);
  if (exactMatchRequest.exactMatchRequested) {
    result.exactMatchKeyphrase = true;

    // Check if the exact match of the keyphrase is found in the SEO title and directly return the result if there is no match.
    if (!title.includes(exactMatchRequest.keyphrase)) {
      return result;
    }
    keyphrase = (0, _getContentWords.default)(exactMatchRequest.keyphrase);
    const keyphraseMatched = (0, _matchTextWithArray.default)(title, keyphrase, "ja", _matchTextWithWord.default);

    // It's an exact match if the length of the matched keyphrase is the same as the keyphrase length.
    if (keyphraseMatched.matches.length === keyphrase.length) {
      result.allWordsFound = true;
      result.position = adjustPosition(title, keyphraseMatched.position);
    }
    /*
     * When the exact match process is requested, we don't need to run the check for the different word forms,
     * and return the result here.
     */
    return result;
  }

  // Get the forms of the keyphrase (using the morphology research).
  const keyphraseForms = researcher.getResearch("morphology").keyphraseForms;
  const separateWordFormsMatched = (0, _findKeywordFormsInString.findWordFormsInString)(keyphraseForms, title, "ja", _matchTextWithWord.default);
  if (separateWordFormsMatched.percentWordMatches === 100) {
    result.allWordsFound = true;
    result.position = adjustPosition(title, separateWordFormsMatched.position);
  }
  return result;
}
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