yoastseo/build/languageProcessing/helpers/morphology/exceptionListHelpers.js

Yoast client-side content analysis

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.checkExceptionListWithTwoStems = checkExceptionListWithTwoStems;
exports.checkIfWordEndingIsOnExceptionList = checkIfWordEndingIsOnExceptionList;
exports.checkIfWordIsOnListThatCanHavePrefix = checkIfWordIsOnListThatCanHavePrefix;
var _flattenSortLength = _interopRequireDefault(require("./flattenSortLength"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
/**
 * Checks whether the word ends in one of the words in an exception list that is a simple array.
 *
 * @param {string}	    word            The word to check.
 * @param {string[]}	exceptionList	The list of exceptions.
 *
 * @returns {boolean}	Whether the checked word ends in one of the words in the exception list.
 */
function checkIfWordEndingIsOnExceptionList(word, exceptionList) {
  for (let i = 0; i < exceptionList.length; i++) {
    if (word.endsWith(exceptionList[i])) {
      return true;
    }
  }
  return false;
}

/**
 * Checks whether a word is on the list of words that can have a prefix or not. Before checking the list, checks whether the word has a prefix
 * and if it does, removes it.
 *
 * @param {string}	 	word					The word to check.
 * @param {string[]}	exceptionList			The list of exceptions.
 * @param {Object}		prefixesObject	        An Object that contains the arrays of prefixes.
 *
 * @returns {boolean}	Whether the word was found on the exception list or not.
 */
function checkIfWordIsOnListThatCanHavePrefix(word, exceptionList, prefixesObject) {
  const prefixes = (0, _flattenSortLength.default)(prefixesObject);

  // Check whether the inputted word starts with one of the prefixes
  const foundPrefix = prefixes.find(prefix => word.startsWith(prefix));
  let stemmedWordWithoutPrefix = "";
  if (typeof foundPrefix === "string") {
    stemmedWordWithoutPrefix = word.slice(foundPrefix.length);
    // At least 3 characters left after prefix deletion so that e.g. "be" is not treated as a prefix if found in the word "berg".
    if (stemmedWordWithoutPrefix.length > 2) {
      word = stemmedWordWithoutPrefix;
    }
  }
  return exceptionList.includes(word);
}

/**
 * Checks whether the word ends in one of the words in an exception list with two stems.
 *
 * @param {Array} exceptionListWithTwoStems The exception list with two stems.
 * @param {string} word	The word to check.
 *
 * @returns {string} The stem.
 */
function checkExceptionListWithTwoStems(exceptionListWithTwoStems, word) {
  for (const stemSet of exceptionListWithTwoStems) {
    const foundStem = stemSet.find(stemWord => word.endsWith(stemWord));
    if (foundStem) {
      const precedingLexicalMaterial = word.slice(0, word.length - foundStem.length);
      return precedingLexicalMaterial + stemSet[0];
    }
  }
}
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