yoastseo/build/languageProcessing/languages/fa/helpers/createBasicWordForms.js

Yoast client-side content analysis

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = createBasicWordForms;
var _yoastseo = require("yoastseo");
const {
  regexHelpers: {
    searchAndReplaceWithRegex
  }
} = _yoastseo.languageProcessing;

/**
 * Creates the basic affixed-forms of a given Farsi word
 *
 * @param {string} word      The word to check
 *
 * @returns {Array} The created forms
 */
const createForms = function (word) {
  const prefix = "ن";
  // Regular suffixes
  const suffixes1 = ["مان", "شان", "تان", "ش", "ت", "م", "ی"];
  // Suffixes for words that end in ا or و
  const suffixes2 = ["یی", "یم", "یت", "یش"];
  // Suffixes for words that end in silent ه
  const suffixes3 = ["‌ای", "‌یی", "‌ام", "‌ات", "‌اش"];
  // Suffixes for words that end in ها
  const suffixes4 = ["یی", "ی"];
  const createdForms = [];

  // Create prefixed form.
  createdForms.push(prefix + word);

  // Create suffixed forms using suffixes from one of the four groups, depending on the word's ending.
  if (word.endsWith("ها")) {
    createdForms.push(...suffixes4.map(suffix => word + suffix));
  } else if (/([^وای]ه)$/i.test(word)) {
    createdForms.push(...suffixes3.map(suffix => word + suffix));
  } else if (/([وا])$/i.test(word)) {
    createdForms.push(...suffixes2.map(suffix => word + suffix));
  } else {
    if (word.endsWith("ی")) {
      createdForms.push(word + "‌ای");
    }
    createdForms.push(...suffixes1.map(suffix => word + suffix));
  }
  return createdForms;
};

/**
 * Stem the basic affixes of a given Farsi word
 *
 * @param {string} word  The word to check
 *
 * @returns {string} The stemmed word
 */
const stemWord = function (word) {
  const prefix = "ن";
  const suffixesAndReplacements = [["(و|ا)(یش|یت|یم|یی)$", "$1"], ["([^وای]ه)(‌یی|‌ای|‌اش|‌ات|‌ام)$", "$1"], ["(ی)‌ای$", "$1"], ["(ها)یی$", "$1"], ["(مان|شان|تان|ش|ت|م|ی)$", ""]];
  // Remove prefix.
  if (word.startsWith(prefix)) {
    return word.slice(1, word.length);
  }
  // Search for and remove suffixes.
  return searchAndReplaceWithRegex(word, suffixesAndReplacements);
};

/**
 * Creates basic word forms for a given Farsi word.
 *
 * @param {string} word     The word for which to create basic word forms.
 *
 * @returns {Array} Prefixed and de-prefixed variations of a word.
 */
function createBasicWordForms(word) {
  const forms = [];

  /*
   * Add prefixes and suffixes to the input word. We always do this, since some words
   * beginning with an affix-like letter might be exceptions where this is the
   * actual first letter or last letter of the word.
   */

  forms.push(...createForms(word));

  /*
   * If a word starts with a prefix or if it ends with one of the suffixes, we strip it and create all possible
   * affixed forms based on this stem.
   */
  const stemmedWord = stemWord(word);
  if (stemmedWord) {
    forms.push(stemmedWord);
    forms.push(...createForms(stemmedWord));
  }
  return forms;
}
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