@mrizki/natural/lib/natural/inflectors/ja/noun_inflector.js

General natural language (tokenizing, stemming (English, Russian, Spanish), part-of-speech tagging, sentiment analysis, classification, inflection, phonetics, tfidf, WordNet, jaro-winkler, Levenshtein distance, Dice's Coefficient) facilities for node.

/*
 Copyright (c) 2012, Guillaume Marty

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */

/**
 * A noun inflector for Japanese.
 * Compiled from several sources including:
 * \@see http://answers.yahoo.com/question/index?qid=20080528201740AASBWy6
 * \@see http://www.excite.co.jp/dictionary/english_japanese/
 *
 * This script assumes input is normalized using normalizer_ja().
 * Pluralizing Japanese has a very limited interest.
 * Japanese don't usually distinct plural from singular, so even a word looking
 * like a singular might actually be a plural.
 *
 * Singularization of nouns ending by -tachi or -ra is achieved using a
 * comprehensive black list, while nouns ending by -domo or -gata use a white
 * list because there are too many exceptions.
 *
 * \@todo Singularize nouns ending by -ら, but there are too many exceptions.
 * \@todo Expand the list of common plurals ending by -domo and -gata.
 */

var SingularPluralInflector = require('../singular_plural_inflector'),
    util = require('util'),
    FormSet = require('../form_set');

function attach() {
  var inflector = this;

  String.prototype.singularizeNoun = function() {
    return inflector.singularize(this);
  };

  String.prototype.pluralizeNoun = function() {
    return inflector.pluralize(this);
  };
}



/**
 * @constructor
 */
var NounInflector = function() {
  // Ambiguous a.k.a. invariant.
  this.ambiguous = [
    'ともだち', '友だち', '友達', '遊び友達', '飲み友達', '酒飲み友達', '茶飲み友達',
    '学校友達', '女友達', '男友達', '幼友達'
  ];

  this.customPluralForms = [];
  this.customSingularForms = [];
  this.singularForms = new FormSet();
  this.pluralForms = new FormSet();

  this.attach = attach;

  this.addIrregular('神', '神神');
  this.addIrregular('人', '人人');
  this.addIrregular('年', '年年');
  this.addIrregular('月', '月月');
  this.addIrregular('日', '日日');
  this.addIrregular('星', '星星');
  this.addIrregular('島', '島島');
  this.addIrregular('我', '我我');
  this.addIrregular('山', '山山');
  this.addIrregular('国', '国国');
  this.addIrregular('所', '所所');
  this.addIrregular('隅', '隅隅');

  /**
   * Notes:
   * -たち exceptions: いたち, おいたち, ついたち, かたち, かおかたち, なりかたち, いでたち, はたち, からたち, なりたち
   * -達 exceptions: 伊達, 男伊達, 栄達, 上意下達, 熟達, 上達, 下意上達, 先達, 送達, 速達, 即日速達, 書留速達, 調達, 通達, 伝達, 到達, 配達, 牛乳配達, 新聞配達, 無料配達, 四通八達, 発達, 未発達, 御用達, 宮内庁御用達, 練達, 闊達
   * -等 exceptions: 一等, 下等, 何等, 均等, 勲等, 高等, 三等, 初等, 上等, 親等, 二親等, 数等, 対等, 中等, 同等, 特等, 二等, 品等, 不等, 平等, 悪平等, 男女平等, 不平等, 優等, 劣等
   */

  // Pluralize
  this.pluralForms.regularForms.push([/^(.+)$/i, '$1たち']);

  // Singularize
  this.singularForms.regularForms.push([/^(.+)たち$/i, function(a, mask) {
    if (['い', 'おい', 'つい', 'か', 'かおか', 'なりか', 'いで', 'は', 'から',
      'なり'].indexOf(mask) >= 0)
      return mask + 'たち';
    return mask;
  }]);
  this.singularForms.regularForms.push([/^(.+)達$/i, function(a, mask) {
    if (['伊', '伊', '栄', '上意下', '熟', '上', '下意上', '先', '送', '速',
      '即日速', '書留速', '調', '通', '伝', '到', '配', '牛乳配', '新聞配', '無料配',
      '四通八', '発', '未発', '御用', '宮内庁御用', '練', '闊'].indexOf(mask) >= 0)
      return mask + '達';
    return mask;
  }]);  // Singularize nouns ending by -等, but not exceptions.
  this.singularForms.regularForms.push([/^(.+)等$/i, function(a, mask) {
    if (['一', '下', '何', '均', '勲', '高', '三', '初', '親', '二親', '数', '対',
      '中', '同', '特', '二', '品', '不', '平', '悪平', '男女平', '不平', '優',
      '劣'].indexOf(mask) >= 0)
      return mask + '等';
    return mask;
  }]);
  this.singularForms.regularForms.push([/^(人間|わたくし|私|てまえ|手前|野郎|やろう|勇者|がき|ガキ|餓鬼|あくとう|悪党|猫|家来)(共|ども)$/i, '$1']);
  this.singularForms.regularForms.push([/^(神様|先生|あなた|大名|女中|奥様)(方|がた)$/i, '$1']);

  this.pluralize = function(token) {
    return this.ize(token, this.pluralForms, this.customPluralForms);
  };

  this.singularize = function(token) {
    return this.ize(token, this.singularForms, this.customSingularForms);
  };
};

util.inherits(NounInflector, SingularPluralInflector);

module.exports = NounInflector;