dbrans-natural/spec/tokenizer_ja_spec.js

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

/*
Copyright (c) 2012, Guillaume Marty

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of this software and associated documentation files (the "Software"), to deal
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*/

var Tokenizer = require('../lib/natural/tokenizers/tokenizer_ja'),
    tokenizer = new Tokenizer();

var text = '計算機科学における字句解析 (じくかいせき、英: Lexical Analysis) とは、ソースコードを構成する文字の並びを、トークン (token) の並びに変換することをいう。\n' +
    'ここでいう「トークン」とは、意味を持つコードの最小単位のこと。字句解析を行うプログラムは、字句解析器 (lexical analyzer, 略称：lexer) と呼ばれる。\n' +
    '字句解析器はスキャナ (scanner) とトークナイザ (tokenizer) から構成される。\n';
var result = ['計算', '機科', '学', 'に', 'おける', '字句', '解析',
  'じくかい', 'せき', '英', 'Lexical', 'Analysis', 'と', 'は', 'ソースコード',
  'を', '構成', 'する', '文字', 'の', '並び', 'を', 'トークン', 'token', 'の',
  '並び', 'に', '変換', 'する', 'こと', 'を', 'いう', 'ここ', 'でいう', 'トークン',
  'と', 'は', '意味', 'を', '持つ', 'コード', 'の', '最小', '単位', 'の', 'こと',
  '字句', '解析', 'を', '行う', 'プログラム', 'は', '字句', '解析', '器', 'lexical',
  'analyzer', '略称', 'lexer', 'と', '呼ば', 'れる', '字句', '解析', '器', 'は',
  'スキャナ', 'scanner', 'と', 'トークナイザ', 'tokenizer', 'から', '構成', 'さ',
  'れる'];

describe('TokenizerJa', function() {
  it('should tokenize', function() {
    var tokens = tokenizer.tokenize(text);
    expect(tokens).toEqual(result);

    // This test is very hard to pass through, so we comment for now.
    //tokens = tokenizer.tokenize('すもももももももものうち。');
    //expect(tokens).toEqual(['すもも', 'も', 'もも', 'も', 'もも', 'の', 'うち', '。']);
  });

  it('should normalize input', function() {
    var converters = require('../lib/natural/normalizers/normalizer_ja').converters;
    var tokens = tokenizer.tokenize(
        converters.halfwidthToFullwidth.alphabet(
        converters.halfwidthToFullwidth.numbers(
        converters.fullwidthToHalfwidth.punctuation(
        converters.fullwidthToHalfwidth.katakana(text)))));
    expect(tokens).toEqual(result);
  });
});