2017-07-19 06:07:46 +00:00
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/*
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2020-01-01 17:00:00 +00:00
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* Copyright (C) 2016-2020 Alex Yatskov <alex@foosoft.net>
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2017-07-19 06:07:46 +00:00
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2017-08-26 19:21:28 +00:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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2017-07-19 06:07:46 +00:00
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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2020-01-01 17:00:31 +00:00
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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2017-07-19 06:07:46 +00:00
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*/
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2020-03-11 02:30:36 +00:00
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/* global
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2020-03-21 17:18:34 +00:00
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* jp
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2020-03-11 02:30:36 +00:00
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* wanakana
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*/
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2017-07-19 06:07:46 +00:00
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2020-03-21 17:18:34 +00:00
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(() => {
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2020-03-12 00:33:01 +00:00
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const HALFWIDTH_KATAKANA_MAPPING = new Map([
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['ヲ', 'ヲヺ-'],
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['ァ', 'ァ--'],
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['ィ', 'ィ--'],
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['ゥ', 'ゥ--'],
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['ェ', 'ェ--'],
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['ォ', 'ォ--'],
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['ャ', 'ャ--'],
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['ュ', 'ュ--'],
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['ョ', 'ョ--'],
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['ッ', 'ッ--'],
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['ー', 'ー--'],
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['ア', 'ア--'],
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['イ', 'イ--'],
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['ウ', 'ウヴ-'],
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['エ', 'エ--'],
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['オ', 'オ--'],
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['カ', 'カガ-'],
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['キ', 'キギ-'],
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['ク', 'クグ-'],
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['ケ', 'ケゲ-'],
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['コ', 'コゴ-'],
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['サ', 'サザ-'],
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['シ', 'シジ-'],
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['ス', 'スズ-'],
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['セ', 'セゼ-'],
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['ソ', 'ソゾ-'],
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['タ', 'タダ-'],
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['チ', 'チヂ-'],
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['ツ', 'ツヅ-'],
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['テ', 'テデ-'],
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['ト', 'トド-'],
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['ナ', 'ナ--'],
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['ニ', 'ニ--'],
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['ヌ', 'ヌ--'],
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['ネ', 'ネ--'],
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['ノ', 'ノ--'],
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['ハ', 'ハバパ'],
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['ヒ', 'ヒビピ'],
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['フ', 'フブプ'],
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['ヘ', 'ヘベペ'],
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['ホ', 'ホボポ'],
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['マ', 'マ--'],
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['ミ', 'ミ--'],
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['ム', 'ム--'],
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['メ', 'メ--'],
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['モ', 'モ--'],
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['ヤ', 'ヤ--'],
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['ユ', 'ユ--'],
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['ヨ', 'ヨ--'],
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['ラ', 'ラ--'],
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['リ', 'リ--'],
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['ル', 'ル--'],
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['レ', 'レ--'],
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['ロ', 'ロ--'],
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['ワ', 'ワ--'],
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['ン', 'ン--']
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]);
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const ITERATION_MARK_CODE_POINT = 0x3005;
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2020-04-10 15:56:18 +00:00
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const HIRAGANA_SMALL_TSU_CODE_POINT = 0x3063;
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const KATAKANA_SMALL_TSU_CODE_POINT = 0x30c3;
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2020-01-23 02:43:38 +00:00
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2020-03-21 17:18:34 +00:00
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// Existing functions
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2020-01-23 02:43:38 +00:00
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2020-03-21 17:18:34 +00:00
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const isCodePointKanji = jp.isCodePointKanji;
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const isStringEntirelyKana = jp.isStringEntirelyKana;
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2020-01-23 02:43:38 +00:00
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2020-03-12 00:33:01 +00:00
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// Conversion functions
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2020-01-23 02:43:38 +00:00
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2020-03-12 00:33:01 +00:00
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function convertKatakanaToHiragana(text) {
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let result = '';
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for (const c of text) {
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if (wanakana.isKatakana(c)) {
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result += wanakana.toHiragana(c);
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} else {
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result += c;
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}
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2017-08-15 06:10:59 +00:00
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}
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2020-03-12 00:33:01 +00:00
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return result;
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2019-11-13 18:24:11 +00:00
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}
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2020-03-12 00:33:01 +00:00
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function convertHiraganaToKatakana(text) {
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let result = '';
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for (const c of text) {
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if (wanakana.isHiragana(c)) {
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result += wanakana.toKatakana(c);
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2019-11-13 18:24:11 +00:00
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} else {
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2020-03-12 00:33:01 +00:00
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result += c;
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2019-11-13 18:24:11 +00:00
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}
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2020-03-12 00:33:01 +00:00
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}
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return result;
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2019-11-13 18:24:11 +00:00
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}
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2020-03-12 00:33:01 +00:00
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function convertToRomaji(text) {
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return wanakana.toRomaji(text);
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2017-08-24 03:56:52 +00:00
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}
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2017-08-26 18:57:34 +00:00
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2020-03-12 00:33:01 +00:00
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function convertReading(expressionFragment, readingFragment, readingMode) {
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switch (readingMode) {
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case 'hiragana':
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return convertKatakanaToHiragana(readingFragment || '');
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case 'katakana':
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return convertHiraganaToKatakana(readingFragment || '');
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case 'romaji':
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if (readingFragment) {
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return convertToRomaji(readingFragment);
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} else {
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if (isStringEntirelyKana(expressionFragment)) {
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return convertToRomaji(expressionFragment);
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}
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}
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return readingFragment;
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case 'none':
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return null;
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default:
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return readingFragment;
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2017-08-24 03:56:52 +00:00
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}
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2020-03-12 00:33:01 +00:00
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}
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2017-08-24 03:56:52 +00:00
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2020-03-14 20:38:12 +00:00
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function convertNumericToFullWidth(text) {
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2020-03-12 00:33:01 +00:00
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let result = '';
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for (const char of text) {
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let c = char.codePointAt(0);
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if (c >= 0x30 && c <= 0x39) { // ['0', '9']
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c += 0xff10 - 0x30; // 0xff10 = '0' full width
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result += String.fromCodePoint(c);
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} else {
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result += char;
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2017-08-26 18:57:34 +00:00
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}
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2020-03-12 00:33:01 +00:00
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}
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return result;
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}
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2020-03-28 21:51:58 +00:00
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function convertHalfWidthKanaToFullWidth(text, sourceMap=null) {
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2020-03-12 00:33:01 +00:00
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let result = '';
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// This function is safe to use charCodeAt instead of codePointAt, since all
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// the relevant characters are represented with a single UTF-16 character code.
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for (let i = 0, ii = text.length; i < ii; ++i) {
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const c = text[i];
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const mapping = HALFWIDTH_KATAKANA_MAPPING.get(c);
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if (typeof mapping !== 'string') {
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result += c;
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continue;
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}
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let index = 0;
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switch (text.charCodeAt(i + 1)) {
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case 0xff9e: // dakuten
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index = 1;
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break;
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case 0xff9f: // handakuten
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index = 2;
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2019-11-26 23:20:04 +00:00
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break;
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2020-03-12 00:33:01 +00:00
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}
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let c2 = mapping[index];
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if (index > 0) {
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if (c2 === '-') { // invalid
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index = 0;
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c2 = mapping[0];
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} else {
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++i;
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2017-08-24 03:56:52 +00:00
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}
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2017-08-26 18:57:34 +00:00
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}
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2020-03-28 21:51:58 +00:00
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if (sourceMap !== null && index > 0) {
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sourceMap.combine(result.length, 1);
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2020-03-12 00:33:01 +00:00
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}
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result += c2;
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2017-08-24 03:56:52 +00:00
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}
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2019-11-03 03:08:57 +00:00
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2020-03-12 00:33:01 +00:00
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return result;
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2019-11-03 03:08:57 +00:00
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}
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2020-03-28 21:51:58 +00:00
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function convertAlphabeticToKana(text, sourceMap=null) {
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2020-03-12 00:33:01 +00:00
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let part = '';
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let result = '';
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2019-12-22 19:07:30 +00:00
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2020-03-12 00:33:01 +00:00
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for (const char of text) {
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// Note: 0x61 is the character code for 'a'
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let c = char.codePointAt(0);
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if (c >= 0x41 && c <= 0x5a) { // ['A', 'Z']
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c += (0x61 - 0x41);
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} else if (c >= 0x61 && c <= 0x7a) { // ['a', 'z']
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// NOP; c += (0x61 - 0x61);
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} else if (c >= 0xff21 && c <= 0xff3a) { // ['A', 'Z'] fullwidth
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c += (0x61 - 0xff21);
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} else if (c >= 0xff41 && c <= 0xff5a) { // ['a', 'z'] fullwidth
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c += (0x61 - 0xff41);
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} else if (c === 0x2d || c === 0xff0d) { // '-' or fullwidth dash
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c = 0x2d; // '-'
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2019-12-22 19:07:30 +00:00
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} else {
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2020-03-12 00:33:01 +00:00
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if (part.length > 0) {
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2020-03-28 21:51:58 +00:00
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result += convertAlphabeticPartToKana(part, sourceMap, result.length);
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2020-03-12 00:33:01 +00:00
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part = '';
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}
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result += char;
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continue;
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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part += String.fromCodePoint(c);
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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if (part.length > 0) {
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2020-03-28 21:51:58 +00:00
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result += convertAlphabeticPartToKana(part, sourceMap, result.length);
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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return result;
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2019-12-22 19:07:30 +00:00
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}
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2020-03-28 21:51:58 +00:00
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function convertAlphabeticPartToKana(text, sourceMap, sourceMapStart) {
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2020-03-12 00:33:01 +00:00
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const result = wanakana.toHiragana(text);
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// Generate source mapping
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2020-03-28 21:51:58 +00:00
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if (sourceMap !== null) {
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2020-03-12 00:33:01 +00:00
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let i = 0;
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let resultPos = 0;
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const ii = text.length;
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while (i < ii) {
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// Find smallest matching substring
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let iNext = i + 1;
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let resultPosNext = result.length;
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while (iNext < ii) {
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const t = wanakana.toHiragana(text.substring(0, iNext));
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if (t === result.substring(0, t.length)) {
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resultPosNext = t.length;
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break;
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}
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++iNext;
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}
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2019-12-22 19:07:30 +00:00
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2020-03-12 00:33:01 +00:00
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// Merge characters
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const removals = iNext - i - 1;
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if (removals > 0) {
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2020-03-28 21:51:58 +00:00
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sourceMap.combine(sourceMapStart, removals);
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2020-03-12 00:33:01 +00:00
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}
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2020-03-28 21:51:58 +00:00
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++sourceMapStart;
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2019-12-22 19:07:30 +00:00
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2020-03-12 00:33:01 +00:00
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// Empty elements
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const additions = resultPosNext - resultPos - 1;
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for (let j = 0; j < additions; ++j) {
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2020-03-28 21:51:58 +00:00
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sourceMap.insert(sourceMapStart, 0);
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++sourceMapStart;
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2020-03-12 00:33:01 +00:00
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}
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2019-12-22 19:07:30 +00:00
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2020-03-12 00:33:01 +00:00
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i = iNext;
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resultPos = resultPosNext;
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2019-12-22 19:07:30 +00:00
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}
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}
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2020-03-12 00:33:01 +00:00
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return result;
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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// Furigana distribution
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2019-12-22 19:07:30 +00:00
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2020-03-12 00:33:01 +00:00
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function distributeFurigana(expression, reading) {
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const fallback = [{furigana: reading, text: expression}];
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if (!reading) {
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return fallback;
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}
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let isAmbiguous = false;
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const segmentize = (reading2, groups) => {
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if (groups.length === 0 || isAmbiguous) {
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return [];
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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const group = groups[0];
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if (group.mode === 'kana') {
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if (convertKatakanaToHiragana(reading2).startsWith(convertKatakanaToHiragana(group.text))) {
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const readingLeft = reading2.substring(group.text.length);
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const segs = segmentize(readingLeft, groups.splice(1));
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if (segs) {
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return [{text: group.text}].concat(segs);
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}
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}
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} else {
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let foundSegments = null;
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for (let i = reading2.length; i >= group.text.length; --i) {
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const readingUsed = reading2.substring(0, i);
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const readingLeft = reading2.substring(i);
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const segs = segmentize(readingLeft, groups.slice(1));
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if (segs) {
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if (foundSegments !== null) {
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// more than one way to segmentize the tail, mark as ambiguous
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isAmbiguous = true;
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return null;
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}
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foundSegments = [{text: group.text, furigana: readingUsed}].concat(segs);
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}
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// there is only one way to segmentize the last non-kana group
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if (groups.length === 1) {
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break;
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}
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}
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return foundSegments;
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}
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};
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const groups = [];
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let modePrev = null;
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for (const c of expression) {
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const codePoint = c.codePointAt(0);
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const modeCurr = isCodePointKanji(codePoint) || codePoint === ITERATION_MARK_CODE_POINT ? 'kanji' : 'kana';
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if (modeCurr === modePrev) {
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groups[groups.length - 1].text += c;
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} else {
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groups.push({mode: modeCurr, text: c});
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modePrev = modeCurr;
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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}
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const segments = segmentize(reading, groups);
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if (segments && !isAmbiguous) {
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return segments;
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}
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return fallback;
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}
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function distributeFuriganaInflected(expression, reading, source) {
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const output = [];
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let stemLength = 0;
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const shortest = Math.min(source.length, expression.length);
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const sourceHiragana = convertKatakanaToHiragana(source);
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const expressionHiragana = convertKatakanaToHiragana(expression);
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while (stemLength < shortest && sourceHiragana[stemLength] === expressionHiragana[stemLength]) {
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++stemLength;
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}
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const offset = source.length - stemLength;
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const stemExpression = source.substring(0, source.length - offset);
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const stemReading = reading.substring(
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0,
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offset === 0 ? reading.length : reading.length - expression.length + stemLength
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);
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for (const segment of distributeFurigana(stemExpression, stemReading)) {
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output.push(segment);
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}
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2019-12-22 19:07:30 +00:00
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2020-03-12 00:33:01 +00:00
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if (stemLength !== source.length) {
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output.push({text: source.substring(stemLength)});
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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return output;
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2019-12-22 19:07:30 +00:00
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}
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2020-03-12 00:33:01 +00:00
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2020-04-10 15:56:18 +00:00
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// Miscellaneous
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function collapseEmphaticSequences(sourceText, fullCollapse, sourceMap=null) {
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let result = '';
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let collapseCodePoint = -1;
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const hasSourceMap = (sourceMap !== null);
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for (const char of sourceText) {
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const c = char.codePointAt(0);
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if (c === HIRAGANA_SMALL_TSU_CODE_POINT || c === KATAKANA_SMALL_TSU_CODE_POINT) {
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if (collapseCodePoint !== c) {
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collapseCodePoint = c;
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if (!fullCollapse) {
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result += char;
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continue;
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}
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}
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} else {
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collapseCodePoint = -1;
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result += char;
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continue;
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}
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if (hasSourceMap) {
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const index = result.length;
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if (index > 0) {
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sourceMap.combine(index - 1, 1);
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}
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}
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}
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return result;
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}
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2020-03-12 00:33:01 +00:00
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// Exports
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2020-03-21 17:18:34 +00:00
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Object.assign(jp, {
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2020-03-12 00:33:01 +00:00
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convertKatakanaToHiragana,
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convertHiraganaToKatakana,
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convertToRomaji,
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convertReading,
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2020-03-14 20:38:12 +00:00
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convertNumericToFullWidth,
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2020-03-12 00:33:01 +00:00
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convertHalfWidthKanaToFullWidth,
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convertAlphabeticToKana,
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distributeFurigana,
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2020-04-10 15:56:18 +00:00
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distributeFuriganaInflected,
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collapseEmphaticSequences
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2020-03-21 17:18:34 +00:00
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});
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2020-03-12 00:33:01 +00:00
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})();
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