459 lines
13 KiB
JavaScript
459 lines
13 KiB
JavaScript
/*
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* Copyright (C) 2016-2020 Alex Yatskov <alex@foosoft.net>
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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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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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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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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/* global
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* wanakana
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*/
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const JP_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 JP_HIRAGANA_RANGE = [0x3040, 0x309f];
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const JP_KATAKANA_RANGE = [0x30a0, 0x30ff];
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const JP_KANA_RANGES = [JP_HIRAGANA_RANGE, JP_KATAKANA_RANGE];
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const JP_CJK_COMMON_RANGE = [0x4e00, 0x9fff];
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const JP_CJK_RARE_RANGE = [0x3400, 0x4dbf];
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const JP_CJK_RANGES = [JP_CJK_COMMON_RANGE, JP_CJK_RARE_RANGE];
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const JP_ITERATION_MARK_CHAR_CODE = 0x3005;
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// Japanese character ranges, roughly ordered in order of expected frequency
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const JP_JAPANESE_RANGES = [
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JP_HIRAGANA_RANGE,
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JP_KATAKANA_RANGE,
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JP_CJK_COMMON_RANGE,
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JP_CJK_RARE_RANGE,
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[0xff66, 0xff9f], // Halfwidth katakana
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[0x30fb, 0x30fc], // Katakana punctuation
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[0xff61, 0xff65], // Kana punctuation
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[0x3000, 0x303f], // CJK punctuation
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[0xff10, 0xff19], // Fullwidth numbers
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[0xff21, 0xff3a], // Fullwidth upper case Latin letters
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[0xff41, 0xff5a], // Fullwidth lower case Latin letters
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[0xff01, 0xff0f], // Fullwidth punctuation 1
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[0xff1a, 0xff1f], // Fullwidth punctuation 2
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[0xff3b, 0xff3f], // Fullwidth punctuation 3
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[0xff5b, 0xff60], // Fullwidth punctuation 4
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[0xffe0, 0xffee] // Currency markers
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];
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// Helper functions
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function _jpIsCodePointInRanges(codePoint, ranges) {
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for (const [min, max] of ranges) {
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if (codePoint >= min && codePoint <= max) {
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return true;
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}
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}
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return false;
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}
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// Character code testing functions
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function jpIsCodePointKanji(codePoint) {
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return _jpIsCodePointInRanges(codePoint, JP_CJK_RANGES);
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}
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function jpIsCodePointKana(codePoint) {
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return _jpIsCodePointInRanges(codePoint, JP_KANA_RANGES);
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}
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function jpIsCodePointJapanese(codePoint) {
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return _jpIsCodePointInRanges(codePoint, JP_JAPANESE_RANGES);
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}
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// String testing functions
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function jpIsStringEntirelyKana(str) {
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if (str.length === 0) { return false; }
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for (const c of str) {
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if (!jpIsCodePointKana(c.codePointAt(0))) {
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return false;
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}
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}
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return true;
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}
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function jpIsStringPartiallyJapanese(str) {
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if (str.length === 0) { return false; }
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for (const c of str) {
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if (jpIsCodePointJapanese(c.codePointAt(0))) {
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return true;
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}
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}
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return false;
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}
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// Conversion functions
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function jpKatakanaToHiragana(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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}
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return result;
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}
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function jpHiraganaToKatakana(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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} else {
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result += c;
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}
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}
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return result;
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}
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function jpToRomaji(text) {
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return wanakana.toRomaji(text);
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}
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function jpConvertReading(expressionFragment, readingFragment, readingMode) {
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switch (readingMode) {
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case 'hiragana':
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return jpKatakanaToHiragana(readingFragment || '');
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case 'katakana':
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return jpHiraganaToKatakana(readingFragment || '');
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case 'romaji':
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if (readingFragment) {
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return jpToRomaji(readingFragment);
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} else {
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if (jpIsStringEntirelyKana(expressionFragment)) {
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return jpToRomaji(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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}
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}
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function jpDistributeFurigana(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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}
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const group = groups[0];
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if (group.mode === 'kana') {
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if (jpKatakanaToHiragana(reading2).startsWith(jpKatakanaToHiragana(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 = jpIsCodePointKanji(codePoint) || codePoint === JP_ITERATION_MARK_CHAR_CODE ? '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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}
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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 jpDistributeFuriganaInflected(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 = jpKatakanaToHiragana(source);
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const expressionHiragana = jpKatakanaToHiragana(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 jpDistributeFurigana(stemExpression, stemReading)) {
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output.push(segment);
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}
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if (stemLength !== source.length) {
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output.push({text: source.substring(stemLength)});
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}
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return output;
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}
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function jpConvertHalfWidthKanaToFullWidth(text, sourceMapping) {
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let result = '';
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const hasSourceMapping = Array.isArray(sourceMapping);
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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 = JP_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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break;
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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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}
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}
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if (hasSourceMapping && index > 0) {
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index = result.length;
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const v = sourceMapping.splice(index + 1, 1)[0];
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sourceMapping[index] += v;
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}
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result += c2;
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}
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return result;
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}
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function jpConvertNumericTofullWidth(text) {
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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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}
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}
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return result;
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}
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function jpConvertAlphabeticToKana(text, sourceMapping) {
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let part = '';
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let result = '';
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const ii = text.length;
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if (sourceMapping.length === ii) {
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sourceMapping.length = ii;
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sourceMapping.fill(1);
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}
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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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} else {
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if (part.length > 0) {
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result += jpToHiragana(part, sourceMapping, result.length);
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part = '';
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}
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result += char;
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continue;
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}
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part += String.fromCodePoint(c);
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}
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if (part.length > 0) {
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result += jpToHiragana(part, sourceMapping, result.length);
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}
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return result;
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}
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function jpToHiragana(text, sourceMapping, sourceMappingStart) {
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const result = wanakana.toHiragana(text);
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// Generate source mapping
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if (Array.isArray(sourceMapping)) {
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if (typeof sourceMappingStart !== 'number') { sourceMappingStart = 0; }
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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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// Merge characters
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const removals = iNext - i - 1;
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if (removals > 0) {
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let sum = 0;
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const vs = sourceMapping.splice(sourceMappingStart + 1, removals);
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for (const v of vs) { sum += v; }
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sourceMapping[sourceMappingStart] += sum;
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}
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++sourceMappingStart;
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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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sourceMapping.splice(sourceMappingStart, 0, 0);
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++sourceMappingStart;
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}
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i = iNext;
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resultPos = resultPosNext;
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}
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}
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return result;
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}
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