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-/*
- * Copyright (C) 2016-2020 Yomichan Authors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- */
-
-/* global
- * jp
- * wanakana
- */
-
-(() => {
- const HALFWIDTH_KATAKANA_MAPPING = new Map([
- ['ｦ', 'ヲヺ-'],
- ['ｧ', 'ァ--'],
- ['ｨ', 'ィ--'],
- ['ｩ', 'ゥ--'],
- ['ｪ', 'ェ--'],
- ['ｫ', 'ォ--'],
- ['ｬ', 'ャ--'],
- ['ｭ', 'ュ--'],
- ['ｮ', 'ョ--'],
- ['ｯ', 'ッ--'],
- ['ｰ', 'ー--'],
- ['ｱ', 'ア--'],
- ['ｲ', 'イ--'],
- ['ｳ', 'ウヴ-'],
- ['ｴ', 'エ--'],
- ['ｵ', 'オ--'],
- ['ｶ', 'カガ-'],
- ['ｷ', 'キギ-'],
- ['ｸ', 'クグ-'],
- ['ｹ', 'ケゲ-'],
- ['ｺ', 'コゴ-'],
- ['ｻ', 'サザ-'],
- ['ｼ', 'シジ-'],
- ['ｽ', 'スズ-'],
- ['ｾ', 'セゼ-'],
- ['ｿ', 'ソゾ-'],
- ['ﾀ', 'タダ-'],
- ['ﾁ', 'チヂ-'],
- ['ﾂ', 'ツヅ-'],
- ['ﾃ', 'テデ-'],
- ['ﾄ', 'トド-'],
- ['ﾅ', 'ナ--'],
- ['ﾆ', 'ニ--'],
- ['ﾇ', 'ヌ--'],
- ['ﾈ', 'ネ--'],
- ['ﾉ', 'ノ--'],
- ['ﾊ', 'ハバパ'],
- ['ﾋ', 'ヒビピ'],
- ['ﾌ', 'フブプ'],
- ['ﾍ', 'ヘベペ'],
- ['ﾎ', 'ホボポ'],
- ['ﾏ', 'マ--'],
- ['ﾐ', 'ミ--'],
- ['ﾑ', 'ム--'],
- ['ﾒ', 'メ--'],
- ['ﾓ', 'モ--'],
- ['ﾔ', 'ヤ--'],
- ['ﾕ', 'ユ--'],
- ['ﾖ', 'ヨ--'],
- ['ﾗ', 'ラ--'],
- ['ﾘ', 'リ--'],
- ['ﾙ', 'ル--'],
- ['ﾚ', 'レ--'],
- ['ﾛ', 'ロ--'],
- ['ﾜ', 'ワ--'],
- ['ﾝ', 'ン--']
- ]);
-
- const ITERATION_MARK_CODE_POINT = 0x3005;
-
- const HIRAGANA_SMALL_TSU_CODE_POINT = 0x3063;
- const KATAKANA_SMALL_TSU_CODE_POINT = 0x30c3;
- const KANA_PROLONGED_SOUND_MARK_CODE_POINT = 0x30fc;
-
- // Existing functions
-
- const isCodePointKanji = jp.isCodePointKanji;
- const isStringEntirelyKana = jp.isStringEntirelyKana;
-
-
- // Conversion functions
-
- function convertKatakanaToHiragana(text) {
- let result = '';
- for (const c of text) {
- if (wanakana.isKatakana(c)) {
- result += wanakana.toHiragana(c);
- } else {
- result += c;
- }
- }
-
- return result;
- }
-
- function convertHiraganaToKatakana(text) {
- let result = '';
- for (const c of text) {
- if (wanakana.isHiragana(c)) {
- result += wanakana.toKatakana(c);
- } else {
- result += c;
- }
- }
-
- return result;
- }
-
- function convertToRomaji(text) {
- return wanakana.toRomaji(text);
- }
-
- function convertReading(expression, reading, readingMode) {
- switch (readingMode) {
- case 'hiragana':
- return convertKatakanaToHiragana(reading);
- case 'katakana':
- return convertHiraganaToKatakana(reading);
- case 'romaji':
- if (reading) {
- return convertToRomaji(reading);
- } else {
- if (isStringEntirelyKana(expression)) {
- return convertToRomaji(expression);
- }
- }
- return reading;
- case 'none':
- return '';
- default:
- return reading;
- }
- }
-
- function convertNumericToFullWidth(text) {
- let result = '';
- for (const char of text) {
- let c = char.codePointAt(0);
- if (c >= 0x30 && c <= 0x39) { // ['0', '9']
- c += 0xff10 - 0x30; // 0xff10 = '0' full width
- result += String.fromCodePoint(c);
- } else {
- result += char;
- }
- }
- return result;
- }
-
- function convertHalfWidthKanaToFullWidth(text, sourceMap=null) {
- let result = '';
-
- // This function is safe to use charCodeAt instead of codePointAt, since all
- // the relevant characters are represented with a single UTF-16 character code.
- for (let i = 0, ii = text.length; i < ii; ++i) {
- const c = text[i];
- const mapping = HALFWIDTH_KATAKANA_MAPPING.get(c);
- if (typeof mapping !== 'string') {
- result += c;
- continue;
- }
-
- let index = 0;
- switch (text.charCodeAt(i + 1)) {
- case 0xff9e: // dakuten
- index = 1;
- break;
- case 0xff9f: // handakuten
- index = 2;
- break;
- }
-
- let c2 = mapping[index];
- if (index > 0) {
- if (c2 === '-') { // invalid
- index = 0;
- c2 = mapping[0];
- } else {
- ++i;
- }
- }
-
- if (sourceMap !== null && index > 0) {
- sourceMap.combine(result.length, 1);
- }
- result += c2;
- }
-
- return result;
- }
-
- function convertAlphabeticToKana(text, sourceMap=null) {
- let part = '';
- let result = '';
-
- for (const char of text) {
- // Note: 0x61 is the character code for 'a'
- let c = char.codePointAt(0);
- if (c >= 0x41 && c <= 0x5a) { // ['A', 'Z']
- c += (0x61 - 0x41);
- } else if (c >= 0x61 && c <= 0x7a) { // ['a', 'z']
- // NOP; c += (0x61 - 0x61);
- } else if (c >= 0xff21 && c <= 0xff3a) { // ['A', 'Z'] fullwidth
- c += (0x61 - 0xff21);
- } else if (c >= 0xff41 && c <= 0xff5a) { // ['a', 'z'] fullwidth
- c += (0x61 - 0xff41);
- } else if (c === 0x2d || c === 0xff0d) { // '-' or fullwidth dash
- c = 0x2d; // '-'
- } else {
- if (part.length > 0) {
- result += convertAlphabeticPartToKana(part, sourceMap, result.length);
- part = '';
- }
- result += char;
- continue;
- }
- part += String.fromCodePoint(c);
- }
-
- if (part.length > 0) {
- result += convertAlphabeticPartToKana(part, sourceMap, result.length);
- }
- return result;
- }
-
- function convertAlphabeticPartToKana(text, sourceMap, sourceMapStart) {
- const result = wanakana.toHiragana(text);
-
- // Generate source mapping
- if (sourceMap !== null) {
- let i = 0;
- let resultPos = 0;
- const ii = text.length;
- while (i < ii) {
- // Find smallest matching substring
- let iNext = i + 1;
- let resultPosNext = result.length;
- while (iNext < ii) {
- const t = wanakana.toHiragana(text.substring(0, iNext));
- if (t === result.substring(0, t.length)) {
- resultPosNext = t.length;
- break;
- }
- ++iNext;
- }
-
- // Merge characters
- const removals = iNext - i - 1;
- if (removals > 0) {
- sourceMap.combine(sourceMapStart, removals);
- }
- ++sourceMapStart;
-
- // Empty elements
- const additions = resultPosNext - resultPos - 1;
- for (let j = 0; j < additions; ++j) {
- sourceMap.insert(sourceMapStart, 0);
- ++sourceMapStart;
- }
-
- i = iNext;
- resultPos = resultPosNext;
- }
- }
-
- return result;
- }
-
-
- // Furigana distribution
-
- function distributeFurigana(expression, reading) {
- const fallback = [{furigana: reading, text: expression}];
- if (!reading) {
- return fallback;
- }
-
- let isAmbiguous = false;
- const segmentize = (reading2, groups) => {
- if (groups.length === 0 || isAmbiguous) {
- return [];
- }
-
- const group = groups[0];
- if (group.mode === 'kana') {
- if (convertKatakanaToHiragana(reading2).startsWith(convertKatakanaToHiragana(group.text))) {
- const readingLeft = reading2.substring(group.text.length);
- const segs = segmentize(readingLeft, groups.splice(1));
- if (segs) {
- return [{text: group.text, furigana: ''}].concat(segs);
- }
- }
- } else {
- let foundSegments = null;
- for (let i = reading2.length; i >= group.text.length; --i) {
- const readingUsed = reading2.substring(0, i);
- const readingLeft = reading2.substring(i);
- const segs = segmentize(readingLeft, groups.slice(1));
- if (segs) {
- if (foundSegments !== null) {
- // more than one way to segmentize the tail, mark as ambiguous
- isAmbiguous = true;
- return null;
- }
- foundSegments = [{text: group.text, furigana: readingUsed}].concat(segs);
- }
- // there is only one way to segmentize the last non-kana group
- if (groups.length === 1) {
- break;
- }
- }
- return foundSegments;
- }
- };
-
- const groups = [];
- let modePrev = null;
- for (const c of expression) {
- const codePoint = c.codePointAt(0);
- const modeCurr = isCodePointKanji(codePoint) || codePoint === ITERATION_MARK_CODE_POINT ? 'kanji' : 'kana';
- if (modeCurr === modePrev) {
- groups[groups.length - 1].text += c;
- } else {
- groups.push({mode: modeCurr, text: c});
- modePrev = modeCurr;
- }
- }
-
- const segments = segmentize(reading, groups);
- if (segments && !isAmbiguous) {
- return segments;
- }
- return fallback;
- }
-
- function distributeFuriganaInflected(expression, reading, source) {
- const output = [];
-
- let stemLength = 0;
- const shortest = Math.min(source.length, expression.length);
- const sourceHiragana = convertKatakanaToHiragana(source);
- const expressionHiragana = convertKatakanaToHiragana(expression);
- while (stemLength < shortest && sourceHiragana[stemLength] === expressionHiragana[stemLength]) {
- ++stemLength;
- }
- const offset = source.length - stemLength;
-
- const stemExpression = source.substring(0, source.length - offset);
- const stemReading = reading.substring(
- 0,
- offset === 0 ? reading.length : reading.length - expression.length + stemLength
- );
- for (const segment of distributeFurigana(stemExpression, stemReading)) {
- output.push(segment);
- }
-
- if (stemLength !== source.length) {
- output.push({text: source.substring(stemLength), furigana: ''});
- }
-
- return output;
- }
-
-
- // Miscellaneous
-
- function collapseEmphaticSequences(text, fullCollapse, sourceMap=null) {
- let result = '';
- let collapseCodePoint = -1;
- const hasSourceMap = (sourceMap !== null);
- for (const char of text) {
- const c = char.codePointAt(0);
- if (
- c === HIRAGANA_SMALL_TSU_CODE_POINT ||
- c === KATAKANA_SMALL_TSU_CODE_POINT ||
- c === KANA_PROLONGED_SOUND_MARK_CODE_POINT
- ) {
- if (collapseCodePoint !== c) {
- collapseCodePoint = c;
- if (!fullCollapse) {
- result += char;
- continue;
- }
- }
- } else {
- collapseCodePoint = -1;
- result += char;
- continue;
- }
-
- if (hasSourceMap) {
- sourceMap.combine(Math.max(0, result.length - 1), 1);
- }
- }
- return result;
- }
-
-
- // Exports
-
- Object.assign(jp, {
- convertKatakanaToHiragana,
- convertHiraganaToKatakana,
- convertToRomaji,
- convertReading,
- convertNumericToFullWidth,
- convertHalfWidthKanaToFullWidth,
- convertAlphabeticToKana,
- distributeFurigana,
- distributeFuriganaInflected,
- collapseEmphaticSequences
- });
-})();