/* * 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; // 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(expressionFragment, readingFragment, readingMode) { switch (readingMode) { case 'hiragana': return convertKatakanaToHiragana(readingFragment || ''); case 'katakana': return convertHiraganaToKatakana(readingFragment || ''); case 'romaji': if (readingFragment) { return convertToRomaji(readingFragment); } else { if (isStringEntirelyKana(expressionFragment)) { return convertToRomaji(expressionFragment); } } return readingFragment; case 'none': return null; default: return readingFragment; } } 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}].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)}); } return output; } // Exports Object.assign(jp, { convertKatakanaToHiragana, convertHiraganaToKatakana, convertToRomaji, convertReading, convertNumericToFullWidth, convertHalfWidthKanaToFullWidth, convertAlphabeticToKana, distributeFurigana, distributeFuriganaInflected }); })();