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-/*
- * Copyright (C) 2016-2020 Alex Yatskov <alex@foosoft.net>
- * Author: Alex Yatskov <alex@foosoft.net>
- *
- * 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/>.
- */
-
-
-const JP_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 JP_HIRAGANA_RANGE = [0x3040, 0x309f];
-const JP_KATAKANA_RANGE = [0x30a0, 0x30ff];
-const JP_KANA_RANGES = [JP_HIRAGANA_RANGE, JP_KATAKANA_RANGE];
-
-const JP_CJK_COMMON_RANGE = [0x4e00, 0x9fff];
-const JP_CJK_RARE_RANGE = [0x3400, 0x4dbf];
-const JP_CJK_RANGES = [JP_CJK_COMMON_RANGE, JP_CJK_RARE_RANGE];
-
-const JP_ITERATION_MARK_CHAR_CODE = 0x3005;
-
-// Japanese character ranges, roughly ordered in order of expected frequency
-const JP_JAPANESE_RANGES = [
- JP_HIRAGANA_RANGE,
- JP_KATAKANA_RANGE,
-
- JP_CJK_COMMON_RANGE,
- JP_CJK_RARE_RANGE,
-
- [0xff66, 0xff9f], // Halfwidth katakana
-
- [0x30fb, 0x30fc], // Katakana punctuation
- [0xff61, 0xff65], // Kana punctuation
- [0x3000, 0x303f], // CJK punctuation
-
- [0xff10, 0xff19], // Fullwidth numbers
- [0xff21, 0xff3a], // Fullwidth upper case Latin letters
- [0xff41, 0xff5a], // Fullwidth lower case Latin letters
-
- [0xff01, 0xff0f], // Fullwidth punctuation 1
- [0xff1a, 0xff1f], // Fullwidth punctuation 2
- [0xff3b, 0xff3f], // Fullwidth punctuation 3
- [0xff5b, 0xff60], // Fullwidth punctuation 4
- [0xffe0, 0xffee], // Currency markers
-];
-
-
-// Helper functions
-
-function _jpIsCharCodeInRanges(charCode, ranges) {
- for (const [min, max] of ranges) {
- if (charCode >= min && charCode <= max) {
- return true;
- }
- }
- return false;
-}
-
-
-// Character code testing functions
-
-function jpIsCharCodeKanji(charCode) {
- return _jpIsCharCodeInRanges(charCode, JP_CJK_RANGES);
-}
-
-function jpIsCharCodeKana(charCode) {
- return _jpIsCharCodeInRanges(charCode, JP_KANA_RANGES);
-}
-
-function jpIsCharCodeJapanese(charCode) {
- return _jpIsCharCodeInRanges(charCode, JP_JAPANESE_RANGES);
-}
-
-
-// String testing functions
-
-function jpIsStringEntirelyKana(str) {
- if (str.length === 0) { return false; }
- for (let i = 0, ii = str.length; i < ii; ++i) {
- if (!jpIsCharCodeKana(str.charCodeAt(i))) {
- return false;
- }
- }
- return true;
-}
-
-function jpIsStringPartiallyJapanese(str) {
- if (str.length === 0) { return false; }
- for (let i = 0, ii = str.length; i < ii; ++i) {
- if (jpIsCharCodeJapanese(str.charCodeAt(i))) {
- return true;
- }
- }
- return false;
-}
-
-
-// Conversion functions
-
-function jpKatakanaToHiragana(text) {
- let result = '';
- for (const c of text) {
- if (wanakana.isKatakana(c)) {
- result += wanakana.toHiragana(c);
- } else {
- result += c;
- }
- }
-
- return result;
-}
-
-function jpHiraganaToKatakana(text) {
- let result = '';
- for (const c of text) {
- if (wanakana.isHiragana(c)) {
- result += wanakana.toKatakana(c);
- } else {
- result += c;
- }
- }
-
- return result;
-}
-
-function jpToRomaji(text) {
- return wanakana.toRomaji(text);
-}
-
-function jpConvertReading(expressionFragment, readingFragment, readingMode) {
- switch (readingMode) {
- case 'hiragana':
- return jpKatakanaToHiragana(readingFragment || '');
- case 'katakana':
- return jpHiraganaToKatakana(readingFragment || '');
- case 'romaji':
- if (readingFragment) {
- return jpToRomaji(readingFragment);
- } else {
- if (jpIsStringEntirelyKana(expressionFragment)) {
- return jpToRomaji(expressionFragment);
- }
- }
- return readingFragment;
- case 'none':
- return null;
- default:
- return readingFragment;
- }
-}
-
-function jpDistributeFurigana(expression, reading) {
- const fallback = [{furigana: reading, text: expression}];
- if (!reading) {
- return fallback;
- }
-
- let isAmbiguous = false;
- const segmentize = (reading, groups) => {
- if (groups.length === 0 || isAmbiguous) {
- return [];
- }
-
- const group = groups[0];
- if (group.mode === 'kana') {
- if (jpKatakanaToHiragana(reading).startsWith(jpKatakanaToHiragana(group.text))) {
- const readingLeft = reading.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 = reading.length; i >= group.text.length; --i) {
- const readingUsed = reading.substring(0, i);
- const readingLeft = reading.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 charCode = c.charCodeAt(0);
- const modeCurr = jpIsCharCodeKanji(charCode) || charCode === JP_ITERATION_MARK_CHAR_CODE ? '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 jpDistributeFuriganaInflected(expression, reading, source) {
- const output = [];
-
- let stemLength = 0;
- const shortest = Math.min(source.length, expression.length);
- const sourceHiragana = jpKatakanaToHiragana(source);
- const expressionHiragana = jpKatakanaToHiragana(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 jpDistributeFurigana(stemExpression, stemReading)) {
- output.push(segment);
- }
-
- if (stemLength !== source.length) {
- output.push({text: source.substring(stemLength)});
- }
-
- return output;
-}
-
-function jpConvertHalfWidthKanaToFullWidth(text, sourceMapping) {
- let result = '';
- const ii = text.length;
- const hasSourceMapping = Array.isArray(sourceMapping);
-
- for (let i = 0; i < ii; ++i) {
- const c = text[i];
- const mapping = JP_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 (hasSourceMapping && index > 0) {
- index = result.length;
- const v = sourceMapping.splice(index + 1, 1)[0];
- sourceMapping[index] += v;
- }
- result += c2;
- }
-
- return result;
-}
-
-function jpConvertNumericTofullWidth(text) {
- let result = '';
- for (let i = 0, ii = text.length; i < ii; ++i) {
- let c = text.charCodeAt(i);
- if (c >= 0x30 && c <= 0x39) { // ['0', '9']
- c += 0xff10 - 0x30; // 0xff10 = '0' full width
- result += String.fromCharCode(c);
- } else {
- result += text[i];
- }
- }
- return result;
-}
-
-function jpConvertAlphabeticToKana(text, sourceMapping) {
- let part = '';
- let result = '';
- const ii = text.length;
-
- if (sourceMapping.length === ii) {
- sourceMapping.length = ii;
- sourceMapping.fill(1);
- }
-
- for (let i = 0; i < ii; ++i) {
- // Note: 0x61 is the character code for 'a'
- let c = text.charCodeAt(i);
- 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 += jpToHiragana(part, sourceMapping, result.length);
- part = '';
- }
- result += text[i];
- continue;
- }
- part += String.fromCharCode(c);
- }
-
- if (part.length > 0) {
- result += jpToHiragana(part, sourceMapping, result.length);
- }
- return result;
-}
-
-function jpToHiragana(text, sourceMapping, sourceMappingStart) {
- const result = wanakana.toHiragana(text);
-
- // Generate source mapping
- if (Array.isArray(sourceMapping)) {
- if (typeof sourceMappingStart !== 'number') { sourceMappingStart = 0; }
- 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) {
- let sum = 0;
- const vs = sourceMapping.splice(sourceMappingStart + 1, removals);
- for (const v of vs) { sum += v; }
- sourceMapping[sourceMappingStart] += sum;
- }
- ++sourceMappingStart;
-
- // Empty elements
- const additions = resultPosNext - resultPos - 1;
- for (let j = 0; j < additions; ++j) {
- sourceMapping.splice(sourceMappingStart, 0, 0);
- ++sourceMappingStart;
- }
-
- i = iNext;
- resultPos = resultPosNext;
- }
- }
-
- return result;
-}