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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;
+}