127 lines
3.9 KiB
JavaScript
127 lines
3.9 KiB
JavaScript
/*
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* Copyright (C) 2016 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 <http://www.gnu.org/licenses/>.
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*/
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function jpIsKanji(c) {
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const code = c.charCodeAt(0);
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return code >= 0x4e00 && code < 0x9fb0 || code >= 0x3400 && code < 0x4dc0;
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}
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function jpIsKana(c) {
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return wanakana.isKana(c);
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}
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function jpIsJapaneseText(text) {
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for (const c of text) {
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if (jpIsKanji(c) || jpIsKana(c)) {
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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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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 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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const segmentize = (reading, groups) => {
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if (groups.length === 0) {
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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(reading).startsWith(jpKatakanaToHiragana(group.text))) {
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const readingLeft = reading.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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for (let i = reading.length; i >= group.text.length; --i) {
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const readingUsed = reading.substring(0, i);
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const readingLeft = reading.substring(i);
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const segs = segmentize(readingLeft, groups.slice(1));
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if (segs) {
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return [{text: group.text, furigana: readingUsed}].concat(segs);
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}
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}
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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 modeCurr = jpIsKanji(c) || c.charCodeAt(0) === 0x3005 /* noma */ ? '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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return segmentize(reading, groups) || 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 (
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stemLength < shortest &&
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// sometimes an expression can use a kanji that's different from the source
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(!jpIsKana(source[stemLength]) || (sourceHiragana[stemLength] === expressionHiragana[stemLength]))
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) {
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++stemLength;
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}
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const offset = source.length - stemLength;
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for (const segment of jpDistributeFurigana(
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source.slice(0, offset === 0 ? source.length : source.length - offset),
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reading.slice(0, offset === 0 ? reading.length : reading.length - expression.length + stemLength)
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)) {
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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.slice(stemLength)});
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}
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return output;
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}
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