119 lines
3.9 KiB
JavaScript
119 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 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 distributeFurigana(word, reading) {
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reading = reading || wanakana.toHiragana(word);
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function span(str, pred) {
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let i = 0;
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while (i < str.length && pred(str[i])) {
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i++;
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}
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return [str.substring(0, i), str.substring(i)];
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}
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const isKanji = c => jpIsKanji(c) ||
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c == "\u3005"; /* kurikaeshi */
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const isKana = c => jpIsKana(c) ||
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c == "\u30fc"; /* chouonpu */
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function parse(word) {
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const res = [];
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while (word.length > 0) {
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const c = word.charAt(0);
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if (isKana(c)) {
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const [text, rest] = span(word, isKana);
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res.push({ type: "kana", text });
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word = rest;
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} else if (isKanji(c)) {
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const [text, rest] = span(word, isKanji);
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res.push({ type: "kanji", text });
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word = rest;
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} else return null;
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}
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return res;
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}
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let fallback = () => [{ text: word, furigana: reading }];
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let parts = parse(word);
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if (parts == null) return fallback();
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let parti = 0;
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let readingi = 0;
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let res = [];
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let current = null;
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function backtrack() {
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parti--;
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const prev = res.pop();
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current = prev.furigana;
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}
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while (parti < parts.length) {
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const part = parts[parti];
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switch (part.type) {
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case 'kana':
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if (reading.startsWith(wanakana.toHiragana(part.text), readingi)) {
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if (parti == parts.length - 1 && readingi != reading.length - part.text.length) {
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backtrack();
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} else {
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readingi += part.text.length;
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res.push({ text: part.text });
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parti++;
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}
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} else backtrack();
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break;
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case "kanji":
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current = current || "";
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if (parti == parts.length - 1) {
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// last part, consume all
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current += reading.substring(readingi);
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} else {
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const nextText = parts[parti + 1].text;
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let end = reading.indexOf(nextText, readingi + 1); // consume at least one character
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if (end == -1) {
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return fallback();
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}
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current += reading.substring(readingi, end);
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readingi = end;
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}
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res.push({ text: part.text, furigana: current });
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current = null;
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parti++;
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}
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}
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return res;
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}
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