yomichan/ext/bg/js/database.js

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/*
* Copyright (C) 2016 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 <http://www.gnu.org/licenses/>.
*/
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class Database {
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constructor() {
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this.db = null;
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this.tagMetaCache = {};
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}
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prepare() {
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if (this.db !== null) {
return Promise.reject('database already initialized');
}
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this.db = new Dexie('dict');
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this.db.version(1).stores({
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terms: '++id,dictionary,expression,reading',
kanji: '++,dictionary,character',
tagMeta: '++,dictionary',
dictionaries: '++,title,version',
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});
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return this.db.open();
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}
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purge() {
if (this.db === null) {
return Promise.reject('database not initialized');
}
this.db.close();
return this.db.delete().then(() => {
this.db = null;
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this.tagMetaCache = {};
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return this.prepare();
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});
}
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findTerm(term, dictionaries) {
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if (this.db === null) {
return Promise.reject('database not initialized');
}
const results = [];
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return this.db.terms.where('expression').equals(term).or('reading').equals(term).each(row => {
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if (dictionaries.includes(row.dictionary)) {
results.push({
expression: row.expression,
reading: row.reading,
tags: splitField(row.tags),
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rules: splitField(row.rules),
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glossary: row.glossary,
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score: row.score,
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dictionary: row.dictionary,
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id: row.id
});
}
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}).then(() => {
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return this.cacheTagMeta(dictionaries);
}).then(() => {
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for (const result of results) {
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result.tagMeta = this.tagMetaCache[result.dictionary] || {};
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}
return results;
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});
}
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findKanji(kanji, dictionaries) {
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if (this.db === null) {
return Promise.reject('database not initialized');
}
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const results = [];
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return this.db.kanji.where('character').equals(kanji).each(row => {
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if (dictionaries.includes(row.dictionary)) {
results.push({
character: row.character,
onyomi: splitField(row.onyomi),
kunyomi: splitField(row.kunyomi),
tags: splitField(row.tags),
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glossary: row.meanings,
dictionary: row.dictionary
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});
}
}).then(() => {
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return this.cacheTagMeta(dictionaries);
}).then(() => {
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for (const result of results) {
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result.tagMeta = this.tagMetaCache[result.dictionary] || {};
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}
return results;
});
}
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cacheTagMeta(dictionaries) {
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if (this.db === null) {
return Promise.reject('database not initialized');
}
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const promises = [];
for (const dictionary of dictionaries) {
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if (this.tagMetaCache[dictionary]) {
continue;
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}
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const tagMeta = {};
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promises.push(
this.db.tagMeta.where('dictionary').equals(dictionary).each(row => {
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tagMeta[row.name] = {category: row.category, notes: row.notes, order: row.order};
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}).then(() => {
this.tagMetaCache[dictionary] = tagMeta;
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})
);
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}
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return Promise.all(promises);
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}
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getDictionaries() {
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if (this.db === null) {
return Promise.reject('database not initialized');
}
return this.db.dictionaries.toArray();
}
deleteDictionary(title, callback) {
if (this.db === null) {
return Promise.reject('database not initialized');
}
return this.db.dictionaries.where('title').equals(title).first(info => {
if (!info) {
return;
}
let termCounter = Promise.resolve(0);
if (info.hasTerms) {
termCounter = this.db.terms.where('dictionary').equals(title).count();
}
let kanjiCounter = Promise.resolve(0);
if (info.hasKanji) {
kanjiCounter = this.db.kanji.where('dictionary').equals(title).count();
}
return Promise.all([termCounter, kanjiCounter]).then(([termCount, kanjiCount]) => {
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const rowLimit = 500;
const totalCount = termCount + kanjiCount;
let deletedCount = 0;
let termDeleter = Promise.resolve();
if (info.hasTerms) {
const termDeleterFunc = () => {
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return this.db.terms.where('dictionary').equals(title).limit(rowLimit).delete().then(count => {
if (count === 0) {
return Promise.resolve();
}
deletedCount += count;
if (callback) {
callback(totalCount, deletedCount);
}
return termDeleterFunc();
});
};
termDeleter = termDeleterFunc();
}
let kanjiDeleter = Promise.resolve();
if (info.hasKanji) {
const kanjiDeleterFunc = () => {
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return this.db.kanji.where('dictionary').equals(title).limit(rowLimit).delete().then(count => {
if (count === 0) {
return Promise.resolve();
}
deletedCount += count;
if (callback) {
callback(totalCount, deletedCount);
}
return kanjiDeleterFunc();
});
};
kanjiDeleter = kanjiDeleterFunc();
}
return Promise.all([termDeleter, kanjiDeleter]);
});
}).then(() => {
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return this.db.tagMeta.where('dictionary').equals(title).delete();
}).then(() => {
return this.db.dictionaries.where('title').equals(title).delete();
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}).then(() => {
delete this.cacheTagMeta[title];
});
}
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importDictionary(indexUrl, callback) {
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if (this.db === null) {
return Promise.reject('database not initialized');
}
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let summary = null;
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const indexLoaded = (title, version, revision, tagMeta, hasTerms, hasKanji) => {
summary = {title, version, revision, hasTerms, hasKanji};
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return this.db.dictionaries.where('title').equals(title).count().then(count => {
if (count > 0) {
return Promise.reject(`dictionary "${title}" is already imported`);
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}
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return this.db.dictionaries.add({title, version, revision, hasTerms, hasKanji}).then(() => {
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const rows = [];
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for (const tag in tagMeta || {}) {
const meta = tagMeta[tag];
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const row = sanitizeTag({
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name: tag,
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category: meta.category,
notes: meta.notes,
order: meta.order,
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dictionary: title
});
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rows.push(row);
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}
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return this.db.tagMeta.bulkAdd(rows);
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});
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});
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};
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const termsLoaded = (title, entries, total, current) => {
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const rows = [];
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for (const [expression, reading, tags, rules, score, ...glossary] of entries) {
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rows.push({
expression,
reading,
tags,
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rules,
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score,
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glossary,
dictionary: title
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});
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}
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return this.db.terms.bulkAdd(rows).then(() => {
if (callback) {
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callback(total, current, indexUrl);
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}
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});
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};
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const kanjiLoaded = (title, entries, total, current) => {
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const rows = [];
for (const [character, onyomi, kunyomi, tags, ...meanings] of entries) {
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rows.push({
character,
onyomi,
kunyomi,
tags,
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meanings,
dictionary: title
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});
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}
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return this.db.kanji.bulkAdd(rows).then(() => {
if (callback) {
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callback(total, current, indexUrl);
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}
});
};
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return importJsonDb(indexUrl, indexLoaded, termsLoaded, kanjiLoaded).then(() => summary);
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}
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}