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/*
* Copyright (C) 2023-2024 Yomitan Authors
* Copyright (C) 2016-2022 Yomichan Authors
*
* 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/>.
*/
import {ClipboardReader} from '../comm/clipboard-reader.js';
import {createApiMap, invokeApiMapHandler} from '../core/api-map.js';
import {arrayBufferToBase64} from '../data/sandbox/array-buffer-util.js';
import {DictionaryDatabase} from '../dictionary/dictionary-database.js';
import {Translator} from '../language/translator.js';
/**
* This class controls the core logic of the extension, including API calls
* and various forms of communication between browser tabs and external applications.
*/
export class Offscreen {
/**
* Creates a new instance.
*/
constructor() {
/** @type {DictionaryDatabase} */
this._dictionaryDatabase = new DictionaryDatabase();
/** @type {Translator} */
this._translator = new Translator({
database: this._dictionaryDatabase
});
/** @type {ClipboardReader} */
this._clipboardReader = new ClipboardReader({
document: (typeof document === 'object' && document !== null ? document : null),
pasteTargetSelector: '#clipboard-paste-target',
richContentPasteTargetSelector: '#clipboard-rich-content-paste-target'
});
/* eslint-disable @stylistic/no-multi-spaces */
/** @type {import('offscreen').ApiMap} */
this._apiMap = createApiMap([
['clipboardGetTextOffscreen', this._getTextHandler.bind(this)],
['clipboardGetImageOffscreen', this._getImageHandler.bind(this)],
['clipboardSetBrowserOffscreen', this._setClipboardBrowser.bind(this)],
['databasePrepareOffscreen', this._prepareDatabaseHandler.bind(this)],
['getDictionaryInfoOffscreen', this._getDictionaryInfoHandler.bind(this)],
['databasePurgeOffscreen', this._purgeDatabaseHandler.bind(this)],
['databaseGetMediaOffscreen', this._getMediaHandler.bind(this)],
['translatorPrepareOffscreen', this._prepareTranslatorHandler.bind(this)],
['findKanjiOffscreen', this._findKanjiHandler.bind(this)],
['findTermsOffscreen', this._findTermsHandler.bind(this)],
['getTermFrequenciesOffscreen', this._getTermFrequenciesHandler.bind(this)],
['clearDatabaseCachesOffscreen', this._clearDatabaseCachesHandler.bind(this)]
]);
/* eslint-enable @stylistic/no-multi-spaces */
/** @type {?Promise<void>} */
this._prepareDatabasePromise = null;
}
/** */
prepare() {
chrome.runtime.onMessage.addListener(this._onMessage.bind(this));
}
/** @type {import('offscreen').ApiHandler<'clipboardGetTextOffscreen'>} */
async _getTextHandler({useRichText}) {
return await this._clipboardReader.getText(useRichText);
}
/** @type {import('offscreen').ApiHandler<'clipboardGetImageOffscreen'>} */
async _getImageHandler() {
return await this._clipboardReader.getImage();
}
/** @type {import('offscreen').ApiHandler<'clipboardSetBrowserOffscreen'>} */
_setClipboardBrowser({value}) {
this._clipboardReader.browser = value;
}
/** @type {import('offscreen').ApiHandler<'databasePrepareOffscreen'>} */
_prepareDatabaseHandler() {
if (this._prepareDatabasePromise !== null) {
return this._prepareDatabasePromise;
}
this._prepareDatabasePromise = this._dictionaryDatabase.prepare();
return this._prepareDatabasePromise;
}
/** @type {import('offscreen').ApiHandler<'getDictionaryInfoOffscreen'>} */
async _getDictionaryInfoHandler() {
return await this._dictionaryDatabase.getDictionaryInfo();
}
/** @type {import('offscreen').ApiHandler<'databasePurgeOffscreen'>} */
async _purgeDatabaseHandler() {
return await this._dictionaryDatabase.purge();
}
/** @type {import('offscreen').ApiHandler<'databaseGetMediaOffscreen'>} */
async _getMediaHandler({targets}) {
const media = await this._dictionaryDatabase.getMedia(targets);
const serializedMedia = media.map((m) => ({...m, content: arrayBufferToBase64(m.content)}));
return serializedMedia;
}
/** @type {import('offscreen').ApiHandler<'translatorPrepareOffscreen'>} */
_prepareTranslatorHandler({descriptor}) {
this._translator.prepare(descriptor);
}
/** @type {import('offscreen').ApiHandler<'findKanjiOffscreen'>} */
async _findKanjiHandler({text, options}) {
/** @type {import('translation').FindKanjiOptions} */
const modifiedOptions = {
...options,
enabledDictionaryMap: new Map(options.enabledDictionaryMap)
};
return await this._translator.findKanji(text, modifiedOptions);
}
/** @type {import('offscreen').ApiHandler<'findTermsOffscreen'>} */
async _findTermsHandler({mode, text, options}) {
const enabledDictionaryMap = new Map(options.enabledDictionaryMap);
const excludeDictionaryDefinitions = (
options.excludeDictionaryDefinitions !== null ?
new Set(options.excludeDictionaryDefinitions) :
null
);
const textReplacements = options.textReplacements.map((group) => {
if (group === null) { return null; }
return group.map((opt) => {
// https://stackoverflow.com/a/33642463
const match = opt.pattern.match(/\/(.*?)\/([a-z]*)?$/i);
const [, pattern, flags] = match !== null ? match : ['', '', ''];
return {...opt, pattern: new RegExp(pattern, flags ?? '')};
});
});
/** @type {import('translation').FindTermsOptions} */
const modifiedOptions = {
...options,
enabledDictionaryMap,
excludeDictionaryDefinitions,
textReplacements
};
return this._translator.findTerms(mode, text, modifiedOptions);
}
/** @type {import('offscreen').ApiHandler<'getTermFrequenciesOffscreen'>} */
_getTermFrequenciesHandler({termReadingList, dictionaries}) {
return this._translator.getTermFrequencies(termReadingList, dictionaries);
}
/** @type {import('offscreen').ApiHandler<'clearDatabaseCachesOffscreen'>} */
_clearDatabaseCachesHandler() {
this._translator.clearDatabaseCaches();
}
/** @type {import('extension').ChromeRuntimeOnMessageCallback<import('offscreen').ApiMessageAny>} */
_onMessage({action, params}, _sender, callback) {
return invokeApiMapHandler(this._apiMap, action, params, [], callback);
}
}
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