/* * Copyright (C) 2021-2022 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/>. */ /** * This class controls the registration of accessibility handlers. */ class AccessibilityController { /** * Creates a new instance. * @param {ScriptManager} scriptManager An instance of the `ScriptManager` class. */ constructor(scriptManager) { this._scriptManager = scriptManager; this._updateGoogleDocsAccessibilityToken = null; this._updateGoogleDocsAccessibilityPromise = null; this._forceGoogleDocsHtmlRenderingAny = false; } /** * Updates the accessibility handlers. * @param {object} fullOptions The full options object from the `Backend` instance. * The value is treated as read-only and is not modified. */ async update(fullOptions) { let forceGoogleDocsHtmlRenderingAny = false; for (const {options} of fullOptions.profiles) { if (options.accessibility.forceGoogleDocsHtmlRendering) { forceGoogleDocsHtmlRenderingAny = true; break; } } await this._updateGoogleDocsAccessibility(forceGoogleDocsHtmlRenderingAny); } // Private async _updateGoogleDocsAccessibility(forceGoogleDocsHtmlRenderingAny) { // Reentrant token const token = {}; this._updateGoogleDocsAccessibilityToken = token; // Wait for previous let promise = this._updateGoogleDocsAccessibilityPromise; if (promise !== null) { await promise; } // Reentrant check if (this._updateGoogleDocsAccessibilityToken !== token) { return; } // Update promise = this._updateGoogleDocsAccessibilityInner(forceGoogleDocsHtmlRenderingAny); this._updateGoogleDocsAccessibilityPromise = promise; await promise; this._updateGoogleDocsAccessibilityPromise = null; } async _updateGoogleDocsAccessibilityInner(forceGoogleDocsHtmlRenderingAny) { if (this._forceGoogleDocsHtmlRenderingAny === forceGoogleDocsHtmlRenderingAny) { return; } this._forceGoogleDocsHtmlRenderingAny = forceGoogleDocsHtmlRenderingAny; const id = 'googleDocsAccessibility'; try { if (forceGoogleDocsHtmlRenderingAny) { if (await this._scriptManager.isContentScriptRegistered(id)) { return; } const details = { allFrames: true, matchAboutBlank: true, matches: ['*://docs.google.com/*'], urlMatches: '^[^:]*://docs.google.com/[\\w\\W]*$', runAt: 'document_start', js: ['js/accessibility/google-docs.js'] }; await this._scriptManager.registerContentScript(id, details); } else { await this._scriptManager.unregisterContentScript(id); } } catch (e) { log.error(e); } } }