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// This file is part of Moodle - http://moodle.org/ // // Moodle 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. // // Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>. /** * Icon System base module. * * @module core/icon_system * @copyright 2017 Damyon Wiese * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later / import config from 'core/config'; /* * Icon System abstract class. * * Any icon system needs to define a module extending this one and return this module name from the php icon_system class. * * @class core/icon_system / export default class IconSystem { /* * A Promise which resolves to the Icon System instance. * * @private * @var {Promise<IconSystem>} / static iconSystemInstance = null; /* * Factory method to fetch the Icon System currently in use. * * @returns {Promise<IconSystem>} / static async instance() { if (this.iconSystemInstance) { return await this.iconSystemInstance; } this.iconSystemInstance = (async () => { const SystemClass = await import(config.iconsystemmodule); const instance = new SystemClass(); if (!(instance instanceof IconSystem)) { window.console.error('Class is not an IconSystem', SystemClass); throw Error(`Invalid icon system specified ${config.iconsystemmodule}. Class is not an IconSystem.`); } return await instance.init(); })(); return await this.iconSystemInstance; } /* * Initialise the icon system. * * @return {Promise<IconSystem>} / init() { return Promise.resolve(this); } /* * Render an icon. * * The key, component and title come from either the pix mustache helper tag, or the call to templates.renderIcon. * The template is the pre-loaded template string matching the template from getTemplateName() in this class. * This function must return a string (not a promise) because it is used during the internal rendering of the mustache * template (which is unfortunately synchronous). To render the mustache template in this function call * core/mustache.render() directly and do not use any partials, blocks or helper functions in the template. * * @param {string} key * @param {string} component * @param {string} title * @param {string} template * @returns {string} * @method renderIcon / // eslint-disable-next-line no-unused-vars renderIcon(key, component, title, template) { throw new Error('Abstract function not implemented.'); } /* * Get the name of the template. * * @returns {string} * @method getTemplateName */ // eslint-disable-next-line no-unused-vars getTemplateName() { throw new Error('Abstract function not implemented.'); } }

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