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✏️ Editing: icon_system.js

// 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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