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-/**
- * This file is part of Haketilo.
- *
- * Function: Facilitate listening to (internal, self-generated) events.
- *
- * Copyright (C) 2021 Wojtek Kosior
- *
- * 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.
- *
- * As additional permission under GNU GPL version 3 section 7, you
- * may distribute forms of that code without the copy of the GNU
- * GPL normally required by section 4, provided you include this
- * license notice and, in case of non-source distribution, a URL
- * through which recipients can access the Corresponding Source.
- * If you modify file(s) with this exception, you may extend this
- * exception to your version of the file(s), but you are not
- * obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * As a special exception to the GPL, any HTML file which merely
- * makes function calls to this code, and for that purpose
- * includes it by reference shall be deemed a separate work for
- * copyright law purposes. If you modify this code, you may extend
- * this exception to your version of the code, but you are not
- * obligated to do so. If you do not wish to do so, delete this
- * exception statement from your version.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- *
- * I, Wojtek Kosior, thereby promise not to sue for violation of this file's
- * license. Although I request that you do not make use this code in a
- * proprietary program, I am not going to enforce this in court.
- */
-
-const make = (value=undefined) => ({value, listeners: new Set()});
-const subscribe = (observable, cb) => observable.listeners.add(cb);
-const unsubscribe = (observable, cb) => observable.listeners.delete(cb);
-
-const silent_set = (observable, value) => observable.value = value;
-const broadcast = (observable, ...values) =>
- observable.listeners.forEach(cb => cb(...values));
-
-function set(observable, value)
-{
- const old_value = observable.value;
- silent_set(observable, value);
- broadcast(observable, value, old_value);
-}
-
-const observables = {make, subscribe, unsubscribe, broadcast, silent_set, set};
-
-/*
- * EXPORTS_START
- * EXPORT observables
- * EXPORTS_END
- */