66 lines
1.6 KiB
JavaScript
66 lines
1.6 KiB
JavaScript
const MszWatcher = function() {
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const handlers = [];
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const watch = (handler, ...args) => {
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if(typeof handler !== 'function')
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throw 'handler must be a function';
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if(handlers.includes(handler))
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throw 'handler already registered';
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handlers.push(handler);
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args.push(true);
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handler(...args);
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};
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const unwatch = handler => {
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$ari(handlers, handler);
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};
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return {
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watch: watch,
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unwatch: unwatch,
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call: (...args) => {
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args.push(false);
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for(const handler of handlers)
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handler(...args);
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},
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};
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};
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const MszWatcherCollection = function() {
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const watchers = new Map;
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const getWatcher = name => {
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const watcher = watchers.get(name);
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if(watcher === undefined)
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throw 'undefined watcher name';
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return watcher;
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};
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const watch = (name, handler, ...args) => {
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getWatcher(name).watch(handler, ...args);
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};
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const unwatch = (name, handler) => {
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getWatcher(name).unwatch(handler);
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};
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return {
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watch: watch,
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unwatch: unwatch,
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define: names => {
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if(typeof names === 'string')
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watchers.set(names, new MszWatcher);
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else if(Array.isArray(names))
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for(const name of names)
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watchers.set(name, new MszWatcher);
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else
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throw 'names must be an array of names or a single name';
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},
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call: (name, ...args) => {
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getWatcher(name).call(...args);
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},
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};
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};
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