84 lines
2.3 KiB
JavaScript
84 lines
2.3 KiB
JavaScript
const MszWatcher = function() {
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let watchers = [];
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return {
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watch: function(watcher, thisArg, args) {
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if(typeof watcher !== 'function')
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throw 'watcher must be a function';
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if(watchers.indexOf(watcher) >= 0)
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return;
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watchers.push(watcher);
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if(thisArg !== undefined) {
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if(!Array.isArray(args)) {
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if(args !== undefined)
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args = [args];
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else args = [];
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}
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// initial call
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args.push(true);
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watcher.apply(thisArg, args);
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}
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},
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unwatch: function(watcher) {
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$ari(watchers, watcher);
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},
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call: function(thisArg, args) {
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if(!Array.isArray(args)) {
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if(args !== undefined)
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args = [args];
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else args = [];
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}
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args.push(false);
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for(const watcher of watchers)
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watcher.apply(thisArg, 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 collection = new Map;
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const watch = function(name, watcher, thisArg, args) {
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const watchers = collection.get(name);
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if(watchers === undefined)
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throw 'undefined watcher name';
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watchers.watch(watcher, thisArg, args);
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};
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const unwatch = function(name, watcher) {
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const watchers = collection.get(name);
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if(watchers === undefined)
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throw 'undefined watcher name';
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watchers.unwatch(watcher);
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};
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return {
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define: function(names) {
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if(!Array.isArray(names))
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names = [names];
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for(const name of names)
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collection.set(name, new MszWatcher);
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},
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call: function(name, thisArg, args) {
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const watchers = collection.get(name);
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if(watchers === undefined)
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throw 'undefined watcher name';
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watchers.call(thisArg, args);
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},
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watch: watch,
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unwatch: unwatch,
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proxy: function(obj) {
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obj.watch = function(name, watcher) {
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watch(name, watcher);
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};
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obj.unwatch = unwatch;
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},
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};
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};
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