mirror of
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47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
// Object operations are performed in the right order, as observed by proxies.
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let log = [];
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function LoggingProxyHandlerWrapper(name, handler={}) {
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return new Proxy(handler, {
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get(t, id) {
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let method = handler[id];
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return function (...args) {
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log.push([name + "." + id, ...args.filter(v => typeof v !== "object")]);
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if (method === undefined)
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return Reflect[id].apply(null, args);
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return method.apply(this, args);
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};
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}
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});
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}
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function LoggingProxy(name, target) {
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return new Proxy(target, new LoggingProxyHandlerWrapper(name));
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}
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let proto = {x: 44};
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let proto_proxy = new LoggingProxy("proto", proto);
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let unscopables = {x: true};
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let unscopables_proxy = new LoggingProxy("unscopables", {x: true});
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let env = Object.create(proto_proxy, {
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[Symbol.unscopables]: { value: unscopables_proxy }
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});
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let env_proxy = new LoggingProxy("env", env);
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let x = 11;
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function f() {
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with (env_proxy)
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return x;
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}
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assertEq(f(), 11);
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assertDeepEq(log, [
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["env.has", "x"],
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["proto.has", "x"],
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["env.get", Symbol.unscopables],
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["unscopables.get", "x"]
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]);
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reportCompare(0, 0);
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