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/*
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/
*/
var gTestfile = "setPrototypeOf.js";
var BUGNUMBER = 888969;
var summary = "Scripted proxies' [[SetPrototypeOf]] behavior";
print(BUGNUMBER + ": " + summary);
/**************
* BEGIN TEST *
**************/
const log = [];
function observe(obj)
{
var observingHandler = new Proxy({}, {
get(target, p, receiver) {
log.push(p);
return Reflect.get(target, p, receiver);
}
});
return new Proxy(obj, observingHandler);
}
var p, h;
// 1. Assert: Either Type(V) is Object or Type(V) is Null.
// 2. Let handler be the value of the [[ProxyHandler]] internal slot of O.
// 3. If handler is null, throw a TypeError exception.
// 4. Assert: Type(handler) is Object.
// 5. Let target be the value of the [[ProxyTarget]] internal slot of O.
var rev = Proxy.revocable({}, {});
p = rev.proxy;
var originalProto = Reflect.getPrototypeOf(p);
assertEq(originalProto, Object.prototype);
rev.revoke();
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, originalProto),
TypeError);
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
// 6. Let trap be ? GetMethod(handler, "setPrototypeOf").
// handler has uncallable (and not null/undefined) property
p = new Proxy({}, { setPrototypeOf: 9 });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: -3.7 });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: NaN });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: Infinity });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: true });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: /x/ });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: Symbol(42) });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, { setPrototypeOf: class X {} });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
p = new Proxy({}, observe({}));
assertEq(Reflect.setPrototypeOf(p, Object.prototype), true);
assertEq(log.length, 1);
assertEq(log[0], "get");
h = observe({ setPrototypeOf() { throw 3.14; } });
p = new Proxy(Object.create(Object.prototype), h);
// "setting" without change
log.length = 0;
assertThrowsValue(() => Reflect.setPrototypeOf(p, Object.prototype),
3.14);
assertEq(log.length, 1);
assertEq(log[0], "get");
// "setting" with change
log.length = 0;
assertThrowsValue(() => Reflect.setPrototypeOf(p, /foo/),
3.14);
assertEq(log.length, 1);
assertEq(log[0], "get");
// 7. If trap is undefined, then
// a. Return ? target.[[SetPrototypeOf]](V).
var settingProtoThrows =
new Proxy({}, { setPrototypeOf() { throw "agnizes"; } });
p = new Proxy(settingProtoThrows, { setPrototypeOf: undefined });
assertThrowsValue(() => Reflect.setPrototypeOf(p, null),
"agnizes");
p = new Proxy(settingProtoThrows, { setPrototypeOf: null });
assertThrowsValue(() => Reflect.setPrototypeOf(p, null),
"agnizes");
var anotherProto =
new Proxy({},
{ setPrototypeOf(t, p) {
log.push("reached");
return Reflect.setPrototypeOf(t, p);
} });
p = new Proxy(anotherProto, { setPrototypeOf: undefined });
log.length = 0;
assertEq(Reflect.setPrototypeOf(p, null), true);
assertEq(log.length, 1);
assertEq(log[0], "reached");
p = new Proxy(anotherProto, { setPrototypeOf: null });
log.length = 0;
assertEq(Reflect.setPrototypeOf(p, null), true);
assertEq(log.length, 1);
assertEq(log[0], "reached");
// 8. Let booleanTrapResult be ToBoolean(? Call(trap, handler, « target, V »)).
// The trap callable might throw.
p = new Proxy({}, { setPrototypeOf() { throw "ohai"; } });
assertThrowsValue(() => Reflect.setPrototypeOf(p, /x/),
"ohai");
var throwingTrap =
new Proxy(function() { throw "not called"; },
{ apply() { throw 37; } });
p = new Proxy({}, { setPrototypeOf: throwingTrap });
assertThrowsValue(() => Reflect.setPrototypeOf(p, Object.prototype),
37);
// The trap callable must *only* be called.
p = new Proxy({},
{
setPrototypeOf: observe(function() { throw "boo-urns"; })
});
log.length = 0;
assertThrowsValue(() => Reflect.setPrototypeOf(p, Object.prototype),
"boo-urns");
assertEq(log.length, 1);
assertEq(log[0], "apply");
// 9. If booleanTrapResult is false, return false.
p = new Proxy({}, { setPrototypeOf() { return false; } });
assertEq(Reflect.setPrototypeOf(p, Object.prototype), false);
p = new Proxy({}, { setPrototypeOf() { return +0; } });
assertEq(Reflect.setPrototypeOf(p, Object.prototype), false);
p = new Proxy({}, { setPrototypeOf() { return -0; } });
assertEq(Reflect.setPrototypeOf(p, Object.prototype), false);
p = new Proxy({}, { setPrototypeOf() { return NaN; } });
assertEq(Reflect.setPrototypeOf(p, Object.prototype), false);
p = new Proxy({}, { setPrototypeOf() { return ""; } });
assertEq(Reflect.setPrototypeOf(p, Object.prototype), false);
p = new Proxy({}, { setPrototypeOf() { return undefined; } });
assertEq(Reflect.setPrototypeOf(p, Object.prototype), false);
// 10. Let extensibleTarget be ? IsExtensible(target).
var targetThrowIsExtensible =
new Proxy({}, { isExtensible() { throw "psych!"; } });
p = new Proxy(targetThrowIsExtensible, { setPrototypeOf() { return true; } });
assertThrowsValue(() => Reflect.setPrototypeOf(p, Object.prototype),
"psych!");
// 11. If extensibleTarget is true, return true.
var targ = {};
p = new Proxy(targ, { setPrototypeOf() { return true; } });
assertEq(Reflect.setPrototypeOf(p, /x/), true);
assertEq(Reflect.getPrototypeOf(targ), Object.prototype);
assertEq(Reflect.getPrototypeOf(p), Object.prototype);
p = new Proxy(targ, { setPrototypeOf() { return /x/; } });
assertEq(Reflect.setPrototypeOf(p, /x/), true);
assertEq(Reflect.getPrototypeOf(targ), Object.prototype);
assertEq(Reflect.getPrototypeOf(p), Object.prototype);
p = new Proxy(targ, { setPrototypeOf() { return Infinity; } });
assertEq(Reflect.setPrototypeOf(p, /x/), true);
assertEq(Reflect.getPrototypeOf(targ), Object.prototype);
assertEq(Reflect.getPrototypeOf(p), Object.prototype);
p = new Proxy(targ, { setPrototypeOf() { return Symbol(true); } });
assertEq(Reflect.setPrototypeOf(p, /x/), true);
assertEq(Reflect.getPrototypeOf(targ), Object.prototype);
assertEq(Reflect.getPrototypeOf(p), Object.prototype);
// 12. Let targetProto be ? target.[[GetPrototypeOf]]().
var targetNotExtensibleGetProtoThrows =
new Proxy(Object.preventExtensions({}),
{ getPrototypeOf() { throw NaN; } });
p = new Proxy(targetNotExtensibleGetProtoThrows,
{ setPrototypeOf() { log.push("goober"); return true; } });
log.length = 0;
assertThrowsValue(() => Reflect.setPrototypeOf(p, /abcd/),
NaN);
// 13. If SameValue(V, targetProto) is false, throw a TypeError exception.
var newProto;
p = new Proxy(Object.preventExtensions(Object.create(Math)),
{ setPrototypeOf(t, p) { return true; } });
assertThrowsInstanceOf(() => Reflect.setPrototypeOf(p, null),
TypeError);
// 14. Return true.
assertEq(Reflect.setPrototypeOf(p, Math), true);
/******************************************************************************/
if (typeof reportCompare === "function")
reportCompare(true, true);
print("Tests complete");
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