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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Flags: --harmony-proxies --harmony-reflect
var properties =
["bla", "0", 1, Symbol(), {[Symbol.toPrimitive]() {return "a"}}];
function TestForwarding(handler, myDelete, shouldThrow) {
var target = {};
var proxy = new Proxy(target, handler);
assertFalse(target.hasOwnProperty("doesnotexist"));
assertTrue(myDelete(proxy, "doesnotexist"));
for (p of properties) {
target[p] = 42;
assertTrue(myDelete(proxy, p));
assertFalse(target.hasOwnProperty(p));
}
for (p of properties) {
Object.defineProperty(target, p, {value: 42, configurable: false});
if (shouldThrow) {
assertThrows(() => myDelete(proxy, p), TypeError);
} else {
assertFalse(myDelete(proxy, p));
}
assertTrue(target.hasOwnProperty(p));
}
};
(function () {
// No trap.
var handler = {};
TestForwarding(handler,
(o, p) => delete o[p], false);
TestForwarding(handler,
(o, p) => Reflect.deleteProperty(o, p), false);
TestForwarding(handler,
(o, p) => {"use strict"; return delete o[p]}, true);
TestForwarding(handler,
(o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}, false);
})();
(function () {
// "Undefined" trap.
var handler = { deleteProperty: null };
TestForwarding(handler,
(o, p) => delete o[p], false);
TestForwarding(handler,
(o, p) => Reflect.deleteProperty(o, p), false);
TestForwarding(handler,
(o, p) => {"use strict"; return delete o[p]}, true);
TestForwarding(handler,
(o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}, false);
})();
(function () {
// Invalid trap.
var target = {};
var handler = { deleteProperty: true };
var proxy = new Proxy(target, handler);
assertThrows(() => delete proxy[0], TypeError);
assertThrows(() => Reflect.deleteProperty(proxy, 0), TypeError);
})();
function TestTrappingTrueish(myDelete) {
var handler = { deleteProperty() {return 42} };
var target = {};
var proxy = new Proxy(target, handler);
// Trap returns trueish and target doesn't own property.
for (p of properties) {
assertTrue(myDelete(proxy, p));
}
// Trap returns trueish and target property is configurable.
for (p of properties) {
target[p] = 42;
assertTrue(myDelete(proxy, p));
}
// Trap returns trueish but target property is not configurable.
for (p of properties) {
Object.defineProperty(target, p, {value: 42, configurable: false});
assertThrows(() => myDelete(proxy, p), TypeError);
}
};
TestTrappingTrueish(
(o, p) => delete o[p]);
TestTrappingTrueish(
(o, p) => Reflect.deleteProperty(o, p));
TestTrappingTrueish(
(o, p) => {"use strict"; return delete o[p]});
TestTrappingTrueish(
(o, p) => {"use strict"; return Reflect.deleteProperty(o, p)});
function TestTrappingTrueish2(myDelete) {
var handler = {
deleteProperty(target, p) {
Object.defineProperty(target, p, {configurable: false});
return 42
}
};
var target = {};
var proxy = new Proxy(target, handler);
// Trap returns trueish but target property is not configurable. In contrast
// to above, here the target property was configurable before the trap call.
for (p of properties) {
target[p] = 42;
assertThrows(() => myDelete(proxy, p), TypeError);
}
};
TestTrappingTrueish2(
(o, p) => delete o[p]);
TestTrappingTrueish2(
(o, p) => Reflect.deleteProperty(o, p));
TestTrappingTrueish2(
(o, p) => {"use strict"; return delete o[p]});
TestTrappingTrueish2(
(o, p) => {"use strict"; return Reflect.deleteProperty(o, p)});
function TestTrappingFalsish(myDelete, shouldThrow) {
var handler = { deleteProperty() {return ""} };
var target = {};
var proxy = new Proxy(target, handler);
var properties =
["bla", "0", 1, Symbol(), {[Symbol.toPrimitive]() {return "a"}}];
// Trap returns falsish and target doesn't own property.
for (p of properties) {
if (shouldThrow) {
assertThrows(() => myDelete(proxy, p), TypeError);
} else {
assertFalse(myDelete(proxy, p));
}
}
// Trap returns falsish and target property is configurable.
for (p of properties) {
target[p] = 42;
if (shouldThrow) {
assertThrows(() => myDelete(proxy, p), TypeError);
} else {
assertFalse(myDelete(proxy, p));
}
}
// Trap returns falsish and target property is not configurable.
for (p of properties) {
Object.defineProperty(target, p, {value: 42, configurable: false});
if (shouldThrow) {
assertThrows(() => myDelete(proxy, p), TypeError);
} else {
assertFalse(myDelete(proxy, p));
}
}
};
TestTrappingFalsish(
(o, p) => delete o[p], false);
TestTrappingFalsish(
(o, p) => Reflect.deleteProperty(o, p), false);
TestTrappingFalsish(
(o, p) => {"use strict"; return delete o[p]}, true);
TestTrappingFalsish(
(o, p) => {"use strict"; return Reflect.deleteProperty(o, p)}, false);
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