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// Copyright 2011 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Helper.
function TestWithProxies(test, x, y, z) {
test(function(h){ return new Proxy({}, h) }, x, y, z)
}
// Iterate over a proxy.
function TestForIn(properties, handler) {
TestWithProxies(TestForIn2, properties, handler)
}
function TestForIn2(create, properties, handler) {
var p = create(handler)
var found = []
for (var x in p) found.push(x)
assertArrayEquals(properties, found)
}
TestForIn(["0", "a"], {
ownKeys() { return ["0", "a"] },
has(target, property) { return true },
getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
})
TestForIn(["null", "a"], {
ownKeys() { return this.enumerate() },
enumerate() { return ["null", "a"] },
has(target, property) { return true },
getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
})
// Iterate over an object with a proxy prototype.
function TestForInDerived(properties, handler) {
TestWithProxies(TestForInDerived2, properties, handler)
}
function TestForInDerived2(create, properties, handler) {
var p = create(handler)
var o = Object.create(p)
o.z = 0
var found = []
for (var x in o) found.push(x)
assertArrayEquals(["z"].concat(properties), found)
var oo = Object.create(o)
oo.y = 0
var found = []
for (var x in oo) found.push(x)
assertArrayEquals(["y", "z"].concat(properties), found)
}
TestForInDerived(["0", "a"], {
ownKeys: function() { return ["0", "a"] },
has: function(t, k) { return k == "0" || k == "a" },
getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
})
TestForInDerived(["null", "a"], {
ownKeys: function() { return this.enumerate() },
enumerate: function() { return ["null", "a"] },
has: function(t, k) { return k == "null" || k == "a" },
getOwnPropertyDescriptor() { return { enumerable: true, configurable: true }}
})
// Throw exception in ownKeys trap.
function TestForInThrow(handler) {
TestWithProxies(TestForInThrow2, handler)
}
function TestForInThrow2(create, handler) {
var p = create(handler)
var o = Object.create(p)
assertThrowsEquals(function(){ for (var x in p) {} }, "myexn")
assertThrowsEquals(function(){ for (var x in o) {} }, "myexn")
}
TestForInThrow({
ownKeys: function() { throw "myexn" }
})
TestForInThrow({
ownKeys: function() { return this.enumerate() },
enumerate: function() { throw "myexn" }
})
TestForInThrow(new Proxy({}, {
get: function(pr, pk) {
return function() { throw "myexn" }
}
}));
function keys(object) {
var keys = [];
for (var k in object) {
keys.push(k);
}
return keys;
}
(function testKeysProxyOnProtoEmpty() {
var p = new Proxy({}, {
ownKeys() { return []; },
});
var o = [0];
o.__proto__ = p;
assertEquals(["0"], keys(o));
delete o[0];
assertEquals([], keys(o));
})();
(function testKeysProxyOnProto() {
var handler = {ownKeys() { return ["0"]; }};
var proxy = new Proxy({}, handler);
var object = [0];
object.__proto__ = proxy;
assertEquals(["0"], keys(object));
// The Proxy doesn't set its ownKeys enumerable.
delete object[0];
assertEquals([], keys(object));
// The [[Has]] trap has no influence on which are enumerable properties are
// shown in for-in.
handler.has = function() { return true };
assertEquals([], keys(object));
handler.getOwnPropertyDescriptor = function() {
return {enumerable: true, configurable: true}
}
assertEquals(["0"], keys(object));
})();
(function testKeysProxyProto() {
var target = {t1:true, t2:true};
var handler = {};
var proxy = new Proxy(target, handler);
assertEquals(["t1", "t2"], keys(proxy));
target.__proto__ = {p1:true, p2:true};
assertEquals(["t1", "t2", "p1", "p2"], keys(proxy));
handler.getPrototypeOf = function(target) {
return {p3:true, p4:true};
};
// for-in walks the prototype chain for the [[Has]] / Enumerable check.
assertEquals(["t1", "t2", "p3", "p4"], keys(proxy));
// [[Has]] is not used in for-in.
handler.has = function() { return false };
assertEquals(["t1", "t2", "p3", "p4"], keys(proxy));
// Proxy intercepts enumerability check.
handler.getOwnPropertyDescriptor = function() {
return {enumerable: false, configurable: true}
}
assertEquals([], keys(proxy));
handler.getOwnPropertyDescriptor = function() {
return {enumerable: true, configurable: true}
}
assertEquals(["t1", "t2", "p3", "p4"], keys(proxy));
handler.getOwnPropertyDescriptor = function(target, key) {
return {
enumerable: key in target,
configurable: true
}
}
assertEquals(["t1", "t2"], keys(proxy));
handler.getPrototypeOf = function() { throw "error" };
assertThrowsEquals(() => {keys(proxy)}, "error");
})();
(function testNestedProxy() {
var handler = {
ownKeys() {
return ['c'];
},
getOwnPropertyDescriptor() { return {configurable: true, enumerable: true } }
}
var proxy = new Proxy({}, handler);
var proxy2 = new Proxy(proxy, {});
assertEquals(['c'], keys(proxy));
assertEquals(['c'], keys(proxy2));
})();