1353b37d40
This patch moves the ES2015 Symbol.species feature from staging to shipping. @@species should be good to ship now that the regression from fast-path cases in concat, slice and splice have been addressed. R=adamk BUG=v8:4093 LOG=Y CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel Review URL: https://codereview.chromium.org/1721993002 Cr-Commit-Position: refs/heads/master@{#34226}
877 lines
25 KiB
JavaScript
877 lines
25 KiB
JavaScript
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --harmony-proxies --harmony-reflect
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(function testArrayConcatArity() {
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"use strict";
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assertEquals(1, Array.prototype.concat.length);
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})();
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(function testArrayConcatNoPrototype() {
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"use strict";
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assertEquals(void 0, Array.prototype.concat.prototype);
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})();
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(function testArrayConcatDescriptor() {
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"use strict";
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var desc = Object.getOwnPropertyDescriptor(Array.prototype, 'concat');
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assertEquals(false, desc.enumerable);
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})();
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(function testConcatArrayLike() {
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"use strict";
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var obj = {
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"length": 6,
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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var obj2 = { length: 3, "0": "0", "1": "1", "2": "2" };
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var arr = ["X", "Y", "Z"];
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assertEquals([void 0, "A", void 0, "B", void 0, "C",
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{ "length": 3, "0": "0", "1": "1", "2": "2" },
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"X", "Y", "Z"], Array.prototype.concat.call(obj, obj2, arr));
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})();
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(function testConcatArrayLikeStringLength() {
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"use strict";
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var obj = {
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"length": "6",
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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var obj2 = { length: 3, "0": "0", "1": "1", "2": "2" };
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var arr = ["X", "Y", "Z"];
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assertEquals([void 0, "A", void 0, "B", void 0, "C",
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{ "length": 3, "0": "0", "1": "1", "2": "2" },
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"X", "Y", "Z"], Array.prototype.concat.call(obj, obj2, arr));
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})();
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(function testConcatArrayLikeNegativeLength() {
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"use strict";
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var obj = {
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"length": -6,
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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assertEquals([], [].concat(obj));
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obj.length = -6.7;
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assertEquals([], [].concat(obj));
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obj.length = "-6";
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assertEquals([], [].concat(obj));
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})();
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(function testConcatArrayLikeToLengthThrows() {
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"use strict";
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var obj = {
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"length": {valueOf: null, toString: null},
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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var obj2 = { length: 3, "0": "0", "1": "1", "2": "2" };
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var arr = ["X", "Y", "Z"];
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assertThrows(function() {
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Array.prototype.concat.call(obj, obj2, arr);
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}, TypeError);
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})();
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(function testConcatArrayLikePrimitiveNonNumberLength() {
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"use strict";
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var obj = {
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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obj.length = {toString: function() { return "SIX"; }, valueOf: null };
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assertEquals([], [].concat(obj));
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obj.length = {toString: null, valueOf: function() { return "SIX"; } };
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assertEquals([], [].concat(obj));
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})();
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(function testConcatArrayLikeLengthToStringThrows() {
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"use strict";
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function MyError() {}
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var obj = {
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"length": { toString: function() {
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throw new MyError();
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}, valueOf: null
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},
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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assertThrows(function() {
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[].concat(obj);
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}, MyError);
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})();
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(function testConcatArrayLikeLengthValueOfThrows() {
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"use strict";
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function MyError() {}
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var obj = {
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"length": { valueOf: function() {
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throw new MyError();
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}, toString: null
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},
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"1": "A",
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"3": "B",
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"5": "C"
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};
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obj[Symbol.isConcatSpreadable] = true;
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assertThrows(function() {
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[].concat(obj);
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}, MyError);
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})();
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(function testConcatHoleyArray() {
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"use strict";
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var arr = [];
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arr[4] = "Item 4";
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arr[8] = "Item 8";
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var arr2 = [".", "!", "?"];
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assertEquals([void 0, void 0, void 0, void 0, "Item 4", void 0, void 0,
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void 0, "Item 8", ".", "!", "?"], arr.concat(arr2));
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})();
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(function testIsConcatSpreadableGetterThrows() {
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"use strict";
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function MyError() {}
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var obj = {};
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Object.defineProperty(obj, Symbol.isConcatSpreadable, {
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get: function() { throw new MyError(); }
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});
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assertThrows(function() {
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[].concat(obj);
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}, MyError);
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assertThrows(function() {
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Array.prototype.concat.call(obj, 1, 2, 3);
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}, MyError);
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})();
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(function testConcatLengthThrows() {
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"use strict";
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function MyError() {}
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var obj = {};
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obj[Symbol.isConcatSpreadable] = true;
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Object.defineProperty(obj, "length", {
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get: function() { throw new MyError(); }
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});
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assertThrows(function() {
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[].concat(obj);
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}, MyError);
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assertThrows(function() {
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Array.prototype.concat.call(obj, 1, 2, 3);
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}, MyError);
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})();
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(function testConcatArraySubclass() {
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"use strict";
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// If @@isConcatSpreadable is not used, the value of IsArray(O)
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// is used to determine the spreadable property.
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class A extends Array {}
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var obj = [].concat(new A(1, 2, 3), new A(4, 5, 6), new A(7, 8, 9));
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assertEquals(9, obj.length);
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for (var i = 0; i < obj.length; ++i) {
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assertEquals(i + 1, obj[i]);
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}
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// TODO(caitp): when concat is called on instances of classes which extend
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// Array, they should:
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//
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// - return an instance of the class, rather than an Array instance (if from
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// same Realm)
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// - always treat such classes as concat-spreadable
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})();
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(function testConcatArraySubclassOptOut() {
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"use strict";
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class A extends Array {
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get [Symbol.isConcatSpreadable]() { return false; }
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}
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var obj = [].concat(new A(1, 2, 3), new A(4, 5, 6), new A(7, 8, 9));
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assertEquals(3, obj.length);
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assertEquals(3, obj[0].length);
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assertEquals(3, obj[1].length);
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assertEquals(3, obj[2].length);
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})();
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(function testConcatNonArray() {
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"use strict";
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class NonArray {
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constructor() { Array.apply(this, arguments); }
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};
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var obj = new NonArray(1,2,3);
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var result = Array.prototype.concat.call(obj, 4, 5, 6);
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assertEquals(Array, result.constructor);
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assertEquals([obj,4,5,6], result);
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assertFalse(result instanceof NonArray);
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})();
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function testConcatTypedArray(type, elems, modulo) {
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"use strict";
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var items = new Array(elems);
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var ta_by_len = new type(elems);
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for (var i = 0; i < elems; ++i) {
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ta_by_len[i] = items[i] = modulo === false ? i : elems % modulo;
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}
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var ta = new type(items);
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assertEquals([ta, ta], [].concat(ta, ta));
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ta[Symbol.isConcatSpreadable] = true;
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assertEquals(items, [].concat(ta));
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assertEquals([ta_by_len, ta_by_len], [].concat(ta_by_len, ta_by_len));
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ta_by_len[Symbol.isConcatSpreadable] = true;
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assertEquals(items, [].concat(ta_by_len));
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// TypedArray with fake `length`.
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ta = new type(1);
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var defValue = ta[0];
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var expected = new Array(4000);
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expected[0] = defValue;
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Object.defineProperty(ta, "length", { value: 4000 });
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ta[Symbol.isConcatSpreadable] = true;
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assertEquals(expected, [].concat(ta));
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}
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(function testConcatSmallTypedArray() {
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var max = [Math.pow(2, 8), Math.pow(2, 16), Math.pow(2, 32), false, false];
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[
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Uint8Array,
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Uint16Array,
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Uint32Array,
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Float32Array,
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Float64Array
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].forEach(function(ctor, i) {
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testConcatTypedArray(ctor, 1, max[i]);
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});
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})();
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(function testConcatLargeTypedArray() {
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var max = [Math.pow(2, 8), Math.pow(2, 16), Math.pow(2, 32), false, false];
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[
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Uint8Array,
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Uint16Array,
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Uint32Array,
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Float32Array,
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Float64Array
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].forEach(function(ctor, i) {
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testConcatTypedArray(ctor, 4000, max[i]);
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});
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})();
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(function testConcatStrictArguments() {
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var args = (function(a, b, c) { "use strict"; return arguments; })(1,2,3);
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args[Symbol.isConcatSpreadable] = true;
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assertEquals([1, 2, 3, 1, 2, 3], [].concat(args, args));
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Object.defineProperty(args, "length", { value: 6 });
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assertEquals([1, 2, 3, void 0, void 0, void 0], [].concat(args));
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})();
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(function testConcatSloppyArguments() {
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var args = (function(a, b, c) { return arguments; })(1,2,3);
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args[Symbol.isConcatSpreadable] = true;
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assertEquals([1, 2, 3, 1, 2, 3], [].concat(args, args));
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Object.defineProperty(args, "length", { value: 6 });
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assertEquals([1, 2, 3, void 0, void 0, void 0], [].concat(args));
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})();
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(function testConcatSloppyArgumentsWithDupes() {
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var args = (function(a, a, a) { return arguments; })(1,2,3);
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args[Symbol.isConcatSpreadable] = true;
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assertEquals([1, 2, 3, 1, 2, 3], [].concat(args, args));
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Object.defineProperty(args, "length", { value: 6 });
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assertEquals([1, 2, 3, void 0, void 0, void 0], [].concat(args));
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})();
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(function testConcatSloppyArgumentsThrows() {
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function MyError() {}
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var args = (function(a) { return arguments; })(1,2,3);
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Object.defineProperty(args, 0, {
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get: function() { throw new MyError(); }
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});
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args[Symbol.isConcatSpreadable] = true;
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assertThrows(function() {
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return [].concat(args, args);
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}, MyError);
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})();
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(function testConcatHoleySloppyArguments() {
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var args = (function(a) { return arguments; })(1,2,3);
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delete args[1];
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args[Symbol.isConcatSpreadable] = true;
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assertEquals([1, void 0, 3, 1, void 0, 3], [].concat(args, args));
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})();
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(function testConcatSpreadableStringWrapper() {
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"use strict";
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var str1 = new String("yuck\uD83D\uDCA9")
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// String wrapper objects are not concat-spreadable by default
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assertEquals([str1], [].concat(str1));
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// String wrapper objects may be individually concat-spreadable
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str1[Symbol.isConcatSpreadable] = true;
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assertEquals(["y", "u", "c", "k", "\uD83D", "\uDCA9"],
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[].concat(str1));
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String.prototype[Symbol.isConcatSpreadable] = true;
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// String wrapper objects may be concat-spreadable
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assertEquals(["y", "u", "c", "k", "\uD83D", "\uDCA9"],
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[].concat(new String("yuck\uD83D\uDCA9")));
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// String values are never concat-spreadable
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assertEquals(["yuck\uD83D\uDCA9"], [].concat("yuck\uD83D\uDCA9"));
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delete String.prototype[Symbol.isConcatSpreadable];
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})();
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(function testConcatSpreadableBooleanWrapper() {
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"use strict";
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var bool = new Boolean(true)
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// Boolean wrapper objects are not concat-spreadable by default
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assertEquals([bool], [].concat(bool));
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// Boolean wrapper objects may be individually concat-spreadable
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bool[Symbol.isConcatSpreadable] = true;
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bool.length = 3;
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bool[0] = 1, bool[1] = 2, bool[2] = 3;
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assertEquals([1, 2, 3], [].concat(bool));
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Boolean.prototype[Symbol.isConcatSpreadable] = true;
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// Boolean wrapper objects may be concat-spreadable
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assertEquals([], [].concat(new Boolean(true)));
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Boolean.prototype[0] = 1;
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Boolean.prototype[1] = 2;
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Boolean.prototype[2] = 3;
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Boolean.prototype.length = 3;
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assertEquals([1,2,3], [].concat(new Boolean(true)));
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// Boolean values are never concat-spreadable
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assertEquals([true], [].concat(true));
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delete Boolean.prototype[Symbol.isConcatSpreadable];
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delete Boolean.prototype[0];
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delete Boolean.prototype[1];
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delete Boolean.prototype[2];
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delete Boolean.prototype.length;
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})();
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(function testConcatSpreadableNumberWrapper() {
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"use strict";
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var num = new Number(true)
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// Number wrapper objects are not concat-spreadable by default
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assertEquals([num], [].concat(num));
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// Number wrapper objects may be individually concat-spreadable
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num[Symbol.isConcatSpreadable] = true;
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num.length = 3;
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num[0] = 1, num[1] = 2, num[2] = 3;
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assertEquals([1, 2, 3], [].concat(num));
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Number.prototype[Symbol.isConcatSpreadable] = true;
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// Number wrapper objects may be concat-spreadable
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assertEquals([], [].concat(new Number(123)));
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Number.prototype[0] = 1;
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Number.prototype[1] = 2;
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Number.prototype[2] = 3;
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Number.prototype.length = 3;
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assertEquals([1,2,3], [].concat(new Number(123)));
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// Number values are never concat-spreadable
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assertEquals([true], [].concat(true));
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delete Number.prototype[Symbol.isConcatSpreadable];
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delete Number.prototype[0];
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delete Number.prototype[1];
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delete Number.prototype[2];
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delete Number.prototype.length;
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})();
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(function testConcatSpreadableFunction() {
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"use strict";
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var fn = function(a, b, c) {}
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// Functions are not concat-spreadable by default
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assertEquals([fn], [].concat(fn));
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// Functions may be individually concat-spreadable
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fn[Symbol.isConcatSpreadable] = true;
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fn[0] = 1, fn[1] = 2, fn[2] = 3;
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assertEquals([1, 2, 3], [].concat(fn));
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Function.prototype[Symbol.isConcatSpreadable] = true;
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// Functions may be concat-spreadable
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assertEquals([void 0, void 0, void 0], [].concat(function(a,b,c) {}));
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Function.prototype[0] = 1;
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Function.prototype[1] = 2;
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Function.prototype[2] = 3;
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assertEquals([1,2,3], [].concat(function(a, b, c) {}));
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delete Function.prototype[Symbol.isConcatSpreadable];
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delete Function.prototype[0];
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delete Function.prototype[1];
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delete Function.prototype[2];
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})();
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(function testConcatSpreadableRegExp() {
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"use strict";
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var re = /abc/;
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// RegExps are not concat-spreadable by default
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assertEquals([re], [].concat(re));
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// RegExps may be individually concat-spreadable
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re[Symbol.isConcatSpreadable] = true;
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re[0] = 1, re[1] = 2, re[2] = 3, re.length = 3;
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assertEquals([1, 2, 3], [].concat(re));
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// RegExps may be concat-spreadable
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RegExp.prototype[Symbol.isConcatSpreadable] = true;
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RegExp.prototype.length = 3;
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assertEquals([void 0, void 0, void 0], [].concat(/abc/));
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RegExp.prototype[0] = 1;
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RegExp.prototype[1] = 2;
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RegExp.prototype[2] = 3;
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assertEquals([1,2,3], [].concat(/abc/));
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delete RegExp.prototype[Symbol.isConcatSpreadable];
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delete RegExp.prototype[0];
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delete RegExp.prototype[1];
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delete RegExp.prototype[2];
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delete RegExp.prototype.length;
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})();
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(function testArrayConcatSpreadableSparseObject() {
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"use strict";
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var obj = { length: 5 };
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obj[Symbol.isConcatSpreadable] = true;
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assertEquals([void 0, void 0, void 0, void 0, void 0], [].concat(obj));
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obj.length = 4000;
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assertEquals(new Array(4000), [].concat(obj));
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})();
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// ES5 tests
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(function testArrayConcatES5() {
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"use strict";
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var poses;
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var pos;
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poses = [140, 4000000000];
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while (pos = poses.shift()) {
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var a = new Array(pos);
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var array_proto = [];
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a.__proto__ = array_proto;
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assertEquals(pos, a.length);
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a.push('foo');
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assertEquals(pos + 1, a.length);
|
|
var b = ['bar'];
|
|
var c = a.concat(b);
|
|
assertEquals(pos + 2, c.length);
|
|
assertEquals("undefined", typeof(c[pos - 1]));
|
|
assertEquals("foo", c[pos]);
|
|
assertEquals("bar", c[pos + 1]);
|
|
|
|
// Can we fool the system by putting a number in a string?
|
|
var onetwofour = "124";
|
|
a[onetwofour] = 'doo';
|
|
assertEquals(a[124], 'doo');
|
|
c = a.concat(b);
|
|
assertEquals(c[124], 'doo');
|
|
|
|
// If we put a number in the prototype, then the spec says it should be
|
|
// copied on concat.
|
|
array_proto["123"] = 'baz';
|
|
assertEquals(a[123], 'baz');
|
|
|
|
c = a.concat(b);
|
|
assertEquals(pos + 2, c.length);
|
|
assertEquals("baz", c[123]);
|
|
assertEquals("undefined", typeof(c[pos - 1]));
|
|
assertEquals("foo", c[pos]);
|
|
assertEquals("bar", c[pos + 1]);
|
|
|
|
// When we take the number off the prototype it disappears from a, but
|
|
// the concat put it in c itself.
|
|
array_proto["123"] = undefined;
|
|
assertEquals("undefined", typeof(a[123]));
|
|
assertEquals("baz", c[123]);
|
|
|
|
// If the element of prototype is shadowed, the element on the instance
|
|
// should be copied, but not the one on the prototype.
|
|
array_proto[123] = 'baz';
|
|
a[123] = 'xyz';
|
|
assertEquals('xyz', a[123]);
|
|
c = a.concat(b);
|
|
assertEquals('xyz', c[123]);
|
|
|
|
// Non-numeric properties on the prototype or the array shouldn't get
|
|
// copied.
|
|
array_proto.moe = 'joe';
|
|
a.ben = 'jerry';
|
|
assertEquals(a["moe"], 'joe');
|
|
assertEquals(a["ben"], 'jerry');
|
|
c = a.concat(b);
|
|
// ben was not copied
|
|
assertEquals("undefined", typeof(c.ben));
|
|
|
|
// When we take moe off the prototype it disappears from all arrays.
|
|
array_proto.moe = undefined;
|
|
assertEquals("undefined", typeof(c.moe));
|
|
|
|
// Negative indices don't get concated.
|
|
a[-1] = 'minus1';
|
|
assertEquals("minus1", a[-1]);
|
|
assertEquals("undefined", typeof(a[0xffffffff]));
|
|
c = a.concat(b);
|
|
assertEquals("undefined", typeof(c[-1]));
|
|
assertEquals("undefined", typeof(c[0xffffffff]));
|
|
assertEquals(c.length, a.length + 1);
|
|
}
|
|
|
|
poses = [140, 4000000000];
|
|
while (pos = poses.shift()) {
|
|
var a = new Array(pos);
|
|
assertEquals(pos, a.length);
|
|
a.push('foo');
|
|
assertEquals(pos + 1, a.length);
|
|
var b = ['bar'];
|
|
var c = a.concat(b);
|
|
assertEquals(pos + 2, c.length);
|
|
assertEquals("undefined", typeof(c[pos - 1]));
|
|
assertEquals("foo", c[pos]);
|
|
assertEquals("bar", c[pos + 1]);
|
|
|
|
// Can we fool the system by putting a number in a string?
|
|
var onetwofour = "124";
|
|
a[onetwofour] = 'doo';
|
|
assertEquals(a[124], 'doo');
|
|
c = a.concat(b);
|
|
assertEquals(c[124], 'doo');
|
|
|
|
// If we put a number in the prototype, then the spec says it should be
|
|
// copied on concat.
|
|
Array.prototype["123"] = 'baz';
|
|
assertEquals(a[123], 'baz');
|
|
|
|
c = a.concat(b);
|
|
assertEquals(pos + 2, c.length);
|
|
assertEquals("baz", c[123]);
|
|
assertEquals("undefined", typeof(c[pos - 1]));
|
|
assertEquals("foo", c[pos]);
|
|
assertEquals("bar", c[pos + 1]);
|
|
|
|
// When we take the number off the prototype it disappears from a, but
|
|
// the concat put it in c itself.
|
|
Array.prototype["123"] = undefined;
|
|
assertEquals("undefined", typeof(a[123]));
|
|
assertEquals("baz", c[123]);
|
|
|
|
// If the element of prototype is shadowed, the element on the instance
|
|
// should be copied, but not the one on the prototype.
|
|
Array.prototype[123] = 'baz';
|
|
a[123] = 'xyz';
|
|
assertEquals('xyz', a[123]);
|
|
c = a.concat(b);
|
|
assertEquals('xyz', c[123]);
|
|
|
|
// Non-numeric properties on the prototype or the array shouldn't get
|
|
// copied.
|
|
Array.prototype.moe = 'joe';
|
|
a.ben = 'jerry';
|
|
assertEquals(a["moe"], 'joe');
|
|
assertEquals(a["ben"], 'jerry');
|
|
c = a.concat(b);
|
|
// ben was not copied
|
|
assertEquals("undefined", typeof(c.ben));
|
|
// moe was not copied, but we can see it through the prototype
|
|
assertEquals("joe", c.moe);
|
|
|
|
// When we take moe off the prototype it disappears from all arrays.
|
|
Array.prototype.moe = undefined;
|
|
assertEquals("undefined", typeof(c.moe));
|
|
|
|
// Negative indices don't get concated.
|
|
a[-1] = 'minus1';
|
|
assertEquals("minus1", a[-1]);
|
|
assertEquals("undefined", typeof(a[0xffffffff]));
|
|
c = a.concat(b);
|
|
assertEquals("undefined", typeof(c[-1]));
|
|
assertEquals("undefined", typeof(c[0xffffffff]));
|
|
assertEquals(c.length, a.length + 1);
|
|
|
|
}
|
|
|
|
a = [];
|
|
c = a.concat('Hello');
|
|
assertEquals(1, c.length);
|
|
assertEquals("Hello", c[0]);
|
|
assertEquals("Hello", c.toString());
|
|
|
|
// Check that concat preserves holes.
|
|
var holey = [void 0,'a',,'c'].concat(['d',,'f',[0,,2],void 0])
|
|
assertEquals(9, holey.length); // hole in embedded array is ignored
|
|
for (var i = 0; i < holey.length; i++) {
|
|
if (i == 2 || i == 5) {
|
|
assertFalse(i in holey);
|
|
} else {
|
|
assertTrue(i in holey);
|
|
}
|
|
}
|
|
|
|
// Polluted prototype from prior tests.
|
|
delete Array.prototype[123];
|
|
|
|
// Check that concat reads getters in the correct order.
|
|
var arr1 = [,2];
|
|
var arr2 = [1,3];
|
|
var r1 = [].concat(arr1, arr2); // [,2,1,3]
|
|
assertEquals([,2,1,3], r1);
|
|
|
|
// Make first array change length of second array.
|
|
Object.defineProperty(arr1, 0, {get: function() {
|
|
arr2.push("X");
|
|
return undefined;
|
|
}, configurable: true})
|
|
var r2 = [].concat(arr1, arr2); // [undefined,2,1,3,"X"]
|
|
assertEquals([undefined,2,1,3,"X"], r2);
|
|
|
|
// Make first array change length of second array massively.
|
|
arr2.length = 2;
|
|
Object.defineProperty(arr1, 0, {get: function() {
|
|
arr2[500000] = "X";
|
|
return undefined;
|
|
}, configurable: true})
|
|
var r3 = [].concat(arr1, arr2); // [undefined,2,1,3,"X"]
|
|
var expected = [undefined,2,1,3];
|
|
expected[500000 + 2] = "X";
|
|
|
|
assertEquals(expected, r3);
|
|
|
|
var arr3 = [];
|
|
var trace = [];
|
|
var expectedTrace = []
|
|
function mkGetter(i) { return function() { trace.push(i); }; }
|
|
arr3.length = 10000;
|
|
for (var i = 0; i < 100; i++) {
|
|
Object.defineProperty(arr3, i * i, {get: mkGetter(i)});
|
|
expectedTrace[i] = i;
|
|
expectedTrace[100 + i] = i;
|
|
}
|
|
var r4 = [0].concat(arr3, arr3);
|
|
assertEquals(1 + arr3.length * 2, r4.length);
|
|
assertEquals(expectedTrace, trace);
|
|
|
|
// Clean up.
|
|
delete Array.prototype[123];
|
|
delete Array.prototype["123"];
|
|
delete Array.prototype["moe"];
|
|
})();
|
|
|
|
|
|
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
// Tests with proxies
|
|
|
|
// Note: concat does not currently support species so there is no difference
|
|
// between [].concat(foo) and Array.prototype.concat.apply(foo).
|
|
|
|
|
|
var log = [];
|
|
var logger = {};
|
|
var handler = new Proxy({}, logger);
|
|
|
|
logger.get = function(t, trap, r) {
|
|
return function(...args) {
|
|
log.push([trap, ...args]);
|
|
return Reflect[trap](...args);
|
|
}
|
|
};
|
|
|
|
|
|
(function testUnspreadableNonArrayLikeProxy() {
|
|
var target = {0: "a", 1: "b"};
|
|
var obj = new Proxy(target, handler);
|
|
|
|
log.length = 0;
|
|
assertEquals([obj], [].concat(obj));
|
|
assertEquals(1, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
|
|
log.length = 0;
|
|
assertEquals([obj], Array.prototype.concat.apply(obj));
|
|
assertEquals(1, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
})();
|
|
|
|
|
|
(function testSpreadableNonArrayLikeProxy() {
|
|
var target = {0: "a", 1: "b", [Symbol.isConcatSpreadable]: "truish"};
|
|
var obj = new Proxy(target, handler);
|
|
|
|
log.length = 0;
|
|
assertEquals([], [].concat(obj));
|
|
assertEquals(2, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
assertEquals(["get", target, "length", obj], log[1]);
|
|
|
|
log.length = 0;
|
|
assertEquals([], Array.prototype.concat.apply(obj));
|
|
assertEquals(2, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
assertEquals(["get", target, "length", obj], log[1]);
|
|
|
|
target.length = 3;
|
|
|
|
log.length = 0;
|
|
assertEquals(["a", "b", undefined], [].concat(obj));
|
|
assertEquals(7, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
assertEquals(["get", target, "length", obj], log[1]);
|
|
assertEquals(["has", target, "0"], log[2]);
|
|
assertEquals(["get", target, "0", obj], log[3]);
|
|
assertEquals(["has", target, "1"], log[4]);
|
|
assertEquals(["get", target, "1", obj], log[5]);
|
|
assertEquals(["has", target, "2"], log[6]);
|
|
|
|
log.length = 0;
|
|
assertEquals(["a", "b", undefined], Array.prototype.concat.apply(obj));
|
|
assertEquals(7, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
assertEquals(["get", target, "length", obj], log[1]);
|
|
assertEquals(["has", target, "0"], log[2]);
|
|
assertEquals(["get", target, "0", obj], log[3]);
|
|
assertEquals(["has", target, "1"], log[4]);
|
|
assertEquals(["get", target, "1", obj], log[5]);
|
|
assertEquals(["has", target, "2"], log[6]);
|
|
})();
|
|
|
|
|
|
(function testUnspreadableArrayLikeProxy() {
|
|
var target = ["a", "b"];
|
|
target[Symbol.isConcatSpreadable] = "";
|
|
var obj = new Proxy(target, handler);
|
|
|
|
log.length = 0;
|
|
assertEquals([obj], [].concat(obj));
|
|
assertEquals(1, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
|
|
log.length = 0;
|
|
assertEquals([obj], Array.prototype.concat.apply(obj));
|
|
assertEquals(2, log.length); // An extra read for the constructor
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, "constructor", obj], log[0]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[1]);
|
|
})();
|
|
|
|
|
|
(function testSpreadableArrayLikeProxy() {
|
|
var target = ["a", "b"];
|
|
target[Symbol.isConcatSpreadable] = undefined;
|
|
var obj = new Proxy(target, handler);
|
|
|
|
log.length = 0;
|
|
assertEquals(["a", "b"], [].concat(obj));
|
|
assertEquals(6, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
|
|
assertEquals(["get", target, "length", obj], log[1]);
|
|
assertEquals(["has", target, "0"], log[2]);
|
|
assertEquals(["get", target, "0", obj], log[3]);
|
|
assertEquals(["has", target, "1"], log[4]);
|
|
assertEquals(["get", target, "1", obj], log[5]);
|
|
|
|
log.length = 0;
|
|
assertEquals(["a", "b"], Array.prototype.concat.apply(obj));
|
|
assertEquals(7, log.length);
|
|
for (var i in log) assertSame(target, log[i][1]);
|
|
assertEquals(["get", target, "constructor", obj], log[0]);
|
|
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[1]);
|
|
assertEquals(["get", target, "length", obj], log[2]);
|
|
assertEquals(["has", target, "0"], log[3]);
|
|
assertEquals(["get", target, "0", obj], log[4]);
|
|
assertEquals(["has", target, "1"], log[5]);
|
|
assertEquals(["get", target, "1", obj], log[6]);
|
|
})();
|
|
|
|
|
|
(function testSpreadableArrayLikeProxyWithNontrivialLength() {
|
|
var getTrap = function(t, key) {
|
|
if (key === "length") return {[Symbol.toPrimitive]() {return 3}};
|
|
if (key === "2") return "baz";
|
|
if (key === "3") return "bar";
|
|
};
|
|
var target = [];
|
|
var obj = new Proxy(target, {get: getTrap, has: () => true});
|
|
|
|
assertEquals([undefined, undefined, "baz"], [].concat(obj));
|
|
assertEquals([undefined, undefined, "baz"], Array.prototype.concat.apply(obj))
|
|
})();
|
|
|
|
|
|
(function testSpreadableArrayLikeProxyWithBogusLength() {
|
|
var getTrap = function(t, key) {
|
|
if (key === "length") return Symbol();
|
|
if (key === "2") return "baz";
|
|
if (key === "3") return "bar";
|
|
};
|
|
var target = [];
|
|
var obj = new Proxy(target, {get: getTrap, has: () => true});
|
|
|
|
assertThrows(() => [].concat(obj), TypeError);
|
|
assertThrows(() => Array.prototype.concat.apply(obj), TypeError);
|
|
})();
|