Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | var typedArrayConstructors = [ |
| 6 | Uint8Array, |
| 7 | Int8Array, |
| 8 | Uint16Array, |
| 9 | Int16Array, |
| 10 | Uint32Array, |
| 11 | Int32Array, |
| 12 | Uint8ClampedArray, |
| 13 | Float32Array, |
| 14 | Float64Array |
| 15 | ]; |
| 16 | |
| 17 | for (var constructor of typedArrayConstructors) { |
| 18 | assertEquals(1, constructor.from.length); |
| 19 | |
| 20 | // TypedArray.from only callable on this subclassing %TypedArray% |
| 21 | assertThrows(function () {constructor.from.call(Array, [])}, TypeError); |
| 22 | |
| 23 | function assertArrayLikeEquals(value, expected, type) { |
| 24 | assertEquals(value.__proto__, type.prototype); |
| 25 | assertEquals(expected.length, value.length); |
| 26 | for (var i = 0; i < value.length; ++i) { |
| 27 | assertEquals(expected[i], value[i]); |
| 28 | } |
| 29 | } |
| 30 | |
| 31 | // Assert that calling mapfn with / without thisArg in sloppy and strict modes |
| 32 | // works as expected. |
| 33 | var global = this; |
| 34 | function non_strict() { assertEquals(global, this); } |
| 35 | function strict() { 'use strict'; assertEquals(undefined, this); } |
| 36 | function strict_null() { 'use strict'; assertEquals(null, this); } |
| 37 | constructor.from([1], non_strict); |
| 38 | constructor.from([1], non_strict, void 0); |
| 39 | constructor.from([1], non_strict, null); |
| 40 | constructor.from([1], strict); |
| 41 | constructor.from([1], strict, void 0); |
| 42 | constructor.from([1], strict_null, null); |
| 43 | |
| 44 | // TypedArray.from can only be called on TypedArray constructors |
| 45 | assertThrows(function() {constructor.from.call({}, [])}, TypeError); |
| 46 | assertThrows(function() {constructor.from.call([], [])}, TypeError); |
| 47 | assertThrows(function() {constructor.from.call(1, [])}, TypeError); |
| 48 | assertThrows(function() {constructor.from.call(undefined, [])}, TypeError); |
| 49 | |
| 50 | // Converting from various other types, demonstrating that it can |
| 51 | // operate on array-like objects as well as iterables. |
| 52 | // TODO(littledan): constructors should have similar flexibility. |
| 53 | assertArrayLikeEquals(constructor.from( |
| 54 | { length: 1, 0: 5 }), [5], constructor); |
| 55 | |
| 56 | assertArrayLikeEquals(constructor.from( |
| 57 | { length: -1, 0: 5 }), [], constructor); |
| 58 | |
| 59 | assertArrayLikeEquals(constructor.from( |
| 60 | [1, 2, 3]), [1, 2, 3], constructor); |
| 61 | |
| 62 | var set = new Set([1, 2, 3]); |
| 63 | assertArrayLikeEquals(constructor.from(set), [1, 2, 3], |
| 64 | constructor); |
| 65 | |
| 66 | function* generator() { |
| 67 | yield 4; |
| 68 | yield 5; |
| 69 | yield 6; |
| 70 | } |
| 71 | |
| 72 | assertArrayLikeEquals(constructor.from(generator()), |
| 73 | [4, 5, 6], constructor); |
| 74 | |
| 75 | assertThrows(function() { constructor.from(null); }, TypeError); |
| 76 | assertThrows(function() { constructor.from(undefined); }, TypeError); |
| 77 | assertThrows(function() { constructor.from([], null); }, TypeError); |
| 78 | assertThrows(function() { constructor.from([], 'noncallable'); }, |
| 79 | TypeError); |
| 80 | |
| 81 | var nullIterator = {}; |
| 82 | nullIterator[Symbol.iterator] = null; |
| 83 | assertArrayLikeEquals(constructor.from(nullIterator), [], |
| 84 | constructor); |
| 85 | |
| 86 | var nonObjIterator = {}; |
| 87 | nonObjIterator[Symbol.iterator] = function() { return 'nonObject'; }; |
| 88 | assertThrows(function() { constructor.from(nonObjIterator); }, |
| 89 | TypeError); |
| 90 | |
| 91 | assertThrows(function() { constructor.from([], null); }, TypeError); |
| 92 | |
| 93 | // Ensure iterator is only accessed once, and only invoked once |
| 94 | var called = 0; |
| 95 | var arr = [1, 2, 3]; |
| 96 | var obj = {}; |
| 97 | var counter = 0; |
| 98 | |
| 99 | // Test order --- only get iterator method once |
| 100 | function testIterator() { |
| 101 | called++; |
| 102 | assertEquals(obj, this); |
| 103 | return arr[Symbol.iterator](); |
| 104 | } |
| 105 | var getCalled = 0; |
| 106 | Object.defineProperty(obj, Symbol.iterator, { |
| 107 | get: function() { |
| 108 | getCalled++; |
| 109 | return testIterator; |
| 110 | }, |
| 111 | set: function() { |
| 112 | assertUnreachable('@@iterator should not be set'); |
| 113 | } |
| 114 | }); |
| 115 | assertArrayLikeEquals(constructor.from(obj), [1, 2, 3], constructor); |
| 116 | assertEquals(getCalled, 1); |
| 117 | assertEquals(called, 1); |
| 118 | |
| 119 | assertEquals(constructor, Uint8Array.from.call(constructor, [1]).constructor); |
| 120 | assertEquals(Uint8Array, constructor.from.call(Uint8Array, [1]).constructor); |
| 121 | } |