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 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | // Subclasses of %TypedArray% construct themselves under map, etc |
| 6 | |
| 7 | var typedArrayConstructors = [ |
| 8 | Uint8Array, |
| 9 | Int8Array, |
| 10 | Uint16Array, |
| 11 | Int16Array, |
| 12 | Uint32Array, |
| 13 | Int32Array, |
| 14 | Uint8ClampedArray, |
| 15 | Float32Array, |
| 16 | Float64Array |
| 17 | ]; |
| 18 | |
| 19 | for (let constructor of typedArrayConstructors) { |
| 20 | class MyTypedArray extends constructor { } |
| 21 | assertEquals(MyTypedArray, new MyTypedArray().map(()=>0).constructor); |
| 22 | assertEquals(MyTypedArray, new MyTypedArray().filter(()=>{}).constructor); |
| 23 | assertEquals(MyTypedArray, new MyTypedArray().slice().constructor); |
| 24 | } |
| 25 | |
| 26 | // Subclasses can override @@species to return the another class |
| 27 | |
| 28 | for (let constructor of typedArrayConstructors) { |
| 29 | class MyTypedArray extends constructor { } |
| 30 | class MyOtherTypedArray extends constructor { |
| 31 | static get [Symbol.species]() { return MyTypedArray; } |
| 32 | } |
| 33 | assertEquals(MyTypedArray, new MyOtherTypedArray().map(()=>0).constructor); |
| 34 | assertEquals(MyTypedArray, new MyOtherTypedArray().filter(()=>{}).constructor); |
| 35 | assertEquals(MyTypedArray, new MyOtherTypedArray().slice().constructor); |
| 36 | } |
| 37 | |
| 38 | // TypedArray too-short and non-TypedArray error checking |
| 39 | |
| 40 | for (let constructor of typedArrayConstructors) { |
| 41 | class MyShortTypedArray extends constructor { |
| 42 | constructor(length) { super(length - 1); } |
| 43 | } |
| 44 | assertThrows(() => new MyShortTypedArray(5).map(()=>0), TypeError); |
| 45 | assertThrows(() => new MyShortTypedArray(5).filter(()=>true), TypeError); |
| 46 | assertThrows(() => new MyShortTypedArray(5).slice(), TypeError); |
| 47 | |
| 48 | class MyNonTypedArray extends constructor { |
| 49 | static get [Symbol.species]() { return Array; } |
| 50 | } |
| 51 | assertThrows(() => new MyNonTypedArray().map(()=>0), TypeError); |
| 52 | assertThrows(() => new MyNonTypedArray().filter(()=>{}), TypeError); |
| 53 | assertThrows(() => new MyNonTypedArray().slice(), TypeError); |
| 54 | } |
| 55 | |
| 56 | // Defaults when constructor or @@species is missing or non-constructor |
| 57 | |
| 58 | for (let constructor of typedArrayConstructors) { |
| 59 | class MyDefaultTypedArray extends constructor { |
| 60 | static get [Symbol.species]() { return undefined; } |
| 61 | } |
| 62 | assertEquals(constructor, new MyDefaultTypedArray().map(()=>0).constructor); |
| 63 | |
| 64 | class MyOtherDefaultTypedArray extends constructor { } |
| 65 | assertEquals(MyOtherDefaultTypedArray, new MyOtherDefaultTypedArray().map(()=>0).constructor); |
| 66 | MyOtherDefaultTypedArray.prototype.constructor = undefined; |
| 67 | assertEquals(constructor, new MyOtherDefaultTypedArray().map(()=>0).constructor); |
| 68 | } |
| 69 | |
| 70 | // Exceptions propagated when getting constructor @@species throws |
| 71 | |
| 72 | class SpeciesError extends Error { } |
| 73 | class ConstructorError extends Error { } |
| 74 | |
| 75 | for (let constructor of typedArrayConstructors) { |
| 76 | class MyThrowingArray extends constructor { |
| 77 | static get [Symbol.species]() { throw new SpeciesError; } |
| 78 | } |
| 79 | assertThrows(() => new MyThrowingArray().map(()=>{}), SpeciesError); |
| 80 | Object.defineProperty(MyThrowingArray.prototype, 'constructor', { |
| 81 | get() { throw new ConstructorError; } |
| 82 | }); |
| 83 | assertThrows(() => new MyThrowingArray().map(()=>{}), ConstructorError); |
| 84 | } |