| // 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: --allow-natives-syntax |
| |
| var typedArrayConstructors = [ |
| Uint8Array, |
| Int8Array, |
| Uint16Array, |
| Int16Array, |
| Uint32Array, |
| Int32Array, |
| Uint8ClampedArray, |
| Float32Array, |
| Float64Array |
| ]; |
| |
| for (var constructor of typedArrayConstructors) { |
| // Check various variants of empty array's slicing. |
| var array = new constructor(0); |
| for (var i = 0; i < 7; i++) { |
| assertEquals(0, array.slice(0, 0).length); |
| assertEquals(0, array.slice(1, 0).length); |
| assertEquals(0, array.slice(0, 1).length); |
| assertEquals(0, array.slice(-1, 0).length); |
| } |
| |
| |
| // Check various forms of arguments omission. |
| array = new constructor(7); |
| |
| for (var i = 0; i < 7; i++) { |
| assertEquals(array, array.slice()); |
| assertEquals(array, array.slice(0)); |
| assertEquals(array, array.slice(undefined)); |
| assertEquals(array, array.slice("foobar")); |
| assertEquals(array, array.slice(undefined, undefined)); |
| } |
| |
| |
| // Check variants of negatives and positive indices. |
| array = new constructor(7); |
| |
| assertEquals(7, array.slice(-100).length); |
| assertEquals(3, array.slice(-3).length); |
| assertEquals(3, array.slice(4).length); |
| assertEquals(1, array.slice(6).length); |
| assertEquals(0, array.slice(7).length); |
| assertEquals(0, array.slice(8).length); |
| assertEquals(0, array.slice(100).length); |
| |
| assertEquals(0, array.slice(0, -100).length); |
| assertEquals(4, array.slice(0, -3).length); |
| assertEquals(4, array.slice(0, 4).length); |
| assertEquals(6, array.slice(0, 6).length); |
| assertEquals(7, array.slice(0, 7).length); |
| assertEquals(7, array.slice(0, 8).length); |
| assertEquals(7, array.slice(0, 100).length); |
| |
| // Does not permit being called on other types |
| assertThrows(() => constructor.prototype.slice.call([], 0, 0), TypeError); |
| |
| // Check that elements are copied properly in slice |
| array = new constructor([1, 2, 3, 4]); |
| var slice = array.slice(1, 3); |
| assertEquals(2, slice.length); |
| assertEquals(2, slice[0]); |
| assertEquals(3, slice[1]); |
| assertTrue(slice instanceof constructor); |
| |
| // Detached Operation |
| var tmp = { |
| [Symbol.toPrimitive]() { |
| assertUnreachable("Parameter should not be processed when " + |
| "array.[[ViewedArrayBuffer]] is neutered."); |
| return 0; |
| } |
| }; |
| var array = new constructor([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); |
| %ArrayBufferNeuter(array.buffer); |
| assertThrows(() => array.slice(tmp, tmp), TypeError); |
| |
| // Check that the species array must be a typed array |
| class MyTypedArray extends constructor { |
| static get[Symbol.species]() { |
| return Array; |
| } |
| } |
| var arr = new MyTypedArray([-1.0, 0, 1.1, 255, 256]); |
| assertThrows(() => arr.slice(), TypeError); |
| } |
| |
| // Check that the result array is properly created by checking species |
| for (var constructor1 of typedArrayConstructors) { |
| for (var constructor2 of typedArrayConstructors) { |
| testCustomSubclass(constructor1, constructor2); |
| testSpeciesConstructor(constructor1, constructor2); |
| } |
| } |
| |
| function testSpeciesConstructor(cons1, cons2) { |
| var ta = new cons1([1, 2, 3, 4, 5, 6]); |
| ta.constructor = { |
| [Symbol.species]: cons2 |
| }; |
| assertArrayEquals([4, 5, 6], ta.slice(3)); |
| } |
| |
| function testCustomSubclass(superClass, speciesClass) { |
| // Simple subclass that has another TypedArray as species |
| class CustomTypedArray extends superClass { |
| static get[Symbol.species]() { |
| return speciesClass; |
| } |
| } |
| // 16 entries. |
| let exampleArray = [-1.0, 0, 1.1, 255, 256, 0xFFFFFFFF, 2**50, NaN]; |
| let customArray = new CustomTypedArray(exampleArray); |
| let basicArray = new superClass(exampleArray); |
| assertEquals(new speciesClass(basicArray), customArray.slice(), |
| superClass.name + ' -> ' + speciesClass.name); |
| |
| // Custom constructor with shared buffer. |
| exampleArray = new Array(64).fill(0).map((v,i) => i); |
| let filledBuffer = new Uint8Array(exampleArray).buffer; |
| // Create a view for the beginning of the buffer. |
| let customArray2 = new superClass(filledBuffer, 0, 3); |
| customArray2.constructor = { |
| [Symbol.species]: function(length) { |
| let bytes_per_element = speciesClass.BYTES_PER_ELEMENT; |
| // Reuse the same buffer for the custom species constructor. |
| // Skip the first BYTES_PER_ELEMENT bytes of the buffer. |
| return new speciesClass(filledBuffer, bytes_per_element, length); |
| } |
| }; |
| // Since slice is defined iteratively, the species created new array uses the |
| // same underlying buffer shifted by one element. Hence the first value is |
| // copied over and over again. |
| let convertedCopy = Array.from(customArray2); |
| let firstValue = convertedCopy[0]; |
| assertEquals(firstValue, customArray2[0]); |
| let sliceResult = customArray2.slice(); |
| if (superClass == speciesClass) { |
| assertEquals(new Array(3).fill(firstValue), Array.from(customArray2)); |
| assertEquals(new Array(3).fill(firstValue), Array.from(sliceResult)); |
| } |
| assertEquals(3, customArray2.length); |
| assertEquals(3, sliceResult.length); |
| } |