// 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 detached."); return 0; } }; var array = new constructor([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]); %ArrayBufferDetach(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); }