polyfill for TypedArray.fill
This commit is contained in:
Jörg Breitbart
@@ -0,0 +1,157 @@
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/**
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* Copyright (c) 2018 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { assert } from 'chai';
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import { fill } from './TypedArrayUtils';
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type TypedArray = Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray
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| Int8Array | Int16Array | Int32Array
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| Float32Array | Float64Array;
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function loopFill(array: TypedArray, value: number, start: number = 0, end?: number | undefined): TypedArray {
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if (start >= array.length) {
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return array;
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}
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start = (array.length + start) % array.length;
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if (end === undefined) {
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end = array.length;
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}
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if (end >= array.length) {
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end = array.length;
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} else {
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end = (array.length + end) % array.length;
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}
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for (let i = start; i < end; ++i) {
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array[i] = value;
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}
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return array;
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}
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function deepEquals(a: TypedArray, b: TypedArray) {
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assert.equal(a.length, b.length);
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for (let i = 0; i < a.length; ++i) {
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assert.equal(a[i], b[i]);
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}
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}
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describe('polyfill conformance tests', function(): void {
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describe('TypedArray.fill', function(): void {
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it('should work with all typed array types', function(): void {
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const u8_1 = new Uint8Array(5);
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const u8_2 = new Uint8Array(5);
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deepEquals(fill(u8_1, 2), u8_2.fill(2));
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deepEquals(fill(u8_1, -1), u8_2.fill(-1));
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const u16_1 = new Uint16Array(5);
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const u16_2 = new Uint16Array(5);
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deepEquals(fill(u16_1, 2), u16_2.fill(2));
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deepEquals(fill(u16_1, 65535), u16_2.fill(65535));
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deepEquals(fill(u16_1, -1), u16_2.fill(-1));
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const u32_1 = new Uint32Array(5);
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const u32_2 = new Uint32Array(5);
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deepEquals(fill(u32_1, 2), u32_2.fill(2));
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deepEquals(fill(u32_1, 65537), u32_2.fill(65537));
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deepEquals(fill(u32_1, -1), u32_2.fill(-1));
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const i8_1 = new Int8Array(5);
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const i8_2 = new Int8Array(5);
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deepEquals(fill(i8_1, 2), i8_2.fill(2));
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deepEquals(fill(i8_1, -1), i8_2.fill(-1));
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const i16_1 = new Int16Array(5);
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const i16_2 = new Int16Array(5);
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deepEquals(fill(i16_1, 2), i16_2.fill(2));
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deepEquals(fill(i16_1, 65535), i16_2.fill(65535));
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deepEquals(fill(i16_1, -1), i16_2.fill(-1));
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const i32_1 = new Int32Array(5);
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const i32_2 = new Int32Array(5);
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deepEquals(fill(i32_1, 2), i32_2.fill(2));
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deepEquals(fill(i32_1, 65537), i32_2.fill(65537));
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deepEquals(fill(i32_1, -1), i32_2.fill(-1));
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const f32_1 = new Float32Array(5);
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const f32_2 = new Float32Array(5);
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deepEquals(fill(f32_1, 1.2345), f32_2.fill(1.2345));
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const f64_1 = new Float64Array(5);
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const f64_2 = new Float64Array(5);
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deepEquals(fill(f64_1, 1.2345), f64_2.fill(1.2345));
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const u8Clamped_1 = new Uint8ClampedArray(5);
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const u8Clamped_2 = new Uint8ClampedArray(5);
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deepEquals(fill(u8Clamped_1, 2), u8Clamped_2.fill(2));
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deepEquals(fill(u8Clamped_1, 257), u8Clamped_2.fill(257));
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});
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it('should work with all typed array types - explicit looping', function(): void {
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const u8_1 = new Uint8Array(5);
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const u8_2 = new Uint8Array(5);
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deepEquals(loopFill(u8_1, 2), u8_2.fill(2));
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deepEquals(loopFill(u8_1, -1), u8_2.fill(-1));
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const u16_1 = new Uint16Array(5);
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const u16_2 = new Uint16Array(5);
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deepEquals(loopFill(u16_1, 2), u16_2.fill(2));
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deepEquals(loopFill(u16_1, 65535), u16_2.fill(65535));
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deepEquals(loopFill(u16_1, -1), u16_2.fill(-1));
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const u32_1 = new Uint32Array(5);
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const u32_2 = new Uint32Array(5);
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deepEquals(loopFill(u32_1, 2), u32_2.fill(2));
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deepEquals(loopFill(u32_1, 65537), u32_2.fill(65537));
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deepEquals(loopFill(u32_1, -1), u32_2.fill(-1));
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const i8_1 = new Int8Array(5);
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const i8_2 = new Int8Array(5);
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deepEquals(loopFill(i8_1, 2), i8_2.fill(2));
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deepEquals(loopFill(i8_1, -1), i8_2.fill(-1));
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const i16_1 = new Int16Array(5);
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const i16_2 = new Int16Array(5);
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deepEquals(loopFill(i16_1, 2), i16_2.fill(2));
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deepEquals(loopFill(i16_1, 65535), i16_2.fill(65535));
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deepEquals(loopFill(i16_1, -1), i16_2.fill(-1));
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const i32_1 = new Int32Array(5);
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const i32_2 = new Int32Array(5);
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deepEquals(loopFill(i32_1, 2), i32_2.fill(2));
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deepEquals(loopFill(i32_1, 65537), i32_2.fill(65537));
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deepEquals(loopFill(i32_1, -1), i32_2.fill(-1));
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const f32_1 = new Float32Array(5);
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const f32_2 = new Float32Array(5);
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deepEquals(loopFill(f32_1, 1.2345), f32_2.fill(1.2345));
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const f64_1 = new Float64Array(5);
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const f64_2 = new Float64Array(5);
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deepEquals(loopFill(f64_1, 1.2345), f64_2.fill(1.2345));
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const u8Clamped_1 = new Uint8ClampedArray(5);
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const u8Clamped_2 = new Uint8ClampedArray(5);
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deepEquals(loopFill(u8Clamped_1, 2), u8Clamped_2.fill(2));
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deepEquals(loopFill(u8Clamped_1, 257), u8Clamped_2.fill(257));
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});
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it('start offset', function(): void {
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for (let i = -2; i < 10; ++i) {
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const u8_1 = new Uint8Array(5);
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const u8_2 = new Uint8Array(5);
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const u8_3 = new Uint8Array(5);
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deepEquals(fill(u8_1, 2, i), u8_3.fill(2, i));
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deepEquals(fill(u8_1, -1, i), u8_3.fill(-1, i));
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deepEquals(loopFill(u8_2, 2, i), u8_3.fill(2, i));
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deepEquals(loopFill(u8_2, -1, i), u8_3.fill(-1, i));
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}
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});
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it('end offset', function(): void {
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for (let i = -2; i < 10; ++i) {
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const u8_1 = new Uint8Array(5);
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const u8_2 = new Uint8Array(5);
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const u8_3 = new Uint8Array(5);
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deepEquals(fill(u8_1, 2, 0, i), u8_3.fill(2, 0, i));
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deepEquals(fill(u8_1, -1, 0, i), u8_3.fill(-1, 0, i));
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deepEquals(loopFill(u8_2, 2, 0, i), u8_3.fill(2, 0, i));
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deepEquals(loopFill(u8_2, -1, 0, i), u8_3.fill(-1, 0, i));
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}
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});
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it('start/end offset', function(): void {
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for (let i = -2; i < 10; ++i) {
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for (let j = -2; j < 10; ++j) {
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const u8_1 = new Uint8Array(5);
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const u8_2 = new Uint8Array(5);
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const u8_3 = new Uint8Array(5);
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deepEquals(fill(u8_1, 2, i, j), u8_3.fill(2, i, j));
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deepEquals(fill(u8_1, -1, i, j), u8_3.fill(-1, i, j));
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deepEquals(loopFill(u8_2, 2, i, j), u8_3.fill(2, i, j));
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deepEquals(loopFill(u8_2, -1, i, j), u8_3.fill(-1, i, j));
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}
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}
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});
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});
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});
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@@ -0,0 +1,40 @@
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/**
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* Copyright (c) 2018 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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/**
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* polyfill for TypedArray.fill
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* This is needed to support .fill in all safari versions and IE 11.
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*/
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type TypedArray = Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray
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| Int8Array | Int16Array | Int32Array
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| Float32Array | Float64Array;
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export function fill(array: TypedArray, value: number, start: number = 0, end?: number | undefined): TypedArray {
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// all modern engines that support .fill
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if (array.fill) {
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return array.fill(value, start, end);
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}
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// safari and IE 11
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// since IE 11 does not support Array.prototype.fill either
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// we cannot use the suggested polyfill from MDN
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// instead we simply fall back to looping
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if (start >= array.length) {
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return array;
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}
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start = (array.length + start) % array.length;
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if (end === undefined) {
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end = array.length;
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}
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if (end >= array.length) {
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end = array.length;
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} else {
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end = (array.length + end) % array.length;
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}
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for (let i = start; i < end; ++i) {
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array[i] = value;
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}
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return array;
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}
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