98 lines
3 KiB
JavaScript
98 lines
3 KiB
JavaScript
'use strict';
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var $RangeError = require('es-errors/range');
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var $TypeError = require('es-errors/type');
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var isTypedArray = require('is-typed-array');
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var typedArrayBuffer = require('typed-array-buffer');
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var typedArrayByteOffset = require('typed-array-byte-offset');
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var typedArrayLength = require('typed-array-length');
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var whichTypedArray = require('which-typed-array');
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var isInteger = require('../helpers/isInteger');
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var Get = require('./Get');
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var IsBigIntElementType = require('./IsBigIntElementType');
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var IsDetachedBuffer = require('./IsDetachedBuffer');
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var LengthOfArrayLike = require('./LengthOfArrayLike');
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var SetValueInBuffer = require('./SetValueInBuffer');
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var ToBigInt = require('./ToBigInt');
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var ToNumber = require('./ToNumber');
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var ToObject = require('./ToObject');
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var ToString = require('./ToString');
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var tableTAO = require('./tables/typed-array-objects');
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// https://262.ecma-international.org/12.0/#sec-settypedarrayfromarraylike
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module.exports = function SetTypedArrayFromArrayLike(target, targetOffset, source) {
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var whichTarget = whichTypedArray(target);
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if (!whichTarget) {
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throw new $TypeError('Assertion failed: target must be a TypedArray instance');
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}
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if (targetOffset !== Infinity && (!isInteger(targetOffset) || targetOffset < 0)) {
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throw new $TypeError('Assertion failed: targetOffset must be a non-negative integer or +Infinity');
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}
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if (isTypedArray(source)) {
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throw new $TypeError('Assertion failed: source must not be a TypedArray instance'); // step 1
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}
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var targetBuffer = typedArrayBuffer(target); // step 2
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if (IsDetachedBuffer(targetBuffer)) {
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throw new $TypeError('target’s buffer is detached'); // step 3
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}
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var targetLength = typedArrayLength(target); // step 4
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var targetName = whichTarget; // step 5
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var targetType = tableTAO.name['$' + targetName]; // step 7
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var targetElementSize = tableTAO.size['$' + targetType]; // step 6
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var targetByteOffset = typedArrayByteOffset(target); // step 8
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var src = ToObject(source); // step 9
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var srcLength = LengthOfArrayLike(src); // step 10
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if (targetOffset === Infinity) {
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throw new $RangeError('targetOffset must be a finite integer'); // step 11
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}
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if (srcLength + targetOffset > targetLength) {
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throw new $RangeError('targetOffset + srcLength must be <= target.length'); // step 12
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}
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var targetByteIndex = (targetOffset * targetElementSize) + targetByteOffset; // step 13
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var k = 0; // step 14
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var limit = targetByteIndex + (targetElementSize * srcLength); // step 15
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while (targetByteIndex < limit) { // step 16
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var Pk = ToString(k); // step 16.a
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var value = Get(src, Pk); // step 16.b
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if (IsBigIntElementType(targetType)) {
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value = ToBigInt(value); // step 16.c
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} else {
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value = ToNumber(value); // step 16.d
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}
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if (IsDetachedBuffer(targetBuffer)) {
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throw new $TypeError('target’s buffer is detached'); // step 16.e
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}
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SetValueInBuffer(targetBuffer, targetByteIndex, targetType, value, true, 'Unordered'); // step 16.f
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k += 1; // step 16.g
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targetByteIndex += targetElementSize; // step 16.h
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}
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};
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