66 lines
2.1 KiB
JavaScript
66 lines
2.1 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 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 IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
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var LengthOfArrayLike = require('./LengthOfArrayLike');
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var MakeTypedArrayWithBufferWitnessRecord = require('./MakeTypedArrayWithBufferWitnessRecord');
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var ToObject = require('./ToObject');
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var ToString = require('./ToString');
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var TypedArrayLength = require('./TypedArrayLength');
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var TypedArraySetElement = require('./TypedArraySetElement');
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// https://262.ecma-international.org/15.0/#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 Typed Array');
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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 Typed Array');
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}
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var targetRecord = MakeTypedArrayWithBufferWitnessRecord(target, 'SEQ-CST'); // step 1
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if (IsTypedArrayOutOfBounds(targetRecord)) {
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throw new $TypeError('target is out of bounds'); // step 2
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}
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var targetLength = TypedArrayLength(targetRecord); // step 3
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var src = ToObject(source); // step 4
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var srcLength = LengthOfArrayLike(src); // step 5
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if (targetOffset === Infinity) {
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throw new $RangeError('targetOffset must be a finite integer'); // step 6
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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 7
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}
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var k = 0; // step 8
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while (k < srcLength) { // step 9
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var Pk = ToString(k); // step 9.a
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var value = Get(src, Pk); // step 9.b
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var targetIndex = targetOffset + k; // step 9.c
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TypedArraySetElement(target, targetIndex, value); // step 9.d
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k += 1; // step 9.e
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}
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};
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