lix-website/themes/lix/assets/bootstrap/node_modules/es-abstract/2022/ValidateAtomicAccess.js
2024-04-26 22:49:34 -06:00

41 lines
1.1 KiB
JavaScript

'use strict';
var $RangeError = require('es-errors/range');
var $TypeError = require('es-errors/type');
var ToIndex = require('./ToIndex');
var TypedArrayElementSize = require('./TypedArrayElementSize');
var isTypedArray = require('is-typed-array');
var typedArrayByteOffset = require('typed-array-byte-offset');
var typedArrayLength = require('typed-array-length');
// https://262.ecma-international.org/13.0/#sec-validateatomicaccess
module.exports = function ValidateAtomicAccess(typedArray, requestIndex) {
if (!isTypedArray(typedArray)) {
throw new $TypeError('Assertion failed: `typedArray` must be a TypedArray');
}
var length = typedArrayLength(typedArray); // step 1
var accessIndex = ToIndex(requestIndex); // step 2
/*
// this assertion can never be reached
if (!(accessIndex >= 0)) {
throw new $TypeError('Assertion failed: accessIndex >= 0'); // step 4
}
*/
if (accessIndex >= length) {
throw new $RangeError('index out of range'); // step 4
}
var elementSize = TypedArrayElementSize(typedArray); // step 5
var offset = typedArrayByteOffset(typedArray); // step 6
return (accessIndex * elementSize) + offset; // step 7
};