the-forest/client/node_modules/es-abstract/2021/ValidateAtomicAccess.js

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2024-09-17 20:35:18 -04:00
'use strict';
var $RangeError = require('es-errors/range');
var $TypeError = require('es-errors/type');
var ToIndex = require('./ToIndex');
var isTypedArray = require('is-typed-array');
var typedArrayByteOffset = require('typed-array-byte-offset');
var typedArrayLength = require('typed-array-length');
var whichTypedArray = require('which-typed-array');
var tableTAO = require('./tables/typed-array-objects');
// https://262.ecma-international.org/12.0/#sec-validateatomicaccess
module.exports = function ValidateAtomicAccess(typedArray, requestIndex) {
if (!isTypedArray(typedArray)) {
throw new $TypeError('Assertion failed: `typedArray` must be a TypedArray'); // step 1
}
var length = typedArrayLength(typedArray); // step 2
var accessIndex = ToIndex(requestIndex); // step 3
/*
// this assertion can never be reached
if (!(accessIndex >= 0)) {
throw new $TypeError('Assertion failed: accessIndex >= 0'); // step 4
}
*/
if (accessIndex >= length) {
throw new $RangeError('index out of range'); // step 5
}
var arrayTypeName = whichTypedArray(typedArray); // step 6
var taType = tableTAO.name['$' + arrayTypeName];
var elementSize = tableTAO.size['$' + taType]; // step 7
var offset = typedArrayByteOffset(typedArray); // step 8
return (accessIndex * elementSize) + offset; // step 9
};