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

84 lines
2.5 KiB
JavaScript

'use strict';
var GetIntrinsic = require('get-intrinsic');
var callBound = require('call-bind/callBound');
var $RangeError = require('es-errors/range');
var $SyntaxError = require('es-errors/syntax');
var $TypeError = require('es-errors/type');
var $BigInt = GetIntrinsic('%BigInt%', true);
var hasOwnProperty = require('./HasOwnProperty');
var IsArray = require('./IsArray');
var IsBigIntElementType = require('./IsBigIntElementType');
var IsUnsignedElementType = require('./IsUnsignedElementType');
var bytesAsFloat32 = require('../helpers/bytesAsFloat32');
var bytesAsFloat64 = require('../helpers/bytesAsFloat64');
var bytesAsInteger = require('../helpers/bytesAsInteger');
var every = require('../helpers/every');
var isByteValue = require('../helpers/isByteValue');
var $reverse = callBound('Array.prototype.reverse');
var $slice = callBound('Array.prototype.slice');
var keys = require('object-keys');
// https://262.ecma-international.org/11.0/#table-the-typedarray-constructors
var TypeToSizes = {
__proto__: null,
Int8: 1,
Uint8: 1,
Uint8C: 1,
Int16: 2,
Uint16: 2,
Int32: 4,
Uint32: 4,
BigInt64: 8,
BigUint64: 8,
Float32: 4,
Float64: 8
};
// https://262.ecma-international.org/11.0/#sec-rawbytestonumeric
module.exports = function RawBytesToNumeric(type, rawBytes, isLittleEndian) {
if (!hasOwnProperty(TypeToSizes, type)) {
throw new $TypeError('Assertion failed: `type` must be a TypedArray element type: ' + keys(TypeToSizes));
}
if (!IsArray(rawBytes) || !every(rawBytes, isByteValue)) {
throw new $TypeError('Assertion failed: `rawBytes` must be an Array of bytes');
}
if (typeof isLittleEndian !== 'boolean') {
throw new $TypeError('Assertion failed: `isLittleEndian` must be a Boolean');
}
var elementSize = TypeToSizes[type]; // step 1
if (rawBytes.length !== elementSize) {
// this assertion is not in the spec, but it'd be an editorial error if it were ever violated
throw new $RangeError('Assertion failed: `rawBytes` must have a length of ' + elementSize + ' for type ' + type);
}
var isBigInt = IsBigIntElementType(type);
if (isBigInt && !$BigInt) {
throw new $SyntaxError('this environment does not support BigInts');
}
// eslint-disable-next-line no-param-reassign
rawBytes = $slice(rawBytes, 0, elementSize);
if (!isLittleEndian) {
$reverse(rawBytes); // step 2
}
if (type === 'Float32') { // step 3
return bytesAsFloat32(rawBytes);
}
if (type === 'Float64') { // step 4
return bytesAsFloat64(rawBytes);
}
return bytesAsInteger(rawBytes, elementSize, IsUnsignedElementType(type), isBigInt);
};