44 lines
1.4 KiB
Plaintext
44 lines
1.4 KiB
Plaintext
'use strict';
|
|
|
|
var $TypeError = require('es-errors/type');
|
|
|
|
var IsDetachedBuffer = require('./IsDetachedBuffer');
|
|
var IsTypedArrayOutOfBounds = require('./IsTypedArrayOutOfBounds');
|
|
var MakeTypedArrayWithBufferWitnessRecord = require('./MakeTypedArrayWithBufferWitnessRecord');
|
|
var TypedArrayLength = require('./TypedArrayLength');
|
|
|
|
var isInteger = require('math-intrinsics/isInteger');
|
|
var isNegativeZero = require('math-intrinsics/isNegativeZero');
|
|
|
|
var isTypedArray = require('is-typed-array');
|
|
var typedArrayBuffer = require('typed-array-buffer');
|
|
|
|
// https://262.ecma-international.org/15.0/#sec-isvalidintegerindex
|
|
|
|
module.exports = function IsValidIntegerIndex(O, index) {
|
|
if (!isTypedArray(O)) {
|
|
throw new $TypeError('Assertion failed: `O` is not a TypedArray object');
|
|
}
|
|
if (typeof index !== 'number') {
|
|
throw new $TypeError('Assertion failed: `index` is not a Number');
|
|
}
|
|
|
|
var buffer = typedArrayBuffer(O);
|
|
|
|
if (IsDetachedBuffer(buffer)) { return false; } // step 1
|
|
|
|
if (!isInteger(index)) { return false; } // step 2
|
|
|
|
if (isNegativeZero(index)) { return false; } // step 3
|
|
|
|
var taRecord = MakeTypedArrayWithBufferWitnessRecord(O, 'UNORDERED'); // step 4
|
|
if (IsTypedArrayOutOfBounds(taRecord)) {
|
|
return false; // step 6
|
|
}
|
|
var length = TypedArrayLength(taRecord); // step 7
|
|
|
|
if (index < 0 || index >= length) { return false; } // step 8
|
|
|
|
return true; // step 9
|
|
};
|