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