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39 lines
1.2 KiB
39 lines
1.2 KiB
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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var GetValueFromBuffer = require('./GetValueFromBuffer'); |
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var IsValidIntegerIndex = require('./IsValidIntegerIndex'); |
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var typedArrayBuffer = require('typed-array-buffer'); |
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var typedArrayByteOffset = require('typed-array-byte-offset'); |
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var whichTypedArray = require('which-typed-array'); |
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var tableTAO = require('./tables/typed-array-objects'); |
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// https://262.ecma-international.org/12.0/#sec-integerindexedelementget |
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module.exports = function IntegerIndexedElementGet(O, index) { |
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var arrayTypeName = whichTypedArray(O); // step 4 |
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if (!arrayTypeName) { |
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throw new $TypeError('Assertion failed: `O` must be a TypedArray'); // step 1 |
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} |
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if (typeof index !== 'number') { |
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throw new $TypeError('Assertion failed: `index` must be a Number'); |
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} |
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if (!IsValidIntegerIndex(O, index)) { |
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return void undefined; // step 2 |
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} |
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var offset = typedArrayByteOffset(O); // step 3 |
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var elementType = tableTAO.name['$' + arrayTypeName]; // step 7 |
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var elementSize = tableTAO.size['$' + elementType]; // step 5 |
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var indexedPosition = (index * elementSize) + offset; // step 6 |
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return GetValueFromBuffer(typedArrayBuffer(O), indexedPosition, elementType, true, 'Unordered'); // step 11 |
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};
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