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25 lines
713 B
25 lines
713 B
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $TypeError = GetIntrinsic('%TypeError%'); |
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var $fromCharCode = GetIntrinsic('%String.fromCharCode%'); |
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var floor = require('./floor'); |
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var modulo = require('./modulo'); |
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var isCodePoint = require('../helpers/isCodePoint'); |
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// https://ecma-international.org/ecma-262/12.0/#sec-utf16encoding |
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module.exports = function UTF16EncodeCodePoint(cp) { |
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if (!isCodePoint(cp)) { |
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throw new $TypeError('Assertion failed: `cp` must be >= 0 and <= 0x10FFFF'); |
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} |
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if (cp <= 65535) { |
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return $fromCharCode(cp); |
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} |
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var cu1 = $fromCharCode(floor((cp - 65536) / 1024) + 0xD800); |
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var cu2 = $fromCharCode(modulo(cp - 65536, 1024) + 0xDC00); |
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return cu1 + cu2; |
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};
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