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27 lines
839 B
27 lines
839 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 callBound = require('call-bind/callBound'); |
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var $charCodeAt = callBound('String.prototype.charCodeAt'); |
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var $numberToString = callBound('Number.prototype.toString'); |
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var $toLowerCase = callBound('String.prototype.toLowerCase'); |
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var StringPad = require('./StringPad'); |
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// https://262.ecma-international.org/11.0/#sec-unicodeescape |
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module.exports = function UnicodeEscape(C) { |
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if (typeof C !== 'string' || C.length !== 1) { |
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throw new $TypeError('Assertion failed: `C` must be a single code unit'); |
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} |
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var n = $charCodeAt(C, 0); |
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if (n > 0xFFFF) { |
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throw new $TypeError('`Assertion failed: numeric value of `C` must be <= 0xFFFF'); |
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} |
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return '\\u' + StringPad($toLowerCase($numberToString(n, 16)), 4, '0', 'start'); |
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};
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