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25 lines
789 B
Plaintext
25 lines
789 B
Plaintext
'use strict';
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var $TypeError = require('es-errors/type');
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var callBound = require('call-bound');
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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 $strSlice = callBound('String.prototype.slice');
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// https://262.ecma-international.org/9.0/#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' + $strSlice('0000' + $toLowerCase($numberToString(n, 16)), -4);
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};
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