blob: 29cf923d81133859f00ae1f39d6247299a4475cb (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
|
'use strict';
var GetIntrinsic = require('../GetIntrinsic');
var $TypeError = GetIntrinsic('%TypeError%');
var callBound = require('../helpers/callBound');
var $charCodeAt = callBound('String.prototype.charCodeAt');
var $numberToString = callBound('Number.prototype.toString');
var $toLowerCase = callBound('String.prototype.toLowerCase');
var StringPad = require('./StringPad');
// https://tc39.es/ecma262/2020/#sec-unicodeescape
module.exports = function UnicodeEscape(C) {
if (typeof C !== 'string' || C.length !== 1) {
throw new $TypeError('Assertion failed: `C` must be a single code unit');
}
var n = $charCodeAt(C, 0);
if (n > 0xFFFF) {
throw new $TypeError('`Assertion failed: numeric value of `C` must be <= 0xFFFF');
}
return '\\u' + StringPad($toLowerCase($numberToString(n, 16)), 4, '0', 'start');
};
|
