1
|
'use strict';
|
2
|
|
3
|
// https://mathiasbynens.be/notes/javascript-encoding
|
4
|
// https://github.com/bestiejs/punycode.js - punycode.ucs2.decode
|
5
|
module.exports = function ucs2length(str) {
|
6
|
var length = 0
|
7
|
, len = str.length
|
8
|
, pos = 0
|
9
|
, value;
|
10
|
while (pos < len) {
|
11
|
length++;
|
12
|
value = str.charCodeAt(pos++);
|
13
|
if (value >= 0xD800 && value <= 0xDBFF && pos < len) {
|
14
|
// high surrogate, and there is a next character
|
15
|
value = str.charCodeAt(pos);
|
16
|
if ((value & 0xFC00) == 0xDC00) pos++; // low surrogate
|
17
|
}
|
18
|
}
|
19
|
return length;
|
20
|
};
|