twitst4tz

twitter statistics web application
Log | Files | Refs | README | LICENSE

ucs2length.js (558B)

      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 };