utf16.js

   1 if (typeof define !== 'function') { var define = require('amdefine')(module) }
   2
   3 define(function(require) {
   4
   5 var decode = function(string, points) {
   6     if (typeof points === "undefined")
   7         points = [];
   8
   9     for (var i = 0, e = string.length; i != e; ++i) {
  10         var unit = string.charCodeAt(i);
  11         var part = unit & 0xfc00;
  12         if (part == 0xdc00)
  13             return null;
  14         else if (part != 0xd800)
  15             points.push(unit);
  16         else if (++i == e)
  17             return null;
  18         else {
  19             var next = string.charCodeAt(i);
  20             if ((next & 0xfc00) != 0xdc00)
  21                 return null;
  22             points.push(0x10000 | (unit & 0x03ff) << 10 | next & 0x03ff);
  23         }
  24     }
  25
  26     return points;
  27 };
  28
  29 var encode = function(points) {
  30     var units = [];
  31     for (var i = 0, e = points.length; i != e; ++i) {
  32         var point = points[i];
  33         if (point < 0x10000)
  34             units.push(point);
  35         else {
  36             point -= 0x10000;
  37             units.push(0xd800 | (0xffc00 & point) >> 10, 0xdc00 | 0x03ff & point);
  38         }
  39     } return String.fromCharCode.apply(String, units);
  40 };
  41
  42 return {
  43     decode: decode,
  44     encode: encode,
  45 };
  46
  47 });