unicode.js

define(function(require, exports, module) {
var XRegExp = require('xregexp');
var unicode = module.exports = {};

/*!
* From: (c) 2012 Steven Levithan <http://slevithan.com/>
* MIT License
*/
if (!String.fromCodePoint) {
  /*!
  * ES6 Unicode Shims 0.1
  * (c) 2012 Steven Levithan <http://slevithan.com/>
  * MIT License
  */
  String.fromCodePoint = function() {
    var chars = [], point, offset, units, i;
    for (i = 0; i < arguments.length; ++i) {
      point = arguments[i];
      offset = point - 0x10000;
      units = point > 0xFFFF ? 
        [0xD800 + (offset >> 10), 0xDC00 + (offset & 0x3FF)] : 
        [point];
      chars.push(String.fromCharCode.apply(null, units));
    }
    return chars.join("");
  };
}
unicode.fromCodePoint = String.fromCodePoint;


unicode.isLetter = function(char) {
  return XRegExp("^\\p{L}$").test(char);
};

unicode.isSurrogateCode = function(codePoint) {
  return (0xD800 <= codePoint && codePoint <= 0xDBFF) ||
    (0xDC00 <= codePoint && codePoint <= 0xDFFF)
}

return unicode;
});