SOURCE CODE: Uize.Parse.JavaProperties.UnicodeEscaped (view docs)

/*______________
|       ______  |   U I Z E    J A V A S C R I P T    F R A M E W O R K
|     /      /  |   ---------------------------------------------------
|    /    O /   |    MODULE : Uize.Parse.JavaProperties.UnicodeEscaped Package
|   /    / /    |
|  /    / /  /| |    ONLINE : http://www.uize.com
| /____/ /__/_| | COPYRIGHT : (c)2014-2016 UIZE
|          /___ |   LICENSE : Available under MIT License or GNU General Public License
|_______________|             http://www.uize.com/license.html
*/

/* Module Meta Data
  type: Package
  importance: 1
  codeCompleteness: 100
  docCompleteness: 10
*/

/*?
  Introduction
    The =Uize.Parse.JavaProperties.UnicodeEscaped= module provides methods for converting to and from Java Unicode-escaped strings.

    *DEVELOPERS:* `Chris van Rensburg`
*/

Uize.module ({
  name:'Uize.Parse.JavaProperties.UnicodeEscaped',
  builder:function () {
    'use strict';

    var
      /*** General Variables ***/
        _leadingZeros = '000000',
        _sacredEmptyObject = {}
    ;

    return Uize.package ({
      from:function (_toUnescape) {
        return (_toUnescape + '').replace (
          /\\u([0-9a-fA-F]{4})/g,
          function (_match,_hexDigits) {
            return String.fromCharCode (+('0x' + _hexDigits));
          }
        );
        /*?
          Static Methods
            Uize.Parse.JavaProperties.UnicodeEscaped.from
              Returns an unescaped version of the specified Unicode-escaped string.

              SYNTAX
              .................................................................................
              unescapedSTR = Uize.Parse.JavaProperties.UnicodeEscaped.from (unicodeEscapedSTR);
              .................................................................................

              NOTES
              - see the companion =Uize.Parse.JavaProperties.UnicodeEscaped.to= static method
        */
      },

      to:function (_toEscape,_encodingOptions) {
        _encodingOptions || (_encodingOptions = _sacredEmptyObject);
        var
          _escapingThreshold = Uize.toNumber (_encodingOptions.escapingThreshold,256),
          _chunks = []
        ;
        for (
          var
            _charNo = -1,
            _toEscapeLength = (_toEscape += '').length,
            _chunksLength = 0,
            _lastUnicodeCharPos = -1,
            _charCode
          ;
          ++_charNo <= _toEscapeLength;
        ) {
          if (_charNo == _toEscapeLength || (_charCode = _toEscape.charCodeAt (_charNo)) >= _escapingThreshold) {
            _chunks [_chunksLength++] = _toEscape.slice (_lastUnicodeCharPos + 1,_charNo);
            _lastUnicodeCharPos = _charNo;
            if (_charNo < _toEscapeLength) {
              var _hexValue = _charCode.toString (16).toUpperCase ();
              _chunks [_chunksLength++] =
                '\\u' + _leadingZeros.slice (0,Math.max (4 - _hexValue.length,0)) + _hexValue
              ;
            }
          }
        }
        return _chunks.join ('');
        /*?
          Static Methods
            Uize.Parse.JavaProperties.UnicodeEscaped.from
              Returnsa a Unicode-escaped version of the specified unescaped string.

              SYNTAX
              ...............................................................................
              unicodeEscapedSTR = Uize.Parse.JavaProperties.UnicodeEscaped.to (unescapedSTR);
              ...............................................................................

              NOTES
              - see the companion =Uize.Parse.JavaProperties.UnicodeEscaped.from= static method
        */
      }
    });
  }
});