SOURCE CODE: Uize.Parse.MacStrings.String (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.MacStrings.String Class
|   /    / /    |
|  /    / /  /| |    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: Class
  importance: 1
  codeCompleteness: 100
  docCompleteness: 2
*/

/*?
  Introduction
    The =Uize.Parse.MacStrings.String= module provides methods for parsing and serializing strings in [[https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/LoadingResources/Strings/Strings.html][Mac OS / iOS Strings Files]].

    *DEVELOPERS:* `Chris van Rensburg`
*/

Uize.module ({
  name:'Uize.Parse.MacStrings.String',
  superclass:'Uize.Parse.Base',
  required:[
    'Uize.Str.Whitespace',
    'Uize.Parse.Code.StringLiteral'
  ],
  builder:function (_superclass) {
    'use strict';

    var
      /*** Variables for Scruncher Optimization ***/
        _StringKeyOrValue = Uize.Parse.Code.StringLiteral,

      /*** Variables for Performance Optimization ***/
        _indexOfNonWhitespace = Uize.Str.Whitespace.indexOfNonWhitespace
    ;

    return _superclass.subclass ({
      constructor:function () {
        var m = this;
        m.stringKey = new _StringKeyOrValue;
        m.stringValue = new _StringKeyOrValue;
        _superclass.apply (m,arguments);
      },

      instanceMethods:{
        parse:function (_source,_index) {
          function _eatWhitespace () {
            _index = (_indexOfNonWhitespace (_source,_index) + 1 || _sourceLength + 1) - 1;
          }
          var
            m = this,
            _sourceLength = (m.source = _source).length
          ;
          m.isValid = false;
          m.index = _index || (_index = 0);
          m.length = 0;
          m.stringKey.parse (_source,_index);
          if (m.stringKey.isValid) {
            _index += m.stringKey.length;
            _eatWhitespace ();
            if (_source.charAt (_index) == '=') {
              _index++;
              _eatWhitespace ();
              m.stringValue.parse (_source,_index);
              if (m.stringValue.isValid) {
                _index += m.stringValue.length;
                _eatWhitespace ();
                if (_source.charAt (_index) == ';') {
                  _index++;
                  m.length = _index - m.index;
                  m.isValid = true;
                }
              }
            }
          }
        },

        serialize:function () {
          return this.isValid ? this.stringKey.serialize () + ' = ' + this.stringValue.serialize () + ';' : '';
        }
      }
    });
  }
});