stringObj

stringObj.js

(function(exports, undefined) {
  /**
   * create/access objects with a key-string
   * 
   * with eval():                   with stringObj():
   * -----------------------------  ------------------------------
   * var keyString = 'json.data'    var keyString = 'json.data'
   *   , value = 'a value';           , value = 'a value';
   * eval(keyString+' = '+value);   stringObj(keyString, value);
   * alert(eval(keyString));        alert(stringObj(keyString));
   *
   * @param  String keyString (ie. `a.b.c.d`)
   * @param  Mixed  value
   * @return Mixed  value of selected key, or if 2 parameters are passed 
   *                the resulting object will be returned
   */
  var stringObj = exports.stringObj = function(keyString, value) {
    var keys = keyString.split('.'), 
        data = exports[keys[0]] = exports[keys[0]] || {},
        keys = keys.slice(1);        
    if (!value) { // get data
      var value = data;
      for (var i=0, len=keys.length; i<len; i++) {
        if (value === undefined) return false;
        value = value[keys[i]];
      }
      return value;
    } else { // set data
      var temp = data;
      for (var i=0, len=keys.length; i<len; i++) {
        if (i==(len-1)) {
          temp[keys[i]] = value;
        } else {
          temp[keys[i]] = temp[keys[i]] || {};
          temp = temp[keys[i]];
        }
      }
      return data;
    }
  };
})((function() {
  if (typeof exports === 'undefined') {
    return window;
  } else {
    return exports;
  }
})());