Go wild

gistfile1.txt

var applyFn = function(node, fn) {
  var applied = fn(node);
  return applied === undefined ? node : applied;
};

var macro = function(key, val) {
  if (key.firstBit === repeatChild) {
    repeatChild(key, val)
  }
};

var traverse = function(obj, keyFn, valFn) {
  if (isString(obj)) {
    return obj;
  }
  
  var newObj = {};
  for (var key in obj) {
    var newKey = applyFn(key, fn);
    var newVal = simple(newKey) ?
      traverse(applyFn(obj[key], fn)) :
      macro(key, obj[key]);
    newObj[newKey] = newVal;
  }
  return newObj;
};


var jsonGenerator = {};
var generatedJson = traverse(jsonGenerator, function(x) {
  return x;
});

var jsonGenerator = { {}: { b:{} } };
var generatedJson = traverse(jsonGenerator, function(x) {
  return x;
});