js args

// name, attrs, content, callback
libxml.Element.Arguments = function(args) {
  var ret_args = null;
 
  switch (args.length) {
    case 1:
      ret_args = [args[0], null, null, null];
      break;
 
    case 2: // name, callback; name, attrs; name, content
      if (typeof args[1] == 'function')
        ret_args = [args[0], null, null, args[1]];
      else if (typeof args[1] == 'string')
        ret_args = [args[0], null, args[1], null];
      else
        ret_args = [args[0], args[1], null, null];
      break;
 
    case 3: // name, attrs, content; name, attrs, callback
      if (typeof args[2] == 'function')
        ret_args = [args[0], args[1], null, args[2]];
      else
        ret_args = [args[0], args[1], args[2], null];
      break;
 
    case 4: // name, attrs, content, callback
      ret_args = [args[0], args[1], args[2], args[3]];
  }
 
  return ret_args;
};