code: private int parseDateFormatStyle(Arguments args)
      {
          if (args.has(SHORT_STYLE))
          {
              return DateFormat.SHORT;
          }
          else if (args.has(MEDIUM_STYLE))
          {
              return DateFormat.MEDIUM;
          }
          else if (args.has(LONG_STYLE))
          {
              return DateFormat.LONG;
          }
          else if (args.has(FULL_STYLE))
          {
              return DateFormat.FULL;
          }
          return DateFormat.DEFAULT;
      }
docs: Parses the default style of the {@link DateFormat} from context labels.
  
  @param args The arguments of the macro.
  
  @return The id of the style.