code: private Object parseItem(Object item) {
          // 处理参数个数
          if (methods.peek() != null) {
              MethodOpt opt = methods.peek();
              if (opt.getSize() <= 0) {
                  if (!(item instanceof CommaOpt) && !(item instanceof RBracketOpt)) {
                      opt.setSize(1);
                  }
              } else {
                  if (item instanceof CommaOpt) {
                      opt.setSize(opt.getSize() + 1);
                  }
              }
          }
  
          // 左括号
          if (item instanceof LBracketOpt) {
              if (prev instanceof Elobj) {
                  MethodOpt prem = new MethodOpt();
                  item = new Object[]{prem, new LBracketOpt()};
                  methods.addFirst(prem);
              } else {
                  methods.addFirst(null);
              }
          }
  
          // 右括号
          if (item instanceof RBracketOpt) {
              if (methods.poll() != null) {
                  item = new Object[]{new RBracketOpt(), new InvokeMethodOpt()};
              }
          }
          // 转换负号'-'
          if (item instanceof SubOpt && NegativeOpt.isNegetive(prev)) {
              item = new NegativeOpt();
          }
          prev = item;
          return item;
      }
docs: 转换数据,主要是转换负号,方法执行