antlr4使用指南:https://www.cnblogs.com/laud/p/anltrv4_1.html
antlr3语法总结:https://blog.csdn.net/tangtao_xp/article/details/19004995?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-3.nonecase
antlr4入门操作:https://www.jianshu.com/p/21f2afca65e8