如何使用ANTLR树语法从树解析器中获取信息? [英] How can I get information out of a tree parser using the ANTLR tree grammar syntax?

问题描述

我已经成功构建了一个解析器/词法分析器，该解析器/词法分析器为我的语言创建了AST.是的！！我现在进入解释器"阶段.我用引号说解释器，因为该语言是声明性的，实际上并没有像过程语言那样被执行.它被转换为Java对象，稍后将在我的应用程序运行中使用.

I have successfully built a parser/lexer that creates an AST for my language. Yeah!! I am now onto the "interpreter" stage. I say interpreter in quotes because the language is declarative as isn't really being executed like a procedural language might. It is being translated into Java objects that are used later on in the run of my application.

在进行AST时，我需要将树节点转换为Java对象.这些Java对象在程序中的其他地方使用.我了解如何创建动作来创建Java对象，但是如何将动作结果返回到主程序中?

As I am walking my AST I need to translate the tree nodes into Java objects. These Java objects are used else where in my program. I understand how to create actions to cause the Java objects to be created, but how do I get the result of the actions back into my main program?

我是否使用@members {}标记并在其中编写我的getter方法?

Do I use the @members{} tag and write my getter methods in there?

推荐答案

我是否使用@members {}标记并在其中编写我的getter方法?

Do I use the @members{} tag and write my getter methods in there?

是的，这是一个选择.但是，(树)语法规则可以返回您的自定义对象，以便在您调用树浏览器(或解析器)的入口点时，将返回以下自定义对象:

Yes, that is an option. However, (tree) grammar rules can return your custom objects so that when you invoke the entry point of your tree walker (or parser), this custom object is returned:

tree grammar YourTreeWalker;

...

walk returns [CustomObject obj]
 : ... 
   {
     $obj = ...
   }
 ;

...

代码中的其他地方

...
YourTreeWalker walker = new YourTreeWalker(...); 
CustomObject obj = walker.walk();  

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