在 ANTLR 规则中返回多个值

问题描述

我有一个这样的 ANTLR 规则

I have an ANTLR rule like this

receive returns[Evaluator e,String message]
  : RECEIVE FILENAME {$e= new ReceiveEvaluator($FILENAME.text);}
  ;

我添加了一条新的返回消息，我想将文件内容放入其中.我可以做的一种方法是在我通过调用evaluate() 方法遍历树时让求值器返回字符串.

I have added a new return message and I want to put the file content in that. One way I could do is make the evaluator return the String when I walk the tree by calling the evaluate() method.

我想知道我是否可以在这里直接完成 - 但我不知道如何设置多个返回值并在以后访问它们.

I was wondering if I could do it strightaway here - but am not aware how to set multiple return values and access them later.

谢谢哈里

推荐答案

以下是设置和使用多个返回值的方法:

Here's how to set- and use multiple return values:

parse
  :  r=receive {
       Evaluator e = $r.evaluator;
       String m = $r.message;
     }
  ;

receive returns[Evaluator evaluator, String message]
  :  RECEIVE f=FILENAME {
       $evaluator = new ReceiveEvaluator($f.text);
       $message = "Some message here...";
     }
  ;

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