Grammar in calculator.g4 can not be easily parsed

[sleagon]

expression
   : multiplyingExpression ((PLUS | MINUS) multiplyingExpression)*
   ;

The grammars in Calculator.g4 can not be easily parsed unless modifying it to this:

expression
   : multiplyingExpression (plusMinus multiplyingExpression)*
   ;
plusMinus: PLUS | MINUS;

Here is a simple example, I have searched over google and post a question in stackoverflow, but it seems like that adding a extra rule definition is the best choice.

[KvanTTT]

I don't think it's a problem, the rewritten rule doesn't simplify grammar. Also, you can use Rule Element Labels to archive the same goal:

 expression
   : multiplyingExpression (operator+=(PLUS | MINUS) multiplyingExpression)*
   ;

[sleagon]

I don't think it's a problem, the rewritten rule doesn't simplify grammar. Also, you can use Rule Element Labels to archive the same goal:

 expression
   : multiplyingExpression (operator+=(PLUS | MINUS) multiplyingExpression)*
   ;

Of cause we can use Rule Element Labels o arrchive the same goal. What I want to say is that we should replace them with another plusMinus rule or another label as you mentioned upside, both of them are better than the original one.

[sleagon]

The original grammar definition is quite confusing especially for the beginnerrs who just finished reading cookbook somewhere and want to do some practice using "official" cases here.