CONVERTING ANTLR V3 TO V4

[Siya Mzam]

I am converting from antlr3 to 4. I have stripped out all the syntactic predicates, but now I am struggling finding the equivalent of something like this in antlr4

 relaxed_date_month_first
  : relaxed_day_of_week? relaxed_month COMMA? WHITE_SPACE relaxed_day_of_month (relaxed_year_prefix relaxed_year)?
      -> ^(EXPLICIT_DATE relaxed_day_of_month relaxed_month relaxed_day_of_week? relaxed_year?)

I get an error at input "->" and "^". It says, "{EXPECTING TOKEN_REF, RULE_REF...ACTION}". How can I rewrite that grammar rule to so as to be antlrV4 compliant? 

[Jim Idle]

There are no rewrite rules in v4. You basically write a parser listener and construct your own structure or act directly. 

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[Siya Mzam]

Okay, thanks, so you mean I would write the above as 

 relaxed_date_month_first
  : relaxed_day_of_week? relaxed_month COMMA? WHITE_SPACE relaxed_day_of_month (relaxed_year_prefix relaxed_year)?

and antlr will generate an appropriate listener?

[Jim Idle]

Yes. Though you need to read the book or one of the online tutorials to see what to do. It's not difficult :)

[Siya Mzam]

Okay, Thanks Jim.