how to use antlr4 visitor

Question

I am a beginner of antlr. I was trying to use visitor in my code and following the instruction on the net. However, I found out that the visitor was not entering the method

Answer 1

You have to call super if you want ANTLR4 to visit children. Like this:

@Override 
public Integer visitPgm_body(@NotNull MicroParser.Pgm_bodyContext ctx){
    super.visitPgm_body(ctx);
    System.out.println(ctx.getText());
    return 467;
}

@Override
public Integer visitProgram(@NotNull MicroParser.ProgramContext ctx){
    super.visitProgram(ctx);
    System.out.println("11");
    return 456;
}

You have to think about where to put your logic: before super or after.