java - ANTLR4 controlling current node execution -


i'm building java ruby source code translator, i'm using listeners, far have extended baselistener, i'm using java.g4 , i'm trying output "else" after if, has matched right, i've got this:

@override public void enterstatement(javaparser.statementcontext ctx) {     ident();     if(ctx.getchild(0).gettext().compareto("if") == 0){         // has else clause         if(ctx.getchildcount() > 3){             // changes java "if( x > 5)" ruby "if x > 5"             system.out.println("if "+ctx.getchild(1).getchild(1).gettext());             // how ho put else after execution of statement?         }         else             system.out.println("if "+ctx.getchild(1).getchild(1).gettext());         }     }

something this: image.png

one way better plan use of enter/exit methods. includes using labeled alternatives create automatically distinguishable contexts.

to implement, change 'statement' rule 

| 'if' parexpression statement ('else' statement)?

to 

| 'if' parexpression statement elsestatement?  # ifstmt

and define new rule

elsestatement: 'else' statement ;

in enterifstmt listener method, print if. no need test if in if statement -- context ensures are. in enterelsestatement method, likewise print else.

use enter , exit methods of parexpression , statement print content, delegating printing of content of elements elements own enter/exit methods.


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