// Generated from Hello.g4 by ANTLR 4.4
package grammar;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.tree.ParseTreeListener;
/**
* This interface defines a complete listener for a parse tree produced by
* {@link HelloParser}.
*/
public interface HelloListener extends ParseTreeListener {
/**
* Enter a parse tree produced by {@link HelloParser#r}.
* @param ctx the parse tree
*/
void enterR(@NotNull HelloParser.RContext ctx);
/**
* Exit a parse tree produced by {@link HelloParser#r}.
* @param ctx the parse tree
*/
void exitR(@NotNull HelloParser.RContext ctx);
/**
* Enter a parse tree produced by {@link HelloParser#expr}.
* @param ctx the parse tree
*/
void enterExpr(@NotNull HelloParser.ExprContext ctx);
/**
* Exit a parse tree produced by {@link HelloParser#expr}.
* @param ctx the parse tree
*/
void exitExpr(@NotNull HelloParser.ExprContext ctx);
}