Add ANTLR grammar for greetings and farewells with corresponding parser and listener implementations

HelloListener.py

@@ -8,6 +8,33 @@ else:
 # This class defines a complete listener for a parse tree produced by HelloParser.
 class HelloListener(ParseTreeListener):
 
+    # Enter a parse tree produced by HelloParser#greeting.
+    def enterGreeting(self, ctx:HelloParser.GreetingContext):
+        pass
+
+    # Exit a parse tree produced by HelloParser#greeting.
+    def exitGreeting(self, ctx:HelloParser.GreetingContext):
+        pass
+
+
+    # Enter a parse tree produced by HelloParser#leaving.
+    def enterLeaving(self, ctx:HelloParser.LeavingContext):
+        pass
+
+    # Exit a parse tree produced by HelloParser#leaving.
+    def exitLeaving(self, ctx:HelloParser.LeavingContext):
+        pass
+
+
+    # Enter a parse tree produced by HelloParser#greet.
+    def enterGreet(self, ctx:HelloParser.GreetContext):
+        pass
+
+    # Exit a parse tree produced by HelloParser#greet.
+    def exitGreet(self, ctx:HelloParser.GreetContext):
+        pass
+
+
     # Enter a parse tree produced by HelloParser#start.
     def enterStart(self, ctx:HelloParser.StartContext):
         pass
@@ -17,5 +44,14 @@ class HelloListener(ParseTreeListener):
         pass
 
 
+    # Enter a parse tree produced by HelloParser#bye.
+    def enterBye(self, ctx:HelloParser.ByeContext):
+        pass
+
+    # Exit a parse tree produced by HelloParser#bye.
+    def exitBye(self, ctx:HelloParser.ByeContext):
+        pass
+
+
 
 del HelloParser