Add TreesUser class for improved tree representation and update grammar rules

Q1/Artefacts/main.py

@@ -5,21 +5,19 @@ from RobotLangParser import RobotLangParser
 from RobotLangVisitorUser import RobotLangVisitorUser
 
 def main(argv):
-    # Determine if reading from a file or standard input
     if len(argv) == 1:
         inpstream = StdinStream()
     else:
         inpname = argv[1]
         inpstream = FileStream(inpname)
-    # Lexer analyses the characters
     lexer = RobotLangLexer(inpstream)
-    # Create a stream of tokens
+    #Create a stream of tokens
     tokstream = CommonTokenStream(lexer)
-    # Parser produces the abstract syntax tree
+    #Parser produces the abstract syntax tree
     parser = RobotLangParser(tokstream)
-    # Start parsing from the top rule
+    #Start parsing from the top rule
     tree = parser.prog()
-
+    #execute script
     visitor = RobotLangVisitorUser()
     visitor.visit(tree)