Add initial implementation of RobotLang interpreter and visitor pattern

Q1/Artefacts/main.py

@@ -0,0 +1,31 @@
+import sys
+from antlr4 import *
+from RobotLangLexer import RobotLangLexer
+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[9]
+        inpstream = FileStream(inpname)
+    # 1. Lexer analyses the characters
+    lexer = RobotLangLexer(inpstream)
+    # 2. Create a stream of tokens
+    tokstream = CommonTokenStream(lexer)
+    # 3. Parser produces the abstract syntax tree
+    parser = RobotLangParser(tokstream)
+    # 4. Start parsing from the top rule ('prog' in your grammar)
+    tree = parser.prog()
+
+    # Printing the parse tree using Marina's PrettyPrint and toStringTree methods (Not-needed for the assignment)
+    # print(TreesUser.toStringTree(tree, None, parser))
+    # print(TreesUser.PrettyPrint(tree, None, parser))
+
+    visitor = RobotLangVisitorUser("2320390")
+    visitor.visit(tree)
+
+if __name__ == '__main__':
+    main(sys.argv)