Fixed #20: I can parse simple concepts

src/parsers/ParserInput.py

@@ -75,7 +75,7 @@ class ParserInput:
                     return self.all_tokens[-1]
 
         return self.all_tokens[my_pos]
-    
+
     def seek(self, pos):
         """
         Move the token offset to position pos
@@ -90,5 +90,15 @@ class ParserInput:
         self.token = self.all_tokens[self.pos]
         return True
 
+    def clone(self):
+        res = ParserInput(self.original_text)
+        res.all_tokens = self.all_tokens
+        res.exception = self.exception
+        res.pos = self.pos
+        res.end = self.end
+        res.token = self.token
+
+        return res
+
     def __repr__(self):
         return f"ParserInput('{self.original_text}', len={len(self.all_tokens)})"