feat: add shift left and shift right

dopey.py

@@ -1,10 +1,17 @@
 import sys
 
-# create memory buffer
+# create memory buffer and pointer
+class Memory:
     BUFFER_SIZE = 30_000
     buffer = [0 for _ in range(BUFFER_SIZE)]
+    pointer = 0
+
+    @classmethod
+    def get_pointer(cls) -> int:
+        pass
 
 # define bf commands
+class Operation:
     SHIFT_LEFT = "<"
     SHIFT_RIGHT = ">"
     INCREMENT = "+"
@@ -14,6 +21,7 @@ INPUT = ","
     OPEN_LOOP = "["
     CLOSE_LOOP = "]"
 
+def main() -> None:
     # get bf file location
     file_location = None
     if len(sys.argv) != 2:
@@ -24,7 +32,30 @@ else:
 
     # open file
     file = open(file_location, "r")
-print(file.read(1))
+    while True:
+        operation = file.read(1)
+        if not operation:
+            break
         
+        # perform operation
+        perform_operation(operation)
 
+    file.close()
+
+def perform_operation(operation: str) -> None:
+    if operation == Operation.SHIFT_LEFT:
+        Memory.pointer -= 1
+    elif operation == Operation.SHIFT_RIGHT:
+        Memory.pointer += 1
+    elif operation == Operation.INCREMENT:
+        pass
+    elif operation == Operation.DECREMENT:
+        pass
+    elif operation == Operation.OUTPUT:
+        pass
+    elif operation == Operation.INPUT:
+        pass
+
+if __name__ == "__main__":
+    main()