feat: add shift left and shift right

dopey.py

@@ -1,30 +1,61 @@
 import sys
 
-# create memory buffer
-BUFFER_SIZE = 30_000
-buffer = [0 for _ in range(BUFFER_SIZE)]
+# 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
-SHIFT_LEFT = "<"
-SHIFT_RIGHT = ">"
-INCREMENT = "+"
-DECREMENT = "-"
-OUTPUT = "."
-INPUT = ","
-OPEN_LOOP = "["
-CLOSE_LOOP = "]"
+class Operation:
+    SHIFT_LEFT = "<"
+    SHIFT_RIGHT = ">"
+    INCREMENT = "+"
+    DECREMENT = "-"
+    OUTPUT = "."
+    INPUT = ","
+    OPEN_LOOP = "["
+    CLOSE_LOOP = "]"
 
-# get bf file location
-file_location = None
-if len(sys.argv) != 2:
-    print("Invalid or missing arguments...")
-    sys.exit()
-else:
-    file_location = sys.argv[1]
+def main() -> None:
+    # get bf file location
+    file_location = None
+    if len(sys.argv) != 2:
+        print("Invalid or missing arguments...")
+        sys.exit()
+    else:
+        file_location = sys.argv[1]
 
-# open file
-file = open(file_location, "r")
-print(file.read(1))
+    # open file
+    file = open(file_location, "r")
+    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()