Make to_camelcase cacheable.

pyplumio/devices/__init__.py

@@ -37,7 +37,12 @@ def get_device_handler(device_type: int) -> str:
 
     type_name = to_camelcase(
         DeviceType(device_type).name,
-        overrides={"ecomax": "EcoMAX", "ecoster": "EcoSTER"},
+        overrides=frozenset(
+            (
+                ("ecomax", "EcoMAX"),
+                ("ecoster", "EcoSTER"),
+            )
+        ),
     )
     return f"devices.{type_name.lower()}.{type_name}"
 

pyplumio/frames/__init__.py

@@ -51,7 +51,10 @@ def get_frame_handler(frame_type: int) -> str:
         raise UnknownFrameError(f"Unknown frame type ({frame_type})")
 
     module, type_name = FrameType(frame_type).name.split("_", 1)
-    type_name = to_camelcase(type_name, overrides={"uid": "UID"})
+    type_name = to_camelcase(
+        type_name,
+        overrides=frozenset((("uid", "UID"),)),
+    )
     return f"frames.{module.lower()}s.{type_name}{module.capitalize()}"
 
 

pyplumio/utils.py

@@ -2,16 +2,21 @@
 
 from __future__ import annotations
 
+from functools import cache
 from typing import Any
 
 
-def to_camelcase(text: str, overrides: dict[str, str] | None = None) -> str:
+@cache
+def to_camelcase(text: str, overrides: frozenset[tuple[str, str]] | None = None) -> str:
     """Convert snake_case to CamelCase."""
     if overrides is None:
         return "".join((x.capitalize() or "_") for x in text.split("_"))
 
+    overrides_dict = dict(overrides)
     return "".join(
-        (x.capitalize() or "_") if x.lower() not in overrides else overrides[x.lower()]
+        (x.capitalize() or "_")
+        if x.lower() not in overrides_dict
+        else overrides_dict[x.lower()]
         for x in text.split("_")
     )
 

tests/test_utils.py

@@ -8,7 +8,13 @@ def test_to_camelcase() -> None:
     assert utils.to_camelcase("make_love_not_war") == "MakeLoveNotWar"
     assert (
         utils.to_camelcase(
-            "make_love_not_war", overrides={"love": "LOVE", "not": "not"}
+            "make_love_not_war",
+            overrides=frozenset(
+                (
+                    ("love", "LOVE"),
+                    ("not", "not"),
+                )
+            ),
         )
         == "MakeLOVEnotWar"
     )