Improved pascal_case + tests

Author: T4rk1n

dash/_utils.py

@@ -11,6 +11,8 @@
 import secrets
 import string
 import inspect
+import re
+
 from html import escape
 from functools import wraps
 from typing import Union
@@ -302,3 +304,14 @@ def get_caller_name():
             return s.frame.f_locals.get("__name__", "__main__")
 
     return "__main__"
+
+
+def pascal_case(name: str | None):
+    s = re.sub(r"\s", "_", str(name))
+    # Replace leading `_`
+    s = re.sub("^[_]+", "", s)
+    if not s:
+        return s
+    return s[0].upper() + re.sub(
+        r"[\-_\.]+([a-z])", lambda match: match.group(1).upper(), s[1:]
+    )

dash/development/_py_prop_typing.py

@@ -3,7 +3,8 @@
 import string
 import textwrap
 import importlib
-import re
+
+from .._utils import pascal_case
 
 
 shapes = {}
@@ -51,12 +52,6 @@ def generate_any(*_):
     return "typing.Any"
 
 
-def pascal_case(name: str):
-    return name[0].upper() + re.sub(
-        r"[\-_\.\s]([a-z])", lambda match: match.group(1).upper(), name[1:]
-    )
-
-
 def generate_shape(type_info, component_name: str, prop_name: str):
     props = []
     name = pascal_case(prop_name)

tests/unit/library/test_utils.py

@@ -58,3 +58,19 @@ def test_ddut001_attribute_dict():
         a.x = 4
     assert err.value.args == ("Object is final: No new keys may be added.", "x")
     assert "x" not in a
+
+
+@pytest.mark.parametrize(
+    "value,expected",
+    [
+        ("foo_bar", "FooBar"),
+        ("", ""),
+        ("fooBarFoo", "FooBarFoo"),
+        ("foo bar", "FooBar"),
+        ("foo-bar", "FooBar"),
+        ("__private_prop", "PrivateProp"),
+        ("double__middle___triple", "DoubleMiddleTriple"),
+    ],
+)
+def test_ddut002_pascal_case(value, expected):
+    assert utils.pascal_case(value) == expected