Merge pull request #3239 from plotly/fix/stringcase

Remove stringcase

Author: T4rk1n

CHANGELOG.md

@@ -2,6 +2,12 @@
 All notable changes to `dash` will be documented in this file.
 This project adheres to [Semantic Versioning](https://semver.org/).
 
+## [UNRELEASED]
+
+## Fixed
+
+- [#3239](https://github.com/plotly/dash/pull/3239) Remove stringcase dependency, fix [#3238](https://github.com/plotly/dash/issues/3238)
+
 ## [3.0.0] - 2025-03-17
 
 ## Added

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: Union[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

@@ -4,7 +4,7 @@
 import textwrap
 import importlib
 
-import stringcase
+from .._utils import pascal_case
 
 
 shapes = {}
@@ -54,7 +54,7 @@ def generate_any(*_):
 
 def generate_shape(type_info, component_name: str, prop_name: str):
     props = []
-    name = stringcase.pascalcase(prop_name)
+    name = pascal_case(prop_name)
 
     for prop_key, prop_type in type_info["value"].items():
         typed = get_prop_typing(

dash/py.typed

@@ -0,0 +1 @@
+partial

requirements/install.txt

@@ -7,4 +7,3 @@ requests
 retrying
 nest-asyncio
 setuptools
-stringcase>=1.2.0

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