Vendor stringcase library (#1727)

- fixes #1655 

Commits:
- Vendor `stringcase` library
- Fix deprecation warning in it
- Swap so it is used, remove dependency on actual library

---------

Co-authored-by: Pierre Camilleri <[email protected]>

Author: LincolnPuzey

frictionless/helpers/general.py

@@ -17,7 +17,7 @@
 from typing import Any, Dict, Iterator, List, Optional, Tuple, Type, TypeVar, Union
 from urllib.parse import parse_qs, urlparse
 
-import stringcase  # type: ignore
+from ..vendors import stringcase
 
 # General
 

frictionless/metadata/metadata.py

@@ -21,12 +21,12 @@
     Union,
 )
 
-import stringcase  # type: ignore
 from typing_extensions import Self
 
 from .. import helpers
 from ..exception import FrictionlessException
 from ..platform import platform
+from ..vendors import stringcase
 
 if TYPE_CHECKING:
     from .. import types
@@ -136,7 +136,10 @@ def set_not_defined(self, name: str, value: Any, *, distinct: bool = False) -> N
 
     @classmethod
     def validate_descriptor(
-        cls, descriptor: Union[types.IDescriptor, str], *, basepath: Optional[str] = None
+        cls,
+        descriptor: Union[types.IDescriptor, str],
+        *,
+        basepath: Optional[str] = None,
     ) -> Report:
         errors = []
         timer = helpers.Timer()
@@ -391,7 +394,11 @@ def metadata_validate(
 
     @classmethod
     def metadata_import(
-        cls, descriptor: types.IDescriptor, *, with_basepath: bool = False, **options: Any
+        cls,
+        descriptor: types.IDescriptor,
+        *,
+        with_basepath: bool = False,
+        **options: Any,
     ) -> Self:
         merged_options = {}
         profile = cls.metadata_ensure_profile()

frictionless/vendors/stringcase.py

@@ -0,0 +1,101 @@
+"""
+String convert functions
+
+The MIT License (MIT)
+
+Copyright (c) 2015 Taka Okunishi
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+"""
+
+# The "stringcase" package appears to unmaintained
+# https://github.com/okunishinishi/python-stringcase/issues/42
+# Relevant parts have been vendored here so we can fix warnings
+# that will eventually become errors
+# Code here was copied from the 1.2.0 version uploaded to PyPI
+# https://pypi.org/project/stringcase/1.2.0/
+
+import re
+
+
+def camelcase(string: str):
+    """Convert string into camel case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Camel case string.
+
+    """
+
+    string = re.sub(r"\w[\s\W]+\w", "", str(string))
+    if not string:
+        return string
+    return lowercase(string[0]) + re.sub(
+        r"[\-_\.\s]([a-z])", lambda matched: uppercase(matched.group(1)), string[1:]
+    )
+
+
+def lowercase(string: str):
+    """Convert string into lower case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Lowercase case string.
+
+    """
+
+    return str(string).lower()
+
+
+def snakecase(string: str):
+    """Convert string into snake case.
+    Join punctuation with underscore
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Snake cased string.
+
+    """
+
+    string = re.sub(r"[\-\.\s]", "_", str(string))
+    if not string:
+        return string
+    return lowercase(string[0]) + re.sub(
+        r"[A-Z]", lambda matched: "_" + lowercase(matched.group(0)), string[1:]
+    )
+
+
+def uppercase(string: str):
+    """Convert string into upper case.
+
+    Args:
+        string: String to convert.
+
+    Returns:
+        string: Uppercase case string.
+
+    """
+
+    return str(string).upper()

pyproject.toml

@@ -48,7 +48,6 @@ dependencies = [
     "tabulate>=0.8.10",
     "jsonschema>=4.20",
     "simpleeval>=0.9.11",
-    "stringcase>=1.2",
     "typer>=0.12",
     "validators>=0.18",
     "python-slugify>=1.2",