I lovingly borrowed some similar pydantic code recently 😄

Show _pascal_to_snake_case

Lines 455 to 477 in dc3b9ea

    
           # TODO @dangotbanned: Add caching strategy? 
        
           def _function_repr(tp: type[Function], /) -> str: 
        
               name = _pascal_to_snake_case(tp.__name__) 
        
               return f"{ns_name}.{name}" if (ns_name := tp._accessor) else name 
        
           def _pascal_to_snake_case(s: str) -> str: 
        
               """Convert a PascalCase, camelCase string to snake_case. 
        
               Adapted from https://github.com/pydantic/pydantic/blob/f7a9b73517afecf25bf898e3b5f591dffe669778/pydantic/alias_generators.py#L43-L62 
        
               """ 
        
               # Handle the sequence of uppercase letters followed by a lowercase letter 
        
               snake = _PATTERN_UPPER_LOWER.sub(_re_repl_snake, s) 
        
               # Insert an underscore between a lowercase letter and an uppercase letter 
        
               return _PATTERN_LOWER_UPPER.sub(_re_repl_snake, snake).lower() 
        
           _PATTERN_UPPER_LOWER = re.compile(r"([A-Z]+)([A-Z][a-z])") 
        
           _PATTERN_LOWER_UPPER = re.compile(r"([a-z])([A-Z])") 
        
           def _re_repl_snake(match: re.Match[str], /) -> str: 
        
               return f"{match.group(1)}_{match.group(2)}"

May be starting point if anyone needs a hint

	# TODO @dangotbanned: Add caching strategy?
	def _function_repr(tp: type[Function], /) -> str:
	name = _pascal_to_snake_case(tp.__name__)
	return f"{ns_name}.{name}" if (ns_name := tp._accessor) else name


	def _pascal_to_snake_case(s: str) -> str:
	"""Convert a PascalCase, camelCase string to snake_case.

	Adapted from https://github.com/pydantic/pydantic/blob/f7a9b73517afecf25bf898e3b5f591dffe669778/pydantic/alias_generators.py#L43-L62
	"""
	# Handle the sequence of uppercase letters followed by a lowercase letter
	snake = _PATTERN_UPPER_LOWER.sub(_re_repl_snake, s)
	# Insert an underscore between a lowercase letter and an uppercase letter
	return _PATTERN_LOWER_UPPER.sub(_re_repl_snake, snake).lower()


	_PATTERN_UPPER_LOWER = re.compile(r"([A-Z]+)([A-Z][a-z])")
	_PATTERN_LOWER_UPPER = re.compile(r"([a-z])([A-Z])")


	def _re_repl_snake(match: re.Match[str], /) -> str:
	return f"{match.group(1)}_{match.group(2)}"

enh: str.to_titlecase #3060

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enh: `str.to_titlecase` #3060