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"""Alias generators for converting between different capitalization conventions."""
import re
__all__ = ('to_pascal', 'to_camel', 'to_snake')
def to_pascal(snake: str) -> str:
"""Convert a snake_case string to PascalCase.
Args:
snake: The string to convert.
Returns:
The PascalCase string.
"""
camel = snake.title()
return re.sub('([0-9A-Za-z])_(?=[0-9A-Z])', lambda m: m.group(1), camel)
def to_camel(snake: str) -> str:
"""Convert a snake_case string to camelCase.
Args:
snake: The string to convert.
Returns:
The converted camelCase string.
"""
camel = to_pascal(snake)
return re.sub('(^_*[A-Z])', lambda m: m.group(1).lower(), camel)
def to_snake(camel: str) -> str:
"""Convert a PascalCase or camelCase string to snake_case.
Args:
camel: The string to convert.
Returns:
The converted string in snake_case.
"""
# Handle the sequence of uppercase letters followed by a lowercase letter
snake = re.sub(r'([A-Z]+)([A-Z][a-z])', lambda m: f'{m.group(1)}_{m.group(2)}', camel)
# Insert an underscore between a lowercase letter and an uppercase letter
snake = re.sub(r'([a-z])([A-Z])', lambda m: f'{m.group(1)}_{m.group(2)}', snake)
# Insert an underscore between a digit and an uppercase letter
snake = re.sub(r'([0-9])([A-Z])', lambda m: f'{m.group(1)}_{m.group(2)}', snake)
# Insert an underscore between a lowercase letter and a digit
snake = re.sub(r'([a-z])([0-9])', lambda m: f'{m.group(1)}_{m.group(2)}', snake)
return snake.lower()