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Editing: alias_generators.py

"""Alias generators for converting between different capitalization conventions."""

import re

__all__ = ('to_pascal', 'to_camel', 'to_snake')

# TODO: in V3, change the argument names to be more descriptive
# Generally, don't only convert from snake_case, or name the functions
# more specifically like snake_to_camel.

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.
    """
    # If the string is already in camelCase and does not contain a digit followed
    # by a lowercase letter, return it as it is
    if re.match('^[a-z]+[A-Za-z0-9]*$', snake) and not re.search(r'\d[a-z]', snake):
        return snake

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, camelCase, or kebab-case 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)
    # Replace hyphens with underscores to handle kebab-case
    snake = snake.replace('-', '_')
    return snake.lower()

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