Current File : //opt/hc_python/lib64/python3.8/site-packages/pydantic/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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