import re


# Adapted from this response in Stackoverflow
# http://stackoverflow.com/a/19053800/1072990
def to_camel_case(snake_str: str) -> str:
    components = snake_str.split("_")
    # We capitalize the first letter of each component except the first one
    # with the 'capitalize' method and join them together.
    return components[0] + "".join(x.capitalize() if x else "_" for x in components[1:])


TO_KEBAB_CASE_RE = re.compile("((?<=[a-z0-9])[A-Z]|(?!^)[A-Z](?=[a-z]))")


def to_kebab_case(name: str) -> str:
    return TO_KEBAB_CASE_RE.sub(r"-\1", name).lower()


def capitalize_first(name: str) -> str:
    return name[0].upper() + name[1:]


def to_snake_case(name: str) -> str:
    name = re.sub("(.)([A-Z][a-z]+)", r"\1_\2", name)
    return re.sub("([a-z0-9])([A-Z])", r"\1_\2", name).lower()


__all__ = ["to_camel_case", "to_kebab_case", "capitalize_first", "to_snake_case"]