import re
from typing import Optional
from dataclasses import dataclass

@dataclass
class ContentDisposition:

    method: str
    filename: Optional[str] = None

    @classmethod
    def from_str(cls, disposition: str):

        m = re.match("(?P<type>(inline)|(attachment))(;\\s*(filename=\"(?P<filename>.+)\"\\s*))?", disposition)

        if m is None:
            raise ValueError(f"Error while parsing disposition string '{ disposition }'.")

        d = m.groupdict()

        return cls(d["type"], d.get("filename", None))

def heading_sanitization(heading: str) -> str:
    """
    Removes some parts of headings and path names.

    Currently these optimizations are done:
    - if the heading is "Inhalt" it is replaced by the empty string

    Otherwise the heading is returned as is.
    """

    if heading == "Inhalt":
        return ""

    return heading