Function parse

mitmproxy/flowfilter.py:656–668

Parse a filter expression and return the compiled filter function. If the filter syntax is invalid, `ValueError` is raised.

(s: str)

def parse(s: str) -> TFilter:
    """
    Parse a filter expression and return the compiled filter function.
    If the filter syntax is invalid, `ValueError` is raised.
    """
    if not s:
        raise ValueError("Empty filter expression")
    try:
        flt = bnf.parseString(s, parseAll=True)[0]
        flt.pattern = s
        return flt
    except (pp.ParseException, ValueError) as e:
        raise ValueError(f"Invalid filter expression: {s!r}") from e


def match(flt: str | TFilter, flow: flow.Flow) -> bool: