How to emulate take_until_and_consume in nom 5.x?

user_6121268 0
Viewed 268

I've updated my nom dependency from 4.x to 5.x version and found that macro take_until_and_consume is deprecated. Changelog says:

"this can be replaced with take_until combined with take"

but I don't know how to emulate take_until_and_consume with them. Has anyone encountered such a problem with version updating or does anyone know how to do this?

I mean this deprecated macro take_until_and_consume. And these new: take and take_until

nom rust
1 Answers

I believe this is straiforward but here a generic implementation:

fn take_until_and_consume<T, I, E>(tag: T) -> impl Fn(I) -> nom::IResult<I, I, E>
where
    E: nom::error::ParseError<I>,
    I: nom::InputTake
        + nom::FindSubstring<T>
        + nom::Slice<std::ops::RangeFrom<usize>>
        + nom::InputIter<Item = u8>
        + nom::InputLength,
    T: nom::InputLength + Clone,
{
    use nom::bytes::streaming::take;
    use nom::bytes::streaming::take_until;
    use nom::sequence::terminated;

    move |input| terminated(take_until(tag.clone()), take(tag.input_len()))(input)
}

#[test]
fn test_take_until_and_consume() {
    let r = take_until_and_consume::<_, _, ()>("foo")(&b"abcd foo efgh"[..]);
    assert_eq!(r, Ok((&b" efgh"[..], &b"abcd "[..])));
}
user_70761530
Related