Function winnow::binary::length_repeat
source · pub fn length_repeat<Input, Output, Accumulator, Count, Error, CountParser, ParseNext>(
count: CountParser,
parser: ParseNext
) -> impl Parser<Input, Accumulator, Error>where
Input: Stream,
Count: ToUsize,
Accumulator: Accumulate<Output>,
CountParser: Parser<Input, Count, Error>,
ParseNext: Parser<Input, Output, Error>,
Error: ParserError<Input>,
Expand description
Accumulate
a length-prefixed sequence of values (TLV)
If the length represents token counts, see instead length_take
§Example
use winnow::Bytes;
use winnow::binary::u8;
use winnow::binary::length_repeat;
type Stream<'i> = &'i Bytes;
fn stream(b: &[u8]) -> Stream<'_> {
Bytes::new(b)
}
fn parser(s: Stream<'_>) -> IResult<Stream<'_>, Vec<&[u8]>> {
length_repeat(u8.map(|i| {
println!("got number: {}", i);
i
}), "abc").parse_peek(s)
}
assert_eq!(parser(stream(b"\x02abcabcabc")), Ok((stream(b"abc"), vec![&b"abc"[..], &b"abc"[..]])));
assert_eq!(parser(stream(b"\x03123123123")), Err(ErrMode::Backtrack(InputError::new(stream(b"123123123"), ErrorKind::Tag))));