Function winnow::ascii::alpha1

source · 
pub fn alpha1<Input, Error>(
    input: &mut Input
) -> PResult<<Input as Stream>::Slice, Error>
where
    Input: StreamIsPartial + Stream,
    <Input as Stream>::Token: AsChar,
    Error: ParserError<Input>,
Expand description

Recognizes one or more lowercase and uppercase ASCII alphabetic characters: 'a'..='z', 'A'..='Z'

Complete version: Will return an error if there’s not enough input data, or the whole input if no terminating token is found (a non alphabetic character).

Partial version: Will return Err(winnow::error::ErrMode::Incomplete(_)) if there’s not enough input data, or if no terminating token is found (a non alphabetic character).

§Effective Signature

Assuming you are parsing a &str Stream:

pub fn alpha1<'i>(input: &mut &'i str) -> PResult<&'i str>

§Example

fn parser<'s>(input: &mut &'s str) -> PResult<&'s str, InputError<&'s str>> {
    alpha1.parse_next(input)
}

assert_eq!(parser.parse_peek("aB1c"), Ok(("1c", "aB")));
assert_eq!(parser.parse_peek("1c"), Err(ErrMode::Backtrack(InputError::new("1c", ErrorKind::Slice))));
assert_eq!(parser.parse_peek(""), Err(ErrMode::Backtrack(InputError::new("", ErrorKind::Slice))));
assert_eq!(alpha1::<_, InputError<_>>.parse_peek(Partial::new("aB1c")), Ok((Partial::new("1c"), "aB")));
assert_eq!(alpha1::<_, InputError<_>>.parse_peek(Partial::new("1c")), Err(ErrMode::Backtrack(InputError::new(Partial::new("1c"), ErrorKind::Slice))));
assert_eq!(alpha1::<_, InputError<_>>.parse_peek(Partial::new("")), Err(ErrMode::Incomplete(Needed::new(1))));