use nom7::branch::alt;
use nom7::character::complete::{alpha1, digit1};
use nom7::error::{ErrorKind, ParseError, VerboseError};
use nom7::sequence::tuple;
use nom7::Err::Error;
use nom7::IResult;
use nom_greedyerror::{error_position, GreedyError, Position};
use nom_locate4::LocatedSpan;
type Span<'a> = LocatedSpan<&'a str>;
fn parser<'a, E: ParseError<Span<'a>>>(
input: Span<'a>,
) -> IResult<Span<'a>, (Span<'a>, Span<'a>, Span<'a>), E> {
alt((
tuple((alpha1, digit1, alpha1)),
tuple((digit1, alpha1, digit1)),
))(input)
}
fn main() {
let error = parser::<VerboseError<Span>>(Span::new("abc012:::"));
dbg!(&error);
match error {
Err(Error(e)) => assert_eq!(e.errors.first().map(|x| x.0.position()), Some(0)),
_ => (),
};
let error = parser::<GreedyError<Span, ErrorKind>>(Span::new("abc012:::"));
dbg!(&error);
match error {
Err(Error(e)) => assert_eq!(error_position(&e), Some(6)),
_ => (),
};
}