Function nom_errors::result_from_parser

source · 
pub fn result_from_parser<I, O, E, F>(
    r: NomRes<I, O, E, F>
) -> Result<(I, O), NomErr<E, F>>
Examples found in repository?
src/lib.rs (line 83)
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pub fn map_err<I: Clone, O, E, F, X>(
    mut parser: impl FnMut(I) -> NomRes<I, O, E, F>,
    mut f: impl FnMut(E, I) -> X
) -> impl FnMut(I) -> NomRes<I, O, X, F> {
    move |input: I| {
        parser_from_result(result_from_parser(parser(input.clone())).map_err(|e| e.map_err(|e| f(e, input))))
    }
}

pub fn any_err<I: Clone, O, F, X>(
    mut parser: impl FnMut(I) -> NomRes<I, O, !, F>,
) -> impl FnMut(I) -> NomRes<I, O, X, F> {
    move |input: I| parser_from_result(result_from_parser(parser(input.clone())).map_err(|e| e.any_err()))
}

pub fn uni_err_no_fail<I, O>(
    mut parser: impl FnMut(I) -> IResult<I, O, ()>
) -> impl FnMut(I) -> NomRes<I, O, (), !> {
    move |input: I| parser_from_result(match parser(input) {
        Ok((i, o)) => Ok((i, o)),
        Err(nom::Err::Error(())) => Err(NomErr::Error(())),
        _ => panic!(),
    })
}

pub fn alt_2<I: Clone, O, E, F, X1>(
    mut a: impl FnMut(I) -> NomRes<I, O, X1, F>,
    mut b: impl FnMut(I) -> NomRes<I, O, E, F>,
) -> impl FnMut(I) -> NomRes<I, O, E, F> {
    move |input: I| parser_from_result(match result_from_parser(a(input.clone())) {
        Ok(r) => Ok(r),
        Err(NomErr::Failure(f)) => Err(NomErr::Failure(f)),
        Err(NomErr::Error(_)) => result_from_parser(b(input)),
    })
}

pub fn many0<I: Clone + InputLength, O, E, F>(
    mut parser: impl FnMut(I) -> NomRes<I, O, E, F>
) -> impl FnMut(I) -> NomRes<I, Vec<O>, !, F> {
    move |mut input: I| parser_from_result({
        let mut r = Vec::new();
        loop {
            if input.input_len() == 0 { break Ok(()); }
            match result_from_parser(parser(input.clone())) {
                Ok((i, o)) => {
                    assert_ne!(i.input_len(), input.input_len(), "invalid many0 parser");
                    input = i;
                    r.push(o);
                },
                Err(NomErr::Failure(f)) => break Err(NomErr::Failure(f)),
                Err(NomErr::Error(_)) => break Ok(()),
            }
        }.map(|()| (input, r))
    })
}

pub fn map<I, O, E, F, X>(
    mut parser: impl FnMut(I) -> NomRes<I, O, E, F>,
    mut f: impl FnMut(O) -> X
) -> impl FnMut(I) -> NomRes<I, X, E, F> {
    move |input: I| parser_from_result(result_from_parser(parser(input)).map(|(i, r)| (i, f(r))))
}

pub fn all_consuming<I: InputLength, O, E, F>(
    mut parser: impl FnMut(I) -> NomRes<I, O, E, F>,
    mut f: impl FnMut(I) -> NomErr<E, F>,
) -> impl FnMut(I) -> NomRes<I, O, E, F> {
    move |input: I| parser_from_result(result_from_parser(parser(input)).and_then(|(i, r)|
        if i.input_len() == 0 { Ok((i, r)) } else { Err(f(i)) }
    ))
}