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separated_tuple.rs
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separated_tuple.rs
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use super::*;
pub fn separated_tuple<I, O, O2, E, List, G>(
mut sep: G,
mut t: List,
) -> impl FnMut(I) -> IResult<I, O, E>
where
I: Clone + InputLength,
List: SeparatedTuple<I, O, E>,
G: Parser<I, O2, E>,
E: ParseError<I>,
{
move |input: I| t.parse(input, |i| sep.parse(i))
}
/// Like [`tuple`] but ignores whitespace between elements.
pub fn ws_tuple<I, O, E: ParseError<I>, List: SeparatedTuple<I, O, E>>(
l: List,
) -> impl FnMut(I) -> IResult<I, O, E>
where
I: Clone + InputLength + InputTakeAtPosition,
<I as InputTakeAtPosition>::Item: AsChar + Clone,
{
separated_tuple(space0, l)
}
/// Helper trait for the [`separated_tuple`] combinator.
pub trait SeparatedTuple<I, O, E> {
/// Parses the input and returns a tuple of results of each parser.
fn parse<O2, Sep: Parser<I, O2, E>>(&mut self, input: I, sep: Sep) -> IResult<I, O, E>;
}
impl<A, I, OA, E> SeparatedTuple<I, (OA,), E> for (A,)
where
A: Parser<I, OA, E>,
E: ParseError<I>,
{
fn parse<O2, Sep: Parser<I, O2, E>>(&mut self, input: I, _sep: Sep) -> IResult<I, (OA,), E> {
let (a,) = self;
let (input, a) = a.parse(input)?;
Ok((input, (a,)))
}
}
macro_rules! impl_separated_tuple_trait {
(
$($field:ident $parser_ty:ident $output_ty:ident),*
| $last_field:ident $last_parser_ty:ident $last_output_ty:ident
) => {
impl<
I,
$($parser_ty, $output_ty),*,
$last_parser_ty, $last_output_ty,
E,
> SeparatedTuple<
I,
($($output_ty),*, $last_output_ty,),
E,
> for ($($parser_ty),*, $last_parser_ty)
where
I: Clone,
$($parser_ty: Parser<I, $output_ty, E>),*,
$last_parser_ty: Parser<I, $last_output_ty, E>,
E: ParseError<I>,
{
fn parse<O2, Sep: Parser<I, O2, E>>(
&mut self,
input: I,
mut sep: Sep,
) -> IResult<I, ($($output_ty),*, $last_output_ty), E> {
let ($($field),*, $last_field) = self;
$(
let (input, $field) = terminated(|i| $field.parse(i), |i| sep.parse(i))(input)?;
)*
let (input, $last_field) = $last_field.parse(input)?;
Ok((input, ($($field),*, $last_field)))
}
}
};
}
impl_separated_tuple_trait!(a A AO | b B BO);
impl_separated_tuple_trait!(
a A AO, b B BO | c C CO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO | d D DO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO | f F FO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO, f F FO | g G GO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO, f F FO, g G GO | h H HO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO, f F FO, g G GO, h H HO | j J JO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO, f F FO, g G GO, h H HO, j J JO | k K KO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO, f F FO, g G GO, h H HO, j J JO, k K KO | l L LO
);
impl_separated_tuple_trait!(
a A AO, b B BO, c C CO, d D DO, f F FO, g G GO, h H HO, j J JO, k K KO, l L LO | m M MO
);
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_separated_tuple() {
let mut parser = final_parser(ws_tuple((tag("a"), tag("b"), tag("c"))));
parser("abc").unwrap();
parser("a bc").unwrap();
parser("ab c").unwrap();
parser("a b c").unwrap();
parser("a b c").unwrap();
parser("a \tb\t c").unwrap();
parser("abc ").unwrap_err();
parser(" abc").unwrap_err();
}
}