ttools - [no description]


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#![allow(nonstandard_style)]
use crate::{MapAllMut, Pick, RePick, Tupl};
pub trait IteratorOfTuplesWithF<retval>:
    Iterator<Item: Tupl> + Sized
{
    /// Map the item at: (|(x, y)| (f(x), y))
    fn map_at<const N: usize>(
        self,
        mut f: impl FnMut(<Self::Item as Pick<N>>::At) -> retval,
    ) -> core::iter::Map<
        Self,
        impl FnMut(<Self>::Item) -> <<Self>::Item as RePick<N, retval>>::New,
    >
    where
        Self::Item: RePick<N, retval>,
    {
        self.map(move |x| {
            let (l, at, r) = x.depict();
            let at = f(at);
            Self::Item::unpick(l, at, r)
        })
    }
    /// filter map the item at: (|(x, y)| f(x).zip(Some(y))
    fn filter_map_at<const N: usize>(
        self,
        mut f: impl FnMut(<Self::Item as Pick<N>>::At) -> Option<retval>,
    ) -> core::iter::FilterMap<
        Self,
        impl FnMut(
            <Self as Iterator>::Item,
        ) -> Option<
            <<Self as Iterator>::Item as RePick<N, retval>>::New,
        >,
    >
    where
        Self::Item: RePick<N, retval>,
    {
        self.filter_map(move |x| {
            let (l, at, r) = x.depict();
            f(at).map(|x| Self::Item::unpick(l, x, r))
        })
    }
    /// map the item to just one, then map that one: (|x| f(x.0))
    fn map_on<const N: usize>(
        self,
        f: impl FnMut(<Self::Item as Pick<N>>::At) -> retval,
    ) -> core::iter::Map<
        impl Iterator<Item = <Self::Item as Pick<N>>::At>,
        impl FnMut(<Self::Item as Pick<N>>::At) -> retval,
    >
    where
        Self: Iterator<Item: Pick<N>> + Sized,
    {
        self.on().map(f)
    }
    fn fmap_on<const N: usize>(
        self,
        f: impl FnMut(<Self::Item as Pick<N>>::At) -> retval,
    ) -> core::iter::FlatMap<
        core::iter::Map<
            Self,
            impl FnMut(
                <Self as Iterator>::Item,
            )
                -> <<Self as Iterator>::Item as Pick<N>>::At,
        >,
        retval,
        impl FnMut(<<Self as Iterator>::Item as Pick<N>>::At) -> retval,
    >
    where
        Self::Item: Pick<N>,
        retval: IntoIterator,
    {
        self.on().flat_map(f)
    }
}
pub trait IteratorOfReferencesToTupleWithF<'a, T: Tupl + 'a, retval>:
    Iterator<Item = &'a T> + Sized
{
    /// Map the item at: (|(x, y)| (f(x), y))
    fn map_at<const N: usize>(
        self,
        f: impl FnMut(<T::AsRef<'a> as Pick<N>>::At) -> retval + 'a,
    ) -> impl Iterator<Item = <T::AsRef<'a> as RePick<N, retval>>::New>
    where
        T::AsRef<'a>: RePick<N, retval>,
    {
        self.as_ref().map_at(f)
    }
    /// map the item to just one, then map that one: (|x| f(x.0))
    fn map_on<const N: usize, U>(
        self,
        f: impl FnMut(<T::AsRef<'a> as Pick<N>>::At) -> U,
    ) -> core::iter::Map<
        impl Iterator<Item = <T::AsRef<'a> as Pick<N>>::At>,
        impl FnMut(<T::AsRef<'a> as Pick<N>>::At) -> U,
    >
    where
        T::AsRef<'a>: Pick<N>,
    {
        self.on().map(f)
    }
}

/// may add more later
pub trait IteratorOfTuples: Iterator<Item: Tupl> + Sized {
    /// make it just one: (|x| x.0)
    fn on<const N: usize>(
        self,
    ) -> core::iter::Map<
        Self,
        impl FnMut(
            <Self as Iterator>::Item,
        ) -> <<Self as Iterator>::Item as Pick<N>>::At,
    >
    where
        Self::Item: Pick<N>,
    {
        self.map(|x| x.pick())
    }
    fn flatten_on<const N: usize>(
        self,
    ) -> core::iter::Flatten<
        core::iter::Map<
            Self,
            impl FnMut(
                <Self as Iterator>::Item,
            )
                -> <<Self as Iterator>::Item as Pick<N>>::At,
        >,
    >
    where
        Self::Item: Pick<N, At: IntoIterator>,
    {
        self.on().flatten()
    }
    fn map_all<retval: Tupl, functions: Tupl>(
        self,
        mut fns: functions,
    ) -> impl Iterator<Item = retval>
    where
        Self::Item: MapAllMut<retval, functions>,
    {
        self.map(move |x| x.map_all_mut(&mut fns))
    }
}

/// may add more later
pub trait IteratorOfReferencesToTuple<'a, T: Tupl + 'a>:
    Iterator<Item = &'a T> + Sized
{
    fn as_ref(self) -> core::iter::Map<Self, fn(&T) -> <T>::AsRef<'_>> {
        self.map(T::as_ref)
    }

    /// make it just one: (|x| x.0)
    fn on<const N: usize>(
        self,
    ) -> impl Iterator<Item = <T::AsRef<'a> as Pick<N>>::At>
    where
        T::AsRef<'a>: Pick<N>,
    {
        self.as_ref().on()
    }
    fn map_all<retval: Tupl, functions: Tupl>(
        self,
        mut fns: functions,
    ) -> impl Iterator<Item = retval>
    where
        T::AsRef<'a>: MapAllMut<retval, functions>,
    {
        self.map(move |x| x.as_ref().map_all_mut(&mut fns))
    }
}

impl<I: Iterator<Item: Tupl>> IteratorOfTuples for I {}

impl<U, I: Iterator<Item: Tupl>> IteratorOfTuplesWithF<U> for I {}

impl<'a, T: Tupl + 'a, I: Iterator<Item = &'a T>>
    IteratorOfReferencesToTuple<'a, T> for I
{
}

impl<'a, U, T: Tupl + 'a, I: Iterator<Item = &'a T>>
    IteratorOfReferencesToTupleWithF<'a, T, U> for I
{
}
#[test]
fn x() {
    let x = [(1, 2), (3, 4)].iter().map_at::<0>(|x| x + 2);
    let y = [(1, "a"), (2, "b")]
        .iter()
        .map_all((|x| x + 1, |x| x.to_uppercase()))
        .next_chunk::<2>()
        .unwrap();
}