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use core::pin::Pin;
use array_trait::Array;
use slice_ops::AsSlice;
use crate::private;
use super::ArraySplit;
#[const_trait]
pub trait ArrayChunks<T, const N: usize>: Array + AsSlice<Item = T>
{
/// Divides an array into chunks, then yielding the rest in a separate array.
///
/// # Example
///
/// ```rust
/// #![feature(generic_const_exprs)]
/// #![feature(generic_arg_infer)]
///
/// use array__ops::ops::*;
///
/// let array = ["carrot", "potato", "beet", "tomato", "kiwi", "banana", "cherry", "peach", "strawberry", "nine volt batteries"];
///
/// let ([root_vegetables, technically_berries, stone_fruits], not_for_human_consumption) = array.chunks::<3>();
///
/// assert_eq!(root_vegetables, ["carrot", "potato", "beet"]);
/// assert_eq!(technically_berries, ["tomato", "kiwi", "banana"]);
/// assert_eq!(stone_fruits, ["cherry", "peach", "strawberry"]);
/// assert_eq!(not_for_human_consumption, ["nine volt batteries"]);
/// ```
fn chunks<const M: usize>(self) -> ([[T; M]; N / M], [T; N % M])
where
[(); N % M]:,
[(); N / M]:;
/// Divides an array-slice into chunks, then yielding the rest in a separate array-slice.
///
/// # Example
///
/// ```rust
/// #![feature(generic_const_exprs)]
/// #![feature(generic_arg_infer)]
///
/// use array__ops::ops::*;
///
/// let transistors = ["2N3904", "2N2222A", "BC107", "AC127", "OC7", "NKT275", "2SK30A", "2N5458", "J108", "2N7000", "BS170"];
///
/// let ([silicon_bjts, germanium_bjts, jfets], mosfets) = transistors.chunks_ref::<3>();
///
/// assert_eq!(silicon_bjts, &["2N3904", "2N2222A", "BC107"]);
/// assert_eq!(germanium_bjts, &["AC127", "OC7", "NKT275"]);
/// assert_eq!(jfets, &["2SK30A", "2N5458", "J108"]);
/// assert_eq!(mosfets, &["2N7000", "BS170"]);
/// ```
fn chunks_ref<const M: usize>(&self) -> (&[[T; M]; N / M], &[T; N % M])
where
[(); N % M]:,
[(); N / M]:;
/// Divides a mutable array-slice into chunks, then yielding the rest in a separate mutable array-slice.
///
/// # Example
///
/// ```rust
/// #![feature(generic_const_exprs)]
/// #![feature(generic_arg_infer)]
///
/// use array__ops::ops::*;
///
/// let mut array = [0, 1, 0, 1, 0, 1, 6];
///
/// let (pairs, last) = array.chunks_mut::<2>();
///
/// for (i, pair) in pairs.into_iter().enumerate()
/// {
/// for number in pair
/// {
/// *number += i*2;
/// }
/// }
///
/// assert_eq!(array, [0, 1, 2, 3, 4, 5, 6]);
/// ```
fn chunks_mut<const M: usize>(&mut self) -> (&mut [[T; M]; N / M], &mut [T; N % M])
where
[(); N % M]:,
[(); N / M]:;
fn chunks_pin_ref<const M: usize>(self: Pin<&Self>) -> (Pin<&[[T; M]; N / M]>, Pin<&[T; N % M]>)
where
[(); N % M]:,
[(); N / M]:;
fn chunks_pin_mut<const M: usize>(self: Pin<&mut Self>) -> (Pin<&mut [[T; M]; N / M]>, Pin<&mut [T; N % M]>)
where
[(); N % M]:,
[(); N / M]:;
/// Divides a mutable array-slice into chunks, then yielding the leftmost rest in a separate mutable array-slice.
fn rchunks<const M: usize>(self) -> ([T; N % M], [[T; M]; N / M])
where
[(); N % M]:,
[(); N / M]:;
/// Divides an array-slice into chunks, then yielding the leftmost rest in a separate array-slice.
fn rchunks_ref<const M: usize>(&self) -> (&[T; N % M], &[[T; M]; N / M])
where
[(); N % M]:,
[(); N / M]:;
/// Divides a mutable array-slice into chunks, then yielding the leftmost rest in a separate array-slice.
fn rchunks_mut<const M: usize>(&mut self) -> (&mut [T; N % M], &mut [[T; M]; N / M])
where
[(); N % M]:,
[(); N / M]:;
fn rchunks_pin_ref<const M: usize>(self: Pin<&Self>) -> (Pin<&[T; N % M]>, Pin<&[[T; M]; N / M]>)
where
[(); N % M]:,
[(); N / M]:;
fn rchunks_pin_mut<const M: usize>(self: Pin<&mut Self>) -> (Pin<&mut [T; N % M]>, Pin<&mut [[T; M]; N / M]>)
where
[(); N % M]:,
[(); N / M]:;
/// Divides an array into chunks, with no rest.
///
/// The chunk length must be a factor of the array length, otherwise it will not compile.
///
/// # Example
///
/// ```rust
/// #![feature(generic_const_exprs)]
/// #![feature(generic_arg_infer)]
///
/// use array__ops::ops::*;
///
/// let array = [0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9];
///
/// let [lower_half, upper_half] = array.chunks_exact::<5>();
///
/// assert_eq!(lower_half, [0.0, 0.1, 0.2, 0.3, 0.4]);
/// assert_eq!(upper_half, [0.5, 0.6, 0.7, 0.8, 0.9]);
/// ```
fn chunks_exact<const M: usize>(self) -> [[T; M]; N / M]
where
[(); 0 - N % M]:,
[(); N / M]:;
/// Divides an array-slice into chunks, with no rest.
///
/// The chunk length must be a factor of the array length, otherwise it will not compile.
///
/// # Example
///
/// ```rust
/// #![feature(generic_const_exprs)]
/// #![feature(generic_arg_infer)]
///
/// use array__ops::ops::*;
///
/// let array = [0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9];
///
/// let [lower_half, upper_half] = array.chunks_exact_ref::<5>();
///
/// assert_eq!(lower_half, &[0.0, 0.1, 0.2, 0.3, 0.4]);
/// assert_eq!(upper_half, &[0.5, 0.6, 0.7, 0.8, 0.9]);
/// ```
fn chunks_exact_ref<const M: usize>(&self) -> &[[T; M]; N / M]
where
[(); 0 - N % M]:,
[(); N / M]:;
/// Divides a mutable array-slice into chunks, with no rest.
///
/// The chunk length must be a factor of the array length, otherwise it will not compile.
fn chunks_exact_mut<const M: usize>(&mut self) -> &mut [[T; M]; N / M]
where
[(); 0 - N % M]:,
[(); N / M]:;
fn chunks_exact_pin_ref<const M: usize>(self: Pin<&Self>) -> Pin<&[[T; M]; N / M]>
where
[(); 0 - N % M]:,
[(); N / M]:;
fn chunks_exact_pin_mut<const M: usize>(self: Pin<&mut Self>) -> Pin<&mut [[T; M]; N / M]>
where
[(); 0 - N % M]:,
[(); N / M]:;
}
impl<T, const N: usize> const ArrayChunks<T, N> for [T; N]
{
fn chunks<const M: usize>(self) -> ([[T; M]; N / M], [T; N % M])
{
unsafe {
private::split_transmute(self)
}
}
fn chunks_ref<const M: usize>(&self) -> (&[[T; M]; N / M], &[T; N % M])
{
let (left, right) = self.rsplit_ptr(N % M);
let chunks = unsafe {
left.cast::<[[T; M]; N / M]>().as_ref_unchecked()
};
let rest = unsafe {
right.cast::<[T; N % M]>().as_ref_unchecked()
};
(chunks, rest)
}
fn chunks_mut<const M: usize>(&mut self) -> (&mut [[T; M]; N / M], &mut [T; N % M])
{
let (left, right) = self.rsplit_mut_ptr(N % M);
let chunks = unsafe {
left.cast::<[[T; M]; N / M]>().as_mut_unchecked()
};
let rest = unsafe {
right.cast::<[T; N % M]>().as_mut_unchecked()
};
(chunks, rest)
}
fn chunks_pin_ref<const M: usize>(self: Pin<&Self>) -> (Pin<&[[T; M]; N / M]>, Pin<&[T; N % M]>)
where
[(); N % M]:,
[(); N / M]:
{
let (chunks, rest) = self.get_ref().chunks_ref();
unsafe {
(
Pin::new_unchecked(chunks),
Pin::new_unchecked(rest)
)
}
}
fn chunks_pin_mut<const M: usize>(self: Pin<&mut Self>) -> (Pin<&mut [[T; M]; N / M]>, Pin<&mut [T; N % M]>)
where
[(); N % M]:,
[(); N / M]:
{
unsafe {
let (chunks, rest) = self.get_unchecked_mut().chunks_mut();
(
Pin::new_unchecked(chunks),
Pin::new_unchecked(rest)
)
}
}
fn rchunks<const M: usize>(self) -> ([T; N % M], [[T; M]; N / M])
{
unsafe {
private::split_transmute(self)
}
}
fn rchunks_ref<const M: usize>(&self) -> (&[T; N % M], &[[T; M]; N / M])
{
let (left, right) = self.split_ptr(N % M);
let rest = unsafe {
left.cast::<[T; N % M]>().as_ref_unchecked()
};
let chunks = unsafe {
right.cast::<[[T; M]; N / M]>().as_ref_unchecked()
};
(rest, chunks)
}
fn rchunks_mut<const M: usize>(&mut self) -> (&mut [T; N % M], &mut [[T; M]; N / M])
{
let (left, right) = self.split_mut_ptr(N % M);
let rest = unsafe {
left.cast::<[T; N % M]>().as_mut_unchecked()
};
let chunks = unsafe {
right.cast::<[[T; M]; N / M]>().as_mut_unchecked()
};
(rest, chunks)
}
fn rchunks_pin_ref<const M: usize>(self: Pin<&Self>) -> (Pin<&[T; N % M]>, Pin<&[[T; M]; N / M]>)
where
[(); N % M]:,
[(); N / M]:
{
let (rest, chunks) = self.get_ref().rchunks_ref();
unsafe {
(
Pin::new_unchecked(rest),
Pin::new_unchecked(chunks)
)
}
}
fn rchunks_pin_mut<const M: usize>(self: Pin<&mut Self>) -> (Pin<&mut [T; N % M]>, Pin<&mut [[T; M]; N / M]>)
where
[(); N % M]:,
[(); N / M]:
{
unsafe {
let (rest, chunks) = self.get_unchecked_mut().rchunks_mut();
(
Pin::new_unchecked(rest),
Pin::new_unchecked(chunks)
)
}
}
fn chunks_exact<const M: usize>(self) -> [[T; M]; N / M]
where
[(); 0 - N % M]:,
[(); N / M]:
{
unsafe {
private::transmute(self)
}
}
fn chunks_exact_ref<const M: usize>(&self) -> &[[T; M]; N / M]
where
[(); 0 - N % M]:,
[(); N / M]:
{
unsafe {
self.as_ptr().cast::<[[T; M]; N / M]>().as_ref_unchecked()
}
}
fn chunks_exact_mut<const M: usize>(&mut self) -> &mut [[T; M]; N / M]
where
[(); 0 - N % M]:,
[(); N / M]:
{
unsafe {
self.as_mut_ptr().cast::<[[T; M]; N / M]>().as_mut_unchecked()
}
}
fn chunks_exact_pin_ref<const M: usize>(self: Pin<&Self>) -> Pin<&[[T; M]; N / M]>
where
[(); 0 - N % M]:,
[(); N / M]:
{
unsafe {
Pin::new_unchecked(self.get_ref().chunks_exact_ref())
}
}
fn chunks_exact_pin_mut<const M: usize>(self: Pin<&mut Self>) -> Pin<&mut [[T; M]; N / M]>
where
[(); 0 - N % M]:,
[(); N / M]:
{
unsafe {
Pin::new_unchecked(self.get_unchecked_mut().chunks_exact_mut())
}
}
}