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//! [Bits] associated types for slices.
use crate::bits::Bits;
use crate::bits_mut::BitsMut;
use crate::endian::{DefaultEndian, Endian};
use crate::BitsOwned;
impl<T> Bits for [T]
where
T: BitsOwned,
{
type IterOnes<'a> = IterOnes<'a, T, DefaultEndian> where Self: 'a;
type IterOnesIn<'a, E> = IterOnes<'a, T, E> where Self: 'a, E: Endian;
type IterZeros<'a> = IterZeros<'a, T, DefaultEndian> where Self: 'a;
type IterZerosIn<'a, E> = IterZeros<'a, T, E> where Self: 'a, E: Endian;
/// Count the number of ones in the slice.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let a: [u8; 2] = bittle::set![4, 11, 14];
/// let a = a.as_slice();
/// assert_eq!(a.count_ones(), 3);
/// ```
#[inline]
fn count_ones(&self) -> u32 {
self.iter().map(Bits::count_ones).sum()
}
/// Count the number of zeros in the slice.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let a: [u8; 2] = bittle::set![4, 11, 14];
/// let a = a.as_slice();
/// assert_eq!(a.count_zeros(), 13);
/// ```
#[inline]
fn count_zeros(&self) -> u32 {
self.iter().map(Bits::count_zeros).sum()
}
/// Get the capacity of the slice.
///
/// The capacity of a slice is determined by its length.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let a: [u8; 4] = bittle::set![4, 11, 14];
/// let a = &a[..2];
/// assert_eq!(a.bits_capacity(), 16);
/// ```
#[inline]
fn bits_capacity(&self) -> u32 {
let len = u32::try_from(self.len()).unwrap_or(u32::MAX);
len.saturating_mul(T::BITS)
}
/// Test if the slice is all zeros.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let a: [u8; 2] = bittle::set![];
/// let a = a.as_slice();
/// assert!(a.all_zeros());
///
/// let a: [u8; 2] = bittle::set![4, 11, 14];
/// let a = a.as_slice();
/// assert!(!a.all_zeros());
/// ```
#[inline]
fn all_zeros(&self) -> bool {
self.iter().all(Bits::all_zeros)
}
/// Test if the slice is all ones.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let a: [u8; 2] = bittle::set![0..16];
/// let a = a.as_slice();
/// assert!(a.all_ones());
///
/// let a: [u8; 2] = bittle::set![4, 11, 14];
/// let a = a.as_slice();
/// assert!(!a.all_ones());
/// ```
#[inline]
fn all_ones(&self) -> bool {
self.iter().all(Bits::all_ones)
}
/// Test if the given bit is set in the slice.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let mut a: [u8; 2] = bittle::set![4, 11, 14];
/// let a: &[u8] = a.as_slice();
/// assert!(a.test_bit(4));
/// ```
#[inline]
fn test_bit(&self, index: u32) -> bool {
self.test_bit_in::<DefaultEndian>(index)
}
/// Test if the given bit is set in the slice.
///
/// # Examples
///
/// ```
/// use bittle::{Bits, BigEndian};
///
/// let mut a: [u8; 2] = bittle::set_be![4, 11, 14];
/// let a: &[u8] = a.as_slice();
/// assert!(a.test_bit_in::<BigEndian>(4));
/// ```
#[inline]
fn test_bit_in<E>(&self, index: u32) -> bool
where
E: Endian,
{
self[(index / T::BITS) as usize % self.len()].test_bit_in::<E>(index % T::BITS)
}
/// Iterates over all ones in the slice using [`DefaultEndian`] indexing.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let mut a: [u8; 2] = bittle::set![4, 11, 14];
/// let a: &[u8] = a.as_slice();
/// assert!(a.iter_ones().eq([4, 11, 14]));
///
/// let a: &[u8] = &[];
/// assert!(a.iter_ones().eq([]));
/// ```
#[inline]
fn iter_ones(&self) -> Self::IterOnes<'_> {
IterOnes::new(self)
}
/// Iterates over all ones in the slice using a custom [`Endian`] indexing.
///
/// # Examples
///
/// ```
/// use bittle::{Bits, LittleEndian};
///
/// let mut a: [u8; 2] = bittle::set_le![4, 11, 14];
/// let a: &[u8] = a.as_slice();
/// assert!(a.iter_ones_in::<LittleEndian>().eq([4, 11, 14]));
/// ```
#[inline]
fn iter_ones_in<E>(&self) -> Self::IterOnesIn<'_, E>
where
E: Endian,
{
IterOnes::new(self)
}
/// Iterates over all zeros in the slice using [`DefaultEndian`] indexing.
///
/// # Examples
///
/// ```
/// use bittle::Bits;
///
/// let mut a: [u8; 2] = bittle::set![4, 11, 14];
/// let a: &[u8] = a.as_slice();
/// assert!(a.iter_zeros().eq([0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 12, 13, 15]));
///
/// let a: &[u8] = &[];
/// assert!(a.iter_zeros().eq([]));
/// ```
#[inline]
fn iter_zeros(&self) -> Self::IterZeros<'_> {
IterZeros::new(self)
}
/// Iterates over all zeros in the slice using a custom [`Endian`] indexing
///
/// # Examples
///
/// ```
/// use bittle::{Bits, LittleEndian};
///
/// let mut a: [u8; 2] = bittle::set_le![4, 11, 14];
/// let a: &[u8] = a.as_slice();
/// assert!(a.iter_zeros_in::<LittleEndian>().eq([0, 1, 2, 3, 5, 6, 7, 8, 9, 10, 12, 13, 15]));
/// ```
#[inline]
fn iter_zeros_in<E>(&self) -> Self::IterZerosIn<'_, E>
where
E: Endian,
{
IterZeros::new(self)
}
}
impl<T> BitsMut for [T]
where
T: BitsOwned,
{
/// Set the given bit is set in the slice.
///
/// # Examples
///
/// ```
/// use bittle::{Bits, BitsMut};
///
/// let mut a: [u8; 2] = bittle::set![7];
/// let a: &mut [u8] = a.as_mut_slice();
/// a.set_bit(13);
/// assert!(a.iter_ones().eq([7, 13]));
/// ```
#[inline]
fn set_bit_in<E>(&mut self, index: u32)
where
E: Endian,
{
self[(index / T::BITS) as usize % self.len()].set_bit_in::<E>(index % T::BITS);
}
#[inline]
fn set_bit(&mut self, index: u32) {
self.set_bit_in::<DefaultEndian>(index);
}
/// Set the given bit is set in the slice.
///
/// # Examples
///
/// ```
/// use bittle::{Bits, BitsMut};
///
/// let mut a: [u8; 2] = bittle::set![7, 13];
/// let a: &mut [u8] = a.as_mut_slice();
/// a.clear_bit(13);
/// assert!(a.iter_ones().eq([7]));
/// ```
#[inline]
fn clear_bit_in<E>(&mut self, index: u32)
where
E: Endian,
{
self[(index / T::BITS) as usize % self.len()].clear_bit_in::<E>(index % T::BITS);
}
#[inline]
fn clear_bit(&mut self, index: u32) {
self.clear_bit_in::<DefaultEndian>(index);
}
/// Clear the entire slice, or set all bits to zeros.
///
/// # Examples
///
/// ```
/// use bittle::{Bits, BitsMut};
///
/// let mut a: [u8; 2] = bittle::set![7, 13];
/// let a: &mut [u8] = a.as_mut_slice();
/// a.clear_bits();
/// assert!(a.all_zeros());
/// ```
#[inline]
fn clear_bits(&mut self) {
for b in self {
b.clear_bits();
}
}
#[inline]
fn union_assign(&mut self, other: &Self) {
for (o, i) in self.iter_mut().zip(other) {
o.union_assign(i);
}
}
#[inline]
fn conjunction_assign(&mut self, other: &Self) {
for (o, i) in self.iter_mut().zip(other) {
o.conjunction_assign(i);
}
}
#[inline]
fn difference_assign(&mut self, other: &Self) {
for (o, i) in self.iter_mut().zip(other) {
o.difference_assign(i);
}
}
#[inline]
fn symmetric_difference_assign(&mut self, other: &Self) {
for (o, i) in self.iter_mut().zip(other) {
o.symmetric_difference_assign(i);
}
}
}
impl_iter! {
/// A borrowing iterator over the bits set to one in a slice.
{T, E} IterOnes<'a, T, E>
{iter_ones_in, T::IterOnesIn<'a, E>, core::slice::Iter<'a, T>}
{slice: &'a [T] => slice.len()}
{}
}
impl_iter! {
/// An owned iterator over the bits set to zero in an array.
{T, E} IterZeros<'a, T, E>
{iter_zeros_in, T::IterZerosIn<'a, E>, core::slice::Iter<'a, T>}
{slice: &'a [T] => slice.len()}
{}
}