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use std::fmt; use std::ops::{Deref, DerefMut}; use enum_iterator::{IterableEnum, EnumIterator}; pub trait BitmaskTrait { type Array: Sized; type Index: Copy + IterableEnum; fn array_default() -> Self::Array; fn array_slice(array: &Self::Array) -> &[u8]; fn array_slice_mut(array: &mut Self::Array) -> &mut [u8]; fn index(index: Self::Index) -> usize; fn index_valid(_array: &Self::Array, _index: Self::Index) -> bool { true } } impl BitmaskTrait for Vec<u8> { type Array = Self; type Index = u16; fn array_default() -> Self::Array { vec![0u8; 0x10] } fn array_slice(array: &Self::Array) -> &[u8] { array } fn array_slice_mut(array: &mut Self::Array) -> &mut [u8] { array } fn index(index: Self::Index) -> usize { index as _ } fn index_valid(array: &Self::Array, index: Self::Index) -> bool { array.len() > index as usize } } pub type BitmaskVec = Bitmask<Vec<u8>>; impl Bitmask<Vec<u8>> { pub fn resize(&mut self, kind: ::EventKind) { self.data_mut().resize((kind.count_bits().unwrap_or(0x80) + 7) / 8, 0); } } #[derive(Copy, Clone)] pub struct Bitmask<T: BitmaskTrait> { mask: T::Array, } impl<T: BitmaskTrait> Default for Bitmask<T> { fn default() -> Self { Bitmask { mask: T::array_default(), } } } impl<T: BitmaskTrait> Bitmask<T> { pub fn into_inner(self) -> T::Array { self.mask } pub fn iter(&self) -> BitmaskIterator<T> { self.into_iter() } pub fn data(&self) -> &T::Array { &self.mask } pub fn data_mut(&mut self) -> &mut T::Array { &mut self.mask } pub fn slice(&self) -> &[u8] { T::array_slice(&self.mask) } pub fn slice_mut(&mut self) -> &mut [u8] { T::array_slice_mut(&mut self.mask) } pub fn index(index: T::Index) -> (usize, usize) { let index = T::index(index); (index / 8, index % 8) } pub fn index_valid(&self, index: T::Index) -> bool { T::index_valid(&self.mask, index) } pub fn get(&self, index: T::Index) -> bool { let (offset, shift) = Self::index(index); (self.slice()[offset] & (1u8 << shift)) != 0 } pub fn set(&mut self, index: T::Index) { let (offset, shift) = Self::index(index); let v = &mut self.slice_mut()[offset]; *v |= 1u8 << shift; } pub fn clear(&mut self, index: T::Index) { let (offset, shift) = Self::index(index); let v = &mut self.slice_mut()[offset]; *v &= !(1u8 << shift); } pub fn flip(&mut self, index: T::Index) { let (offset, shift) = Self::index(index); self.slice_mut()[offset] ^= 1u8 << shift; } pub fn or<I: IntoIterator<Item=T::Index>>(&mut self, indices: I) { for index in indices { self.set(index); } } } impl<'a, T: BitmaskTrait> IntoIterator for &'a Bitmask<T> { type Item = T::Index; type IntoIter = BitmaskIterator<'a, T>; fn into_iter(self) -> Self::IntoIter { BitmaskIterator { mask: self, iter: T::Index::iter(), } } } pub struct BitmaskIterator<'a, T: BitmaskTrait + 'a> { mask: &'a Bitmask<T>, iter: EnumIterator<T::Index>, } impl<'a, T: BitmaskTrait> Iterator for BitmaskIterator<'a, T> { type Item = T::Index; fn next(&mut self) -> Option<Self::Item> { let mask = &self.mask; self.iter.by_ref().take_while(|i| mask.index_valid(*i)).filter(|i| mask.get(*i)).next() } } impl<T: BitmaskTrait> fmt::Debug for Bitmask<T> where T::Index: fmt::Debug { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { f.debug_list().entries(self.into_iter()).finish() } } impl<T: BitmaskTrait> Deref for Bitmask<T> { type Target = [u8]; fn deref(&self) -> &Self::Target { self.slice() } } impl<T: BitmaskTrait> DerefMut for Bitmask<T> { fn deref_mut(&mut self) -> &mut Self::Target { self.slice_mut() } } impl<T: BitmaskTrait> AsRef<[u8]> for Bitmask<T> { fn as_ref(&self) -> &[u8] { self.slice() } } impl<T: BitmaskTrait> AsMut<[u8]> for Bitmask<T> { fn as_mut(&mut self) -> &mut [u8] { self.slice_mut() } }