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use super::*;
use super::data_structures::ArrayLen;
use std::ops::{Deref,Index};
abi_stable_shared::declare_tl_lifetime_types!{
repr=u8,
attrs=[
derive(StableAbi),
]
}
impl Display for LifetimeIndex{
fn fmt(&self,f:&mut fmt::Formatter<'_>)->fmt::Result{
match *self {
LifetimeIndex::STATIC=>f.write_str("'static"),
LifetimeIndex::ANONYMOUS=>f.write_str("'_"),
LifetimeIndex::NONE=>f.write_str("'NONE"),
LifetimeIndex{bits:n}=>write!(f,"'{}",n-Self::START_OF_LIFETIMES),
}
}
}
impl LifetimeRange {
pub fn slicing(self,lifetime_indices:&[LifetimeIndexPair])->LifetimeArrayOrSlice<'_>{
let len=(self.len()+1)/2;
if self.is_range() {
let start=(self.bits&Self::START_MASK) as usize;
let end =start+len;
let x=RSlice::from_slice(&lifetime_indices[start..end]);
LifetimeArrayOrSlice::Slice(x)
}else{
LifetimeArrayOrSlice::Array(ArrayLen{
len:len as u16,
array: LifetimeIndexArray::from_u20(self.bits).to_array(),
})
}
}
}
#[repr(u8)]
#[derive(Debug, Copy, Clone, PartialEq, Eq, StableAbi)]
pub enum LifetimeArrayOrSlice<'a>{
Slice(RSlice<'a,LifetimeIndexPair>),
Array(ArrayLen<[LifetimeIndexPair;3]>),
}
impl<'a> LifetimeArrayOrSlice<'a>{
pub const EMPTY:Self=LifetimeArrayOrSlice::Array(ArrayLen{
len:0,
array:[LifetimeIndexPair::NONE,LifetimeIndexPair::NONE,LifetimeIndexPair::NONE]
});
pub fn as_slice(&self)->&[LifetimeIndexPair]{
match self {
LifetimeArrayOrSlice::Slice(slice)=>{
slice.as_slice()
}
LifetimeArrayOrSlice::Array(arraylen)=>{
&arraylen.array[..arraylen.len as usize]
}
}
}
}
impl<'a> Deref for LifetimeArrayOrSlice<'a>{
type Target=[LifetimeIndexPair];
#[inline]
fn deref(&self)->&[LifetimeIndexPair]{
self.as_slice()
}
}
impl<'a,I,Output:?Sized> Index<I> for LifetimeArrayOrSlice<'a>
where
[LifetimeIndexPair]:Index<I,Output=Output>,
{
type Output=Output;
#[inline]
fn index(&self,i:I)->&Output{
&self.as_slice()[i]
}
}