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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
use bitmaps::Bits;
use core::iter;
use ::arbitrary::{size_hint, Arbitrary, Result, Unstructured};
use crate::{types::ChunkLength, Chunk, InlineArray, SparseChunk};
#[cfg(feature = "ringbuffer")]
use crate::RingBuffer;
fn empty<T: 'static>() -> Box<dyn Iterator<Item = T>> {
Box::new(iter::empty())
}
fn shrink_collection<T: Clone, A: Arbitrary>(
entries: impl Iterator<Item = T>,
f: impl Fn(&T) -> Box<dyn Iterator<Item = A>>,
) -> Box<dyn Iterator<Item = Vec<A>>> {
let entries: Vec<_> = entries.collect();
if entries.is_empty() {
return empty();
}
let mut shrinkers: Vec<Vec<_>> = vec![];
let mut i = entries.len();
loop {
shrinkers.push(entries.iter().take(i).map(&f).collect());
i /= 2;
if i == 0 {
break;
}
}
Box::new(iter::once(Vec::new()).chain(iter::from_fn(move || loop {
let mut shrinker = shrinkers.pop()?;
let x: Option<Vec<A>> = shrinker.iter_mut().map(|s| s.next()).collect();
if x.is_none() {
continue;
}
shrinkers.push(shrinker);
return x;
})))
}
impl<A, N> Arbitrary for Chunk<A, N>
where
A: Arbitrary,
N: ChunkLength<A> + 'static,
{
fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
u.arbitrary_iter()?.take(Self::CAPACITY).collect()
}
fn arbitrary_take_rest(u: Unstructured<'_>) -> Result<Self> {
u.arbitrary_take_rest_iter()?.take(Self::CAPACITY).collect()
}
fn size_hint(depth: usize) -> (usize, Option<usize>) {
size_hint::recursion_guard(depth, |depth| {
let (_, upper) = A::size_hint(depth);
(0, upper.map(|upper| upper * Self::CAPACITY))
})
}
fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
let collections = shrink_collection(self.iter(), |x| x.shrink());
Box::new(collections.map(|entries| entries.into_iter().collect()))
}
}
#[cfg(feature = "ringbuffer")]
impl<A, N> Arbitrary for RingBuffer<A, N>
where
A: Arbitrary,
N: ChunkLength<A> + 'static,
{
fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
u.arbitrary_iter()?.take(Self::CAPACITY).collect()
}
fn arbitrary_take_rest(u: Unstructured<'_>) -> Result<Self> {
u.arbitrary_take_rest_iter()?.take(Self::CAPACITY).collect()
}
fn size_hint(depth: usize) -> (usize, Option<usize>) {
size_hint::recursion_guard(depth, |depth| {
let (_, upper) = A::size_hint(depth);
(0, upper.map(|upper| upper * Self::CAPACITY))
})
}
fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
let collections = shrink_collection(self.iter(), |x| x.shrink());
Box::new(collections.map(|entries| entries.into_iter().collect()))
}
}
impl<A, N> Arbitrary for SparseChunk<A, N>
where
A: Clone,
Option<A>: Arbitrary,
N: ChunkLength<A> + Bits + 'static,
{
fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
u.arbitrary_iter()?.take(Self::CAPACITY).collect()
}
fn arbitrary_take_rest(u: Unstructured<'_>) -> Result<Self> {
u.arbitrary_take_rest_iter()?.take(Self::CAPACITY).collect()
}
fn size_hint(depth: usize) -> (usize, Option<usize>) {
size_hint::recursion_guard(depth, |depth| {
let (_, upper) = Option::<A>::size_hint(depth);
(0, upper.map(|upper| upper * Self::CAPACITY))
})
}
fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
let collections = shrink_collection(self.clone().option_drain(), |x| x.shrink());
Box::new(collections.map(|entries| entries.into_iter().collect()))
}
}
impl<A, T> Arbitrary for InlineArray<A, T>
where
A: Arbitrary,
T: 'static,
{
fn arbitrary(u: &mut Unstructured<'_>) -> Result<Self> {
u.arbitrary_iter()?.take(Self::CAPACITY).collect()
}
fn arbitrary_take_rest(u: Unstructured<'_>) -> Result<Self> {
u.arbitrary_take_rest_iter()?.take(Self::CAPACITY).collect()
}
fn size_hint(depth: usize) -> (usize, Option<usize>) {
size_hint::recursion_guard(depth, |depth| {
let (_, upper) = A::size_hint(depth);
(0, upper.map(|upper| upper * Self::CAPACITY))
})
}
fn shrink(&self) -> Box<dyn Iterator<Item = Self>> {
let collections = shrink_collection(self.iter(), |x| x.shrink());
Box::new(collections.map(|entries| entries.into_iter().collect()))
}
}
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