use std::fmt;
use std::marker::PhantomData;
use crate::reflection;
use crate::Predicate;
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
inner: M,
name: &'static str,
_phantom: PhantomData<Item>,
}
unsafe impl<M, Item> Send for NamePredicate<M, Item>
where
M: Predicate<Item> + Send,
Item: ?Sized,
{
}
unsafe impl<M, Item> Sync for NamePredicate<M, Item>
where
M: Predicate<Item> + Sync,
Item: ?Sized,
{
}
impl<M, Item> Predicate<Item> for NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
fn eval(&self, item: &Item) -> bool {
self.inner.eval(item)
}
fn find_case<'a>(&'a self, expected: bool, variable: &Item) -> Option<reflection::Case<'a>> {
self.inner
.find_case(expected, variable)
.map(|child_case| reflection::Case::new(Some(self), expected).add_child(child_case))
}
}
impl<M, Item> reflection::PredicateReflection for NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
fn children<'a>(&'a self) -> Box<dyn Iterator<Item = reflection::Child<'a>> + 'a> {
let params = vec![reflection::Child::new(self.name, &self.inner)];
Box::new(params.into_iter())
}
}
impl<M, Item> fmt::Display for NamePredicate<M, Item>
where
M: Predicate<Item>,
Item: ?Sized,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let palette = crate::Palette::new(f.alternate());
write!(f, "{}", palette.description(self.name))
}
}
pub trait PredicateNameExt<Item: ?Sized>
where
Self: Predicate<Item>,
{
fn name(self, name: &'static str) -> NamePredicate<Self, Item>
where
Self: Sized,
{
NamePredicate {
inner: self,
name,
_phantom: PhantomData,
}
}
}
impl<P, Item> PredicateNameExt<Item> for P
where
P: Predicate<Item>,
Item: ?Sized,
{
}