forked from hydro-project/hydroflow
/
filter.rs
96 lines (85 loc) · 2.4 KB
/
filter.rs
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use super::{BaseSurface, PullSurface, PushSurface, PushSurfaceReversed};
use crate::builder::build::pull_filter::FilterPullBuild;
use crate::builder::build::push_filter::FilterPushBuild;
pub struct FilterSurface<Prev, Func>
where
Prev: BaseSurface,
{
prev: Prev,
func: Func,
}
impl<Prev, Func> FilterSurface<Prev, Func>
where
Prev: BaseSurface,
Func: FnMut(&Prev::ItemOut) -> bool,
{
pub fn new(prev: Prev, func: Func) -> Self {
Self { prev, func }
}
}
impl<Prev, Func> BaseSurface for FilterSurface<Prev, Func>
where
Prev: BaseSurface,
Func: FnMut(&Prev::ItemOut) -> bool,
{
type ItemOut = Prev::ItemOut;
}
impl<Prev, Func> PullSurface for FilterSurface<Prev, Func>
where
Prev: PullSurface,
Func: FnMut(&Prev::ItemOut) -> bool,
{
type InputHandoffs = Prev::InputHandoffs;
type Build = FilterPullBuild<Prev::Build, Func>;
fn into_parts(self) -> (Self::InputHandoffs, Self::Build) {
let (connect, build) = self.prev.into_parts();
let build = FilterPullBuild::new(build, self.func);
(connect, build)
}
}
impl<Prev, Func> PushSurface for FilterSurface<Prev, Func>
where
Prev: PushSurface,
Func: FnMut(&Prev::ItemOut) -> bool,
{
type Output<Next> = Prev::Output<FilterPushSurfaceReversed<Next, Func>>
where
Next: PushSurfaceReversed<ItemIn = Self::ItemOut>;
fn push_to<Next>(self, next: Next) -> Self::Output<Next>
where
Next: PushSurfaceReversed<ItemIn = Self::ItemOut>,
{
self.prev
.push_to(FilterPushSurfaceReversed::new(next, self.func))
}
}
pub struct FilterPushSurfaceReversed<Next, Func>
where
Next: PushSurfaceReversed,
{
next: Next,
func: Func,
}
impl<Next, Func> FilterPushSurfaceReversed<Next, Func>
where
Next: PushSurfaceReversed,
Func: FnMut(&Next::ItemIn) -> bool,
{
pub fn new(next: Next, func: Func) -> Self {
Self { next, func }
}
}
impl<Next, Func> PushSurfaceReversed for FilterPushSurfaceReversed<Next, Func>
where
Next: PushSurfaceReversed,
Func: FnMut(&Next::ItemIn) -> bool,
{
type ItemIn = Next::ItemIn;
type OutputHandoffs = Next::OutputHandoffs;
type Build = FilterPushBuild<Next::Build, Func>;
fn into_parts(self) -> (Self::OutputHandoffs, Self::Build) {
let (connect, build) = self.next.into_parts();
let build = FilterPushBuild::new(build, self.func);
(connect, build)
}
}