wip: refactored core

crates/tek_core/src/collect.rs

@@ -0,0 +1,41 @@
+use crate::*;
+
+pub enum Collected<'a, T, U> {
+    Box(Box<dyn Render<T, U> + 'a>),
+    Ref(&'a (dyn Render<T, U> + 'a)),
+}
+impl<'a, T, U> Render<T, U> for Collected<'a, T, U> {
+    fn render (&self, to: &mut T) -> Perhaps<U> {
+        match self {
+            Self::Box(item) => (*item).render(to),
+            Self::Ref(item) => (*item).render(to),
+        }
+    }
+}
+pub struct Collection<'a, T, U>(
+    pub Vec<Collected<'a, T, U>>
+);
+impl<'a, T, U> Collection<'a, T, U> {
+    pub fn new () -> Self {
+        Self(vec![])
+    }
+}
+pub trait Collect<'a, T, U> {
+    fn add_box (self, item: Box<dyn Render<T, U> + 'a>) -> Self;
+    fn add_ref (self, item: &'a dyn Render<T, U>) -> Self;
+    fn add <R: Render<T, U> + Sized + 'a> (self, item: R) -> Self
+        where Self: Sized
+    {
+        self.add_box(Box::new(item))
+    }
+}
+impl<'a, T, U> Collect<'a, T, U> for Collection<'a, T, U> {
+    fn add_box (mut self, item: Box<dyn Render<T, U> + 'a>) -> Self {
+        self.0.push(Collected::Box(item));
+        self
+    }
+    fn add_ref (mut self, item: &'a dyn Render<T, U>) -> Self {
+        self.0.push(Collected::Ref(item));
+        self
+    }
+}