edn -> dsl

output/src/output.rs

@@ -20,6 +20,7 @@ pub trait Output: Send + Sync + Sized {
     #[inline] fn h (&self) -> Self::Unit { self.area().h() }
     #[inline] fn wh (&self) -> Self::Size { self.area().wh().into() }
 }
+
 /// Renderable with dynamic dispatch.
 pub trait Render<E: Output> {
     /// Compute layout.
@@ -31,6 +32,7 @@ pub trait Render<E: Output> {
         Box::new(self) as RenderBox<'a, E>
     }
 }
+
 /// Most importantly, every [Content] is also a [Render].
 ///
 /// However, the converse does not hold true.
@@ -40,17 +42,21 @@ impl<E: Output, C: Content<E>> Render<E> for C {
     fn layout (&self, area: E::Area) -> E::Area { Content::layout(self, area) }
     fn render (&self, output: &mut E) { Content::render(self, output) }
 }
+
 /// Opaque pointer to a renderable living on the heap.
 ///
 /// Return this from [Content::content] to use dynamic dispatch.
 pub type RenderBox<'a, E> = Box<RenderDyn<'a, E>>;
+
 /// You can render from a box.
 impl<'a, E: Output> Content<E> for RenderBox<'a, E> {
     fn content (&self) -> impl Render<E> { self.deref() }
     //fn boxed <'b> (self) -> RenderBox<'b, E> where Self: Sized + 'b { self }
 }
+
 /// Opaque pointer to a renderable.
 pub type RenderDyn<'a, E> = dyn Render<E> + Send + Sync + 'a;
+
 /// You can render from an opaque pointer.
 impl<'a, E: Output> Content<E> for &RenderDyn<'a, E> where Self: Sized {
     fn content (&self) -> impl Render<E> {
@@ -66,6 +72,7 @@ impl<'a, E: Output> Content<E> for &RenderDyn<'a, E> where Self: Sized {
         Render::render(self.deref(), output)
     }
 }
+
 /// Composable renderable with static dispatch.
 pub trait Content<E: Output> {
     /// Return a [Render]able of a specific type.
@@ -75,17 +82,20 @@ pub trait Content<E: Output> {
     /// Draw to output. By default, delegates to [Self::content].
     fn render (&self, output: &mut E) { self.content().render(output) }
 }
+
 /// Every pointer to [Content] is a [Content].
 impl<E: Output, C: Content<E>> Content<E> for &C {
     fn content (&self) -> impl Render<E> { (*self).content() }
     fn layout (&self, area: E::Area) -> E::Area { (*self).layout(area) }
     fn render (&self, output: &mut E) { (*self).render(output) }
 }
+
 /// The platonic ideal unit of [Content]: total emptiness at dead center (e=1vg^sqrt(-1))
 impl<E: Output> Content<E> for () {
     fn layout (&self, area: E::Area) -> E::Area { area.center().to_area_pos().into() }
     fn render (&self, _: &mut E) {}
 }
+
 impl<E: Output, T: Content<E>> Content<E> for Option<T> {
     fn content (&self) -> impl Render<E> {
         self.as_ref()
@@ -100,6 +110,7 @@ impl<E: Output, T: Content<E>> Content<E> for Option<T> {
             .map(|content|content.render(output));
     }
 }
+
 /// Implement [Content] with composable content for a struct.
 #[macro_export] macro_rules! content {
     // Implement for all [Output]s.
@@ -119,6 +130,7 @@ impl<E: Output, T: Content<E>> Content<E> for Option<T> {
         }
     };
 }
+
 /// Implement [Content] with custom rendering for a struct.
 #[macro_export] macro_rules! render {
     (|$self:ident:$Struct:ident $(<