remove View; allow rendering Result

dsl/src/dsl_provide.rs

@@ -16,19 +16,35 @@ use crate::*;
 
 /// Maps a sequencer of EDN tokens to parameters of supported types
 /// for a given context.
-pub trait Dsl<U>: Sized {
-    fn take <'state, 'source> (
-        &'state self,
-        _: &mut TokenIter<'source>
-    ) -> Perhaps<U> {
+pub trait Dsl<Value>: Sized {
+    fn take <'state, 'source> (&'state self, _: &mut TokenIter<'source>) -> Perhaps<Value> {
         unimplemented!()
     }
     fn take_or_fail <'state, 'source> (
         &'state self,
         token: &mut TokenIter<'source>,
         error: impl Into<Box<dyn std::error::Error>>
-    ) -> Usually<U> {
-        if let Some(value) = Dsl::<U>::take(self, token)? {
+    ) -> Usually<Value> {
+        if let Some(value) = Dsl::<Value>::take(self, token)? {
+            Ok(value)
+        } else {
+            Result::Err(error.into())
+        }
+    }
+}
+
+pub trait FromDsl<'state, State>: Sized {
+    fn take_from <'source: 'state> (state: &'state State, _token: &mut TokenIter<'source>)
+        -> Perhaps<Self>
+    {
+        unimplemented!()
+    }
+    fn take_from_or_fail <'source: 'state> (
+        state: &'state State,
+        token: &mut TokenIter<'source>,
+        error: impl Into<Box<dyn std::error::Error>>
+    ) -> Usually<Self> {
+        if let Some(value) = FromDsl::<State>::take_from(state, token)? {
             Ok(value)
         } else {
             Result::Err(error.into())
@@ -53,23 +69,3 @@ impl<'state, X, Y> Dsl<X> for Y where Y: FromDsl<'state, X> {
 
 //impl<T, U: FromDsl<T>> Dsl<U> for T {
 //}
-
-pub trait FromDsl<'state, T>: Sized {
-    fn take_from <'source: 'state> (
-        state: &'state T,
-        _token: &mut TokenIter<'source>
-    ) -> Perhaps<Self> {
-        unimplemented!()
-    }
-    fn take_from_or_fail <'source: 'state> (
-        state: &'state T,
-        token: &mut TokenIter<'source>,
-        error: impl Into<Box<dyn std::error::Error>>
-    ) -> Usually<Self> {
-        if let Some(value) = FromDsl::<T>::take_from(state, token)? {
-            Ok(value)
-        } else {
-            Result::Err(error.into())
-        }
-    }
-}

output/src/space/measure.rs

@@ -85,7 +85,7 @@ impl<E: Output> Measure<E> {
     pub fn format (&self) -> Arc<str> {
         format!("{}x{}", self.w(), self.h()).into()
     }
-    pub fn of <T: Content<E>> (&self, item: T) -> Bsp<Fill<&Self>, T> {
+    pub fn of <T: Render<E>> (&self, item: T) -> Bsp<Fill<&Self>, T> {
         Bsp::b(Fill::xy(self), item)
     }
 }

output/src/view.rs

@@ -1,47 +1,12 @@
 use crate::*;
 
-#[macro_export] macro_rules! view {
-    ($Output:ty: |$self:ident: $State:ty| $expr:expr; {
-        $($sym:literal => $body:expr),* $(,)?
-    }) => {
-        impl Content<$Output> for $State {
-            fn content (&$self) -> impl Render<$Output> { $expr }
-        }
-        impl<'a> ViewContext<'a, $Output> for $State {
-            fn get_content_sym (&'a $self, iter: &Value<'a>) -> Perhaps<RenderBox<'a, $Output>> {
-                Ok(if let Value::Sym(s) = value {
-                    match *s {
-                        $($sym => Some($body.boxed()),)*
-                        _ => None
-                    }
-                } else {
-                    return Err(format!("expected content, got: {iter:?}").into())
-                })
-            }
-        }
-    }
-}
-
-// An ephemeral wrapper around view state and view description,
-// that is meant to be constructed and returned from [Content::content].
 #[cfg(feature = "dsl")]
-pub struct View<'a, T>(
-    pub &'a T,
-    pub TokenIter<'a>
-);
-
-#[cfg(feature = "dsl")]
-impl<'a, O: Output + 'a, T: ViewContext<'a, O>> Content<O> for View<'a, T> {
-    fn content (&self) -> impl Render<O> {
-        let mut iter = self.1.clone();
-        while let Some(Token { value, .. }) = iter.peek() {
-            if let Ok(Some(content)) = self.0.get_content(&mut iter) {
-                return Some(content)
-                // TODO handle errors here, how?
-                // error receiver trait in viewcontext?
-            }
+#[macro_export] macro_rules! try_delegate {
+    ($s:ident, $dsl:expr, $T:ty) => {
+        let value: Option<$T> = FromDsl::take_from($s, $dsl)?;
+        if let Some(value) = value {
+            return Ok(Some(value.boxed()))
         }
-        return None
     }
 }
 
@@ -96,13 +61,3 @@ pub trait ViewContext<'state, E: Output + 'state>: Send + Sync
         Ok(None)
     }
 }
-
-#[cfg(feature = "dsl")]
-#[macro_export] macro_rules! try_delegate {
-    ($s:ident, $dsl:expr, $T:ty) => {
-        let value: Option<$T> = FromDsl::take_from($s, $dsl)?;
-        if let Some(value) = value {
-            return Ok(Some(value.boxed()))
-        }
-    }
-}

proc/src/proc_view.rs

@@ -44,7 +44,7 @@ impl Parse for ViewImpl {
 impl ToTokens for ViewDef {
     fn to_tokens (&self, out: &mut TokenStream2) {
         let Self(ViewMeta { output }, ViewImpl { block, exposed }) = self;
-        let ident = &block.self_ty;
+        let view = &block.self_ty;
         let mut available = vec![];
         let exposed: Vec<_> = exposed.iter().map(|(k,v)|{
             available.push(k.clone());
@@ -52,24 +52,24 @@ impl ToTokens for ViewDef {
         }).collect();
         let available: String = available.join(", ");
         let error_msg = LitStr::new(
-            &format!("expected Sym(content), got: {{iter:?}}, available: {available}"),
+            &format!("expected Sym(content), got: {{token:?}}, available: {available}"),
             Span::call_site()
         );
         for token in quote! {
             #block
             /// Generated by [tengri_proc].
-            impl ::tengri::output::Content<#output> for #ident {
+            impl ::tengri::output::Content<#output> for #view {
                 fn content (&self) -> impl Render<#output> {
-                    // TODO move to self.view()
-                    self.size.of(::tengri::output::View(self, self.config.view))
+                    self.view()
                 }
             }
             /// Generated by [tengri_proc].
-            impl<'state> ::tengri::output::ViewContext<'state, #output> for #ident {
-                fn get_content_sym <'source: 'state> (&'state self, iter: &mut TokenIter<'source>)
-                    -> ::tengri::Perhaps<RenderBox<'state, #output>>
-                {
-                    Ok(match iter.peek() { #(#exposed)* _ => panic!(#error_msg) })
+            impl<'state> ::tengri::dsl::FromDsl<'state, #view> for ::tengri::output::RenderBox<'state, #output> {
+                fn take_from <'source: 'state> (
+                    state: &'state #view,
+                    token: &mut ::tengri::dsl::TokenIter<'source>
+                ) -> Perhaps<Self> {
+                    Ok(match token.peek() { #(#exposed)* _ => None })
                 }
             }
         } {
@@ -126,7 +126,7 @@ impl ToTokens for ViewArm {
         out.append(Ident::new("Some", Span::call_site()));
         out.append(Group::new(Delimiter::Parenthesis, {
             let mut out = TokenStream2::new();
-            out.append(Ident::new("self", Span::call_site()));
+            out.append(Ident::new("state", Span::call_site()));
             out.append(Punct::new('.', Alone));
             out.append(value.clone());
             out.append(Group::new(Delimiter::Parenthesis, TokenStream2::new()));

tui/src/tui_content.rs

@@ -21,6 +21,30 @@ impl<T: Content<TuiOut>> Content<TuiOut> for std::sync::Arc<T> {
     }
 }
 
+impl<T: Content<TuiOut>> Content<TuiOut> for Result<T, Box<dyn std::error::Error>> {
+    fn content (&self) -> impl Render<TuiOut> {
+        Bsp::a(self.as_ref().ok(), self.as_ref().err()
+            .map(|e|Tui::fg_bg(Color::Rgb(255,255,255), Color::Rgb(32,32,32), e.to_string())))
+    }
+}
+
+//impl<T: Render<TuiOut>> Render<TuiOut> for Result<T, Box<dyn std::error::Error>> {
+    //fn layout (&self, to: [u16;4]) -> [u16;4] {
+        //match self {
+            //Ok(content) => content.layout(to),
+            //Err(e) => [0, 0, to.w(), to.h()]
+        //}
+    //}
+    //fn render (&self, to: &mut TuiOut) {
+        //match self {
+            //Ok(content) => content.render(to),
+            //Err(e) => to.blit(&e.to_string(), 0, 0, Some(Style::default()
+                //.bg(Color::Rgb(32,32,32))
+                //.fg(Color::Rgb(255,255,255))))
+        //}
+    //}
+//}
+
 mod tui_border;   pub use self::tui_border::*;
 mod tui_button;   pub use self::tui_button::*;
 mod tui_color;    pub use self::tui_color::*;