Rsx children

examples/simple_example.rs

@@ -0,0 +1,21 @@
+use std::sync::Arc;
+
+use osui::prelude::*;
+
+pub fn main() {
+    let engine = Console::new();
+    engine.run(App {}).expect("Failed to run engine");
+}
+
+#[component]
+fn App(cx: &Arc<Context>) -> View {
+    rsx! {
+        MyComponent { "Hello world!" }
+    }
+    .view(cx.clone())
+}
+
+#[component]
+fn MyComponent(cx: &Arc<Context>, children: &Rsx) -> View {
+    children.view(cx.clone())
+}

macros/src/emit.rs

@@ -3,7 +3,11 @@ use proc_macro2::TokenStream;
 use quote::quote;
 
 pub fn emit_rsx(root: RsxRoot) -> TokenStream {
-    let nodes = root.nodes.iter().map(emit_node_scope);
+    emit_rsx_vec(&root.nodes)
+}
+
+pub fn emit_rsx_vec(nodes: &Vec<RsxNode>) -> TokenStream {
+    let nodes = nodes.iter().map(emit_node_scope);
 
     quote! {{
         let mut r = osui::frontend::Rsx::new();
@@ -55,7 +59,7 @@ fn emit_node_scope(node: &RsxNode) -> TokenStream {
             }
         }
 
-        RsxNode::Component(_) => {
+        RsxNode::Component { .. } => {
             let emit = emit_node(node);
             quote! {
                 r.static_scope(move |scope| {#emit});
@@ -125,9 +129,38 @@ fn emit_node(node: &RsxNode) -> TokenStream {
             }));
         },
 
-        RsxNode::Component(expr) => quote! {
-            scope.child(#expr, None);
-        },
+        RsxNode::Component {
+            path,
+            props,
+            children,
+        } => {
+            let prop_inits = props.iter().map(|p| {
+                let name = &p.name;
+                let value = &p.value;
+                quote! { #name: #value }
+            });
+
+            let emit_children = emit_rsx_vec(children);
+
+            let component_expr = if children.len() > 0 {
+                quote! {
+                    #path {
+                        #(#prop_inits,)*
+                        children: #emit_children
+                    }
+                }
+            } else {
+                quote! {
+                    #path {
+                        #(#prop_inits,)*
+                    }
+                }
+            };
+
+            quote! {
+                scope.child(#component_expr, None);
+            }
+        }
 
         RsxNode::Mount(m) => quote! {
             #m.mount();

macros/src/parse.rs

@@ -1,7 +1,8 @@
 use syn::braced;
 use syn::{
-    Expr, Ident, LitStr, Pat, Result, Token,
+    Expr, Ident, LitStr, Pat, Path, Result, Token,
     parse::{Parse, ParseStream},
+    token::Brace,
 };
 
 pub struct RsxRoot {
@@ -18,9 +19,20 @@ impl Parse for RsxRoot {
     }
 }
 
+/// A single prop: `ident: expr`.
+pub struct RsxProp {
+    pub name: Ident,
+    pub value: Expr,
+}
+
 pub enum RsxNode {
     Text(LitStr),
-    Component(Expr),
+    /// Component with optional props and children: `Path { prop: expr, "child", ... }` or bare `Path`.
+    Component {
+        path: Path,
+        props: Vec<RsxProp>,
+        children: Vec<RsxNode>,
+    },
     Mount(Ident),
     If {
         deps: Vec<Dep>,
@@ -116,11 +128,80 @@ impl Parse for RsxNode {
             return Ok(RsxNode::Text(input.parse()?));
         }
 
-        // Component: path (e.g. HelloWorld) or struct init (e.g. HelloWorld { t: 10 })
-        Ok(RsxNode::Component(input.parse()?))
+        // Component: Path or Path { props, children }
+        parse_component_invocation(input)
     }
 }
 
+/// Parses Path or Path { ... } into RsxNode::Component.
+fn parse_component_invocation(input: ParseStream) -> Result<RsxNode> {
+    let path: Path = input.parse()?;
+
+    if !input.peek(Brace) {
+        return Ok(RsxNode::Component {
+            path,
+            props: Vec::new(),
+            children: Vec::new(),
+        });
+    }
+
+    let content;
+    braced!(content in input);
+
+    let (props, children) = parse_props_and_children(&content)?;
+
+    Ok(RsxNode::Component {
+        path,
+        props,
+        children,
+    })
+}
+
+/// Parses comma-separated "ident: expr" (props) and RsxNode (children) inside braces.
+fn parse_props_and_children(input: ParseStream) -> Result<(Vec<RsxProp>, Vec<RsxNode>)> {
+    let mut props = Vec::new();
+    let mut children = Vec::new();
+
+    while !input.is_empty() {
+        if input.peek(LitStr) {
+            children.push(input.parse()?);
+        } else {
+            let path: Path = input.parse()?;
+
+            if input.peek(Token![:]) {
+                let name = path
+                    .get_ident()
+                    .cloned()
+                    .ok_or_else(|| input.error("prop name must be a single identifier"))?;
+                input.parse::<Token![:]>()?;
+                let value: Expr = input.parse()?;
+                props.push(RsxProp { name, value });
+            } else if input.peek(Brace) {
+                let nested_content;
+                braced!(nested_content in input);
+                let (nested_props, nested_children) = parse_props_and_children(&nested_content)?;
+                children.push(RsxNode::Component {
+                    path,
+                    props: nested_props,
+                    children: nested_children,
+                });
+            } else {
+                children.push(RsxNode::Component {
+                    path,
+                    props: Vec::new(),
+                    children: Vec::new(),
+                });
+            }
+        }
+
+        if !input.is_empty() {
+            input.parse::<Token![,]>()?;
+        }
+    }
+
+    Ok((props, children))
+}
+
 fn parse_children(input: ParseStream) -> Result<Vec<RsxNode>> {
     let mut nodes = Vec::new();
     while !input.is_empty() {

src/lib.rs

@@ -11,6 +11,7 @@ pub mod state;
 pub mod prelude {
     pub use crate::component::*;
     pub use crate::engine::*;
+    pub use crate::frontend::*;
     pub use crate::render::*;
     pub use crate::state::*;
     pub use crate::View;

src/state.rs

@@ -115,11 +115,11 @@ impl<T> DerefMut for Inner<'_, T> {
     }
 }
 
-pub trait HookDependency {
+pub trait HookDependency: Send + Sync {
     fn on_update(&self, hook: HookEffect);
 }
 
-impl<T> HookDependency for State<T> {
+impl<T: Send + Sync> HookDependency for State<T> {
     fn on_update(&self, hook: HookEffect) {
         self.dependents.lock().unwrap().push(hook);
     }