yewstack · jstarry · Jun 9, 2020 · May 28, 2020 · May 29, 2020 · May 29, 2020
diff --git a/examples/nested_list/src/item.rs b/examples/nested_list/src/item.rs
@@ -60,7 +60,7 @@ impl ListItem {
 
         html! {
             <div class="list-item-details">
-                { self.props.children.render() }
+                { self.props.children.clone() }
             </div>
         }
     }

diff --git a/yew-functional/src/use_context_hook.rs b/yew-functional/src/use_context_hook.rs
@@ -4,7 +4,7 @@ use std::any::TypeId;
 use std::cell::RefCell;
 use std::rc::{Rc, Weak};
 use std::{iter, mem};
-use yew::html::{AnyScope, Renderable, Scope};
+use yew::html::{AnyScope, Scope};
 use yew::{Children, Component, ComponentLink, Html, Properties};
 
 type ConsumerCallback<T> = Box<dyn Fn(Rc<T>)>;
@@ -83,7 +83,7 @@ impl<T: Clone + 'static> Component for ContextProvider<T> {
     }
 
     fn view(&self) -> Html {
-        self.children.render()
+        self.children.clone().into_iter().collect::<Html>()
     }
 }
 

diff --git a/yew-functional/tests/use_context_hook.rs b/yew-functional/tests/use_context_hook.rs
@@ -6,7 +6,7 @@ wasm_bindgen_test::wasm_bindgen_test_configure!(run_in_browser);
 
 extern crate yew;
 
-use yew::{html, App, Children, Html, Properties, Renderable};
+use yew::{html, App, Children, Html, Properties};
 use yew_functional::{
     use_context, use_effect, use_ref, use_state, ContextProvider, FunctionComponent,
     FunctionProvider,
@@ -198,7 +198,7 @@ fn use_context_update_works() {
                     <div id=props.id.clone()>
                         { format!("total: {}", counter.borrow()) }
                     </div>
-                    { props.children.render() }
+                    { props.children.clone() }
                 </>
             };
         }

diff --git a/yew-macro/src/html_tree/html_block.rs b/yew-macro/src/html_tree/html_block.rs
@@ -1,5 +1,6 @@
 use super::html_iterable::HtmlIterable;
 use super::html_node::HtmlNode;
+use super::ToNodeIterator;
 use crate::PeekValue;
 use proc_macro2::Delimiter;
 use quote::{quote, quote_spanned, ToTokens};
@@ -49,3 +50,15 @@ impl ToTokens for HtmlBlock {
         tokens.extend(quote_spanned! {brace.span=> #new_tokens});
     }
 }
+
+impl ToNodeIterator for HtmlBlock {
+    fn to_node_iterator_stream(&self) -> Option<proc_macro2::TokenStream> {
+        let HtmlBlock { content, brace } = self;
+        let new_tokens = match content {
+            BlockContent::Iterable(iterable) => iterable.to_node_iterator_stream(),
+            BlockContent::Node(node) => node.to_node_iterator_stream(),
+        }?;
+
+        Some(quote_spanned! {brace.span=> #new_tokens})
+    }
+}
diff --git a/yew-macro/src/html_tree/html_component.rs b/yew-macro/src/html_tree/html_component.rs
@@ -1,6 +1,6 @@
+use super::HtmlChildrenTree;
 use super::HtmlProp;
 use super::HtmlPropSuffix;
-use super::HtmlTreeNested;
 use crate::PeekValue;
 use boolinator::Boolinator;
 use proc_macro2::Span;
@@ -19,7 +19,7 @@ use syn::{
 pub struct HtmlComponent {
     ty: Type,
     props: Props,
-    children: Vec<HtmlTreeNested>,
+    children: HtmlChildrenTree,
 }
 
 impl PeekValue<()> for HtmlComponent {
@@ -48,11 +48,11 @@ impl Parse for HtmlComponent {
             return Ok(HtmlComponent {
                 ty: open.ty,
                 props: open.props,
-                children: Vec::new(),
+                children: HtmlChildrenTree::new(),
             });
         }
 
-        let mut children: Vec<HtmlTreeNested> = vec![];
+        let mut children = HtmlChildrenTree::new();
         loop {
             if input.is_empty() {
                 return Err(syn::Error::new_spanned(
@@ -66,7 +66,7 @@ impl Parse for HtmlComponent {
                 }
             }
 
-            children.push(input.parse()?);
+            children.parse_child(input)?;
         }
 
         input.parse::<HtmlComponentClose>()?;
@@ -110,11 +110,7 @@ impl ToTokens for HtmlComponent {
 
         let set_children = if !children.is_empty() {
             quote! {
-                .children(::yew::html::ChildrenRenderer::new({
-                    let mut v = ::std::vec::Vec::new();
-                    #(v.extend(::yew::utils::NodeSeq::from(#children));)*
-                    v
-                }))
+                .children(::yew::html::ChildrenRenderer::new(#children))
             }
         } else {
             quote! {}
@@ -157,7 +153,7 @@ impl ToTokens for HtmlComponent {
         let key = if let Some(key) = props.key() {
             quote_spanned! { key.span()=> Some(#key) }
         } else {
-            quote! {None }
+            quote! {None}
         };
 
         tokens.extend(quote! {{

diff --git a/yew-macro/src/html_tree/html_iterable.rs b/yew-macro/src/html_tree/html_iterable.rs
@@ -1,3 +1,4 @@
+use super::ToNodeIterator;
 use crate::PeekValue;
 use boolinator::Boolinator;
 use proc_macro2::TokenStream;
@@ -39,14 +40,21 @@ impl Parse for HtmlIterable {
 impl ToTokens for HtmlIterable {
     fn to_tokens(&self, tokens: &mut TokenStream) {
         let expr = &self.0;
-        let new_tokens = quote_spanned! {expr.span()=> {
-            let mut __yew_vlist = ::yew::virtual_dom::VList::default();
-            for __yew_node in #expr {
-                __yew_vlist.add_child(__yew_node.into());
-            }
-            ::yew::virtual_dom::VNode::from(__yew_vlist)
-        }};
+        let new_tokens = quote_spanned! {expr.span()=>
+            ::std::iter::Iterator::collect::<::yew::virtual_dom::VNode>(::std::iter::IntoIterator::into_iter(#expr))
+        };
 
         tokens.extend(new_tokens);
     }
 }
+
+impl ToNodeIterator for HtmlIterable {
+    fn to_node_iterator_stream(&self) -> Option<TokenStream> {
+        let Self(expr) = self;
+        // #expr can return anything that implements IntoIterator<Item=Into<T>>
+        // so we generate some extra code to turn it into IntoIterator<Item=T>
+        Some(quote_spanned! {expr.span()=>
+            ::std::iter::Iterator::map(::std::iter::IntoIterator::into_iter(#expr), |n| n.into())
+        })
+    }
+}
diff --git a/yew-macro/src/html_tree/html_list.rs b/yew-macro/src/html_tree/html_list.rs
@@ -1,4 +1,4 @@
-use super::HtmlTree;
+use super::HtmlChildrenTree;
 use crate::html_tree::{HtmlProp, HtmlPropSuffix};
 use crate::PeekValue;
 use boolinator::Boolinator;
@@ -10,8 +10,17 @@ use syn::spanned::Spanned;
 use syn::{Expr, Token};
 
 pub struct HtmlList {
-    pub children: Vec<HtmlTree>,
-    pub key: Option<Expr>,
+    children: HtmlChildrenTree,
+    key: Option<Expr>,
+}
+
+impl HtmlList {
+    pub fn empty() -> Self {
+        Self {
+            children: HtmlChildrenTree::new(),
+            key: None,
+        }
+    }
 }
 
 impl PeekValue<()> for HtmlList {
@@ -42,9 +51,9 @@ impl Parse for HtmlList {
             ));
         }
 
-        let mut children: Vec<HtmlTree> = vec![];
+        let mut children = HtmlChildrenTree::new();
         while HtmlListClose::peek(input.cursor()).is_none() {
-            children.push(input.parse()?);
+            children.parse_child(input)?;
         }
 
         input.parse::<HtmlListClose>()?;
@@ -66,12 +75,7 @@ impl ToTokens for HtmlList {
         };
         tokens.extend(quote! {
             ::yew::virtual_dom::VNode::VList(
-                ::yew::virtual_dom::VList::new_with_children({
-                    let mut v = ::std::vec::Vec::new();
-                    #(v.extend(::yew::utils::NodeSeq::from(#children));)*
-                    v
-                },
-                #key)
+                ::yew::virtual_dom::VList::new_with_children(#children, #key)
             )
         });
     }

diff --git a/yew-macro/src/html_tree/html_node.rs b/yew-macro/src/html_tree/html_node.rs
@@ -1,13 +1,16 @@
+use super::ToNodeIterator;
 use crate::PeekValue;
 use proc_macro2::TokenStream;
 use quote::{quote, quote_spanned, ToTokens};
 use syn::buffer::Cursor;
 use syn::parse::{Parse, ParseStream, Result};
 use syn::spanned::Spanned;
-use syn::Expr;
-use syn::Lit;
+use syn::{Expr, Lit};
 
-pub struct HtmlNode(Node);
+pub enum HtmlNode {
+    Literal(Box<Lit>),
+    Expression(Box<Expr>),
+}
 
 impl Parse for HtmlNode {
     fn parse(input: ParseStream) -> Result<Self> {
@@ -17,12 +20,12 @@ impl Parse for HtmlNode {
                 Lit::Str(_) | Lit::Char(_) | Lit::Int(_) | Lit::Float(_) | Lit::Bool(_) => {}
                 _ => return Err(syn::Error::new(lit.span(), "unsupported type")),
             }
-            Node::Literal(Box::new(lit))
+            HtmlNode::Literal(Box::new(lit))
         } else {
-            Node::Expression(Box::new(input.parse()?))
+            HtmlNode::Expression(Box::new(input.parse()?))
         };
 
-        Ok(HtmlNode(node))
+        Ok(node)
     }
 }
 
@@ -40,22 +43,21 @@ impl PeekValue<()> for HtmlNode {
 
 impl ToTokens for HtmlNode {
     fn to_tokens(&self, tokens: &mut TokenStream) {
-        self.0.to_tokens(tokens);
+        tokens.extend(match &self {
+            HtmlNode::Literal(lit) => quote! {#lit},
+            HtmlNode::Expression(expr) => quote_spanned! {expr.span()=> {#expr}},
+        });
     }
 }
 
-impl ToTokens for Node {
-    fn to_tokens(&self, tokens: &mut TokenStream) {
-        let node_token = match &self {
-            Node::Literal(lit) => quote! {#lit},
-            Node::Expression(expr) => quote_spanned! {expr.span()=> {#expr} },
-        };
-
-        tokens.extend(node_token);
+impl ToNodeIterator for HtmlNode {
+    fn to_node_iterator_stream(&self) -> Option<TokenStream> {
+        match self {
+            HtmlNode::Literal(_) => None,
+            HtmlNode::Expression(expr) => {
+                // NodeSeq turns both Into<T> and Vec<Into<T>> into IntoIterator<Item = T>
+                Some(quote_spanned! {expr.span()=> ::yew::utils::NodeSeq::from(#expr)})
+            }
+        }
     }
 }
-
-enum Node {
-    Literal(Box<Lit>),
-    Expression(Box<Expr>),
-}
diff --git a/yew-macro/src/html_tree/html_tag/mod.rs b/yew-macro/src/html_tree/html_tag/mod.rs
@@ -1,9 +1,9 @@
 mod tag_attributes;
 
+use super::HtmlChildrenTree;
 use super::HtmlDashedName;
 use super::HtmlProp as TagAttribute;
 use super::HtmlPropSuffix as TagSuffix;
-use super::HtmlTree;
 use crate::{non_capitalized_ascii, Peek, PeekValue};
 use boolinator::Boolinator;
 use proc_macro2::{Delimiter, Span};
@@ -18,7 +18,7 @@ use tag_attributes::{ClassesForm, TagAttributes};
 pub struct HtmlTag {
     tag_name: TagName,
     attributes: TagAttributes,
-    children: Vec<HtmlTree>,
+    children: HtmlChildrenTree,
 }
 
 impl PeekValue<()> for HtmlTag {
@@ -47,7 +47,7 @@ impl Parse for HtmlTag {
             return Ok(HtmlTag {
                 tag_name: open.tag_name,
                 attributes: open.attributes,
-                children: Vec::new(),
+                children: HtmlChildrenTree::new(),
             });
         }
 
@@ -66,7 +66,7 @@ impl Parse for HtmlTag {
         }
 
         let open_key = open.tag_name.get_key();
-        let mut children: Vec<HtmlTree> = vec![];
+        let mut children = HtmlChildrenTree::new();
         loop {
             if input.is_empty() {
                 return Err(syn::Error::new_spanned(
@@ -80,7 +80,7 @@ impl Parse for HtmlTag {
                 }
             }
 
-            children.push(input.parse()?);
+            children.parse_child(input)?;
         }
 
         input.parse::<HtmlTagClose>()?;
@@ -244,7 +244,7 @@ impl ToTokens for HtmlTag {
             #(#set_key)*
             #vtag.add_attributes(vec![#(#attr_pairs),*]);
             #vtag.add_listeners(vec![#(::std::rc::Rc::new(#listeners)),*]);
-            #vtag.add_children(vec![#(#children),*]);
+            #vtag.add_children(#children);
             #dyn_tag_runtime_checks
             ::yew::virtual_dom::VNode::from(#vtag)
         }});