Implement dynamic tags

yew-macro/src/html_tree/html_component.rs

@@ -155,7 +155,7 @@ impl ToTokens for HtmlComponent {
         };
 
         let key = if let Some(key) = props.key() {
-            quote_spanned! { key.span() => Some(#key) }
+            quote_spanned! { key.span()=> Some(#key) }
         } else {
             quote! {None }
         };

yew-macro/src/html_tree/html_dashed_name.rs

@@ -9,7 +9,7 @@ use syn::ext::IdentExt;
 use syn::parse::{Parse, ParseStream, Result as ParseResult};
 use syn::Token;
 
-#[derive(PartialEq)]
+#[derive(Clone, PartialEq)]
 pub struct HtmlDashedName {
     pub name: Ident,
     pub extended: Vec<(Token![-], Ident)>,
@@ -22,6 +22,12 @@ impl HtmlDashedName {
             extended: Vec::new(),
         }
     }
+
+    pub fn to_ascii_lowercase_string(&self) -> String {
+        let mut s = self.to_string();
+        s.make_ascii_lowercase();
+        s
+    }
 }
 
 impl fmt::Display for HtmlDashedName {

yew-macro/src/html_tree/html_list.rs

@@ -28,7 +28,7 @@ impl Parse for HtmlList {
             return match input.parse::<HtmlListClose>() {
                 Ok(close) => Err(syn::Error::new_spanned(
                     close,
-                    "this closing tag has no corresponding opening tag",
+                    "this closing fragment has no corresponding opening fragment",
                 )),
                 Err(err) => Err(err),
             };
@@ -38,7 +38,7 @@ impl Parse for HtmlList {
         if !HtmlList::verify_end(input.cursor()) {
             return Err(syn::Error::new_spanned(
                 open,
-                "this opening tag has no corresponding closing tag",
+                "this opening fragment has no corresponding closing fragment",
             ));
         }
 
@@ -60,9 +60,9 @@ impl ToTokens for HtmlList {
     fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
         let children = &self.children;
         let key = if let Some(key) = &self.key {
-            quote_spanned! {key.span() => Some(#key)}
+            quote_spanned! {key.span()=> Some(#key)}
         } else {
-            quote! {None }
+            quote! {None}
         };
         tokens.extend(quote! {
             ::yew::virtual_dom::VNode::VList(

yew-macro/src/html_tree/html_prop.rs

@@ -20,9 +20,15 @@ impl PeekValue<()> for HtmlProp {
 impl Parse for HtmlProp {
     fn parse(input: ParseStream) -> ParseResult<Self> {
         let label = input.parse::<HtmlPropLabel>()?;
-        input
+        let equals = input
             .parse::<Token![=]>()
             .map_err(|_| syn::Error::new_spanned(&label, "this prop doesn't have a value"))?;
+        if input.is_empty() {
+            return Err(syn::Error::new_spanned(
+                equals,
+                "expected an expression following this equals sign",
+            ));
+        }
         let value = input.parse::<Expr>()?;
         // backwards compat
         let _ = input.parse::<Token![,]>();