Parse raw elements, attributes, and web components in rsx (#2655)

* parse raw elements and attributes in rsx

---------

Co-authored-by: Jonathan Kelley <jkelleyrtp@gmail.com>

packages/rsx/src/util.rs

@@ -5,6 +5,11 @@ use internment::Intern;
 
 use proc_macro2::TokenStream as TokenStream2;
 use std::{fmt::Debug, hash::Hash};
+use syn::{
+    ext::IdentExt,
+    parse::{Parse, ParseBuffer},
+    Ident,
+};
 
 /// interns a object into a static object, resusing the value if it already exists
 #[cfg(feature = "hot_reload")]
@@ -27,3 +32,14 @@ impl PrettyUnparse for TokenStream2 {
         prettier_please::unparse_expr(&parsed)
     }
 }
+
+/// Parse a raw ident and return a new ident with the r# prefix added
+pub fn parse_raw_ident(parse_buffer: &ParseBuffer) -> syn::Result<Ident> {
+    // First try to parse as a normal ident
+    if let Ok(ident) = Ident::parse(parse_buffer) {
+        return Ok(ident);
+    }
+    // If that fails, try to parse as a raw ident
+    let ident = Ident::parse_any(parse_buffer)?;
+    Ok(Ident::new_raw(&ident.to_string(), ident.span()))
+}