Fix attribute-metadata parsing and serde rename-rule parity (for rpc-toolkit TS bindings)

visit-rs-derive/Cargo.toml

@@ -3,7 +3,7 @@ description = "Procedural macros for visit-rs"
 edition = "2024"
 license = "MIT"
 name = "visit-rs-derive"
-version = "0.1.7"
+version = "0.1.8"
 
 [lib]
 proc-macro = true

visit-rs-derive/src/attrs.rs

@@ -1,6 +1,7 @@
 use proc_macro2::TokenStream;
 use quote::{ToTokens, quote};
-use syn::{Attribute, Expr, Lit, Meta};
+use syn::punctuated::Punctuated;
+use syn::{Attribute, Expr, Lit, Meta, Token};
 
 /// Parse syn::Meta into our AttributeMeta representation
 fn parse_meta_to_attribute_meta(meta: &Meta) -> TokenStream {
@@ -15,23 +16,24 @@ fn parse_meta_to_attribute_meta(meta: &Meta) -> TokenStream {
         }
         Meta::List(list) => {
             let path_str = list.path.to_token_stream().to_string();
-            let tokens_str = list.tokens.to_string();
 
-            // Try to parse the list contents
-            if let Ok(nested_meta) = syn::parse2::<Meta>(list.tokens.clone()) {
-                let nested = parse_meta_to_attribute_meta(&nested_meta);
-                quote! {
-                    visit_rs::metadata::AttributeMeta::List {
-                        path: #path_str,
-                        items: &[#nested],
+            match list.parse_args_with(Punctuated::<Meta, Token![,]>::parse_terminated) {
+                Ok(nested) => {
+                    let items = nested.iter().map(parse_meta_to_attribute_meta);
+                    quote! {
+                        visit_rs::metadata::AttributeMeta::List {
+                            path: #path_str,
+                            items: &[#(#items),*],
+                        }
                     }
                 }
-            } else {
-                // Fallback to unparsed
-                quote! {
-                    visit_rs::metadata::AttributeMeta::Unparsed {
-                        path: #path_str,
-                        tokens: #tokens_str,
+                Err(_) => {
+                    let tokens_str = list.tokens.to_string();
+                    quote! {
+                        visit_rs::metadata::AttributeMeta::Unparsed {
+                            path: #path_str,
+                            tokens: #tokens_str,
+                        }
                     }
                 }
             }