Inline get_meta_items()

instant-xml-macros/src/lib.rs

@@ -5,34 +5,34 @@ use quote::quote;
 use syn::{parse_macro_input, DeriveInput, Lit, Meta, NestedMeta};
 
 fn retrieve_default_namespace(input: &DeriveInput) -> Option<String> {
-    if let NestedMeta::Meta(Meta::List(list)) = get_meta_items(&input.attrs).first()? {
+    for attr in &input.attrs {
+        if !attr.path.is_ident(XML) {
+            continue;
+        }
+
+        let nested = match attr.parse_meta() {
+            Ok(Meta::List(meta)) => meta.nested,
+            Ok(_) => todo!(),
+            _ => todo!(),
+        };
+
+        let list = match nested.first() {
+            Some(NestedMeta::Meta(Meta::List(list))) => list,
+            _ => todo!(),
+        };
+
         if list.path.get_ident()? == "namespace" {
             if let NestedMeta::Lit(Lit::Str(v)) = list.nested.first()? {
                 return Some(v.value());
             }
         }
     }
+
     None
 }
 
 const XML: &str = "xml";
 
-pub(crate) fn get_meta_items(attrs: &[syn::Attribute]) -> Vec<NestedMeta> {
-    let mut out = Vec::new();
-    for attr in attrs {
-        if !attr.path.is_ident(XML) {
-            continue;
-        }
-
-        match attr.parse_meta() {
-            Ok(Meta::List(meta)) => out.extend(meta.nested.into_iter()),
-            Ok(_) => todo!(),
-            _ => todo!(),
-        }
-    }
-    out
-}
-
 #[proc_macro_derive(ToXml, attributes(xml))]
 pub fn to_xml(input: TokenStream) -> TokenStream {
     let ast = parse_macro_input!(input as syn::DeriveInput);