xml: Add tag_name extractor

crates/xml/derive/src/de/attrs.rs

@@ -47,6 +47,8 @@ pub enum FieldType {
     Attr,
     Text,
     Untagged,
+    TagName,
+    Namespace,
 }
 
 #[derive(Default, FromField)]

crates/xml/derive/src/de/de_struct.rs

@@ -9,7 +9,7 @@ fn invalid_field_branch(allow: bool) -> proc_macro2::TokenStream {
     if allow {
         quote! {}
     } else {
-        quote! { return Err(XmlDeError::InvalidFieldName) }
+        quote! { return Err(XmlDeError::InvalidFieldName(format!("[{ns:?}]{tag:?}"))) }
     }
 }
 
@@ -80,6 +80,7 @@ impl NamedStruct {
         }
         let text_field_branches = self.fields.iter().filter_map(Field::text_branch);
         let attr_field_branches = self.fields.iter().filter_map(Field::attr_branch);
+        let tagname_field_branches = self.fields.iter().filter_map(Field::tagname_branch);
 
         let builder_field_builds = self.fields.iter().map(Field::builder_field_build);
 
@@ -106,11 +107,14 @@ impl NamedStruct {
                         #(#builder_field_inits),*
                     };
 
+                    let (ns, name) = reader.resolve_element(start.name());
+                    #(#tagname_field_branches);*
+
                     for attr in start.attributes() {
                         let attr = attr?;
                         match attr.key.as_ref() {
                             #(#attr_field_branches),*
-                            _ => { #invalid_field_branch }
+                            _ => { /* ignore */ }
                         }
                     }
 
@@ -129,7 +133,7 @@ impl NamedStruct {
                                     match (ns, name.as_ref()) {
                                         #(#named_field_branches),*
                                         #(#untagged_field_branches),*
-                                        _ => { #invalid_field_branch }
+                                        (ns, tag) => { #invalid_field_branch }
                                     }
                                 }
                                 Event::Text(bytes_text) => {

crates/xml/derive/src/de/field.rs

@@ -219,6 +219,24 @@ impl Field {
         })
     }
 
+    pub fn tagname_branch(&self) -> Option<proc_macro2::TokenStream> {
+        if self.attrs.xml_ty != FieldType::TagName {
+            return None;
+        }
+        let field_ident = self.field_ident();
+
+        let value = wrap_option_if_no_default(
+            quote! {
+            rustical_xml::Value::deserialize(&String::from_utf8_lossy(name.as_ref()))?
+                    },
+            self.attrs.default.is_some(),
+        );
+
+        Some(quote! {
+            builder.#field_ident = #value;
+        })
+    }
+
     pub fn tag_writer(&self) -> Option<proc_macro2::TokenStream> {
         let field_ident = self.field_ident();
         let field_name = self.xml_name();
@@ -235,6 +253,8 @@ impl Field {
                 // TODO: untag!
                 self.#field_ident.serialize(None, writer)?;
             }),
+            // TODO: Think about what to do here
+            FieldType::TagName | FieldType::Namespace => None,
         }
     }
 }

crates/xml/src/de.rs

@@ -29,8 +29,8 @@ pub enum XmlDeError {
     Other(String),
     #[error("Invalid variant: {0}")]
     InvalidVariant(String),
-    #[error("Invalid field name: ")]
-    InvalidFieldName,
+    #[error("Invalid field name: {0}")]
+    InvalidFieldName(String),
     #[error(transparent)]
     InvalidValue(#[from] crate::value::ParseValueError),
 }