fix: fix nesting struct parsing bug

issue #192

Signed-off-by: limingyi <lessu@163.com>

yaserde_derive/src/de/expand_struct.rs

@@ -7,6 +7,7 @@ use syn::{DataStruct, Generics, Ident};
 pub fn parse(
   data_struct: &DataStruct,
   name: &Ident,
+  root_namespace: &str,
   root: &str,
   root_attributes: &YaSerdeAttribute,
   generics: &Generics,
@@ -419,13 +420,13 @@ pub fn parse(
           );
           match event {
             ::yaserde::__xml::reader::XmlEvent::StartElement{ref name, ref attributes, ..} => {
-              if depth == 0 && name.local_name == #root {
+              let namespace = name.namespace.clone().unwrap_or_default();
+              if depth == 0 && name.local_name == #root && namespace.as_str() == #root_namespace {
                 // Consume root element. We must do this first. In the case it shares a name with a child element, we don't
                 // want to prematurely match the child element below.
                 let event = reader.next_event()?;
                 #write_unused
               } else {
-                let namespace = name.namespace.clone().unwrap_or_default();
 
                 match (namespace.as_str(), name.local_name.as_str()) {
                   #call_visitors

yaserde_derive/src/de/mod.rs

@@ -14,16 +14,28 @@ pub fn expand_derive_deserialize(ast: &syn::DeriveInput) -> Result<TokenStream,
 
   let root_attributes = YaSerdeAttribute::parse(attrs);
 
-  let root_name = format!(
-    "{}{}",
-    root_attributes.prefix_namespace(),
-    root_attributes.xml_element_name(name)
-  );
+  let root_name = root_attributes.xml_element_name(name);
+  let root_namespace = root_attributes
+    .namespaces
+    .iter()
+    .find_map(|(prefix, namespace)| {
+      if root_attributes.prefix.eq(prefix) {
+        Some(namespace.clone())
+      } else {
+        None
+      }
+    })
+    .unwrap_or_default();
 
   let impl_block = match *data {
-    syn::Data::Struct(ref data_struct) => {
-      expand_struct::parse(data_struct, name, &root_name, &root_attributes, generics)
-    }
+    syn::Data::Struct(ref data_struct) => expand_struct::parse(
+      data_struct,
+      name,
+      &root_namespace,
+      &root_name,
+      &root_attributes,
+      generics,
+    ),
     syn::Data::Enum(ref data_enum) => {
       expand_enum::parse(data_enum, name, &root_name, &root_attributes, generics)
     }