add(converter): support value under register, by inserting field during conversion

src/converter.rs

@@ -389,11 +389,19 @@ impl Register {
             .transpose()?;
         let desc = node.attribute("desc").map(str::to_string);
 
-        let children: Vec<_> = node
-            .children()
-            .filter(|node| node.is_element() && node.tag_name().name().eq("field"))
+        let children: Vec<_> = {
+            let mut child_elements = node.children().filter(|node| node.is_element());
+            if child_elements.any(|node| node.tag_name().name().eq("value")) {
+                // Generate virtual single field under the register, to absorb difference between
+                // normal format
+                vec![Field::from_xml_register_dom(node)?]
+            } else {
+                child_elements
+                    .filter(|node| node.tag_name().name().eq("field"))
                     .map(Field::from_xml_dom)
-            .collect::<Result<_, _>>()?;
+                    .collect::<Result<_, _>>()?
+            }
+        };
 
         // Validation
         if default.is_some() && !children.is_empty() {
@@ -505,6 +513,45 @@ impl Field {
             elements: children,
         })
     }
+
+    /// Generate Field from Registers (piracy), guessing a lot of parameters.
+    pub(crate) fn from_xml_register_dom(node: Node) -> Result<Self, DomConversionError> {
+        let name = util::get_name(node)?;
+        let mask = node
+            .ancestors()
+            .filter_map(|node| util::get_type(node))
+            .next()
+            .transpose()?
+            .map_or_else(
+                || Err(DomConversionError::parameter_completion_error("type", node)),
+                |dtype| match dtype {
+                    crate::types::DataType::D32 => Ok(u32::MAX),
+                },
+            )?;
+        if node.has_attribute("default") {
+            return Err(DomConversionError::other_error(
+                "unsupported structure: register with @default without field",
+                node,
+            ));
+        }
+        let desc = node.attribute("desc").map(str::to_string);
+        let children = node
+            .children()
+            .filter(|node| node.is_element())
+            .map(Value::from_xml_dom)
+            .collect::<Result<_, _>>()?;
+
+        Ok(Field {
+            name,
+            mask,
+            interface: None,
+            multiple: None,
+            default: None,
+            sclr: None,
+            desc,
+            elements: children,
+        })
+    }
 }
 
 impl Value {