Merge #52

52: edit to #49 r=Emilgardis a=Emilgardis

Author: bors[bot]

src/lib.rs

@@ -178,6 +178,17 @@ pub struct Peripheral {
 }
 
 impl Peripheral {
+    pub fn derive_from(&self, other: &Peripheral) -> Peripheral {
+        let mut derived = self.clone();
+        derived.group_name = derived.group_name.or(other.group_name.clone());
+        derived.description = derived.description.or(other.description.clone());
+        derived.registers = derived.registers.or(other.registers.clone());
+        if derived.interrupt.is_empty() {
+            derived.interrupt = other.interrupt.clone();
+        }
+        derived
+    }
+
     fn parse(tree: &Element) -> Peripheral {
         assert_eq!(tree.name, "peripheral");