Merge pull request #28 from jgennis/local-variant
Add CreateLocalVariations to BottupUpMutatorContext.
diff --git a/proptools/proptools.go b/proptools/proptools.go
index 4868408..2a71ea1 100644
--- a/proptools/proptools.go
+++ b/proptools/proptools.go
@@ -146,3 +146,49 @@
}
}
}
+
+func CloneEmptyProperties(structValue reflect.Value) reflect.Value {
+ result := reflect.New(structValue.Type())
+ cloneEmptyProperties(result.Elem(), structValue)
+ return result
+}
+
+func cloneEmptyProperties(dstValue, srcValue reflect.Value) {
+ typ := srcValue.Type()
+ for i := 0; i < srcValue.NumField(); i++ {
+ field := typ.Field(i)
+ if field.PkgPath != "" {
+ // The field is not exported so just skip it.
+ continue
+ }
+
+ srcFieldValue := srcValue.Field(i)
+ dstFieldValue := dstValue.Field(i)
+
+ switch srcFieldValue.Kind() {
+ case reflect.Bool, reflect.String, reflect.Slice, reflect.Int, reflect.Uint:
+ // Nothing
+ case reflect.Struct:
+ cloneEmptyProperties(dstFieldValue, srcFieldValue)
+ case reflect.Ptr, reflect.Interface:
+ if !srcFieldValue.IsNil() {
+ elem := srcFieldValue.Elem()
+ if srcFieldValue.Kind() == reflect.Interface {
+ if elem.Kind() != reflect.Ptr {
+ panic(fmt.Errorf("can't clone field %q: interface "+
+ "refers to a non-pointer", field.Name))
+ }
+ elem = elem.Elem()
+ }
+ if elem.Elem().Kind() != reflect.Struct {
+ panic(fmt.Errorf("can't clone field %q: points to a "+
+ "non-struct", field.Name))
+ }
+ dstFieldValue.Set(CloneEmptyProperties(elem.Elem()))
+ }
+ default:
+ panic(fmt.Errorf("unexpected kind for property struct field %q: %s",
+ field.Name, srcFieldValue.Kind()))
+ }
+ }
+}
