Add RNode implementation of label and annotation selectors.

kyaml/yaml/rnode.go

@@ -12,6 +12,7 @@ import (
 
 	"gopkg.in/yaml.v3"
 	"sigs.k8s.io/kustomize/kyaml/errors"
+	"sigs.k8s.io/kustomize/kyaml/yaml/internal/k8sgen/pkg/labels"
 )
 
 // MakeNullNode returns an RNode that represents an empty document.
@@ -690,6 +691,32 @@ func (rn *RNode) GetValidatedMetadata() (ResourceMeta, error) {
 	return m, nil
 }
 
+// MatchesAnnotationSelector implements ifc.Kunstructured.
+func (rn *RNode) MatchesAnnotationSelector(selector string) (bool, error) {
+	s, err := labels.Parse(selector)
+	if err != nil {
+		return false, err
+	}
+	slice, err := rn.GetAnnotations()
+	if err != nil {
+		return false, err
+	}
+	return s.Matches(labels.Set(slice)), nil
+}
+
+// MatchesLabelSelector implements ifc.Kunstructured.
+func (rn *RNode) MatchesLabelSelector(selector string) (bool, error) {
+	s, err := labels.Parse(selector)
+	if err != nil {
+		return false, err
+	}
+	slice, err := rn.GetLabels()
+	if err != nil {
+		return false, err
+	}
+	return s.Matches(labels.Set(slice)), nil
+}
+
 // HasNilEntryInList returns true if the RNode contains a list which has
 // a nil item, along with the path to the missing item.
 // TODO(broken): This was copied from