smarter path splitter for replacements

api/filters/fieldspec/fieldspec.go

@@ -49,7 +49,7 @@ func (fltr Filter) Filter(obj *yaml.RNode) (*yaml.RNode, error) {
 	if match := isMatchGVK(fltr.FieldSpec, obj); !match {
 		return obj, nil
 	}
-	fltr.path = utils.PathSplitter(fltr.FieldSpec.Path)
+	fltr.path = utils.PathSplitter(fltr.FieldSpec.Path, "/")
 	if err := fltr.filter(obj); err != nil {
 		s, _ := obj.String()
 		return nil, errors.WrapPrefixf(err,

api/filters/replacement/replacement.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"strings"
 
+	"sigs.k8s.io/kustomize/api/internal/utils"
 	"sigs.k8s.io/kustomize/api/types"
 	"sigs.k8s.io/kustomize/kyaml/resid"
 	"sigs.k8s.io/kustomize/kyaml/yaml"
@@ -66,7 +67,7 @@ func rejectId(rejects []*types.Selector, id *resid.ResId) bool {
 
 func applyToNode(node *yaml.RNode, value *yaml.RNode, target *types.TargetSelector) error {
 	for _, fp := range target.FieldPaths {
-		fieldPath := strings.Split(fp, ".")
+		fieldPath := utils.SmarterPathSplitter(fp, ".")
 		var t *yaml.RNode
 		var err error
 		if target.Options != nil && target.Options.Create {
@@ -88,13 +89,10 @@ func applyToNode(node *yaml.RNode, value *yaml.RNode, target *types.TargetSelect
 
 func setTargetValue(options *types.FieldOptions, t *yaml.RNode, value *yaml.RNode) error {
 	value = value.Copy()
-
 	if options != nil && options.Delimiter != "" {
-
 		if t.YNode().Kind != yaml.ScalarNode {
 			return fmt.Errorf("delimiter option can only be used with scalar nodes")
 		}
-
 		tv := strings.Split(t.YNode().Value, options.Delimiter)
 		v := yaml.GetValue(value)
 		// TODO: Add a way to remove an element
@@ -121,7 +119,7 @@ func getReplacement(nodes []*yaml.RNode, r *types.Replacement) (*yaml.RNode, err
 	if r.Source.FieldPath == "" {
 		r.Source.FieldPath = types.DefaultReplacementFieldPath
 	}
-	fieldPath := strings.Split(r.Source.FieldPath, ".")
+	fieldPath := utils.SmarterPathSplitter(r.Source.FieldPath, ".")
 
 	rn, err := source.Pipe(yaml.Lookup(fieldPath...))
 	if err != nil {

api/filters/replacement/replacement_test.go

@@ -1381,7 +1381,28 @@ spec:
       delimiter: "-"
       index: 2
 `,
-			expectedErr: "wrong Node Kind for spec.data expected: MappingNode was SequenceNode: value: {- key: some-prefix-replaceme",
+			expected: `apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: source
+data:
+  value: example
+---
+apiVersion: kubernetes-client.io/v1
+kind: ExternalSecret
+metadata:
+  name: some-secret
+spec:
+  backendType: secretsManager
+  data:
+  - key: some-prefix-example
+    name: .first
+    version: latest
+    property: first
+  - key: some-prefix-example
+    name: second
+    version: latest
+    property: second`,
 		},
 		"multiple field paths in target": {
 			input: `apiVersion: v1