Add Field to Set conversion functions (apelisse)

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/apply/fields.go

@@ -0,0 +1,70 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+ Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+     http://www.apache.org/licenses/LICENSE-2.0
+ Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+ package apply
+ import "sigs.k8s.io/structured-merge-diff/fieldpath"
+ type Fields map[string]Fields
+ func fieldsSet(f Fields, path fieldpath.Path, set fieldpath.Set) error {
+	for k := range f {
+		if k == "." {
+			set.Insert(path)
+			continue
+		}
+		pe, err := NewPathElement(k)
+		if err != nil {
+			return err
+		}
+		path = append(path, pe)
+		err = fieldsSet(f[k], path, set)
+		if err != nil {
+			return err
+		}
+		path = path[:len(path)-1]
+	}
+	return nil
+}
+ func FieldsToSet(f Fields) (fieldpath.Set, error) {
+	set := fieldpath.Set{}
+	return set, fieldsSet(f, fieldpath.Path{}, set)
+}
+ func removeUselessDots(f Fields) {
+	if _, ok := f["."]; ok && len(f) == 1 {
+		del(f["."])
+		return
+	}
+	for _, tf := range f {
+		removeUselessDots(tf)
+	}
+}
+ func SetToFields(s fieldpath.Set) (Fields, error) {
+	var err error
+	f := Fields{}
+	s.Iterate(func(path fieldpath.Path) {
+		if err != nil {
+			return
+		}
+		tf := f
+		for _, pe := range path {
+			var str string
+			str, err = PathElementString(pe)
+			if _, ok := tf[str]; ok {
+				tf = tf[str]
+			} else {
+				tf[str] = Fields{}
+				tf = tf[str]
+			}
+		}
+		tf["."] = Fields{}
+	})
+ 	removeUselessDots(f)
+	return f, err
+}

staging/src/k8s.io/apiserver/pkg/endpoints/handlers/fieldmanager/internal/BUILD

@@ -3,6 +3,7 @@ load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 go_library(
     name = "go_default_library",
     srcs = [
+        "fields.go",
         "gvkparser.go",
         "managedfields.go",
         "pathelement.go",