move transformerconfig package to transformers/config

pkg/transformers/config/pathconfig.go

@@ -0,0 +1,60 @@
+/*
+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 config
+
+import (
+	"strings"
+
+	"sigs.k8s.io/kustomize/pkg/gvk"
+)
+
+// PathConfig contains the configuration of a field, including the gvk it ties to,
+// path to the field, etc.
+type PathConfig struct {
+	gvk.Gvk            `json:",inline,omitempty" yaml:",inline,omitempty"`
+	Path               string `json:"path,omitempty" yaml:"path,omitempty"`
+	CreateIfNotPresent bool   `json:"create,omitempty" yaml:"create,omitempty"`
+}
+
+const (
+	escapedForwardSlash  = "\\/"
+	tempSlashReplacement = "???"
+)
+
+// PathSlice converts the path string to a slice of strings, separated by "/"
+// "/" can be contained in a fieldname.
+// such as ingress.kubernetes.io/auth-secret in Ingress annotations.
+// To deal with this special case, the path to this field should be formatted as
+//
+// metadata/annotations/ingress.kubernetes.io\/auth-secret
+//
+// Then PathSlice will return
+//
+// []string{"metadata", "annotations", "ingress.auth-secretkubernetes.io/auth-secret"}
+func (p PathConfig) PathSlice() []string {
+	if !strings.Contains(p.Path, escapedForwardSlash) {
+		return strings.Split(p.Path, "/")
+	}
+
+	s := strings.Replace(p.Path, escapedForwardSlash, tempSlashReplacement, -1)
+	paths := strings.Split(s, "/")
+	var result []string
+	for _, path := range paths {
+		result = append(result, strings.Replace(path, tempSlashReplacement, "/", -1))
+	}
+	return result
+}