move transformerconfig package to transformers/config

pkg/transformers/config/referencepathconfig.go

@@ -0,0 +1,64 @@
+/*
+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 (
+	"sigs.k8s.io/kustomize/pkg/gvk"
+)
+
+// ReferencePathConfig contains the configuration of a field that references
+// the name of another resource whose GroupVersionKind is specified in referencedGVK.
+// e.g. pod.spec.template.volumes.configMap.name references the name of a configmap
+// Its corresponding referencePathConfig will look like:
+//
+//	ReferencePathConfig{
+//	referencedGVK: schema.GroupVersionKind{Version: "v1", Kind: "ConfigMap"},
+//	pathConfigs: []PathConfig{
+//		{
+//			GroupVersionKind: &schema.GroupVersionKind{Version: "v1", Kind: "Pod"},
+//			Path:             []string{"spec", "volumes", "configMap", "name"},
+//		},
+//	}
+type ReferencePathConfig struct {
+	gvk.Gvk `json:",inline,omitempty" yaml:",inline,omitempty"`
+	// PathConfig is the gvk that is referencing the referencedGVK object's name.
+	PathConfigs []PathConfig `json:"pathConfigs,omitempty" yaml:"pathConfigs,omitempty"`
+}
+
+func merge(configs []ReferencePathConfig, config ReferencePathConfig) []ReferencePathConfig {
+	var result []ReferencePathConfig
+	found := false
+	for _, c := range configs {
+		if c.Equals(config.Gvk) {
+			c.PathConfigs = append(c.PathConfigs, config.PathConfigs...)
+			found = true
+		}
+		result = append(result, c)
+	}
+
+	if !found {
+		result = append(result, config)
+	}
+	return result
+}
+
+func mergeNameReferencePathConfigs(a, b []ReferencePathConfig) []ReferencePathConfig {
+	for _, r := range b {
+		a = merge(a, r)
+	}
+	return a
+}