| /* |
| 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 internal |
| |
| import ( |
| "encoding/json" |
| "errors" |
| "fmt" |
| "strconv" |
| "strings" |
| |
| "sigs.k8s.io/structured-merge-diff/fieldpath" |
| "sigs.k8s.io/structured-merge-diff/value" |
| ) |
| |
| const ( |
| // Field indicates that the content of this path element is a field's name |
| Field = "f" |
| |
| // Value indicates that the content of this path element is a field's value |
| Value = "v" |
| |
| // Index indicates that the content of this path element is an index in an array |
| Index = "i" |
| |
| // Key indicates that the content of this path element is a key value map |
| Key = "k" |
| |
| // Separator separates the type of a path element from the contents |
| Separator = ":" |
| ) |
| |
| // NewPathElement parses a serialized path element |
| func NewPathElement(s string) (fieldpath.PathElement, error) { |
| split := strings.SplitN(s, Separator, 2) |
| if len(split) < 2 { |
| return fieldpath.PathElement{}, fmt.Errorf("missing colon: %v", s) |
| } |
| switch split[0] { |
| case Field: |
| return fieldpath.PathElement{ |
| FieldName: &split[1], |
| }, nil |
| case Value: |
| val, err := value.FromJSON([]byte(split[1])) |
| if err != nil { |
| return fieldpath.PathElement{}, err |
| } |
| return fieldpath.PathElement{ |
| Value: &val, |
| }, nil |
| case Index: |
| i, err := strconv.Atoi(split[1]) |
| if err != nil { |
| return fieldpath.PathElement{}, err |
| } |
| return fieldpath.PathElement{ |
| Index: &i, |
| }, nil |
| case Key: |
| kv := map[string]json.RawMessage{} |
| err := json.Unmarshal([]byte(split[1]), &kv) |
| if err != nil { |
| return fieldpath.PathElement{}, err |
| } |
| fields := []value.Field{} |
| for k, v := range kv { |
| b, err := json.Marshal(v) |
| if err != nil { |
| return fieldpath.PathElement{}, err |
| } |
| val, err := value.FromJSON(b) |
| if err != nil { |
| return fieldpath.PathElement{}, err |
| } |
| |
| fields = append(fields, value.Field{ |
| Name: k, |
| Value: val, |
| }) |
| } |
| return fieldpath.PathElement{ |
| Key: fields, |
| }, nil |
| default: |
| // Ignore unknown key types |
| return fieldpath.PathElement{}, nil |
| } |
| } |
| |
| // PathElementString serializes a path element |
| func PathElementString(pe fieldpath.PathElement) (string, error) { |
| switch { |
| case pe.FieldName != nil: |
| return Field + Separator + *pe.FieldName, nil |
| case len(pe.Key) > 0: |
| kv := map[string]json.RawMessage{} |
| for _, k := range pe.Key { |
| b, err := k.Value.ToJSON() |
| if err != nil { |
| return "", err |
| } |
| m := json.RawMessage{} |
| err = json.Unmarshal(b, &m) |
| if err != nil { |
| return "", err |
| } |
| kv[k.Name] = m |
| } |
| b, err := json.Marshal(kv) |
| if err != nil { |
| return "", err |
| } |
| return Key + ":" + string(b), nil |
| case pe.Value != nil: |
| b, err := pe.Value.ToJSON() |
| if err != nil { |
| return "", err |
| } |
| return Value + ":" + string(b), nil |
| case pe.Index != nil: |
| return Index + ":" + strconv.Itoa(*pe.Index), nil |
| default: |
| return "", errors.New("Invalid type of path element") |
| } |
| } |