github.com/minio/controller-tools@v0.4.7/pkg/schemapatcher/internal/yaml/set.go (about) 1 /* 2 Copyright 2019 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package yaml 18 19 import ( 20 "fmt" 21 22 "gopkg.in/yaml.v3" 23 ) 24 25 // SetNode sets the given path to the given yaml Node, creating mapping nodes along the way. 26 func SetNode(root *yaml.Node, val yaml.Node, path ...string) error { 27 currNode, path, err := asCloseAsPossible(root, path...) 28 if err != nil { 29 return err 30 } 31 32 if len(path) > 0 { 33 if currNode.Kind != yaml.MappingNode { 34 return fmt.Errorf("unexpected non-mapping before path %v", path) 35 } 36 37 for ; len(path) > 0; path = path[1:] { 38 keyNode := yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Style: yaml.DoubleQuotedStyle, Value: path[0]} 39 nextNode := &yaml.Node{Kind: yaml.MappingNode} 40 currNode.Content = append(currNode.Content, &keyNode, nextNode) 41 42 currNode = nextNode 43 } 44 } 45 46 *currNode = val 47 return nil 48 } 49 50 // DeleteNode deletes the node at the given path in the given tree of mapping nodes. 51 // It's a noop if the path doesn't exist. 52 func DeleteNode(root *yaml.Node, path ...string) error { 53 if len(path) == 0 { 54 return fmt.Errorf("must specify a path to delete") 55 } 56 pathToParent, keyToDelete := path[:len(path)-1], path[len(path)-1] 57 parentNode, path, err := asCloseAsPossible(root, pathToParent...) 58 if err != nil { 59 return err 60 } 61 if len(path) > 0 { 62 // no-op, parent node doesn't exist 63 return nil 64 } 65 66 if parentNode.Kind != yaml.MappingNode { 67 return fmt.Errorf("unexpected non-mapping node") 68 } 69 70 for i := 0; i < len(parentNode.Content)/2; i++ { 71 keyNode := parentNode.Content[i*2] 72 if keyNode.Value == keyToDelete { 73 parentNode.Content = append(parentNode.Content[:i*2], parentNode.Content[i*2+2:]...) 74 return nil 75 } 76 } 77 78 // no-op, key not found in parent node 79 return nil 80 }