mirror of https://github.com/pulumi/pulumi.git
131 lines
3.2 KiB
Go
131 lines
3.2 KiB
Go
// Copyright 2016-2022, Pulumi Corporation.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package yamlutil
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import (
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"errors"
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"gopkg.in/yaml.v3"
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)
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type HasRawValue interface {
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RawValue() []byte
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}
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// Edit does a deep comparison on original and new and returns a YAML document that modifies only
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// the nodes changed between original and new.
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func Edit(original []byte, new interface{}) ([]byte, error) {
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var err error
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var oldDoc yaml.Node
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err = yaml.Unmarshal(original, &oldDoc)
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if err != nil {
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return nil, err
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}
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newBytes, err := yaml.Marshal(new)
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if err != nil {
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return nil, err
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}
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var newValue yaml.Node
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err = yaml.Unmarshal(newBytes, &newValue)
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if err != nil {
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return nil, err
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}
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newValue, err = editNodes(&oldDoc, &newValue)
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if err != nil {
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return nil, err
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}
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return YamlEncode(&newValue)
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}
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func editNodes(original, new *yaml.Node) (yaml.Node, error) {
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if original.Kind != new.Kind {
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return *new, nil
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}
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ret := *original
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ret.Tag = new.Tag
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ret.Value = new.Value
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switch original.Kind {
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case yaml.DocumentNode, yaml.SequenceNode:
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var minLen int
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var content []*yaml.Node
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if len(new.Content) < len(original.Content) {
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minLen = len(new.Content)
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} else {
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minLen = len(original.Content)
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}
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for i := 0; i < minLen; i++ {
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item, err := editNodes(original.Content[i], new.Content[i])
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if err != nil {
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return ret, err
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}
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content = append(content, &item)
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}
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// Any excess nodes in the new value are copied verbatim
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content = append(content, new.Content[minLen:]...)
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ret.Content = content
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return ret, nil
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case yaml.MappingNode:
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origKeys := make(map[string]int)
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newKeys := make(map[string]int)
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var newKeyList []string
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var content []*yaml.Node
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for i := 0; i < len(original.Content); i += 2 {
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origKeys[original.Content[i].Value] = i
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}
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for i := 0; i < len(new.Content); i += 2 {
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value := new.Content[i].Value
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newKeys[value] = i
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newKeyList = append(newKeyList, value)
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}
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for _, k := range newKeyList {
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newIdx := newKeys[k]
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origIdx, has := origKeys[k]
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var err error
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var key yaml.Node
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var value yaml.Node
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if has {
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key, err = editNodes(original.Content[origIdx], new.Content[newIdx])
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if err != nil {
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return ret, err
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}
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value, err = editNodes(original.Content[origIdx+1], new.Content[newIdx+1])
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if err != nil {
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return ret, err
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}
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} else {
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key = *new.Content[newIdx]
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value = *new.Content[newIdx+1]
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}
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content = append(content, &key)
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content = append(content, &value)
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}
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ret.Content = content
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return ret, nil
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case yaml.ScalarNode, yaml.AliasNode:
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ret.Content = new.Content
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return ret, nil
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}
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return yaml.Node{}, errors.New("unknown node type")
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}
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