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yamlprocessor.go
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yamlprocessor.go
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// Copyright 2022 The PipeCD 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 yamlprocessor
import (
"errors"
"fmt"
goyaml "github.com/goccy/go-yaml"
"github.com/goccy/go-yaml/ast"
"github.com/goccy/go-yaml/parser"
)
type Processor struct {
file *ast.File
}
func NewProcessor(data []byte) (*Processor, error) {
f, err := parser.ParseBytes(data, parser.ParseComments)
if err != nil {
return nil, err
}
return &Processor{
file: f,
}, nil
}
// GetValue gives back the value placed at a given path. The type of
// returned value can be string, int64, uint64, float64 and bool.
//
// The path requires to start with "$" which represents the root element.
// Available operators are:
// $ : the root object/element
// . : child operator
// .. : recursive descent
// [num] : object/element of array by number
//
// e.g. "$.foo.bar[0].baz"
func (p *Processor) GetValue(path string) (interface{}, error) {
if path == "" {
return nil, fmt.Errorf("no path given")
}
yamlPath, err := goyaml.PathString(path)
if err != nil {
return nil, fmt.Errorf("failed to parse path %s: %w", path, err)
}
node, err := yamlPath.FilterFile(p.file)
if err != nil {
return nil, err
}
var value interface{}
if err := goyaml.Unmarshal([]byte(node.String()), &value); err != nil {
return nil, err
}
return value, nil
}
// ReplaceString replaces the value placed at a given path with
// a given string value.
func (p *Processor) ReplaceString(path, value string) error {
if path == "" {
return errors.New("no path given")
}
yamlPath, err := goyaml.PathString(path)
if err != nil {
return fmt.Errorf("failed to parse path %s: %w", path, err)
}
// Retrieve the current node placed at the specified path.
oldNode, err := yamlPath.FilterFile(p.file)
if err != nil {
return err
}
newNode := &ast.StringNode{
BaseNode: &ast.BaseNode{},
Token: oldNode.GetToken(),
Value: value,
}
if c := oldNode.GetComment(); c != nil {
newNode.SetComment(c)
}
return yamlPath.ReplaceWithNode(p.file, newNode)
}
func (p *Processor) Bytes() []byte {
return []byte(p.file.String())
}