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formatter.go
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formatter.go
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// Copyright 2022 Google LLC
//
// 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 basic
import (
"bytes"
"errors"
"io"
"github.com/google/yamlfmt"
"github.com/google/yamlfmt/internal/hotfix"
"gopkg.in/yaml.v3"
)
const BasicFormatterType string = "basic"
type BasicFormatter struct {
Config *Config
}
func (f *BasicFormatter) Type() string {
return BasicFormatterType
}
func (f *BasicFormatter) Format(yamlContent []byte) ([]byte, error) {
var reader *bytes.Reader
if f.Config.LineEnding == yamlfmt.LineBreakStyleCRLF {
crStrippedContent := hotfix.StripCRBytes(yamlContent)
reader = bytes.NewReader(crStrippedContent)
} else {
reader = bytes.NewReader(yamlContent)
}
encodedContent, err := retainLineBreaks(reader, f.format)
if err != nil {
return nil, err
}
if f.Config.IncludeDocumentStart {
encodedContent = withDocumentStart(encodedContent)
}
if f.Config.EmojiSupport {
encodedContent = hotfix.ParseUnicodePoints(encodedContent)
}
if f.Config.LineEnding == yamlfmt.LineBreakStyleCRLF {
encodedContent = hotfix.WriteCRLFBytes(encodedContent)
}
return encodedContent, nil
}
func (f *BasicFormatter) format(in io.Reader) (io.Reader, error) {
decoder := yaml.NewDecoder(in)
documents := []yaml.Node{}
for {
var docNode yaml.Node
err := decoder.Decode(&docNode)
if err != nil {
if errors.Is(err, io.EOF) {
break
}
return nil, err
}
documents = append(documents, docNode)
}
var b bytes.Buffer
e := yaml.NewEncoder(&b)
e.SetIndent(f.Config.Indent)
for _, doc := range documents {
err := e.Encode(&doc)
if err != nil {
return nil, err
}
}
return &b, nil
}
func withDocumentStart(document []byte) []byte {
documentStart := "---\n"
return append([]byte(documentStart), document...)
}