/
yaml.go
119 lines (102 loc) · 2.75 KB
/
yaml.go
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package storage
import (
"bytes"
"fmt"
"gopkg.in/yaml.v2"
"io"
)
func init() {
registerReadParser([]string{"yaml", "yml"}, []string{".yaml", ".yml"}, &YAMLParser{})
registerWriteParser([]string{"yaml", "yml"}, []string{".yaml", ".yml"}, &YAMLParser{})
}
// YAMLParser is a Parser implementation to handle yaml files.
type YAMLParser struct {
}
// FromBytes returns some data that is represented by the given bytes.
func (p *YAMLParser) FromBytes(byteData []byte) (interface{}, error) {
res := make([]interface{}, 0)
decoder := yaml.NewDecoder(bytes.NewBuffer(byteData))
docLoop:
for {
var docData interface{}
if err := decoder.Decode(&docData); err != nil {
if err == io.EOF {
break docLoop
}
return nil, fmt.Errorf("could not unmarshal data: %w", err)
}
formattedDocData := cleanupYamlMapValue(docData)
res = append(res, formattedDocData)
}
switch len(res) {
case 0:
return nil, nil
case 1:
return &BasicSingleDocument{Value: res[0]}, nil
default:
return &BasicMultiDocument{Values: res}, nil
}
}
func cleanupYamlInterfaceArray(in []interface{}) []interface{} {
res := make([]interface{}, len(in))
for i, v := range in {
res[i] = cleanupYamlMapValue(v)
}
return res
}
func cleanupYamlInterfaceMap(in map[interface{}]interface{}) map[string]interface{} {
res := make(map[string]interface{})
for k, v := range in {
res[fmt.Sprint(k)] = cleanupYamlMapValue(v)
}
return res
}
func cleanupYamlMapValue(v interface{}) interface{} {
switch v := v.(type) {
case []interface{}:
return cleanupYamlInterfaceArray(v)
case map[interface{}]interface{}:
return cleanupYamlInterfaceMap(v)
case string:
return v
default:
return v
}
}
// ToBytes returns a slice of bytes that represents the given value.
func (p *YAMLParser) ToBytes(value interface{}, options ...ReadWriteOption) ([]byte, error) {
buffer := new(bytes.Buffer)
encoder := yaml.NewEncoder(buffer)
defer encoder.Close()
colourise := false
for _, o := range options {
switch o.Key {
case OptionColourise:
if value, ok := o.Value.(bool); ok {
colourise = value
}
}
}
switch v := value.(type) {
case SingleDocument:
if err := encoder.Encode(v.Document()); err != nil {
return nil, fmt.Errorf("could not encode single document: %w", err)
}
case MultiDocument:
for index, d := range v.Documents() {
if err := encoder.Encode(d); err != nil {
return nil, fmt.Errorf("could not encode multi document [%d]: %w", index, err)
}
}
default:
if err := encoder.Encode(v); err != nil {
return nil, fmt.Errorf("could not encode default document type: %w", err)
}
}
if colourise {
if err := ColouriseBuffer(buffer, "yaml"); err != nil {
return nil, fmt.Errorf("could not colourise output: %w", err)
}
}
return buffer.Bytes(), nil
}