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|
package storage
import (
"bytes"
"fmt"
"github.com/tomwright/dasel/v2"
"github.com/tomwright/dasel/v2/dencoding"
"io"
)
func init() {
registerReadParser([]string{"json"}, []string{".json"}, &JSONParser{})
registerWriteParser([]string{"json"}, []string{".json"}, &JSONParser{})
}
// JSONParser is a Parser implementation to handle json files.
type JSONParser struct {
}
// FromBytes returns some data that is represented by the given bytes.
func (p *JSONParser) FromBytes(byteData []byte, options ...ReadWriteOption) (dasel.Value, error) {
res := make([]any, 0)
decoder := dencoding.NewJSONDecoder(bytes.NewReader(byteData))
docLoop:
for {
var docData any
if err := decoder.Decode(&docData); err != nil {
if err == io.EOF {
break docLoop
}
return dasel.Value{}, fmt.Errorf("could not unmarshal data: %w", err)
} else {
res = append(res, docData)
}
}
switch len(res) {
case 0:
return dasel.Value{}, nil
case 1:
return dasel.ValueOf(res[0]).
WithMetadata("isSingleDocument", true), nil
default:
return dasel.ValueOf(res).
WithMetadata("isMultiDocument", true), nil
}
}
type toBytesOptions struct {
indent string
prefix string
prettyPrint bool
colourise bool
escapeHTML bool
}
func getToBytesOptions(options ...ReadWriteOption) toBytesOptions {
res := toBytesOptions{
indent: " ",
prefix: "",
prettyPrint: true,
colourise: false,
escapeHTML: false,
}
for _, o := range options {
switch o.Key {
case OptionIndent:
if value, ok := o.Value.(string); ok {
res.indent = value
}
case OptionPrettyPrint:
if value, ok := o.Value.(bool); ok {
res.prettyPrint = value
}
case OptionColourise:
if value, ok := o.Value.(bool); ok {
res.colourise = value
}
case OptionEscapeHTML:
if value, ok := o.Value.(bool); ok {
res.escapeHTML = value
}
}
}
if !res.prettyPrint {
res.indent = ""
}
return res
}
// ToBytes returns a slice of bytes that represents the given value.
func (p *JSONParser) ToBytes(value dasel.Value, options ...ReadWriteOption) ([]byte, error) {
encoderOptions := make([]dencoding.JSONEncoderOption, 0)
baseOptions := getToBytesOptions(options...)
encoderOptions = append(encoderOptions, dencoding.JSONEscapeHTML(baseOptions.escapeHTML))
encoderOptions = append(encoderOptions, dencoding.JSONEncodeIndent(baseOptions.prefix, baseOptions.indent))
buffer := new(bytes.Buffer)
encoder := dencoding.NewJSONEncoder(buffer, encoderOptions...)
defer encoder.Close()
switch {
case value.Metadata("isSingleDocument") == true:
if err := encoder.Encode(value.Interface()); err != nil {
return nil, fmt.Errorf("could not encode single document: %w", err)
}
case value.Metadata("isMultiDocument") == true:
for i := 0; i < value.Len(); i++ {
if err := encoder.Encode(value.Index(i).Interface()); err != nil {
return nil, fmt.Errorf("could not encode multi document [%d]: %w", i, err)
}
}
default:
if err := encoder.Encode(value.Interface()); err != nil {
return nil, fmt.Errorf("could not encode default document type: %w", err)
}
}
if baseOptions.colourise {
if err := ColouriseBuffer(buffer, "json"); err != nil {
return nil, fmt.Errorf("could not colourise output: %w", err)
}
}
return buffer.Bytes(), nil
}
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