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decode.go
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decode.go
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package main
import (
"encoding/json"
"encoding/xml"
"errors"
"io"
"strings"
"sigs.k8s.io/yaml"
)
// decoder is an interface implemented by *json.Decoder
// and by yamlDecoder. It allows the rendering logic to
// work with both decoders interchangeably.
type decoder interface {
Decode(v any) error
}
// yamlDecoder implements the decoder interface.
type yamlDecoder struct {
r io.Reader
}
// Decode decodes data coming from an io.Reader into v.
func (d *yamlDecoder) Decode(v any) error {
b, err := io.ReadAll(d.r)
if err != nil {
return err
}
return yaml.Unmarshal(b, v)
}
type plainDecoder struct {
r io.Reader
}
func (d *plainDecoder) Decode(v any) error {
b, err := io.ReadAll(d.r)
if err != nil {
return err
}
if x, ok := v.(*map[string]interface{}); ok {
z := *x
z["value"] = strings.TrimSpace(string(b))
} else {
return errors.New("unexpected type")
}
return nil
}
// newDecoderFunc creates a decoder for given io.Reader r.
type newDecoderFunc func(r io.Reader) decoder
// selectNewDecoderFunc chooses the decoder to use for each file extension.
func selectNewDecoderFunc(ext string) newDecoderFunc {
switch ext {
case ".json":
return func(r io.Reader) decoder { return json.NewDecoder(r) }
case ".yaml", ".yml":
return func(r io.Reader) decoder { return &yamlDecoder{r} }
case ".xml":
return func(r io.Reader) decoder { return xml.NewDecoder(r) }
}
return func(r io.Reader) decoder { return &plainDecoder{r} }
}