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package dencoding
import (
"bytes"
"github.com/pelletier/go-toml/v2"
"io"
)
// TOMLEncoder wraps a standard toml encoder to implement custom ordering logic.
type TOMLEncoder struct {
encoder *toml.Encoder
writer io.Writer
buffer *bytes.Buffer
}
// NewTOMLEncoder returns a new dencoding TOMLEncoder.
func NewTOMLEncoder(w io.Writer, options ...TOMLEncoderOption) *TOMLEncoder {
buffer := new(bytes.Buffer)
tomlEncoder := toml.NewEncoder(buffer)
tomlEncoder.SetIndentTables(false)
encoder := &TOMLEncoder{
writer: w,
encoder: tomlEncoder,
buffer: buffer,
}
for _, o := range options {
o.ApplyEncoder(encoder)
}
return encoder
}
// Encode encodes the given value and writes the encodes bytes to the stream.
func (encoder *TOMLEncoder) Encode(v any) error {
// No ordering is done here.
adjusted := removeDencodingMap(v)
if err := encoder.encoder.Encode(adjusted); err != nil {
return err
}
data, err := io.ReadAll(encoder.buffer)
if err != nil {
return err
}
if _, err := encoder.writer.Write(data); err != nil {
return err
}
newline := []byte("\n")
if !bytes.HasSuffix(data, newline) {
if _, err := encoder.writer.Write(newline); err != nil {
return err
}
}
return nil
}
// Close cleans up the encoder.
func (encoder *TOMLEncoder) Close() error {
return nil
}
func removeDencodingMap(value any) any {
switch v := value.(type) {
case []any:
return removeDencodingMapFromArray(v)
case map[string]any:
return removeDencodingMapFromMap(v)
case *Map:
return removeDencodingMap(v.data)
default:
return v
}
}
func removeDencodingMapFromArray(value []any) []any {
for k, v := range value {
value[k] = removeDencodingMap(v)
}
return value
}
func removeDencodingMapFromMap(value map[string]any) map[string]any {
for k, v := range value {
value[k] = removeDencodingMap(v)
}
return value
}
// TOMLIndentSymbol sets the indentation when encoding TOML.
func TOMLIndentSymbol(symbol string) TOMLEncoderOption {
return tomlEncodeSymbol{symbol: symbol}
}
type tomlEncodeSymbol struct {
symbol string
}
func (option tomlEncodeSymbol) ApplyEncoder(encoder *TOMLEncoder) {
encoder.encoder.SetIndentSymbol(option.symbol)
encoder.encoder.SetIndentTables(option.symbol != "")
}
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