yq/pkg/yqlib/encoder_csv.go

package yqlib

import (
	"encoding/csv"
	"fmt"
	"io"

	yaml "gopkg.in/yaml.v3"
)

type csvEncoder struct {
	destination csv.Writer
}

func NewCsvEncoder(destination io.Writer, separator rune) Encoder {
	csvWriter := *csv.NewWriter(destination)
	csvWriter.Comma = separator
	return &csvEncoder{csvWriter}
}

func (e *csvEncoder) Encode(originalNode *yaml.Node) error {
	// node must be a sequence
	node := unwrapDoc(originalNode)
	if node.Kind != yaml.SequenceNode {
		return fmt.Errorf("csv encoding only works for arrays of scalars (string/numbers/booleans), got: %v", node.Tag)
	}

	stringValues := make([]string, len(node.Content))

	for i, child := range node.Content {

		if child.Kind != yaml.ScalarNode {
			return fmt.Errorf("csv encoding only works for arrays of scalars (string/numbers/booleans), child[%v] is a %v", i, child.Tag)
		}
		stringValues[i] = child.Value
	}
	return e.destination.Write(stringValues)
}