mirror of
https://github.com/mikefarah/yq.git
synced 2024-12-19 20:19:04 +00:00
128 lines
3.1 KiB
Go
128 lines
3.1 KiB
Go
package yqlib
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import (
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"encoding/csv"
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"fmt"
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"io"
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)
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type csvEncoder struct {
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separator rune
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}
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func NewCsvEncoder(prefs CsvPreferences) Encoder {
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return &csvEncoder{separator: prefs.Separator}
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}
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func (e *csvEncoder) CanHandleAliases() bool {
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return false
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}
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func (e *csvEncoder) PrintDocumentSeparator(_ io.Writer) error {
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return nil
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}
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func (e *csvEncoder) PrintLeadingContent(_ io.Writer, _ string) error {
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return nil
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}
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func (e *csvEncoder) encodeRow(csvWriter *csv.Writer, contents []*CandidateNode) error {
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stringValues := make([]string, len(contents))
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for i, child := range contents {
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if child.Kind != ScalarNode {
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return fmt.Errorf("csv encoding only works for arrays of scalars (string/numbers/booleans), child[%v] is a %v", i, child.Tag)
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}
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stringValues[i] = child.Value
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}
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return csvWriter.Write(stringValues)
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}
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func (e *csvEncoder) encodeArrays(csvWriter *csv.Writer, content []*CandidateNode) error {
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for i, child := range content {
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if child.Kind != SequenceNode {
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return fmt.Errorf("csv encoding only works for arrays of scalars (string/numbers/booleans), child[%v] is a %v", i, child.Tag)
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}
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err := e.encodeRow(csvWriter, child.Content)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (e *csvEncoder) extractHeader(child *CandidateNode) ([]*CandidateNode, error) {
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if child.Kind != MappingNode {
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return nil, fmt.Errorf("csv object encoding only works for arrays of flat objects (string key => string/numbers/boolean value), child[0] is a %v", child.Tag)
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}
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mapKeys := getMapKeys(child)
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return mapKeys.Content, nil
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}
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func (e *csvEncoder) createChildRow(child *CandidateNode, headers []*CandidateNode) []*CandidateNode {
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childRow := make([]*CandidateNode, 0)
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for _, header := range headers {
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keyIndex := findKeyInMap(child, header)
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value := createScalarNode(nil, "")
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if keyIndex != -1 {
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value = child.Content[keyIndex+1]
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}
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childRow = append(childRow, value)
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}
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return childRow
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}
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func (e *csvEncoder) encodeObjects(csvWriter *csv.Writer, content []*CandidateNode) error {
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headers, err := e.extractHeader(content[0])
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if err != nil {
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return nil
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}
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err = e.encodeRow(csvWriter, headers)
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if err != nil {
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return nil
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}
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for i, child := range content {
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if child.Kind != MappingNode {
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return fmt.Errorf("csv object encoding only works for arrays of flat objects (string key => string/numbers/boolean value), child[%v] is a %v", i, child.Tag)
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}
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row := e.createChildRow(child, headers)
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err = e.encodeRow(csvWriter, row)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (e *csvEncoder) Encode(writer io.Writer, node *CandidateNode) error {
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if node.Kind == ScalarNode {
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return writeString(writer, node.Value+"\n")
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}
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csvWriter := csv.NewWriter(writer)
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csvWriter.Comma = e.separator
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// node must be a sequence
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if node.Kind != SequenceNode {
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return fmt.Errorf("csv encoding only works for arrays, got: %v", node.Tag)
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} else if len(node.Content) == 0 {
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return nil
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}
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if node.Content[0].Kind == ScalarNode {
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return e.encodeRow(csvWriter, node.Content)
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}
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if node.Content[0].Kind == MappingNode {
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return e.encodeObjects(csvWriter, node.Content)
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}
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return e.encodeArrays(csvWriter, node.Content)
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}
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