yq/pkg/yqlib/operator_encoder_decoder.go
2022-07-27 12:26:22 +10:00

141 lines
4.1 KiB
Go

package yqlib
import (
"bufio"
"bytes"
"container/list"
"regexp"
"strings"
"gopkg.in/yaml.v3"
)
func configureEncoder(format PrinterOutputFormat, indent int) Encoder {
switch format {
case JSONOutputFormat:
return NewJSONEncoder(indent, false)
case PropsOutputFormat:
return NewPropertiesEncoder(true)
case CSVOutputFormat:
return NewCsvEncoder(',')
case TSVOutputFormat:
return NewCsvEncoder('\t')
case YamlOutputFormat:
return NewYamlEncoder(indent, false, true, true)
case XMLOutputFormat:
return NewXMLEncoder(indent, XMLPreferences.AttributePrefix, XMLPreferences.ContentName)
case Base64OutputFormat:
return NewBase64Encoder()
}
panic("invalid encoder")
}
func encodeToString(candidate *CandidateNode, prefs encoderPreferences) (string, error) {
var output bytes.Buffer
log.Debug("printing with indent: %v", prefs.indent)
encoder := configureEncoder(prefs.format, prefs.indent)
printer := NewPrinter(encoder, NewSinglePrinterWriter(bufio.NewWriter(&output)))
err := printer.PrintResults(candidate.AsList())
return output.String(), err
}
type encoderPreferences struct {
format PrinterOutputFormat
indent int
}
/* encodes object as yaml string */
func encodeOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
preferences := expressionNode.Operation.Preferences.(encoderPreferences)
var results = list.New()
hasOnlyOneNewLine := regexp.MustCompile("[^\n].*\n$")
endWithNewLine := regexp.MustCompile(".*\n$")
chomper := regexp.MustCompile("\n+$")
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
stringValue, err := encodeToString(candidate, preferences)
if err != nil {
return Context{}, err
}
// remove trailing newlines if needed.
// check if we originally decoded this path, and the original thing had a single line.
originalList := context.GetVariable("decoded: " + candidate.GetKey())
if originalList != nil && originalList.Len() > 0 && hasOnlyOneNewLine.MatchString(stringValue) {
original := originalList.Front().Value.(*CandidateNode)
originalNode := unwrapDoc(original.Node)
// original block did not have a new line at the end, get rid of this one too
if !endWithNewLine.MatchString(originalNode.Value) {
stringValue = chomper.ReplaceAllString(stringValue, "")
}
}
// dont print a new line when printing json on a single line.
if (preferences.format == JSONOutputFormat && preferences.indent == 0) ||
preferences.format == CSVOutputFormat ||
preferences.format == TSVOutputFormat {
stringValue = chomper.ReplaceAllString(stringValue, "")
}
stringContentNode := &yaml.Node{Kind: yaml.ScalarNode, Tag: "!!str", Value: stringValue}
results.PushBack(candidate.CreateReplacement(stringContentNode))
}
return context.ChildContext(results), nil
}
type decoderPreferences struct {
format InputFormat
}
/* takes a string and decodes it back into an object */
func decodeOperator(d *dataTreeNavigator, context Context, expressionNode *ExpressionNode) (Context, error) {
preferences := expressionNode.Operation.Preferences.(decoderPreferences)
var decoder Decoder
switch preferences.format {
case YamlInputFormat:
decoder = NewYamlDecoder()
case XMLInputFormat:
decoder = NewXMLDecoder(
XMLPreferences.AttributePrefix,
XMLPreferences.ContentName,
XMLPreferences.StrictMode,
XMLPreferences.KeepNamespace,
XMLPreferences.UseRawToken)
case Base64InputFormat:
decoder = NewBase64Decoder()
case PropertiesInputFormat:
decoder = NewPropertiesDecoder()
}
var results = list.New()
for el := context.MatchingNodes.Front(); el != nil; el = el.Next() {
candidate := el.Value.(*CandidateNode)
context.SetVariable("decoded: "+candidate.GetKey(), candidate.AsList())
var dataBucket yaml.Node
log.Debugf("got: [%v]", candidate.Node.Value)
decoder.Init(strings.NewReader(unwrapDoc(candidate.Node).Value))
errorReading := decoder.Decode(&dataBucket)
if errorReading != nil {
return Context{}, errorReading
}
//first node is a doc
node := unwrapDoc(&dataBucket)
results.PushBack(candidate.CreateReplacement(node))
}
return context.ChildContext(results), nil
}