Decoder Properties (#1099)

* Decoder Properties

* Added properties round trip test

* Fixed property decode for github actions

* Refactored XML test to use common functions

* Switched formatScenario parameter order for more readablity

pkg/yqlib/decoder_xml.go

@@ -2,7 +2,6 @@ package yqlib
 
 import (
 	"encoding/xml"
-	"fmt"
 	"io"
 	"strings"
 	"unicode"
@@ -11,24 +10,6 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )
 
-type InputFormat uint
-
-const (
-	YamlInputFormat = 1 << iota
-	XMLInputFormat
-)
-
-func InputFormatFromString(format string) (InputFormat, error) {
-	switch format {
-	case "yaml", "y":
-		return YamlInputFormat, nil
-	case "xml", "x":
-		return XMLInputFormat, nil
-	default:
-		return 0, fmt.Errorf("unknown format '%v' please use [yaml|xml]", format)
-	}
-}
-
 type xmlDecoder struct {
 	reader          io.Reader
 	attributePrefix string
@@ -153,6 +134,7 @@ func (dec *xmlDecoder) Decode(rootYamlNode *yaml.Node) error {
 	if err != nil {
 		return err
 	} else if firstNode.Tag == "!!null" {
+		dec.finished = true
 		return io.EOF
 	}
 	rootYamlNode.Kind = yaml.DocumentNode