Set tags on maps,arrays when decoding json #1422

Author: mikefarah

pkg/yqlib/decoder_json.go

@@ -60,7 +60,7 @@ func (dec *jsonDecoder) convertToYamlNode(data *orderedMap) (*yaml.Node, error)
 		}
 	}
 
-	var yamlMap = &yaml.Node{Kind: yaml.MappingNode}
+	var yamlMap = &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map"}
 	for _, keyValuePair := range data.kv {
 		yamlValue, err := dec.convertToYamlNode(&keyValuePair.V)
 		if err != nil {
@@ -74,7 +74,7 @@ func (dec *jsonDecoder) convertToYamlNode(data *orderedMap) (*yaml.Node, error)
 
 func (dec *jsonDecoder) parseArray(dataArray []*orderedMap) (*yaml.Node, error) {
 
-	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode}
+	var yamlMap = &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
 
 	for _, value := range dataArray {
 		yamlValue, err := dec.convertToYamlNode(value)

pkg/yqlib/json_test.go

@@ -78,6 +78,14 @@ const roundTripMultiLineJson = `{
 `
 
 var jsonScenarios = []formatScenario{
+	{
+		description:  "set tags",
+		skipDoc:      true,
+		input:        "[{}]",
+		expression:   `[.. | type]`,
+		scenarioType: "roundtrip-ndjson",
+		expected:     "[\"!!seq\",\"!!map\"]\n",
+	},
 	{
 		description:    "Parse json: simple",
 		subdescription: "JSON is a subset of yaml, so all you need to do is prettify the output",