Added json input functionality

Author: mikefarah

json_converter.go

@@ -4,6 +4,19 @@ import (
 	"encoding/json"
 )
 
+func fromJSONBytes(jsonBytes []byte, parsedData *map[interface{}]interface{}) {
+	*parsedData = make(map[interface{}]interface{})
+	var jsonData map[string]interface{}
+	err := json.Unmarshal(jsonBytes, &jsonData)
+	if err != nil {
+		die("error parsing data: ", err)
+	}
+
+	for key, value := range jsonData {
+		(*parsedData)[key] = fromJSON(value)
+	}
+}
+
 func jsonToString(context interface{}) string {
 	out, err := json.Marshal(toJSON(context))
 	if err != nil {
@@ -12,6 +25,27 @@ func jsonToString(context interface{}) string {
 	return string(out)
 }
 
+func fromJSON(context interface{}) interface{} {
+	switch context.(type) {
+	case []interface{}:
+		oldArray := context.([]interface{})
+		newArray := make([]interface{}, len(oldArray))
+		for index, value := range oldArray {
+			newArray[index] = fromJSON(value)
+		}
+		return newArray
+	case map[string]interface{}:
+		oldMap := context.(map[string]interface{})
+		newMap := make(map[interface{}]interface{})
+		for key, value := range oldMap {
+			newMap[key] = fromJSON(value)
+		}
+		return newMap
+	default:
+		return context
+	}
+}
+
 func toJSON(context interface{}) interface{} {
 	switch context.(type) {
 	case []interface{}:

json_converter_test.go

@@ -1,9 +1,35 @@
 package main
 
 import (
+	"encoding/json"
+	"fmt"
+	"os"
 	"testing"
 )
 
+func TestJsonFromString(t *testing.T) {
+	var data = parseJSONData(`
+  {
+    "b": {
+      "c": 2
+    }
+  }
+`)
+	assertResult(t, "map[b:map[c:2]]", fmt.Sprintf("%v", data))
+}
+
+func TestJsonFromString_withArray(t *testing.T) {
+	var data = parseJSONData(`
+  {
+    "b": [
+      { "c": 5 },
+      { "c": 6 }
+    ]
+  }
+`)
+	assertResult(t, "map[b:[map[c:5] map[c:6]]]", fmt.Sprintf("%v", data))
+}
+
 func TestJsonToString(t *testing.T) {
 	var data = parseData(`
 ---
@@ -22,3 +48,13 @@ b:
 `)
 	assertResult(t, "{\"b\":[{\"item\":\"one\"},{\"item\":\"two\"}]}", jsonToString(data))
 }
+
+func parseJSONData(rawData string) map[string]interface{} {
+	var parsedData map[string]interface{}
+	err := json.Unmarshal([]byte(rawData), &parsedData)
+	if err != nil {
+		fmt.Println("Error parsing json: ", err)
+		os.Exit(1)
+	}
+	return parsedData
+}

sample.json

@@ -0,0 +1 @@
+{"a":"Easy! as one two three","b":{"c":2,"d":[3,4],"e":[{"name":"fred","value":3},{"name":"sam","value":4}]}}

yaml.go

@@ -13,6 +13,7 @@ import (
 var trimOutput = true
 var writeInplace = false
 var writeScript = ""
+var inputJSON = false
 var outputToJSON = false
 
 func main() {
@@ -61,6 +62,8 @@ a.b.e:
 	var rootCmd = &cobra.Command{Use: "yaml"}
 	rootCmd.PersistentFlags().BoolVarP(&trimOutput, "trim", "t", true, "trim yaml output")
 	rootCmd.PersistentFlags().BoolVarP(&outputToJSON, "tojson", "j", false, "output as json")
+	rootCmd.PersistentFlags().BoolVarP(&inputJSON, "fromjson", "J", false, "input as json")
+
 	rootCmd.AddCommand(cmdRead, cmdWrite)
 	rootCmd.Execute()
 }
@@ -72,7 +75,7 @@ func readProperty(cmd *cobra.Command, args []string) {
 func read(args []string) interface{} {
 	var parsedData map[interface{}]interface{}
 
-	readYaml(args[0], &parsedData)
+	readData(args[0], &parsedData, inputJSON)
 
 	if len(args) == 1 {
 		return parsedData
@@ -95,7 +98,7 @@ func writeProperty(cmd *cobra.Command, args []string) {
 func updateYaml(args []string) interface{} {
 	var writeCommands map[string]interface{}
 	if writeScript != "" {
-		readYaml(writeScript, &writeCommands)
+		readData(writeScript, &writeCommands, false)
 	} else if len(args) < 3 {
 		die("Must provide <filename> <path_to_update> <value>")
 	} else {
@@ -104,7 +107,7 @@ func updateYaml(args []string) interface{} {
 	}
 
 	var parsedData map[interface{}]interface{}
-	readYaml(args[0], &parsedData)
+	readData(args[0], &parsedData, inputJSON)
 
 	for path, value := range writeCommands {
 		var paths = parsePath(path)
@@ -154,7 +157,7 @@ func yamlToString(context interface{}) string {
 	return outStr
 }
 
-func readYaml(filename string, parsedData interface{}) {
+func readData(filename string, parsedData interface{}, readAsJSON bool) {
 	if filename == "" {
 		die("Must provide filename")
 	}
@@ -166,9 +169,14 @@ func readYaml(filename string, parsedData interface{}) {
 		rawData = readFile(filename)
 	}
 
-	err := yaml.Unmarshal([]byte(rawData), parsedData)
+	var err interface{}
+	if readAsJSON {
+		fromJSONBytes([]byte(rawData), parsedData.(*map[interface{}]interface{}))
+	} else {
+		err = yaml.Unmarshal([]byte(rawData), parsedData)
+	}
 	if err != nil {
-		die("error: %v", err)
+		die("error parsing data: ", err)
 	}
 }