make typeof(null) be null, not null

update python, js, and golang codes

update specification.yml

Author: alexandrasp

README.md

@@ -727,7 +727,7 @@ result:
  - array
  - object
  - function
- - null  # note: the value null, not the string "null"
+ - null 
  - ''    # .. which interpolates to an empty string
 ```
 

jsone.go

@@ -189,7 +189,7 @@ var builtin = map[string]interface{}{
 		case bool:
 			return "boolean"
 		case nil:
-			return nil
+			return "null"
 		case []interface{}:
 			return "array"
 		case map[string]interface{}:

jsone/builtins.py

@@ -114,7 +114,7 @@ def typeof(v):
         elif isinstance(v, dict):
             return 'object'
         elif v is None:
-            return None
+            return 'null'
         elif callable(v):
             return 'function'
 

jsone/newsfragments/246.bugfix

@@ -0,0 +1 @@
+make typeof(null) be "null", not null

jsone/render.py

@@ -43,7 +43,7 @@ def interpolate(string, context):
             if isinstance(parsed, (list, dict)):
                 raise TemplateError(
                     "interpolation of '{}' produced an array or object".format(string[:offset]))
-            if to_str(parsed) == "null":
+            if parsed is None:
                 result.append("")
             else:
                 result.append(to_str(parsed))
@@ -56,7 +56,6 @@ def interpolate(string, context):
         if not mo:
             result.append(string)
             break
-
     return ''.join(result)
 
 

specification.yml

@@ -1860,16 +1860,16 @@ result: object
 title:    typeof null
 context:  {x: null}
 template: {$eval: 'typeof(x)'}
-result: null
+result: 'null'
 ---
 title:    typeof null, interpolated
 context:  {x: null}
 template: "${typeof(x)}"
-result: ''
+result: 'null'
 ---
 title:    typeof null in if
 context:  {}
-template: {$if: 'typeof(null) == null', then: 'foo', else: 'bar'}
+template: {$if: 'typeof(null) == "null"', then: 'foo', else: 'bar'}
 result: foo
 ---
 title:    typeof function
@@ -3726,9 +3726,9 @@ template: {$eval: 'key'}
 result: {a: 1}
 ---
 title: 'property with null value'
-context: {key: null}
+context: {key: 'null'}
 template: {$eval: 'key'}
-result: null
+result: 'null'
 ---
 title: 'missing property'
 context: {key: {a: 1}}

src/builtins.js

@@ -132,7 +132,7 @@ module.exports = (context) => {
         }
       }
       if (types['null'](x)) {
-        return null;
+        return 'null';
       }
       throw builtinError('builtin: typeof', `argument ${x} to be a valid json-e type. found ${typeof arg}`);
     },