Add Proxy support for JSON.stringify

JerryScript-DCO-1.0-Signed-off-by: Adam Szilagyi aszilagy@inf.u-szeged.hu

Author: szilagyiadam

jerry-core/ecma/builtin-objects/ecma-builtin-json.c

@@ -1260,13 +1260,33 @@ ecma_builtin_json_serialize_property (ecma_json_stringify_context_t *context_p,
   /* 11. */
   if (ecma_is_value_object (value) && !ecma_op_is_callable (value))
   {
+    ecma_value_t is_array = ecma_is_value_array (value);
+
+#if ENABLED (JERRY_ES2015)
+    if (ECMA_IS_VALUE_ERROR (is_array))
+    {
+      return is_array;
+    }
+#endif /* ENABLED (JERRY_ES2015) */
+
     ecma_object_t *obj_p = ecma_get_object_from_value (value);
 
     ecma_value_t ret_value;
+
     /* 10.a */
-    if (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_ARRAY)
+    if (ecma_is_value_true (is_array))
     {
-      ret_value = ecma_builtin_json_serialize_array (context_p, obj_p);
+      ecma_object_t *array_obj_p = obj_p;
+
+#if ENABLED (JERRY_ES2015)
+      if (ECMA_OBJECT_IS_PROXY (obj_p))
+      {
+        ecma_proxy_object_t *proxy_obj_p = (ecma_proxy_object_t *) obj_p;
+        array_obj_p = ecma_get_object_from_value (proxy_obj_p->target);
+      }
+#endif /* ENABLED (JERRY_ES2015) */
+
+      ret_value = ecma_builtin_json_serialize_array (context_p, array_obj_p);
     }
     /* 10.b */
     else

tests/jerry/json-stringify.js

@@ -212,3 +212,7 @@ assert (JSON.stringify (object, null, undefined) == '{"a":2}');
 assert (JSON.stringify (object, null, new Boolean (true)) == '{"a":2}');
 assert (JSON.stringify (object, null, [1, 2, 3] ) == '{"a":2}');
 assert (JSON.stringify (object, null, { "a": 3 }) == '{"a":2}');
+
+// Test with proxy
+assert(JSON.stringify(new Proxy(['foo'], {})) === '["foo"]');
+assert(JSON.stringify(new Proxy({0:"foo"}, {})) === '{"0":"foo"}');