Fully support converting NSDictionary to JS userInfo object

atom/browser/mac/dict_util.mm

@@ -0,0 +1,42 @@
+// Copyright (c) 2016 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/browser/mac/dict_util.h"
+
+#include "base/mac/scoped_nsobject.h"
+#include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
+#include "base/values.h"
+
+namespace atom {
+
+NSDictionary* DictionaryValueToNSDictionary(const base::DictionaryValue& value) {
+  std::string json;
+  if (!base::JSONWriter::Write(value, &json))
+    return nil;
+  NSData* jsonData = [NSData dataWithBytes:json.c_str() length:json.length()];
+  id obj = [NSJSONSerialization JSONObjectWithData:jsonData
+                                           options:0
+                                             error:nil];
+  if (![obj isKindOfClass:[NSDictionary class]])
+    return nil;
+  return obj;
+}
+
+scoped_ptr<base::DictionaryValue> NSDictionaryToDictionaryValue(
+    NSDictionary* dict) {
+  NSData* data = [NSJSONSerialization dataWithJSONObject:dict
+                                                 options:0
+                                                   error:nil];
+  if (!data)
+    return nullptr;
+
+  base::scoped_nsobject<NSString> json =
+      [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
+  scoped_ptr<base::Value> value =
+      base::JSONReader::Read([json UTF8String]);
+  return base::DictionaryValue::From(std::move(value));
+}
+
+}  // namespace atom