src: api to get callback_info from CallBackInfo

- Exposing conversion api to fetch underlying napi_callback_info
  from CallBackInfo
- Add test coverage for CallbackInfo SetData method

PR-URL: #1253
Reviewed-By: Michael Dawson <midawson@redhat.com
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

napi-inl.h

@@ -3451,6 +3451,10 @@ inline CallbackInfo::~CallbackInfo() {
   }
 }
 
+inline CallbackInfo::operator napi_callback_info() const {
+  return _info;
+}
+
 inline Value CallbackInfo::NewTarget() const {
   napi_value newTarget;
   napi_status status = napi_get_new_target(_env, _info, &newTarget);

napi.h

@@ -1791,6 +1791,7 @@ class CallbackInfo {
   Value This() const;
   void* Data() const;
   void SetData(void* data);
+  operator napi_callback_info() const;
 
  private:
   const size_t _staticArgCount = 6;

test/binding.cc

@@ -28,6 +28,7 @@ Object InitCallbackScope(Env env);
 #if (NAPI_VERSION > 4)
 Object InitDate(Env env);
 #endif
+Object InitCallbackInfo(Env env);
 Object InitDataView(Env env);
 Object InitDataViewReadWrite(Env env);
 Object InitEnvCleanup(Env env);
@@ -108,6 +109,7 @@ Object Init(Env env, Object exports) {
 #if (NAPI_VERSION > 2)
   exports.Set("callbackscope", InitCallbackScope(env));
 #endif
+  exports.Set("callbackInfo", InitCallbackInfo(env));
   exports.Set("dataview", InitDataView(env));
   exports.Set("dataview_read_write", InitDataView(env));
   exports.Set("dataview_read_write", InitDataViewReadWrite(env));

test/binding.gyp

@@ -17,6 +17,7 @@
         'basic_types/number.cc',
         'basic_types/value.cc',
         'bigint.cc',
+        'callbackInfo.cc',
         'date.cc',
         'binding.cc',
         'buffer.cc',

test/callbackInfo.cc

@@ -0,0 +1,27 @@
+#include <assert.h>
+#include "napi.h"
+using namespace Napi;
+
+struct TestCBInfoSetData {
+  static void Test(napi_env env, napi_callback_info info) {
+    Napi::CallbackInfo cbInfo(env, info);
+    int valuePointer = 1220202;
+    cbInfo.SetData(&valuePointer);
+
+    int* placeHolder = static_cast<int*>(cbInfo.Data());
+    assert(*(placeHolder) == valuePointer);
+    assert(placeHolder == &valuePointer);
+  }
+};
+
+void TestCallbackInfoSetData(const Napi::CallbackInfo& info) {
+  napi_callback_info cb_info = static_cast<napi_callback_info>(info);
+  TestCBInfoSetData::Test(info.Env(), cb_info);
+}
+
+Object InitCallbackInfo(Env env) {
+  Object exports = Object::New(env);
+
+  exports["testCbSetData"] = Function::New(env, TestCallbackInfoSetData);
+  return exports;
+}

test/callbackInfo.js

@@ -0,0 +1,9 @@
+'use strict';
+
+const common = require('./common');
+
+module.exports = common.runTest(test);
+
+async function test (binding) {
+  binding.callbackInfo.testCbSetData();
+}