void CefFileDialogManager::RunFileChooserInternal()

in libcef/browser/file_dialog_manager.cc [234:305]
61 lines of code
15 McCabe index (conditional complexity)

void CefFileDialogManager::RunFileChooserInternal(
    const CefFileDialogRunner::FileChooserParams& params,
    CefFileDialogRunner::RunFileChooserCallback callback) {
  CEF_REQUIRE_UIT();

  if (file_chooser_pending_) {
    // Dismiss the new dialog immediately.
    std::move(callback).Run(0, std::vector<base::FilePath>());
    return;
  }

  file_chooser_pending_ = true;

  bool handled = false;

  if (browser_->client().get()) {
    CefRefPtr<CefDialogHandler> handler =
        browser_->client()->GetDialogHandler();
    if (handler.get()) {
      int mode = FILE_DIALOG_OPEN;
      switch (params.mode) {
        case blink::mojom::FileChooserParams::Mode::kOpen:
          mode = FILE_DIALOG_OPEN;
          break;
        case blink::mojom::FileChooserParams::Mode::kOpenMultiple:
          mode = FILE_DIALOG_OPEN_MULTIPLE;
          break;
        case blink::mojom::FileChooserParams::Mode::kUploadFolder:
          mode = FILE_DIALOG_OPEN_FOLDER;
          break;
        case blink::mojom::FileChooserParams::Mode::kSave:
          mode = FILE_DIALOG_SAVE;
          break;
        default:
          NOTREACHED();
          break;
      }

      if (params.overwriteprompt)
        mode |= FILE_DIALOG_OVERWRITEPROMPT_FLAG;
      if (params.hidereadonly)
        mode |= FILE_DIALOG_HIDEREADONLY_FLAG;

      std::vector<std::u16string>::const_iterator it;

      std::vector<CefString> accept_filters;
      it = params.accept_types.begin();
      for (; it != params.accept_types.end(); ++it)
        accept_filters.push_back(*it);

      CefRefPtr<CefFileDialogCallbackImpl> callbackImpl(
          new CefFileDialogCallbackImpl(std::move(callback)));
      handled = handler->OnFileDialog(
          browser_, static_cast<cef_file_dialog_mode_t>(mode), params.title,
          params.default_file_name.value(), accept_filters,
          params.selected_accept_filter, callbackImpl.get());
      if (!handled) {
        // May return nullptr if the client has already executed the callback.
        callback = callbackImpl->Disconnect();
      }
    }
  }

  if (!handled && !callback.is_null()) {
    if (runner_.get()) {
      runner_->Run(browser_, params, std::move(callback));
    } else {
      LOG(WARNING) << "No file dialog runner available for this platform";
      std::move(callback).Run(0, std::vector<base::FilePath>());
    }
  }
}