void HandleAccessibilityRequestCallback()

in shell/browser/ui/webui/accessibility_ui.cc [213:305]
65 lines of code
20 McCabe index (conditional complexity)

void HandleAccessibilityRequestCallback(
    content::BrowserContext* current_context,
    const std::string& path,
    content::WebUIDataSource::GotDataCallback callback) {
  DCHECK(ShouldHandleAccessibilityRequestCallback(path));

  base::DictionaryValue data;
  ui::AXMode mode =
      content::BrowserAccessibilityState::GetInstance()->GetAccessibilityMode();
  bool is_native_enabled = content::BrowserAccessibilityState::GetInstance()
                               ->IsRendererAccessibilityEnabled();
  bool native = mode.has_mode(ui::AXMode::kNativeAPIs);
  bool web = mode.has_mode(ui::AXMode::kWebContents);
  bool text = mode.has_mode(ui::AXMode::kInlineTextBoxes);
  bool screenreader = mode.has_mode(ui::AXMode::kScreenReader);
  bool html = mode.has_mode(ui::AXMode::kHTML);
  bool pdf = mode.has_mode(ui::AXMode::kPDF);

  // The "native" and "web" flags are disabled if
  // --disable-renderer-accessibility is set.
  data.SetString(kNative,
                 is_native_enabled ? (native ? kOn : kOff) : kDisabled);
  data.SetString(kWeb, is_native_enabled ? (web ? kOn : kOff) : kDisabled);

  // The "text", "screenreader" and "html" flags are only
  // meaningful if "web" is enabled.
  bool is_web_enabled = is_native_enabled && web;
  data.SetString(kText, is_web_enabled ? (text ? kOn : kOff) : kDisabled);
  data.SetString(kScreenReader,
                 is_web_enabled ? (screenreader ? kOn : kOff) : kDisabled);
  data.SetString(kHTML, is_web_enabled ? (html ? kOn : kOff) : kDisabled);

  // TODO(codebytere): enable use of this flag.
  //
  // The "labelImages" flag works only if "web" is enabled, the current profile
  // has the kAccessibilityImageLabelsEnabled preference set and the appropriate
  // command line switch has been used. Since this is so closely tied into user
  // prefs and causes bugs, we're disabling it for now.
  bool are_accessibility_image_labels_enabled = is_web_enabled;
  data.SetString(kLabelImages, kDisabled);

  // The "pdf" flag is independent of the others.
  data.SetString(kPDF, pdf ? kOn : kOff);

  // Always dump the Accessibility tree.
  data.SetString(kInternal, kOn);

  auto rvh_list = std::make_unique<base::ListValue>();
  std::unique_ptr<content::RenderWidgetHostIterator> widgets(
      content::RenderWidgetHost::GetRenderWidgetHosts());

  while (content::RenderWidgetHost* widget = widgets->GetNextHost()) {
    // Ignore processes that don't have a connection, such as crashed tabs.
    if (!widget->GetProcess()->IsInitializedAndNotDead())
      continue;
    content::RenderViewHost* rvh = content::RenderViewHost::From(widget);
    if (!rvh)
      continue;
    content::WebContents* web_contents =
        content::WebContents::FromRenderViewHost(rvh);
    content::WebContentsDelegate* delegate = web_contents->GetDelegate();
    if (!delegate)
      continue;
    // Ignore views that are never user-visible, like background pages.
    if (delegate->IsNeverComposited(web_contents))
      continue;
    content::BrowserContext* context = rvh->GetProcess()->GetBrowserContext();
    if (context != current_context)
      continue;

    std::unique_ptr<base::DictionaryValue> descriptor =
        BuildTargetDescriptor(rvh);
    descriptor->SetBoolean(kNative, is_native_enabled);
    descriptor->SetBoolean(kWeb, is_web_enabled);
    descriptor->SetBoolean(kLabelImages,
                           are_accessibility_image_labels_enabled);
    rvh_list->Append(std::move(descriptor));
  }

  data.Set(kPagesField, std::move(rvh_list));

  auto window_list = std::make_unique<base::ListValue>();
  for (auto* window : electron::WindowList::GetWindows()) {
    window_list->Append(BuildTargetDescriptor(window));
  }

  data.Set(kBrowsersField, std::move(window_list));

  std::string json_string;
  base::JSONWriter::Write(data, &json_string);

  std::move(callback).Run(base::RefCountedString::TakeString(&json_string));
}