private Set<String> getSupportedIndentOptions() {
    LanguageCodeStyleSettingsProvider provider = LanguageCodeStyleSettingsProvider.forLanguage(myLanguage);
    if (provider == null) return Collections.emptySet();
    Set<String> indentOptions =
      new HashSet<>(provider.getSupportedFields(LanguageCodeStyleSettingsProvider.SettingsType.INDENT_SETTINGS));
    if (indentOptions.isEmpty()) {
      IndentOptionsEditor editor = provider.getIndentOptionsEditor();
      if (editor != null) {
        indentOptions.add("TAB_SIZE");
        indentOptions.add("USE_TAB_CHARACTER");
        indentOptions.add("INDENT_SIZE");
        if (editor instanceof SmartIndentOptionsEditorBase) {
          indentOptions.add("CONTINUATION_INDENT_SIZE");
          indentOptions.add("SMART_TABS");
          indentOptions.add("KEEP_INDENTS_ON_EMPTY_LINES");
        }
      }
    }
    return indentOptions;
  }
private Set<String> getSupportedIndentOptions()