@NotNull
  public Collection<Language> getSupportedLanguages(@NotNull Project project, @Nullable XSourcePosition sourcePosition) {
    FileType type = getFileType();
    return type instanceof LanguageFileType ? Collections.singleton(((LanguageFileType)type).getLanguage()) : Collections.emptyList();
  }
@NotNull
  public Collection<Language> getSupportedLanguages(@NotNull Project project, @Nullable XSourcePosition sourcePosition)