public static @Nullable SnippetMarkup fromSnippet(@NotNull PsiSnippetDocTagValue snippet) {
    SnippetMarkup markup = fromExternalSnippet(snippet);
    if (markup != null) {
      return markup;
    }
    PsiSnippetDocTagBody body = snippet.getBody();
    return body != null ? fromElement(body) : null;
  }
public static @Nullable SnippetMarkup fromSnippet(@NotNull PsiSnippetDocTagValue snippet)