code: def get_inventory_and_name_suffix(
      self, name: str
  ) -> tuple[str | None, str]:
      assert name.startswith("external"), name
      # either we have an explicit inventory name, i.e,
      # :external+inv:role:        or
      # :external+inv:domain:role:
      # or we look in all inventories, i.e.,
      # :external:role:            or
      # :external:domain:role:
      suffix = name[9:]
      if name[8] == "+":
          inv_name, suffix = suffix.split(":", 1)
          return inv_name, suffix
      elif name[8] == ":":
          return None, suffix
      else:
          msg = f"Malformed :external: role name: {name}"
          raise ValueError(msg)
  
imports: from __future__ import annotations
  import concurrent.futures
  import functools
  import posixpath
  import re
  import sys
  import time
  from os import path
  from typing import TYPE_CHECKING, cast
  from urllib.parse import urlsplit, urlunsplit
  from docutils import nodes
  from docutils.utils import relative_path
  import sphinx
  from sphinx.addnodes import pending_xref
  from sphinx.builders.html import INVENTORY_FILENAME
  from sphinx.errors import ExtensionError
  from sphinx.locale import _, __
  from sphinx.transforms.post_transforms import ReferencesResolver
  from sphinx.util import logging, requests
  from sphinx.util.docutils import CustomReSTDispatcher, SphinxRole
  from sphinx.util.inventory import InventoryFile
label_desc: Use image node_id 3 for calling the IntersphinxRole obj's underlying member method code with example usage: obj.get_inventory_and_name_suffix(name) and returns: inv_name,  suffix, None,  suffix