Reference to the :class:`.Sphinx` (application) object.

  Reference to the :class:`.Config` object.

  Target project.  See :class:`.Project`.

  Source directory.

  Directory for storing pickled doctrees.

  An :class:`.EventManager` object.

  A set of all existing docnames.

  Dictionary mapping docnames to "metadata" (see :ref:`metadata`).

  Dictionary mapping docnames to the docutils node for their main title.

  Temporary data storage while reading a document.

  Extensions may use the mapping interface provided by
  ``env.current_document`` to store data relating to the current document,
  but should use a unique prefix to avoid name clashes.

  .. important::
     Only the following attributes constitute the public API.
     The type itself and any methods or other attributes remain private,
     experimental, and will be changed or removed without notice.

  .. attribute:: current_document.docname
     :type: str

     The document name ('docname') for the current document.

  .. attribute:: current_document.default_role
     :type: str

     The default role for the current document.
     Set by the :dudir:`default-role` directive.

  .. attribute:: current_document.default_domain
     :type: Domain | None

     The default domain for the current document.
     Set by the :rst:dir:`default-domain` directive.

  .. attribute:: current_document.highlight_language
     :type: str

     The default language for syntax highlighting.
     Set by the :rst:dir:`highlight` directive to override
     the :confval:`highlight_language` config value.

  .. attribute:: current_document._parser
     :type: Parser | None

     *This attribute is experimental and may be changed without notice.*

     The parser being used to parse the current document.