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# Domain API

class `sphinx.domains.``Domain`(env)

  A Domain is meant to be a group of “object” description directives for objects of a similar nature, and corresponding roles to create references to them. Examples would be Python modules, classes, functions etc., elements of a templating language, Sphinx roles and directives, etc.

  Each domain has a separate storage for information about existing objects and how to reference them in self.data, which must be a dictionary. It also must implement several functions that expose the object information in a uniform way to parts of Sphinx that allow the user to reference or search for objects in a domain-agnostic way.

  About self.data: since all object and cross-referencing information is stored on a BuildEnvironment instance, the domain.data object is also stored in the env.domaindata dict under the key domain.name. Before the build process starts, every active domain is instantiated and given the environment object; the domaindata dict must then either be nonexistent or a dictionary whose ‘version’ key is equal to the domain class’ `data_version` attribute. Otherwise, IOError is raised and the pickled environment is discarded.

  `clear_doc`(docname)

    Remove traces of a document in the domain-specific inventories.

  `directive`(name)

    Return a directive adapter class that always gives the registered directive its full name (‘domain:name’) as `self.name`.

  `get_objects`()

    Return an iterable of “object descriptions”, which are tuples with five items:

    - name – fully qualified name
    - dispname – name to display when searching/linking
    - type – object type, a key in `self.object_types`
    - docname – the document where it is to be found
    - anchor – the anchor name for the object
    - priority – how “important” the object is (determines placement in search results)
      - 1: default priority (placed before full-text matches)
      - 0: object is important (placed before default-priority objects)
      - 2: object is unimportant (placed after full-text matches)
      - -1: object should not show up in search at all
  `get_type_name`(type, primary=False)

    Return full name for given ObjType.

  `merge_domaindata`(docnames, otherdata)

    Merge in data regarding docnames from a different domaindata inventory (coming from a subprocess in parallel builds).

  `process_doc`(env, docname, document)

    Process a document after it is read by the environment.

  `resolve_any_xref`(env, fromdocname, builder, target, node, contnode)

    Resolve the pending_xref node with the given target.

    The reference comes from an “any” or similar role, which means that we don’t know the type. Otherwise, the arguments are the same as for `resolve_xref()`.

    The method must return a list (potentially empty) of tuples `('domain:role', newnode)`, where `'domain:role'` is the name of a role that could have created the same reference, e.g. `'py:func'`. `newnode` is what `resolve_xref()` would return.

    New in version 1.3.

  `resolve_xref`(env, fromdocname, builder, typ, target, node, contnode)

    Resolve the pending_xref node with the given typ and target.

    This method should return a new node, to replace the xref node, containing the contnode which is the markup content of the cross-reference.

    If no resolution can be found, None can be returned; the xref node will then given to the ‘missing-reference’ event, and if that yields no resolution, replaced by contnode.

    The method can also raise `sphinx.environment.NoUri` to suppress the ‘missing-reference’ event being emitted.

  `role`(name)

    Return a role adapter function that always gives the registered role its full name (‘domain:name’) as the first argument.

  `dangling_warnings` = {}

    role name -> a warning message if reference is missing

  `data_version` = 0

    data version, bump this when the format of self.data changes

  `directives` = {}

    directive name -> directive class

  `indices` = []

    a list of Index subclasses

  `initial_data` = {}

    data value for a fresh environment

  `label` = ''

    domain label: longer, more descriptive (used in messages)

  `name` = ''

    domain name: should be short, but unique

  `object_types` = {}

    type (usually directive) name -> ObjType instance

  `roles` = {}

    role name -> role callable

class `sphinx.domains.``ObjType`(lname, *roles, **attrs)

  An ObjType is the description for a type of object that a domain can document. In the object_types attribute of Domain subclasses, object type names are mapped to instances of this class.

  Constructor arguments:

  - lname: localized name of the type (do not include domain name)
  - roles: all the roles that can refer to an object of this type
  - attrs: object attributes – currently only “searchprio” is known, which defines the object’s priority in the full-text search index, see `Domain.get_objects()`.

class `sphinx.domains.``Index`(domain)

  An Index is the description for a domain-specific index. To add an index to a domain, subclass Index, overriding the three name attributes:

  - name is an identifier used for generating file names.
  - localname is the section title for the index.
  - shortname is a short name for the index, for use in the relation bar in HTML output. Can be empty to disable entries in the relation bar.

  and providing a `generate()` method. Then, add the index class to your domain’s indices list. Extensions can add indices to existing domains using `add_index_to_domain()`.

  `generate`(docnames=None)

    Return entries for the index given by name. If docnames is given, restrict to entries referring to these docnames.

    The return value is a tuple of `(content, collapse)`, where collapse is a boolean that determines if sub-entries should start collapsed (for output formats that support collapsing sub-entries).

    content is a sequence of `(letter, entries)` tuples, where letter is the “heading” for the given entries, usually the starting letter.

    entries is a sequence of single entries, where a single entry is a sequence `[name, subtype, docname, anchor, extra, qualifier, descr]`. The items in this sequence have the following meaning:

    - name – the name of the index entry to be displayed
    - subtype – sub-entry related type: 0 – normal entry 1 – entry with sub-entries 2 – sub-entry
    - docname – docname where the entry is located
    - anchor – anchor for the entry within docname
    - extra – extra info for the entry
    - qualifier – qualifier for the description
    - descr – description for the entry

    Qualifier and description are not rendered e.g. in LaTeX output.