plugin ¤

def get_item_url(
    self,
    identifier: str,
    from_url: str | None = None,
    # YORE: Bump 2: Remove line.
    fallback: Callable[[str], Sequence[str]] | None = None,
) -> str:
    """Return a site-relative URL with anchor to the identifier, if it's present anywhere.

    Arguments:
        identifier: The anchor (without '#').
        from_url: The URL of the base page, from which we link towards the targeted pages.

    Returns:
        A site-relative URL.
    """
    # YORE: Bump 2: Replace `, fallback` with `` within line.
    url = self._get_item_url(identifier, from_url, fallback)
    if from_url is not None:
        parsed = urlsplit(url)
        if not parsed.scheme and not parsed.netloc:
            return relative_url(from_url, url)
    return url

def map_urls(self, base_url: str, anchor: AnchorLink) -> None:
    """Recurse on every anchor to map its ID to its absolute URL.

    This method populates `self._primary_url_map` by side-effect.

    Arguments:
        base_url: The base URL to use as a prefix for each anchor's relative URL.
        anchor: The anchor to process and to recurse on.
    """
    self.register_anchor(base_url, anchor.id, primary=True)
    for child in anchor.children:
        self.map_urls(base_url, child)

def on_config(self, config: MkDocsConfig) -> MkDocsConfig | None:
    """Instantiate our Markdown extension.

    Hook for the [`on_config` event](https://www.mkdocs.org/user-guide/plugins/#on_config).
    In this hook, we instantiate our [`AutorefsExtension`][mkdocs_autorefs.references.AutorefsExtension]
    and add it to the list of Markdown extensions used by `mkdocs`.

    Arguments:
        config: The MkDocs config object.

    Returns:
        The modified config.
    """
    log.debug("Adding AutorefsExtension to the list")
    config["markdown_extensions"].append(AutorefsExtension(self))
    return config

def on_page_content(self, html: str, page: Page, **kwargs: Any) -> str:  # noqa: ARG002
    """Map anchors to URLs.

    Hook for the [`on_page_content` event](https://www.mkdocs.org/user-guide/plugins/#on_page_content).
    In this hook, we map the IDs of every anchor found in the table of contents to the anchors absolute URLs.
    This mapping will be used later to fix unresolved reference of the form `[title][identifier]` or
    `[identifier][]`.

    Arguments:
        html: HTML converted from Markdown.
        page: The related MkDocs page instance.
        kwargs: Additional arguments passed by MkDocs.

    Returns:
        The same HTML. We only use this hook to map anchors to URLs.
    """
    if self.scan_toc:
        log.debug("Mapping identifiers to URLs for page %s", page.file.src_path)
        for item in page.toc.items:
            self.map_urls(page.url, item)
    return html

def on_page_markdown(self, markdown: str, page: Page, **kwargs: Any) -> str:  # noqa: ARG002
    """Remember which page is the current one.

    Arguments:
        markdown: Input Markdown.
        page: The related MkDocs page instance.
        kwargs: Additional arguments passed by MkDocs.

    Returns:
        The same Markdown. We only use this hook to keep a reference to the current page URL,
            used during Markdown conversion by the anchor scanner tree processor.
    """
    self.current_page = page.url
    return markdown

def on_post_page(self, output: str, page: Page, **kwargs: Any) -> str:  # noqa: ARG002
    """Fix cross-references.

    Hook for the [`on_post_page` event](https://www.mkdocs.org/user-guide/plugins/#on_post_page).
    In this hook, we try to fix unresolved references of the form `[title][identifier]` or `[identifier][]`.
    Doing that allows the user of `autorefs` to cross-reference objects in their documentation strings.
    It uses the native Markdown syntax so it's easy to remember and use.

    We log a warning for each reference that we couldn't map to an URL, but try to be smart and ignore identifiers
    that do not look legitimate (sometimes documentation can contain strings matching
    our [`AUTO_REF_RE`][mkdocs_autorefs.references.AUTO_REF_RE] regular expression that did not intend to reference anything).
    We currently ignore references when their identifier contains a space or a slash.

    Arguments:
        output: HTML converted from Markdown.
        page: The related MkDocs page instance.
        kwargs: Additional arguments passed by MkDocs.

    Returns:
        Modified HTML.
    """
    log.debug("Fixing references in page %s", page.file.src_path)

    # YORE: Bump 2: Replace `, fallback=self.get_fallback_anchor` with `` within line.
    url_mapper = functools.partial(self.get_item_url, from_url=page.url, fallback=self.get_fallback_anchor)
    # YORE: Bump 2: Replace `, _legacy_refs=self.legacy_refs` with `` within line.
    fixed_output, unmapped = fix_refs(output, url_mapper, _legacy_refs=self.legacy_refs)

    if unmapped and log.isEnabledFor(logging.WARNING):
        for ref, context in unmapped:
            message = f"from {context.filepath}:{context.lineno}: ({context.origin}) " if context else ""
            log.warning(f"{page.file.src_path}: {message}Could not find cross-reference target '{ref}'")

    return fixed_output

def register_anchor(self, page: str, identifier: str, anchor: str | None = None, *, primary: bool = True) -> None:
    """Register that an anchor corresponding to an identifier was encountered when rendering the page.

    Arguments:
        page: The relative URL of the current page. Examples: `'foo/bar/'`, `'foo/index.html'`
        identifier: The identifier to register.
        anchor: The anchor on the page, without `#`. If not provided, defaults to the identifier.
        primary: Whether this anchor is the primary one for the identifier.
    """
    page_anchor = f"{page}#{anchor or identifier}"
    url_map = self._primary_url_map if primary else self._secondary_url_map
    if identifier in url_map:
        if page_anchor not in url_map[identifier]:
            url_map[identifier].append(page_anchor)
    else:
        url_map[identifier] = [page_anchor]

def register_url(self, identifier: str, url: str) -> None:
    """Register that the identifier should be turned into a link to this URL.

    Arguments:
        identifier: The new identifier.
        url: The absolute URL (including anchor, if needed) where this item can be found.
    """
    self._abs_url_map[identifier] = url