Drop html5lib

news/10825.removal.rst

@@ -0,0 +1 @@
+Remove the ``html5lib`` deprecated feature flag.

news/html5lib.vendor.rst

@@ -0,0 +1 @@
+Remove vendored html5lib.

src/pip/_internal/cli/cmdoptions.py

@@ -1013,7 +1013,6 @@ def check_list_path_option(options: Values) -> None:
     default=[],
     choices=[
         "legacy-resolver",
-        "html5lib",
     ],
     help=("Enable deprecated functionality, that will be removed in the future."),
 )

src/pip/_internal/cli/req_command.py

@@ -499,5 +499,4 @@ def _build_package_finder(
             link_collector=link_collector,
             selection_prefs=selection_prefs,
             target_python=target_python,
-            use_deprecated_html5lib="html5lib" in options.deprecated_features_enabled,
         )

src/pip/_internal/commands/index.py

@@ -97,7 +97,6 @@ def _build_package_finder(
             link_collector=link_collector,
             selection_prefs=selection_prefs,
             target_python=target_python,
-            use_deprecated_html5lib="html5lib" in options.deprecated_features_enabled,
         )
 
     def get_available_package_versions(self, options: Values, args: List[Any]) -> None:

src/pip/_internal/commands/list.py

@@ -149,7 +149,6 @@ def _build_package_finder(
         return PackageFinder.create(
             link_collector=link_collector,
             selection_prefs=selection_prefs,
-            use_deprecated_html5lib="html5lib" in options.deprecated_features_enabled,
         )
 
     def run(self, options: Values, args: List[str]) -> int:

src/pip/_internal/index/collector.py

@@ -29,7 +29,7 @@
     Union,
 )
 
-from pip._vendor import html5lib, requests
+from pip._vendor import requests
 from pip._vendor.requests import Response
 from pip._vendor.requests.exceptions import RetryError, SSLError
 
@@ -191,27 +191,6 @@ def _get_encoding_from_headers(headers: ResponseHeaders) -> Optional[str]:
     return None
 
 
-def _determine_base_url(document: HTMLElement, page_url: str) -> str:
-    """Determine the HTML document's base URL.
-
-    This looks for a ``<base>`` tag in the HTML document. If present, its href
-    attribute denotes the base URL of anchor tags in the document. If there is
-    no such tag (or if it does not have a valid href attribute), the HTML
-    file's URL is used as the base URL.
-
-    :param document: An HTML document representation. The current
-        implementation expects the result of ``html5lib.parse()``.
-    :param page_url: The URL of the HTML document.
-
-    TODO: Remove when `html5lib` is dropped.
-    """
-    for base in document.findall(".//base"):
-        href = base.get("href")
-        if href is not None:
-            return href
-    return page_url
-
-
 def _clean_url_path_part(part: str) -> str:
     """
     Clean a "part" of a URL path (i.e. after splitting on "@" characters).
@@ -313,9 +292,7 @@ def __hash__(self) -> int:
 
 
 class ParseLinks(Protocol):
-    def __call__(
-        self, page: "IndexContent", use_deprecated_html5lib: bool
-    ) -> Iterable[Link]:
+    def __call__(self, page: "IndexContent") -> Iterable[Link]:
         ...
 
 
@@ -327,49 +304,20 @@ def with_cached_index_content(fn: ParseLinks) -> ParseLinks:
     """
 
     @functools.lru_cache(maxsize=None)
-    def wrapper(
-        cacheable_page: CacheablePageContent, use_deprecated_html5lib: bool
-    ) -> List[Link]:
-        return list(fn(cacheable_page.page, use_deprecated_html5lib))
+    def wrapper(cacheable_page: CacheablePageContent) -> List[Link]:
+        return list(fn(cacheable_page.page))
 
     @functools.wraps(fn)
-    def wrapper_wrapper(
-        page: "IndexContent", use_deprecated_html5lib: bool
-    ) -> List[Link]:
+    def wrapper_wrapper(page: "IndexContent") -> List[Link]:
         if page.cache_link_parsing:
-            return wrapper(CacheablePageContent(page), use_deprecated_html5lib)
-        return list(fn(page, use_deprecated_html5lib))
+            return wrapper(CacheablePageContent(page))
+        return list(fn(page))
 
     return wrapper_wrapper
 
 
-def _parse_links_html5lib(page: "IndexContent") -> Iterable[Link]:
-    """
-    Parse an HTML document, and yield its anchor elements as Link objects.
-
-    TODO: Remove when `html5lib` is dropped.
-    """
-    document = html5lib.parse(
-        page.content,
-        transport_encoding=page.encoding,
-        namespaceHTMLElements=False,
-    )
-
-    url = page.url
-    base_url = _determine_base_url(document, url)
-    for anchor in document.findall(".//a"):
-        link = _create_link_from_element(
-            anchor.attrib,
-            page_url=url,
-            base_url=base_url,
-        )
-        if link is None:
-            continue
-        yield link
-
-
 @with_cached_index_content
-def parse_links(page: "IndexContent", use_deprecated_html5lib: bool) -> Iterable[Link]:
+def parse_links(page: "IndexContent") -> Iterable[Link]:
     """
     Parse a Simple API's Index Content, and yield its anchor elements as Link objects.
     """
@@ -398,10 +346,6 @@ def parse_links(page: "IndexContent", use_deprecated_html5lib: bool) -> Iterable
                 hashes=file.get("hashes", {}),
             )
 
-    if use_deprecated_html5lib:
-        yield from _parse_links_html5lib(page)
-        return
-
     parser = HTMLLinkParser(page.url)
     encoding = page.encoding or "utf-8"
     parser.feed(page.content.decode(encoding))

src/pip/_internal/index/package_finder.py

@@ -598,7 +598,6 @@ def __init__(
         link_collector: LinkCollector,
         target_python: TargetPython,
         allow_yanked: bool,
-        use_deprecated_html5lib: bool,
         format_control: Optional[FormatControl] = None,
         candidate_prefs: Optional[CandidatePreferences] = None,
         ignore_requires_python: Optional[bool] = None,
@@ -623,7 +622,6 @@ def __init__(
         self._ignore_requires_python = ignore_requires_python
         self._link_collector = link_collector
         self._target_python = target_python
-        self._use_deprecated_html5lib = use_deprecated_html5lib
 
         self.format_control = format_control
 
@@ -640,8 +638,6 @@ def create(
         link_collector: LinkCollector,
         selection_prefs: SelectionPreferences,
         target_python: Optional[TargetPython] = None,
-        *,
-        use_deprecated_html5lib: bool,
     ) -> "PackageFinder":
         """Create a PackageFinder.
 
@@ -666,7 +662,6 @@ def create(
             allow_yanked=selection_prefs.allow_yanked,
             format_control=selection_prefs.format_control,
             ignore_requires_python=selection_prefs.ignore_requires_python,
-            use_deprecated_html5lib=use_deprecated_html5lib,
         )
 
     @property
@@ -796,7 +791,7 @@ def process_project_url(
         if index_response is None:
             return []
 
-        page_links = list(parse_links(index_response, self._use_deprecated_html5lib))
+        page_links = list(parse_links(index_response))
 
         with indent_log():
             package_links = self.evaluate_links(

src/pip/_internal/self_outdated_check.py

@@ -173,7 +173,6 @@ def _get_current_remote_pip_version(
     finder = PackageFinder.create(
         link_collector=link_collector,
         selection_prefs=selection_prefs,
-        use_deprecated_html5lib=("html5lib" in options.deprecated_features_enabled),
     )
     best_candidate = finder.find_best_candidate("pip").best_candidate
     if best_candidate is None:

src/pip/_vendor/README.rst

@@ -104,9 +104,6 @@ Modifications
   rather than ``appdirs``.
 * ``packaging`` has been modified to import its dependencies from
   ``pip._vendor``.
-* ``html5lib`` has been modified to import six from ``pip._vendor``, to prefer
-  importing from ``collections.abc`` instead of ``collections`` and does not
-  import ``xml.etree.cElementTree`` on Python 3.
 * ``CacheControl`` has been modified to import its dependencies from
   ``pip._vendor``.
 * ``requests`` has been modified to import its other dependencies from

src/pip/_vendor/__init__.py

@@ -63,7 +63,6 @@ def vendored(modulename):
     vendored("colorama")
     vendored("distlib")
     vendored("distro")
-    vendored("html5lib")
     vendored("six")
     vendored("six.moves")
     vendored("six.moves.urllib")