HTMLParser: Add missing stubs for attributes and methods (#6658)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

stdlib/_markupbase.pyi

@@ -1,6 +1,17 @@
+import sys
+from typing import NoReturn
+
 class ParserBase:
     def __init__(self) -> None: ...
-    def error(self, message: str) -> None: ...
     def reset(self) -> None: ...
     def getpos(self) -> tuple[int, int]: ...
     def unknown_decl(self, data: str) -> None: ...
+    def parse_comment(self, i: int, report: int = ...) -> int: ...  # undocumented
+    def parse_declaration(self, i: int) -> int: ...  # undocumented
+    def parse_marked_section(self, i: int, report: int = ...) -> int: ...  # undocumented
+    def updatepos(self, i: int, j: int) -> int: ...  # undocumented
+    if sys.version_info < (3, 10):
+        # Removed from ParserBase: https://bugs.python.org/issue31844
+        def error(self, message: str) -> NoReturn: ...  # undocumented
+    lineno: int  # undocumented
+    offset: int  # undocumented

stdlib/html/parser.pyi

@@ -1,5 +1,5 @@
 from _markupbase import ParserBase
-from typing import Tuple
+from typing import Pattern, Tuple
 
 class HTMLParser(ParserBase):
     def __init__(self, *, convert_charrefs: bool = ...) -> None: ...
@@ -28,3 +28,8 @@ class HTMLParser(ParserBase):
     def parse_pi(self, i: int) -> int: ...  # undocumented
     def parse_starttag(self, i: int) -> int: ...  # undocumented
     def set_cdata_mode(self, elem: str) -> None: ...  # undocumented
+    rawdata: str  # undocumented
+    cdata_elem: str | None  # undocumented
+    convert_charrefs: bool  # undocumented
+    interesting: Pattern[str]  # undocumented
+    lasttag: str  # undocumented

tests/stubtest_allowlists/py310.txt

@@ -121,7 +121,6 @@ pstats.SortKey.__new__
 tkinter.EventType.__new__
 
 # Rest of these errors are new in Python 3.10:
-_markupbase.ParserBase.error
 asyncio.proactor_events._ProactorReadPipeTransport.__init__
 distutils.command.bdist_wininst
 py_compile.main

tests/stubtest_allowlists/py3_common.txt

@@ -546,10 +546,6 @@ pkgutil.ImpLoader.source
 # ==========
 __main__.\w+
 _json.encode_basestring
-_markupbase.ParserBase.parse_comment
-_markupbase.ParserBase.parse_declaration
-_markupbase.ParserBase.parse_marked_section
-_markupbase.ParserBase.updatepos
 _thread.LockType.acquire_lock
 _thread.LockType.locked_lock
 _thread.LockType.release_lock