Extend _ErrorLog definitions (GH-100)

Add missing public class attributes, properties and methods for ``_LogEntry`` and ``_ErrorLog``

lxml-stubs/etree.pyi

@@ -24,7 +24,14 @@ from typing import (
     overload,
 )
 
-from typing_extensions import Literal, Protocol, SupportsIndex, TypeAlias, TypeGuard
+from typing_extensions import (
+    Literal,
+    Protocol,
+    Self,
+    SupportsIndex,
+    TypeAlias,
+    TypeGuard,
+)
 
 # dummy for missing stubs
 def __getattr__(name: str) -> Any: ...
@@ -374,7 +381,7 @@ class CustomElementClassLookup(FallbackElementClassLookup):
 
 class _BaseParser:
     def __getattr__(self, name: str) -> Any: ...  # Incomplete
-    def copy(self) -> _BaseParser: ...
+    def copy(self) -> Self: ...
     def makeelement(
         self,
         _tag: _TagName,
@@ -577,7 +584,42 @@ def tostring(
     inclusive_ns_prefixes: Any = ...,
 ) -> _AnyStr: ...
 
-class _ErrorLog: ...
+class _LogEntry:
+    column: int
+    domain: int
+    level: int
+    line: int
+    path: Optional[str]
+    type: int
+    @property
+    def domain_name(self) -> str: ...
+    @property
+    def filename(self) -> Optional[str]: ...
+    @property
+    def level_name(self) -> str: ...
+    @property
+    def message(self) -> Optional[str]: ...
+    @property
+    def type_name(self) -> str: ...
+
+class _BaseErrorLog:
+    last_error: _LogEntry
+    def copy(self) -> Self: ...
+    def receive(self, entry: _LogEntry) -> None: ...
+
+class _ListErrorLog(_BaseErrorLog):
+    def __iter__(self) -> Iterator["_LogEntry"]: ...
+    def filter_domains(self, domains: Union[int, Iterable[int]]) -> Self: ...
+    def filter_from_errors(self) -> Self: ...
+    def filter_from_fatals(self) -> Self: ...
+    def filter_from_level(self, level: int) -> Self: ...
+    def filter_from_warnings(self) -> Self: ...
+    def filter_levels(self, levels: Union[int, Iterable[int]]) -> Self: ...
+    def filter_types(self, types: Union[int, Iterable[int]]) -> Self: ...
+
+class _ErrorLog(_ListErrorLog):
+    def clear(self) -> None: ...
+
 class Error(Exception): ...
 
 class LxmlError(Error):