[spelling] Ignore spelling in type/mypy type ignore comments (#8370)

enchant does not understand class name well enough so it creates false
positives, and mypy type ignore comments with additional text are
a syntax error anyway, so raising a spelling mistakes for it is not
really important.

Author: Pierre-Sassoulas

doc/whatsnew/fragments/8370.false_positive

@@ -0,0 +1,3 @@
+Fix false positive for ``wrong-spelling-in-comment`` with class names in a python 2 type comment.
+
+Closes #8370

pylint/checkers/spelling.py

@@ -191,7 +191,6 @@ def _next(self) -> tuple[str, Literal[0]]:
 
 
 CODE_FLANKED_IN_BACKTICK_REGEX = re.compile(r"(\s|^)(`{1,2})([^`]+)(\2)([^`]|$)")
-MYPY_IGNORE_DIRECTIVE_RULE_REGEX = re.compile(r"(\s|^)(type\: ignore\[[^\]]+\])(.*)")
 
 
 def _strip_code_flanked_in_backticks(line: str) -> str:
@@ -209,23 +208,6 @@ def replace_code_but_leave_surrounding_characters(match_obj: re.Match[str]) -> s
     )
 
 
-def _strip_mypy_ignore_directive_rule(line: str) -> str:
-    """Alter line so mypy rule name is ignored.
-
-    Pyenchant parses anything flanked by spaces as an individual token,
-    so this cannot be done at the individual filter level.
-    """
-
-    def replace_rule_name_but_leave_surrounding_characters(
-        match_obj: re.Match[str],
-    ) -> str:
-        return match_obj.group(1) + match_obj.group(3)
-
-    return MYPY_IGNORE_DIRECTIVE_RULE_REGEX.sub(
-        replace_rule_name_but_leave_surrounding_characters, line
-    )
-
-
 class SpellingChecker(BaseTokenChecker):
     """Check spelling in comments and docstrings."""
 
@@ -380,7 +362,6 @@ def _check_spelling(self, msgid: str, line: str, line_num: int) -> None:
             starts_with_comment = False
 
         line = _strip_code_flanked_in_backticks(line)
-        line = _strip_mypy_ignore_directive_rule(line)
 
         for word, word_start_at in self.tokenizer(line.strip()):
             word_start_at += initial_space
@@ -454,6 +435,10 @@ def process_tokens(self, tokens: list[tokenize.TokenInfo]) -> None:
                 if token.startswith("# pylint:"):
                     # Skip pylint enable/disable comments
                     continue
+                if token.startswith("# type: "):
+                    # Skip python 2 type comments and mypy type ignore comments
+                    # mypy do not support additional text in type comments
+                    continue
                 self._check_spelling("wrong-spelling-in-comment", token, start_row)
 
     @only_required_for_messages("wrong-spelling-in-docstring")

tests/checkers/unittest_spelling.py

@@ -258,6 +258,27 @@ def test_skip_urls(self) -> None:
         self.checker.process_tokens(_tokenize_str("# https://github.com/rfk/pyenchant"))
         assert not self.linter.release_messages()
 
+    @skip_on_missing_package_or_dict
+    @set_config(spelling_dict=spell_dict)
+    @pytest.mark.parametrize(
+        "type_comment",
+        [
+            "# type: (NotAWord) -> NotAWord",
+            "# type: List[NotAWord] -> List[NotAWord]",
+            "# type: Dict[NotAWord] -> Dict[NotAWord]",
+            "# type: NotAWord",
+            "# type: List[NotAWord]",
+            "# type: Dict[NotAWord]",
+            "# type: ImmutableList[Manager]",
+            # will result in error: Invalid "type: ignore" comment  [syntax]
+            # when analyzed with mypy 1.02
+            "# type: ignore[attr-defined] NotAWord",
+        ],
+    )
+    def test_skip_type_comments(self, type_comment: str) -> None:
+        self.checker.process_tokens(_tokenize_str(type_comment))
+        assert not self.linter.release_messages()
+
     @skip_on_missing_package_or_dict
     @set_config(spelling_dict=spell_dict)
     def test_skip_sphinx_directives(self) -> None:
@@ -363,24 +384,6 @@ def test_skip_code_flanked_in_single_backticks(self) -> None:
         ):
             self.checker.process_tokens(_tokenize_str(full_comment))
 
-    @skip_on_missing_package_or_dict
-    @set_config(spelling_dict=spell_dict)
-    def test_skip_mypy_ignore_directives(self) -> None:
-        full_comment = "# type: ignore[attr-defined] attr"
-        with self.assertAddsMessages(
-            MessageTest(
-                "wrong-spelling-in-comment",
-                line=1,
-                args=(
-                    "attr",
-                    full_comment,
-                    "   ^^^^",
-                    self._get_msg_suggestions("attr"),
-                ),
-            )
-        ):
-            self.checker.process_tokens(_tokenize_str(full_comment))
-
     @skip_on_missing_package_or_dict
     @set_config(
         spelling_dict=spell_dict,