Revert "Use parse_bool implementation from mypy" (#1792)

* Revert "Use `parse_bool` implementation from mypy"

This reverts commit a6b3ba9

* Add comment

mypy_django_plugin/lib/helpers.py

@@ -35,7 +35,6 @@
     SemanticAnalyzerPluginInterface,
 )
 from mypy.semanal import SemanticAnalyzer
-from mypy.semanal_shared import parse_bool
 from mypy.types import AnyType, Instance, LiteralType, NoneTyp, TupleType, TypedDictType, TypeOfAny, UnionType
 from mypy.types import Type as MypyType
 from typing_extensions import TypedDict
@@ -176,6 +175,16 @@ def make_optional(typ: MypyType) -> MypyType:
     return UnionType.make_union([typ, NoneTyp()])
 
 
+# Duplicating mypy.semanal_shared.parse_bool because importing it directly caused ImportError (#1784)
+def parse_bool(expr: Expression) -> Optional[bool]:
+    if isinstance(expr, NameExpr):
+        if expr.fullname == "builtins.True":
+            return True
+        if expr.fullname == "builtins.False":
+            return False
+    return None
+
+
 def has_any_of_bases(info: TypeInfo, bases: Iterable[str]) -> bool:
     for base_fullname in bases:
         if info.has_base(base_fullname):

mypy_django_plugin/transformers/fields.py

@@ -6,13 +6,13 @@
 from django.db.models.fields.reverse_related import ForeignObjectRel
 from mypy.nodes import AssignmentStmt, NameExpr, TypeInfo
 from mypy.plugin import FunctionContext
-from mypy.semanal_shared import parse_bool
 from mypy.types import AnyType, Instance, ProperType, TypeOfAny, UnionType
 from mypy.types import Type as MypyType
 
 from mypy_django_plugin.django.context import DjangoContext
 from mypy_django_plugin.exceptions import UnregisteredModelError
 from mypy_django_plugin.lib import fullnames, helpers
+from mypy_django_plugin.lib.helpers import parse_bool
 from mypy_django_plugin.transformers import manytomany
 
 if TYPE_CHECKING:

mypy_django_plugin/transformers/querysets.py

@@ -7,14 +7,13 @@
 from django.db.models.fields.reverse_related import ForeignObjectRel
 from mypy.nodes import ARG_NAMED, ARG_NAMED_OPT, Expression
 from mypy.plugin import FunctionContext, MethodContext
-from mypy.semanal_shared import parse_bool
 from mypy.types import AnyType, Instance, TupleType, TypedDictType, TypeOfAny, get_proper_type
 from mypy.types import Type as MypyType
 
 from mypy_django_plugin.django.context import DjangoContext, LookupsAreUnsupported
 from mypy_django_plugin.lib import fullnames, helpers
 from mypy_django_plugin.lib.fullnames import ANY_ATTR_ALLOWED_CLASS_FULLNAME
-from mypy_django_plugin.lib.helpers import is_annotated_model_fullname
+from mypy_django_plugin.lib.helpers import is_annotated_model_fullname, parse_bool
 from mypy_django_plugin.transformers.models import get_or_create_annotated_type