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main.py
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main.py
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import configparser
from functools import partial
from typing import Callable, Dict, List, Optional, Tuple
from django.db.models.fields.related import RelatedField
from mypy.errors import Errors
from mypy.nodes import MypyFile, TypeInfo
from mypy.options import Options
from mypy.plugin import (
AttributeContext, ClassDefContext, DynamicClassDefContext, FunctionContext, MethodContext, Plugin,
)
from mypy.types import Type as MypyType
import mypy_django_plugin.transformers.orm_lookups
from mypy_django_plugin.django.context import DjangoContext
from mypy_django_plugin.lib import fullnames, helpers
from mypy_django_plugin.transformers import (
fields, forms, init_create, meta, querysets, request, settings,
)
from mypy_django_plugin.transformers.managers import (
create_new_manager_class_from_from_queryset_method,
)
from mypy_django_plugin.transformers.models import process_model_class
def transform_model_class(ctx: ClassDefContext,
django_context: DjangoContext) -> None:
sym = ctx.api.lookup_fully_qualified_or_none(fullnames.MODEL_CLASS_FULLNAME)
if sym is not None and isinstance(sym.node, TypeInfo):
helpers.get_django_metadata(sym.node)['model_bases'][ctx.cls.fullname] = 1
else:
if not ctx.api.final_iteration:
ctx.api.defer()
return
process_model_class(ctx, django_context)
def transform_form_class(ctx: ClassDefContext) -> None:
sym = ctx.api.lookup_fully_qualified_or_none(fullnames.BASEFORM_CLASS_FULLNAME)
if sym is not None and isinstance(sym.node, TypeInfo):
helpers.get_django_metadata(sym.node)['baseform_bases'][ctx.cls.fullname] = 1
forms.make_meta_nested_class_inherit_from_any(ctx)
def add_new_manager_base(ctx: ClassDefContext) -> None:
sym = ctx.api.lookup_fully_qualified_or_none(fullnames.MANAGER_CLASS_FULLNAME)
if sym is not None and isinstance(sym.node, TypeInfo):
helpers.get_django_metadata(sym.node)['manager_bases'][ctx.cls.fullname] = 1
def extract_django_settings_module(config_file_path: Optional[str]) -> str:
errors = Errors()
if config_file_path is None:
errors.report(0, None, "'django_settings_module' is not set: no mypy config file specified")
errors.raise_error()
parser = configparser.ConfigParser()
parser.read(config_file_path) # type: ignore
if not parser.has_section('mypy.plugins.django-stubs'):
errors.report(0, None, "'django_settings_module' is not set: no section [mypy.plugins.django-stubs]",
file=config_file_path)
errors.raise_error()
if not parser.has_option('mypy.plugins.django-stubs', 'django_settings_module'):
errors.report(0, None, "'django_settings_module' is not set: setting is not provided",
file=config_file_path)
errors.raise_error()
django_settings_module = parser.get('mypy.plugins.django-stubs', 'django_settings_module').strip('\'"')
return django_settings_module
class NewSemanalDjangoPlugin(Plugin):
def __init__(self, options: Options) -> None:
super().__init__(options)
django_settings_module = extract_django_settings_module(options.config_file)
self.django_context = DjangoContext(django_settings_module)
def _get_current_queryset_bases(self) -> Dict[str, int]:
model_sym = self.lookup_fully_qualified(fullnames.QUERYSET_CLASS_FULLNAME)
if model_sym is not None and isinstance(model_sym.node, TypeInfo):
return (helpers.get_django_metadata(model_sym.node)
.setdefault('queryset_bases', {fullnames.QUERYSET_CLASS_FULLNAME: 1}))
else:
return {}
def _get_current_manager_bases(self) -> Dict[str, int]:
model_sym = self.lookup_fully_qualified(fullnames.MANAGER_CLASS_FULLNAME)
if model_sym is not None and isinstance(model_sym.node, TypeInfo):
return (helpers.get_django_metadata(model_sym.node)
.setdefault('manager_bases', {fullnames.MANAGER_CLASS_FULLNAME: 1}))
else:
return {}
def _get_current_model_bases(self) -> Dict[str, int]:
model_sym = self.lookup_fully_qualified(fullnames.MODEL_CLASS_FULLNAME)
if model_sym is not None and isinstance(model_sym.node, TypeInfo):
return helpers.get_django_metadata(model_sym.node).setdefault('model_bases',
{fullnames.MODEL_CLASS_FULLNAME: 1})
else:
return {}
def _get_current_form_bases(self) -> Dict[str, int]:
model_sym = self.lookup_fully_qualified(fullnames.BASEFORM_CLASS_FULLNAME)
if model_sym is not None and isinstance(model_sym.node, TypeInfo):
return (helpers.get_django_metadata(model_sym.node)
.setdefault('baseform_bases', {fullnames.BASEFORM_CLASS_FULLNAME: 1,
fullnames.FORM_CLASS_FULLNAME: 1,
fullnames.MODELFORM_CLASS_FULLNAME: 1}))
else:
return {}
def _get_typeinfo_or_none(self, class_name: str) -> Optional[TypeInfo]:
sym = self.lookup_fully_qualified(class_name)
if sym is not None and isinstance(sym.node, TypeInfo):
return sym.node
return None
def _new_dependency(self, module: str) -> Tuple[int, str, int]:
return 10, module, -1
def get_additional_deps(self, file: MypyFile) -> List[Tuple[int, str, int]]:
# for settings
if file.fullname == 'django.conf' and self.django_context.django_settings_module:
return [self._new_dependency(self.django_context.django_settings_module)]
# for values / values_list
if file.fullname == 'django.db.models':
return [self._new_dependency('mypy_extensions'), self._new_dependency('typing')]
# for `get_user_model()`
if self.django_context.settings:
if (file.fullname == 'django.contrib.auth'
or file.fullname in {'django.http', 'django.http.request'}):
auth_user_model_name = self.django_context.settings.AUTH_USER_MODEL
try:
auth_user_module = self.django_context.apps_registry.get_model(auth_user_model_name).__module__
except LookupError:
# get_user_model() model app is not installed
return []
return [self._new_dependency(auth_user_module)]
# ensure that all mentioned to='someapp.SomeModel' are loaded with corresponding related Fields
defined_model_classes = self.django_context.model_modules.get(file.fullname)
if not defined_model_classes:
return []
deps = set()
for model_class in defined_model_classes:
# forward relations
for field in self.django_context.get_model_fields(model_class):
if isinstance(field, RelatedField):
related_model_cls = self.django_context.get_field_related_model_cls(field)
if related_model_cls is None:
continue
related_model_module = related_model_cls.__module__
if related_model_module != file.fullname:
deps.add(self._new_dependency(related_model_module))
# reverse relations
for relation in model_class._meta.related_objects:
related_model_cls = self.django_context.get_field_related_model_cls(relation)
related_model_module = related_model_cls.__module__
if related_model_module != file.fullname:
deps.add(self._new_dependency(related_model_module))
return list(deps)
def get_function_hook(self, fullname: str
) -> Optional[Callable[[FunctionContext], MypyType]]:
if fullname == 'django.contrib.auth.get_user_model':
return partial(settings.get_user_model_hook, django_context=self.django_context)
manager_bases = self._get_current_manager_bases()
if fullname in manager_bases:
return querysets.determine_proper_manager_type
info = self._get_typeinfo_or_none(fullname)
if info:
if info.has_base(fullnames.FIELD_FULLNAME):
return partial(fields.transform_into_proper_return_type, django_context=self.django_context)
if helpers.is_model_subclass_info(info, self.django_context):
return partial(init_create.redefine_and_typecheck_model_init, django_context=self.django_context)
return None
def get_method_hook(self, fullname: str
) -> Optional[Callable[[MethodContext], MypyType]]:
class_fullname, _, method_name = fullname.rpartition('.')
if method_name == 'get_form_class':
info = self._get_typeinfo_or_none(class_fullname)
if info and info.has_base(fullnames.FORM_MIXIN_CLASS_FULLNAME):
return forms.extract_proper_type_for_get_form_class
if method_name == 'get_form':
info = self._get_typeinfo_or_none(class_fullname)
if info and info.has_base(fullnames.FORM_MIXIN_CLASS_FULLNAME):
return forms.extract_proper_type_for_get_form
if method_name == 'values':
info = self._get_typeinfo_or_none(class_fullname)
if info and info.has_base(fullnames.QUERYSET_CLASS_FULLNAME):
return partial(querysets.extract_proper_type_queryset_values, django_context=self.django_context)
if method_name == 'values_list':
info = self._get_typeinfo_or_none(class_fullname)
if info and info.has_base(fullnames.QUERYSET_CLASS_FULLNAME):
return partial(querysets.extract_proper_type_queryset_values_list, django_context=self.django_context)
if method_name == 'get_field':
info = self._get_typeinfo_or_none(class_fullname)
if info and info.has_base(fullnames.OPTIONS_CLASS_FULLNAME):
return partial(meta.return_proper_field_type_from_get_field, django_context=self.django_context)
manager_classes = self._get_current_manager_bases()
if class_fullname in manager_classes and method_name == 'create':
return partial(init_create.redefine_and_typecheck_model_create, django_context=self.django_context)
if class_fullname in manager_classes and method_name in {'filter', 'get', 'exclude'}:
return partial(mypy_django_plugin.transformers.orm_lookups.typecheck_queryset_filter,
django_context=self.django_context)
return None
def get_base_class_hook(self, fullname: str
) -> Optional[Callable[[ClassDefContext], None]]:
if (fullname in self.django_context.all_registered_model_class_fullnames
or fullname in self._get_current_model_bases()):
return partial(transform_model_class, django_context=self.django_context)
if fullname in self._get_current_manager_bases():
return add_new_manager_base
if fullname in self._get_current_form_bases():
return transform_form_class
return None
def get_attribute_hook(self, fullname: str
) -> Optional[Callable[[AttributeContext], MypyType]]:
class_name, _, attr_name = fullname.rpartition('.')
if class_name == fullnames.DUMMY_SETTINGS_BASE_CLASS:
return partial(settings.get_type_of_settings_attribute,
django_context=self.django_context)
info = self._get_typeinfo_or_none(class_name)
if info and info.has_base(fullnames.HTTPREQUEST_CLASS_FULLNAME) and attr_name == 'user':
return partial(request.set_auth_user_model_as_type_for_request_user, django_context=self.django_context)
return None
def get_dynamic_class_hook(self, fullname: str
) -> Optional[Callable[[DynamicClassDefContext], None]]:
if fullname.endswith('from_queryset'):
class_name, _, _ = fullname.rpartition('.')
info = self._get_typeinfo_or_none(class_name)
if info and info.has_base(fullnames.BASE_MANAGER_CLASS_FULLNAME):
return create_new_manager_class_from_from_queryset_method
return None
def plugin(version):
return NewSemanalDjangoPlugin