mirror of
https://github.com/davidhalter/django-stubs.git
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119 lines
5.0 KiB
Python
119 lines
5.0 KiB
Python
from typing import Optional, Tuple, cast
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from django.db.models.fields import Field
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from django.db.models.fields.related import RelatedField
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from mypy.nodes import AssignmentStmt, TypeInfo, NameExpr
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from mypy.plugin import FunctionContext
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from mypy.types import AnyType, Instance
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from mypy.types import Type as MypyType
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from mypy.types import TypeOfAny
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from mypy_django_plugin.django.context import DjangoContext
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from mypy_django_plugin.lib import fullnames, helpers
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def _get_current_field_from_assignment(ctx: FunctionContext, django_context: DjangoContext) -> Optional[Field]:
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outer_model_info = helpers.get_typechecker_api(ctx).scope.active_class()
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if (outer_model_info is None
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or not outer_model_info.has_base(fullnames.MODEL_CLASS_FULLNAME)):
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return None
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field_name = None
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for stmt in outer_model_info.defn.defs.body:
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if isinstance(stmt, AssignmentStmt):
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if stmt.rvalue == ctx.context:
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assert isinstance(stmt.lvalues[0], NameExpr)
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field_name = stmt.lvalues[0].name
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break
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if field_name is None:
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return None
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model_cls = django_context.get_model_class_by_fullname(outer_model_info.fullname())
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if model_cls is None:
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return None
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current_field = model_cls._meta.get_field(field_name)
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return current_field
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def fill_descriptor_types_for_related_field(ctx: FunctionContext, django_context: DjangoContext) -> MypyType:
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current_field = _get_current_field_from_assignment(ctx, django_context)
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if current_field is None:
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return AnyType(TypeOfAny.from_error)
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assert isinstance(current_field, RelatedField)
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related_model = related_model_to_set = current_field.related_model
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if related_model_to_set._meta.proxy_for_model:
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related_model_to_set = related_model._meta.proxy_for_model
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typechecker_api = helpers.get_typechecker_api(ctx)
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related_model_info = helpers.lookup_class_typeinfo(typechecker_api, related_model)
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assert isinstance(related_model_info, TypeInfo)
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related_model_to_set_info = helpers.lookup_class_typeinfo(typechecker_api, related_model_to_set)
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assert isinstance(related_model_to_set_info, TypeInfo)
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default_related_field_type = set_descriptor_types_for_field(ctx)
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# replace Any with referred_to_type
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args = [
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helpers.convert_any_to_type(default_related_field_type.args[0], Instance(related_model_to_set_info, [])),
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helpers.convert_any_to_type(default_related_field_type.args[1], Instance(related_model_info, [])),
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]
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return helpers.reparametrize_instance(default_related_field_type, new_args=args)
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def get_field_descriptor_types(field_info: TypeInfo, is_nullable: bool) -> Tuple[MypyType, MypyType]:
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set_type = helpers.get_private_descriptor_type(field_info, '_pyi_private_set_type',
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is_nullable=is_nullable)
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get_type = helpers.get_private_descriptor_type(field_info, '_pyi_private_get_type',
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is_nullable=is_nullable)
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return set_type, get_type
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def set_descriptor_types_for_field(ctx: FunctionContext) -> Instance:
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default_return_type = cast(Instance, ctx.default_return_type)
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is_nullable = False
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null_expr = helpers.get_call_argument_by_name(ctx, 'null')
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if null_expr is not None:
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is_nullable = helpers.parse_bool(null_expr) or False
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set_type, get_type = get_field_descriptor_types(default_return_type.type, is_nullable)
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return helpers.reparametrize_instance(default_return_type, [set_type, get_type])
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def determine_type_of_array_field(ctx: FunctionContext, django_context: DjangoContext) -> MypyType:
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default_return_type = set_descriptor_types_for_field(ctx)
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base_field_arg_type = helpers.get_call_argument_type_by_name(ctx, 'base_field')
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if not base_field_arg_type or not isinstance(base_field_arg_type, Instance):
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return default_return_type
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base_type = base_field_arg_type.args[1] # extract __get__ type
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args = []
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for default_arg in default_return_type.args:
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args.append(helpers.convert_any_to_type(default_arg, base_type))
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return helpers.reparametrize_instance(default_return_type, args)
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def transform_into_proper_return_type(ctx: FunctionContext, django_context: DjangoContext) -> MypyType:
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default_return_type = ctx.default_return_type
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assert isinstance(default_return_type, Instance)
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outer_model_info = helpers.get_typechecker_api(ctx).scope.active_class()
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if not outer_model_info or not outer_model_info.has_base(fullnames.MODEL_CLASS_FULLNAME):
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# not inside models.Model class
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return ctx.default_return_type
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assert isinstance(outer_model_info, TypeInfo)
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if helpers.has_any_of_bases(default_return_type.type, fullnames.RELATED_FIELDS_CLASSES):
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return fill_descriptor_types_for_related_field(ctx, django_context)
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if default_return_type.type.has_base(fullnames.ARRAY_FIELD_FULLNAME):
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return determine_type_of_array_field(ctx, django_context)
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return set_descriptor_types_for_field(ctx)
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