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checker_shared.py
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370 lines (316 loc) · 10.5 KB
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"""Shared definitions used by different parts of type checker."""
from __future__ import annotations
from abc import abstractmethod
from collections.abc import Iterator, Sequence, Set as AbstractSet
from contextlib import contextmanager
from typing import NamedTuple, overload
from mypy_extensions import trait
from mypy.errorcodes import ErrorCode
from mypy.errors import ErrorWatcher
from mypy.message_registry import ErrorMessage
from mypy.nodes import (
ArgKind,
Context,
Expression,
FuncItem,
LambdaExpr,
MypyFile,
Node,
RefExpr,
SymbolNode,
TypeInfo,
Var,
)
from mypy.plugin import CheckerPluginInterface, Plugin
from mypy.types import (
CallableType,
Instance,
LiteralValue,
Overloaded,
PartialType,
TupleType,
Type,
TypedDictType,
TypeType,
)
from mypy.typevars import fill_typevars
# An object that represents either a precise type or a type with an upper bound;
# it is important for correct type inference with isinstance.
class TypeRange(NamedTuple):
item: Type
is_upper_bound: bool # False => precise type
@trait
class ExpressionCheckerSharedApi:
@abstractmethod
def accept(
self,
node: Expression,
type_context: Type | None = None,
allow_none_return: bool = False,
always_allow_any: bool = False,
is_callee: bool = False,
) -> Type:
raise NotImplementedError
@abstractmethod
def analyze_ref_expr(self, e: RefExpr, lvalue: bool = False) -> Type:
raise NotImplementedError
@abstractmethod
def check_call(
self,
callee: Type,
args: list[Expression],
arg_kinds: list[ArgKind],
context: Context,
arg_names: Sequence[str | None] | None = None,
callable_node: Expression | None = None,
callable_name: str | None = None,
object_type: Type | None = None,
original_type: Type | None = None,
) -> tuple[Type, Type]:
raise NotImplementedError
@abstractmethod
def transform_callee_type(
self,
callable_name: str | None,
callee: Type,
args: list[Expression],
arg_kinds: list[ArgKind],
context: Context,
arg_names: Sequence[str | None] | None = None,
object_type: Type | None = None,
) -> Type:
raise NotImplementedError
@abstractmethod
def method_fullname(self, object_type: Type, method_name: str) -> str | None:
raise NotImplementedError
@abstractmethod
def check_method_call_by_name(
self,
method: str,
base_type: Type,
args: list[Expression],
arg_kinds: list[ArgKind],
context: Context,
original_type: Type | None = None,
) -> tuple[Type, Type]:
raise NotImplementedError
@abstractmethod
def visit_typeddict_index_expr(
self, td_type: TypedDictType, index: Expression, setitem: bool = False
) -> tuple[Type, set[str]]:
raise NotImplementedError
@abstractmethod
def infer_literal_expr_type(self, value: LiteralValue, fallback_name: str) -> Type:
raise NotImplementedError
@abstractmethod
def analyze_static_reference(
self,
node: SymbolNode,
ctx: Context,
is_lvalue: bool,
*,
include_modules: bool = True,
suppress_errors: bool = False,
) -> Type:
raise NotImplementedError
@trait
class TypeCheckerSharedApi(CheckerPluginInterface):
plugin: Plugin
module_refs: set[str]
scope: CheckerScope
checking_missing_await: bool
allow_constructor_cache: bool
@property
@abstractmethod
def expr_checker(self) -> ExpressionCheckerSharedApi:
raise NotImplementedError
@abstractmethod
def named_type(self, name: str) -> Instance:
raise NotImplementedError
@abstractmethod
def lookup_typeinfo(self, fullname: str) -> TypeInfo:
raise NotImplementedError
@abstractmethod
def lookup_type(self, node: Expression) -> Type:
raise NotImplementedError
@abstractmethod
def handle_cannot_determine_type(self, name: str, context: Context) -> None:
raise NotImplementedError
@abstractmethod
def handle_partial_var_type(
self, typ: PartialType, is_lvalue: bool, node: Var, context: Context
) -> Type:
raise NotImplementedError
@overload
@abstractmethod
def check_subtype(
self,
subtype: Type,
supertype: Type,
context: Context,
msg: str,
subtype_label: str | None = None,
supertype_label: str | None = None,
*,
notes: list[str] | None = None,
code: ErrorCode | None = None,
outer_context: Context | None = None,
) -> bool: ...
@overload
@abstractmethod
def check_subtype(
self,
subtype: Type,
supertype: Type,
context: Context,
msg: ErrorMessage,
subtype_label: str | None = None,
supertype_label: str | None = None,
*,
notes: list[str] | None = None,
outer_context: Context | None = None,
) -> bool: ...
# Unfortunately, mypyc doesn't support abstract overloads yet.
@abstractmethod
def check_subtype(
self,
subtype: Type,
supertype: Type,
context: Context,
msg: str | ErrorMessage,
subtype_label: str | None = None,
supertype_label: str | None = None,
*,
notes: list[str] | None = None,
code: ErrorCode | None = None,
outer_context: Context | None = None,
) -> bool:
raise NotImplementedError
@abstractmethod
def get_final_context(self) -> bool:
raise NotImplementedError
@overload
@abstractmethod
def conditional_types_with_intersection(
self,
expr_type: Type,
type_ranges: list[TypeRange] | None,
ctx: Context,
default: None = None,
) -> tuple[Type | None, Type | None]: ...
@overload
@abstractmethod
def conditional_types_with_intersection(
self, expr_type: Type, type_ranges: list[TypeRange] | None, ctx: Context, default: Type
) -> tuple[Type, Type]: ...
# Unfortunately, mypyc doesn't support abstract overloads yet.
@abstractmethod
def conditional_types_with_intersection(
self,
expr_type: Type,
type_ranges: list[TypeRange] | None,
ctx: Context,
default: Type | None = None,
) -> tuple[Type | None, Type | None]:
raise NotImplementedError
@abstractmethod
def narrow_type_by_identity_equality(
self,
operator: str,
operands: list[Expression],
operand_types: list[Type],
expr_indices: list[int],
narrowable_indices: AbstractSet[int],
) -> tuple[dict[Expression, Type] | None, dict[Expression, Type] | None]:
raise NotImplementedError
@abstractmethod
def check_deprecated(self, node: Node | None, context: Context) -> None:
raise NotImplementedError
@abstractmethod
def warn_deprecated(self, node: Node | None, context: Context) -> None:
raise NotImplementedError
@abstractmethod
def type_is_iterable(self, type: Type) -> bool:
raise NotImplementedError
@abstractmethod
def iterable_item_type(
self, it: Instance | CallableType | TypeType | Overloaded, context: Context
) -> Type:
raise NotImplementedError
@abstractmethod
@contextmanager
def checking_await_set(self) -> Iterator[None]:
raise NotImplementedError
@abstractmethod
def get_precise_awaitable_type(self, typ: Type, local_errors: ErrorWatcher) -> Type | None:
raise NotImplementedError
@abstractmethod
def add_any_attribute_to_type(self, typ: Type, name: str) -> Type:
raise NotImplementedError
@abstractmethod
def is_defined_in_stub(self, typ: Instance, /) -> bool:
raise NotImplementedError
class CheckerScope:
# We keep two stacks combined, to maintain the relative order
stack: list[TypeInfo | FuncItem | MypyFile]
def __init__(self, module: MypyFile) -> None:
self.stack = [module]
def current_function(self) -> FuncItem | None:
for e in reversed(self.stack):
if isinstance(e, FuncItem):
return e
return None
def top_level_function(self) -> FuncItem | None:
"""Return top-level non-lambda function."""
for e in self.stack:
if isinstance(e, FuncItem) and not isinstance(e, LambdaExpr):
return e
return None
def active_class(self) -> TypeInfo | None:
if isinstance(self.stack[-1], TypeInfo):
return self.stack[-1]
return None
def enclosing_class(self, func: FuncItem | None = None) -> TypeInfo | None:
"""Is there a class *directly* enclosing this function?"""
func = func or self.current_function()
assert func, "This method must be called from inside a function"
index = self.stack.index(func)
assert index, "CheckerScope stack must always start with a module"
enclosing = self.stack[index - 1]
if isinstance(enclosing, TypeInfo):
return enclosing
return None
def active_self_type(self) -> Instance | TupleType | None:
"""An instance or tuple type representing the current class.
This returns None unless we are in class body or in a method.
In particular, inside a function nested in method this returns None.
"""
info = self.active_class()
if not info and self.current_function():
info = self.enclosing_class()
if info:
return fill_typevars(info)
return None
def current_self_type(self) -> Instance | TupleType | None:
"""Same as active_self_type() but handle functions nested in methods."""
if (item := self.current_class()) is not None:
return fill_typevars(item)
return None
def current_class(self) -> TypeInfo | None:
for item in reversed(self.stack):
if isinstance(item, TypeInfo):
return item
return None
def is_top_level(self) -> bool:
"""Is current scope top-level (no classes or functions)?"""
return len(self.stack) == 1
@contextmanager
def push_function(self, item: FuncItem) -> Iterator[None]:
self.stack.append(item)
yield
self.stack.pop()
@contextmanager
def push_class(self, info: TypeInfo) -> Iterator[None]:
self.stack.append(info)
yield
self.stack.pop()