def visit_member_expr(self, node: MemberExpr) -> Node:
member = MemberExpr(self.node(node.expr),
node.name)
if node.def_var:
member.def_var = self.visit_var(node.def_var)
self.copy_ref(member, node)
return member
def visit_member_expr(self, node: MemberExpr) -> Node:
member = MemberExpr(self.node(node.expr),
node.name)
if node.def_var:
member.def_var = self.visit_var(node.def_var)
self.copy_ref(member, node)
return member
def visit_member_expr(self, node: MemberExpr) -> MemberExpr:
member = MemberExpr(self.expr(node.expr), node.name)
if node.def_var:
# This refers to an attribute and we don't transform attributes by default,
# just normal variables.
member.def_var = node.def_var
self.copy_ref(member, node)
return member
def visit_member_expr(self, node: MemberExpr) -> MemberExpr:
member = MemberExpr(self.expr(node.expr),
node.name)
if node.def_var:
# This refers to an attribute and we don't transform attributes by default,
# just normal variables.
member.def_var = node.def_var
self.copy_ref(member, node)
return member
def visit_del_stmt(self, s):
if isinstance(s.expr, IndexExpr):
e = s.expr # Cast
m = MemberExpr(e.base, '__delitem__')
m.line = s.line
c = CallExpr(m, [e.index], [nodes.ARG_POS], [None])
c.line = s.line
return c.accept(self)
else:
return None # this case is handled in semantical analysis
def visit_member_expr(self, node: MemberExpr) -> None:
self.strip_ref_expr(node)
if self.is_duplicate_attribute_def(node):
# This is marked as a instance variable definition but a base class
# defines an attribute with the same name, and we can't have
# multiple definitions for an attribute. Defer to the base class
# definition.
del self.type.names[node.name]
node.is_def = False
node.def_var = None
def visit_JoinedStr(self, n: ast3.JoinedStr) -> Expression:
arg_count = len(n.values)
format_string = StrExpr('{}' * arg_count)
format_string.set_line(n.lineno, n.col_offset)
format_method = MemberExpr(format_string, 'format')
format_method.set_line(format_string)
format_args = self.translate_expr_list(n.values)
format_arg_kinds = [ARG_POS] * arg_count
result_expression = CallExpr(format_method, format_args,
format_arg_kinds)
return result_expression
def visit_JoinedStr(self, n: ast3.JoinedStr) -> Expression:
result_expression = StrExpr('') # type: Expression
for value_expr in self.translate_expr_list(n.values):
string_method = MemberExpr(value_expr, '__str__')
string_method.set_line(value_expr)
stringified_value_expr = CallExpr(string_method, [], [])
stringified_value_expr.set_line(value_expr)
result_expression = OpExpr('+', result_expression,
stringified_value_expr)
result_expression.set_line(value_expr)
return result_expression
def visit_member_expr(self, node: MemberExpr) -> None:
self.strip_ref_expr(node)
if self.is_duplicate_attribute_def(node):
# This is marked as an instance variable definition but a base class
# defines an attribute with the same name, and we can't have
# multiple definitions for an attribute. Defer to the base class
# definition.
if self.type is not None:
del self.type.names[node.name]
node.is_inferred_def = False
node.def_var = None
super().visit_member_expr(node)
def visit_FormattedValue(self, n: ast3.FormattedValue) -> Expression:
# A FormattedValue is a component of a JoinedStr, or it can exist
# on its own. We translate them to individual '{}'.format(value)
# calls -- we don't bother with the conversion/format_spec fields.
exp = self.visit(n.value)
exp.set_line(n.lineno, n.col_offset)
format_string = StrExpr('{}')
format_string.set_line(n.lineno, n.col_offset)
format_method = MemberExpr(format_string, 'format')
format_method.set_line(format_string)
result_expression = CallExpr(format_method, [exp], [ARG_POS])
return result_expression
def visit_JoinedStr(self, n: ast3.JoinedStr) -> Expression:
# Each of n.values is a str or FormattedValue; we just concatenate
# them all using ''.join.
empty_string = StrExpr('')
empty_string.set_line(n.lineno, n.col_offset)
strs_to_join = ListExpr(self.translate_expr_list(n.values))
strs_to_join.set_line(empty_string)
join_method = MemberExpr(empty_string, 'join')
join_method.set_line(empty_string)
result_expression = CallExpr(join_method, [strs_to_join],
[ARG_POS], [None])
return result_expression
def visit_JoinedStr(self, n: ast3.JoinedStr) -> Expression:
# Each of n.values is a str or FormattedValue; we just concatenate
# them all using ''.join.
empty_string = StrExpr('')
empty_string.set_line(n.lineno, n.col_offset)
strs_to_join = ListExpr(self.translate_expr_list(n.values))
strs_to_join.set_line(empty_string)
join_method = MemberExpr(empty_string, 'join')
join_method.set_line(empty_string)
result_expression = CallExpr(join_method,
[strs_to_join],
[ARG_POS],
[None])
return result_expression
def visit_member_expr(self, node: MemberExpr) -> None:
self.strip_ref_expr(node)
# These need to cleared for member expressions but not for other RefExprs since
# these can change based on changed in a base class.
node.is_new_def = False
node.is_inferred_def = False
if self.is_duplicate_attribute_def(node):
# This is marked as an instance variable definition but a base class
# defines an attribute with the same name, and we can't have
# multiple definitions for an attribute. Defer to the base class
# definition.
self.strip_class_attr(node.name)
node.def_var = None
super().visit_member_expr(node)
def visit_FormattedValue(self, n: ast3.FormattedValue) -> Expression:
# A FormattedValue is a component of a JoinedStr, or it can exist
# on its own. We translate them to individual '{}'.format(value)
# calls -- we don't bother with the conversion/format_spec fields.
exp = self.visit(n.value)
exp.set_line(n.lineno, n.col_offset)
format_string = StrExpr('{}')
format_string.set_line(n.lineno, n.col_offset)
format_method = MemberExpr(format_string, 'format')
format_method.set_line(format_string)
result_expression = CallExpr(format_method,
[exp],
[ARG_POS],
[None])
return result_expression
def visit_Attribute(self, n):
if (isinstance(n.value, typed_ast.Call)
and isinstance(n.value.func, typed_ast.Name)
and n.value.func.id == 'super'):
return SuperExpr(n.attr)
return MemberExpr(self.visit(n.value), n.attr)
def make_setter_wrapper(self, name: str, typ: Type) -> FuncDef:
"""Create a setter wrapper for a data attribute.
The setter will be of this form:
. def set$name(self: C, name: typ) -> None:
. self.name! = name
"""
scope = self.make_scope()
selft = self.self_type()
selfv = scope.add('self', selft)
namev = scope.add(name, typ)
lvalue = MemberExpr(scope.name_expr('self'), name, direct=True)
rvalue = scope.name_expr(name)
ret = AssignmentStmt([lvalue], rvalue)
wrapper_name = 'set$' + name
sig = Callable([selft, typ],
[nodes.ARG_POS, nodes.ARG_POS],
[None, None],
Void(), False)
fdef = FuncDef(wrapper_name,
[selfv, namev],
[nodes.ARG_POS, nodes.ARG_POS],
[None, None],
Block([ret]), sig)
fdef.info = self.tf.type_context()
return fdef
def visit_member_expr(self, node: MemberExpr) -> None:
self.strip_ref_expr(node)
# These need to cleared for member expressions but not for other RefExprs since
# these can change based on changed in a base class.
node.is_new_def = False
node.is_inferred_def = False
if self.is_duplicate_attribute_def(node):
# This is marked as an instance variable definition but a base class
# defines an attribute with the same name, and we can't have
# multiple definitions for an attribute. Defer to the base class
# definition.
self.strip_class_attr(node.name)
node.def_var = None
if isinstance(node.node, Var):
self._reset_var_final_flags(node.node)
super().visit_member_expr(node)
def visit_Attribute(self, n: ast35.Attribute) -> Node:
if (isinstance(n.value, ast35.Call) and
isinstance(n.value.func, ast35.Name) and
n.value.func.id == 'super'):
return SuperExpr(n.attr)
return MemberExpr(self.visit(n.value), n.attr)
def visit_Attribute(self, n: ast27.Attribute) -> Expression:
if (isinstance(n.value, ast27.Call) and
isinstance(n.value.func, ast27.Name) and
n.value.func.id == 'super'):
return SuperExpr(n.attr, self.visit(n.value))
return MemberExpr(self.visit(n.value), n.attr)
def expr_to_mapped_constructor(expr: Expression) -> CallExpr:
column_descriptor = NameExpr("__sa_Mapped")
column_descriptor.fullname = "sqlalchemy.orm.attributes.Mapped"
member_expr = MemberExpr(column_descriptor, "_empty_constructor")
return CallExpr(
member_expr,
[expr],
[ARG_POS],
["arg1"],
)
def expr_to_mapped_constructor(expr: Expression) -> CallExpr:
column_descriptor = NameExpr("__sa_Mapped")
column_descriptor.fullname = NAMED_TYPE_SQLA_MAPPED
member_expr = MemberExpr(column_descriptor, "_empty_constructor")
return CallExpr(
member_expr,
[expr],
[ARG_POS],
["arg1"],
)
def call_wrapper(self, fdef: FuncDef, is_dynamic: bool,
is_wrapper_class: bool, target_ann: Callable,
cur_ann: Callable, target_suffix: str,
bound_sig: Callable) -> Node:
"""Return the body of wrapper method.
The body contains only a call to the wrapped method and a
return statement (if the call returns a value). Arguments are coerced
to the target signature.
"""
args = self.call_args(fdef.args,
target_ann,
cur_ann,
is_dynamic,
is_wrapper_class,
bound_sig,
ismethod=fdef.is_method())
selfarg = args[0]
args = args[1:]
member = fdef.name() + target_suffix
if not is_wrapper_class:
callee = MemberExpr(selfarg, member)
else:
callee = MemberExpr(
MemberExpr(self_expr(), self.tf.object_member_name()), member)
call = CallExpr(callee, args, [nodes.ARG_POS] * len(args),
[None] * len(args)) # type: Node
if bound_sig:
call = self.tf.coerce(call,
bound_sig.ret_type, target_ann.ret_type,
self.tf.type_context(), is_wrapper_class)
call = self.tf.coerce(call, cur_ann.ret_type, bound_sig.ret_type,
self.tf.type_context(), is_wrapper_class)
else:
call = self.tf.coerce(call, cur_ann.ret_type, target_ann.ret_type,
self.tf.type_context(), is_wrapper_class)
if not isinstance(target_ann.ret_type, Void):
return ReturnStmt(call)
else:
return ExpressionStmt(call)
def visit_Attribute(self, n: Attribute) -> Union[MemberExpr, SuperExpr]:
value = n.value
member_expr = MemberExpr(self.visit(value), n.attr)
obj = member_expr.expr
if (isinstance(obj, CallExpr) and isinstance(obj.callee, NameExpr)
and obj.callee.name == 'super'):
e = SuperExpr(member_expr.name,
obj) # type: Union[MemberExpr, SuperExpr]
else:
e = member_expr
return self.set_line(e, n)
def get_tvar_access_expression(typ: TypeInfo, tvindex: int, alt: Any,
is_java: Any) -> RuntimeTypeVar:
"""Return a type expression that maps from runtime type variable slots
to the type variable in the given class with the given index.
For example, assuming class A(Generic[T, S]): ... and
class B(A[X, Y[U]], Generic[U]): ...:
get_tvar_access_expression(<B>, 1) ==
RuntimeTypeVar(<self.__tv2.args[0]>) (with <...> represented as nodes)
"""
# First get the description of how to get from supertype type variables to
# a subtype type variable.
mapping = get_tvar_access_path(typ, tvindex)
# The type checker should have noticed if there is no mapping. Be defensive
# and make sure there is one.
if mapping is None:
raise RuntimeError('Could not find a typevar mapping')
# Build the expression for getting at the subtype type variable
# progressively.
# First read the value of a supertype runtime type variable slot.
s = self_expr() # type: Node
if alt == OBJECT_VAR:
o = '__o'
if is_java:
o = '__o_{}'.format(typ.name)
s = MemberExpr(s, o)
expr = MemberExpr(s, tvar_slot_name(mapping[0] - 1, alt)) # type: Node
# Then, optionally look into arguments based on the description.
for i in mapping[1:]:
expr = MemberExpr(expr, 'args')
expr = IndexExpr(expr, IntExpr(i - 1))
# Than add a final wrapper so that we have a valid type.
return RuntimeTypeVar(expr)
def visit_Attribute(self, n: Attribute) -> Expression:
# First create MemberExpr and then potentially replace with a SuperExpr
# to improve performance when compiled. The check for "super()" will be
# faster with native AST nodes. Note also that super expressions are
# less common than normal member expressions.
member_expr = MemberExpr(self.visit(n.value), n.attr)
obj = member_expr.expr
if (isinstance(obj, CallExpr) and isinstance(obj.callee, NameExpr)
and obj.callee.name == 'super'):
e: Expression = SuperExpr(member_expr.name, obj)
else:
e = member_expr
return self.set_line(e, n)
def _add_attr_access_to_module(module: MypyFile, class_info: TypeInfo,
attr_name: str) -> None:
"""
Adds a statement that accesses a given `attr_name` of a type (specified via `class_info`) as the last
statement in a `module`.
"""
module.defs.append(
ExpressionStmt(
MemberExpr(
CastExpr(NameExpr('None'), Instance(class_info, [])),
attr_name,
)))
def make_instance_tvar_initializer(self, creat: FuncDef) -> None:
"""Add type variable member initialization code to a constructor.
Modify the constructor body directly.
"""
for n in range(num_slots(creat.info)):
rvalue = self.make_tvar_init_expression(creat.info, n)
init = AssignmentStmt([MemberExpr(self_expr(),
tvar_slot_name(n),
direct=True)],
rvalue)
self.tf.set_type(init.lvalues[0], AnyType())
self.tf.set_type(init.rvalue, AnyType())
creat.body.body.insert(n, init)
def make_generic_wrapper_init(self, info: TypeInfo) -> FuncDef:
"""Build constructor of a generic wrapper class."""
nslots = num_slots(info)
cdefs = [] # type: List[Node]
# Build superclass constructor call.
base = info.mro[1]
if base.fullname() != 'builtins.object' and self.tf.is_java:
s = SuperExpr('__init__')
cargs = [NameExpr('__o')] # type: List[Node]
for n in range(num_slots(base)):
cargs.append(NameExpr(tvar_arg_name(n + 1)))
for n in range(num_slots(base)):
cargs.append(NameExpr(tvar_arg_name(n + 1, BOUND_VAR)))
c = CallExpr(s, cargs, [nodes.ARG_POS] * len(cargs))
cdefs.append(ExpressionStmt(c))
# Create initialization of the wrapped object.
cdefs.append(AssignmentStmt([MemberExpr(
self_expr(),
self.object_member_name(info),
direct=True)],
NameExpr('__o')))
# Build constructor arguments.
args = [Var('self'), Var('__o')]
init = [None, None] # type: List[Node]
for alt in [False, BOUND_VAR]:
for n in range(nslots):
args.append(Var(tvar_arg_name(n + 1, alt)))
init.append(None)
nargs = nslots * 2 + 2
fdef = FuncDef('__init__',
args,
[nodes.ARG_POS] * nargs,
init,
Block(cdefs),
Callable( [AnyType()] * nargs,
[nodes.ARG_POS] * nargs, [None] * nargs,
Void(),
is_type_obj=False))
fdef.info = info
self.make_wrapper_slot_initializer(fdef)
return fdef
def visit_member_expr(self, e: MemberExpr) -> None:
super().visit_member_expr(e)
typ = self.get_type(e.expr)
if self.dynamic_funcs[-1]:
e.expr = self.coerce_to_dynamic(e.expr, typ, self.type_context())
typ = AnyType()
if isinstance(typ, Instance):
# Reference to a statically-typed method variant with the suffix
# derived from the base object type.
suffix = self.get_member_reference_suffix(e.name, typ.type)
else:
# Reference to a dynamically-typed method variant.
suffix = self.dynamic_suffix()
e.name += suffix
def make_wrapper_slot_initializer(self, creat: FuncDef) -> None:
"""Add type variable member initializations to a wrapper constructor.
The function must be a constructor of a generic wrapper class. Modify
the constructor body directly.
"""
for alt in [BOUND_VAR, False]:
for n in range(num_slots(creat.info)):
rvalue = TypeExpr(
RuntimeTypeVar(NameExpr(tvar_slot_name(n, alt))))
init = AssignmentStmt(
[MemberExpr(self_expr(),
tvar_slot_name(n, alt), direct=True)],
rvalue)
self.tf.set_type(init.lvalues[0], AnyType())
self.tf.set_type(init.rvalue, AnyType())
creat.body.body.insert(n, init)
def visit_member_expr(self, e: MemberExpr) -> None:
super().visit_member_expr(e)
typ = self.get_type(e.expr)
if self.dynamic_funcs[-1]:
e.expr = self.coerce_to_dynamic(e.expr, typ, self.type_context())
typ = AnyType()
if isinstance(typ, Instance):
# Reference to a statically-typed method variant with the suffix
# derived from the base object type.
suffix = self.get_member_reference_suffix(e.name, typ.type)
else:
# Reference to a dynamically-typed method variant.
suffix = self.dynamic_suffix()
e.name += suffix
def _check_str_format_call(
log_msg_expr: t.Union[StrExpr, NameExpr],
ctx: MethodContext,
) -> None:
""" Taps into mypy to typecheck something like this:
```py
logger.debug('The bar is "{my_foo.bar}"', my_foo=foo)
```
as if it was written like this:
```py
logger.debug('The bar is "{my_foo.bar}"'.format(my_foo=foo))
```
"""
call_expr = CallExpr(
callee=MemberExpr(expr=log_msg_expr, name='format'),
args=ctx.args[1] + ctx.args[2],
arg_kinds=ctx.arg_kinds[1] + ctx.arg_kinds[2],
arg_names=ctx.arg_names[1] + ctx.arg_names[2],
)
call_expr.set_line(log_msg_expr)
# WARNING: `ctx.api` *is* technically a `mypy.checker.TypeChecker` so the cast is
# safe to make, however, mypy says this should be an implementation detail.
# So, anything that's not part of the `CheckerPluginInterface` should be expected to
# change. See https://github.com/python/mypy/issues/6617
try:
type_checker = t.cast(TypeChecker, ctx.api)
type_checker.expr_checker.visit_call_expr(call_expr)
except AttributeError:
ctx.api.msg.fail(
("AttributeError when trying to access mypy's functionality. "
'This could mean you are trying to use incompatible versions '
'of mypy and loguru-mypy.'),
context=log_msg_expr,
)
def make_getter_wrapper(self, name: str, typ: Type) -> FuncDef:
"""Create a getter wrapper for a data attribute.
The getter will be of this form:
. def $name*(self: C) -> type:
. return self.name!
"""
scope = self.make_scope()
selft = self.self_type()
selfv = scope.add('self', selft)
member_expr = MemberExpr(scope.name_expr('self'), name, direct=True)
ret = ReturnStmt(member_expr)
wrapper_name = '$' + name
sig = Callable([selft], [nodes.ARG_POS], [None], typ, False)
fdef = FuncDef(wrapper_name,
[selfv],
[nodes.ARG_POS],
[None],
Block([ret]), sig)
fdef.info = self.tf.type_context()
return fdef
def make_dynamic_getter_wrapper(self, name: str, typ: Type) -> FuncDef:
"""Create a dynamically-typed getter wrapper for a data attribute.
The getter will be of this form:
. def $name*(self: C) -> Any:
. return {Any <= typ self.name!}
"""
scope = self.make_scope()
selft = self.self_type()
selfv = scope.add('self', selft)
member_expr = MemberExpr(scope.name_expr('self'), name, direct=True)
coerce_expr = coerce(member_expr, AnyType(), typ,
self.tf.type_context())
ret = ReturnStmt(coerce_expr)
wrapper_name = '$' + name + self.tf.dynamic_suffix()
sig = Callable([selft], [nodes.ARG_POS], [None], AnyType(), False)
return FuncDef(wrapper_name,
[selfv],
[nodes.ARG_POS],
[None],
Block([ret]), sig)
def make_dynamic_setter_wrapper(self, name: str, typ: Type) -> FuncDef:
"""Create a dynamically-typed setter wrapper for a data attribute.
The setter will be of this form:
. def set$name*(self: C, name; Any) -> None:
. self.name! = {typ name}
"""
lvalue = MemberExpr(self_expr(), name, direct=True)
name_expr = NameExpr(name)
rvalue = coerce(name_expr, typ, AnyType(), self.tf.type_context())
ret = AssignmentStmt([lvalue], rvalue)
wrapper_name = 'set$' + name + self.tf.dynamic_suffix()
selft = self_type(self.tf.type_context())
sig = Callable([selft, AnyType()],
[nodes.ARG_POS, nodes.ARG_POS],
[None, None],
Void(), False)
return FuncDef(wrapper_name,
[Var('self'), Var(name)],
[nodes.ARG_POS, nodes.ARG_POS],
[None, None],
Block([ret]), sig)
def visit_member_expr(self, node: MemberExpr) -> None:
if node.def_var:
node.def_var = self.fixup(node.def_var)
self.visit_ref_expr(node)
super().visit_member_expr(node)
def visit_member_expr(self, node: MemberExpr) -> None:
if node.def_var:
node.def_var = self.fixup(node.def_var)
self.visit_ref_expr(node)
super().visit_member_expr(node)