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_Assign(self, n: ast35.Assign) -> AssignmentStmt:
typ = None
if hasattr(n,
'annotation') and n.annotation is not None: # type: ignore
new_syntax = True
else:
new_syntax = False
if new_syntax and self.pyversion < (3, 6):
raise TypeCommentParseError(
'Variable annotation syntax is only '
'suppoted in Python 3.6, use type '
'comment instead', n.lineno, n.col_offset)
# typed_ast prevents having both type_comment and annotation.
if n.type_comment is not None:
typ = parse_type_comment(n.type_comment, n.lineno)
elif new_syntax:
typ = TypeConverter(line=n.lineno).visit(
n.annotation) # type: ignore
typ.column = n.annotation.col_offset
if n.value is None: # always allow 'x: int'
rvalue = TempNode(AnyType()) # type: Expression
else:
rvalue = self.visit(n.value)
lvalues = self.translate_expr_list(n.targets)
return AssignmentStmt(lvalues, rvalue, type=typ, new_syntax=new_syntax)
def copy_argument(self, argument: Argument) -> Argument:
init_stmt = None # type: AssignmentStmt
if argument.initialization_statement:
init_lvalue = cast(
NameExpr,
self.node(argument.initialization_statement.lvalues[0]),
)
init_lvalue.set_line(argument.line)
init_stmt = AssignmentStmt(
[init_lvalue],
self.node(argument.initialization_statement.rvalue),
self.optional_type(argument.initialization_statement.type),
)
arg = Argument(
self.visit_var(argument.variable),
argument.type_annotation,
argument.initializer,
argument.kind,
init_stmt,
)
# Refresh lines of the inner things
arg.set_line(argument.line)
return arg
def duplicate_assignment(self, node: AssignmentStmt) -> AssignmentStmt:
new = AssignmentStmt(self.expressions(node.lvalues),
self.expr(node.rvalue),
self.optional_type(node.type))
new.line = node.line
new.is_final_def = node.is_final_def
return new
def visit_AnnAssign(self, n: ast3.AnnAssign) -> AssignmentStmt:
if n.value is None: # always allow 'x: int'
rvalue = TempNode(AnyType()) # type: Expression
else:
rvalue = self.visit(n.value)
typ = TypeConverter(self.errors, line=n.lineno).visit(n.annotation)
typ.column = n.annotation.col_offset
return AssignmentStmt([self.visit(n.target)], rvalue, type=typ, new_syntax=True)
def visit_Assign(self, n: ast3.Assign) -> AssignmentStmt:
lvalues = self.translate_expr_list(n.targets)
rvalue = self.visit(n.value)
if n.type_comment is not None:
typ = parse_type_comment(n.type_comment, n.lineno, self.errors)
else:
typ = None
return AssignmentStmt(lvalues, rvalue, type=typ, new_syntax=False)
def visit_Assign(self, n: ast27.Assign) -> AssignmentStmt:
typ = None
if n.type_comment:
typ = parse_type_comment(n.type_comment, n.lineno, self.errors)
return AssignmentStmt(self.translate_expr_list(n.targets),
self.visit(n.value),
type=typ)
def visit_Assign(self, n: ast35.Assign) -> Node:
typ = None
if n.type_comment:
typ = parse_type_comment(n.type_comment, n.lineno)
return AssignmentStmt(self.visit_list(n.targets),
self.visit(n.value),
type=typ)
def visit_Assign(self, n: ast27.Assign) -> AssignmentStmt:
typ = None
if n.type_comment:
typ = parse_type_comment(n.type_comment, n.lineno, self.errors,
assume_str_is_unicode=self.unicode_literals)
stmt = AssignmentStmt(self.translate_expr_list(n.targets),
self.visit(n.value),
type=typ)
return self.set_line(stmt, n)
def convert_arg(index: int, arg: ast27.expr) -> Var:
if isinstance(arg, ast27.Name):
v = arg.id
elif isinstance(arg, ast27.Tuple):
v = '__tuple_arg_{}'.format(index + 1)
rvalue = NameExpr(v)
rvalue.set_line(line)
assignment = AssignmentStmt([self.visit(arg)], rvalue)
assignment.set_line(line)
decompose_stmts.append(assignment)
else:
raise RuntimeError("'{}' is not a valid argument.".format(ast27.dump(arg)))
return Var(v)
def visit_AnnAssign(self, n: ast3.AnnAssign) -> AssignmentStmt:
if n.value is None: # always allow 'x: int'
rvalue = TempNode(AnyType(TypeOfAny.special_form),
no_rhs=True) # type: Expression
else:
rvalue = self.visit(n.value)
typ = TypeConverter(self.errors, line=n.lineno).visit(n.annotation)
assert typ is not None
typ.column = n.annotation.col_offset
s = AssignmentStmt([self.visit(n.target)],
rvalue,
type=typ,
new_syntax=True)
return self.set_line(s, n)
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 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 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_Assign(self, n: ast27.Assign) -> AssignmentStmt:
typ = self.translate_type_comment(n, n.type_comment)
stmt = AssignmentStmt(self.translate_expr_list(n.targets),
self.visit(n.value),
type=typ)
return self.set_line(stmt, n)
def duplicate_assignment(self, node: AssignmentStmt) -> AssignmentStmt:
new = AssignmentStmt(self.nodes(node.lvalues), self.node(node.rvalue),
self.optional_type(node.type))
new.line = node.line
return new
def _scan_declarative_decorator_stmt(
cls: ClassDef,
api: SemanticAnalyzerPluginInterface,
stmt: Decorator,
cls_metadata: util.DeclClassApplied,
) -> None:
"""Extract mapping information from a @declared_attr in a declarative
class.
E.g.::
@reg.mapped
class MyClass:
# ...
@declared_attr
def updated_at(cls) -> Column[DateTime]:
return Column(DateTime)
Will resolve in mypy as::
@reg.mapped
class MyClass:
# ...
updated_at: Mapped[Optional[datetime.datetime]]
"""
for dec in stmt.decorators:
if (
isinstance(dec, (NameExpr, MemberExpr, SymbolNode))
and names._type_id_for_named_node(dec) is names.DECLARED_ATTR
):
break
else:
return
dec_index = cls.defs.body.index(stmt)
left_hand_explicit_type: Optional[ProperType] = None
if isinstance(stmt.func.type, CallableType):
func_type = stmt.func.type.ret_type
if isinstance(func_type, UnboundType):
type_id = names._type_id_for_unbound_type(func_type, cls, api)
else:
# this does not seem to occur unless the type argument is
# incorrect
return
if (
type_id
in {
names.MAPPED,
names.RELATIONSHIP,
names.COMPOSITE_PROPERTY,
names.MAPPER_PROPERTY,
names.SYNONYM_PROPERTY,
names.COLUMN_PROPERTY,
}
and func_type.args
):
left_hand_explicit_type = get_proper_type(func_type.args[0])
elif type_id is names.COLUMN and func_type.args:
typeengine_arg = func_type.args[0]
if isinstance(typeengine_arg, UnboundType):
sym = api.lookup_qualified(typeengine_arg.name, typeengine_arg)
if sym is not None and isinstance(sym.node, TypeInfo):
if names._has_base_type_id(sym.node, names.TYPEENGINE):
left_hand_explicit_type = UnionType(
[
infer._extract_python_type_from_typeengine(
api, sym.node, []
),
NoneType(),
]
)
else:
util.fail(
api,
"Column type should be a TypeEngine "
"subclass not '{}'".format(sym.node.fullname),
func_type,
)
if left_hand_explicit_type is None:
# no type on the decorated function. our option here is to
# dig into the function body and get the return type, but they
# should just have an annotation.
msg = (
"Can't infer type from @declared_attr on function '{}'; "
"please specify a return type from this function that is "
"one of: Mapped[<python type>], relationship[<target class>], "
"Column[<TypeEngine>], MapperProperty[<python type>]"
)
util.fail(api, msg.format(stmt.var.name), stmt)
left_hand_explicit_type = AnyType(TypeOfAny.special_form)
left_node = NameExpr(stmt.var.name)
left_node.node = stmt.var
# totally feeling around in the dark here as I don't totally understand
# the significance of UnboundType. It seems to be something that is
# not going to do what's expected when it is applied as the type of
# an AssignmentStatement. So do a feeling-around-in-the-dark version
# of converting it to the regular Instance/TypeInfo/UnionType structures
# we see everywhere else.
if isinstance(left_hand_explicit_type, UnboundType):
left_hand_explicit_type = get_proper_type(
util._unbound_to_instance(api, left_hand_explicit_type)
)
left_node.node.type = api.named_type(
"__sa_Mapped", [left_hand_explicit_type]
)
# this will ignore the rvalue entirely
# rvalue = TempNode(AnyType(TypeOfAny.special_form))
# rewrite the node as:
# <attr> : Mapped[<typ>] =
# _sa_Mapped._empty_constructor(lambda: <function body>)
# the function body is maintained so it gets type checked internally
column_descriptor = nodes.NameExpr("__sa_Mapped")
column_descriptor.fullname = "sqlalchemy.orm.attributes.Mapped"
mm = nodes.MemberExpr(column_descriptor, "_empty_constructor")
arg = nodes.LambdaExpr(stmt.func.arguments, stmt.func.body)
rvalue = CallExpr(
mm,
[arg],
[nodes.ARG_POS],
["arg1"],
)
new_stmt = AssignmentStmt([left_node], rvalue)
new_stmt.type = left_node.node.type
cls_metadata.mapped_attr_names.append(
(left_node.name, left_hand_explicit_type)
)
cls.defs.body[dec_index] = new_stmt
