564 lines
26 KiB
Python
564 lines
26 KiB
Python
|
"""Semantic analysis of named tuple definitions.
|
||
|
|
||
|
This is conceptually part of mypy.semanal.
|
||
|
"""
|
||
|
|
||
|
from contextlib import contextmanager
|
||
|
from typing import Tuple, List, Dict, Mapping, Optional, Union, cast, Iterator
|
||
|
from typing_extensions import Final
|
||
|
|
||
|
from mypy.types import (
|
||
|
Type, TupleType, AnyType, TypeOfAny, CallableType, TypeType, TypeVarType,
|
||
|
UnboundType, LiteralType,
|
||
|
)
|
||
|
from mypy.semanal_shared import (
|
||
|
SemanticAnalyzerInterface, set_callable_name, calculate_tuple_fallback, PRIORITY_FALLBACKS
|
||
|
)
|
||
|
from mypy.nodes import (
|
||
|
Var, EllipsisExpr, Argument, StrExpr, BytesExpr, UnicodeExpr, ExpressionStmt, NameExpr,
|
||
|
AssignmentStmt, PassStmt, Decorator, FuncBase, ClassDef, Expression, RefExpr, TypeInfo,
|
||
|
NamedTupleExpr, CallExpr, Context, TupleExpr, ListExpr, SymbolTableNode, FuncDef, Block,
|
||
|
TempNode, SymbolTable, TypeVarExpr, ARG_POS, ARG_NAMED_OPT, ARG_OPT, MDEF
|
||
|
)
|
||
|
from mypy.options import Options
|
||
|
from mypy.exprtotype import expr_to_unanalyzed_type, TypeTranslationError
|
||
|
from mypy.util import get_unique_redefinition_name
|
||
|
|
||
|
# Matches "_prohibited" in typing.py, but adds __annotations__, which works at runtime but can't
|
||
|
# easily be supported in a static checker.
|
||
|
NAMEDTUPLE_PROHIBITED_NAMES: Final = (
|
||
|
"__new__",
|
||
|
"__init__",
|
||
|
"__slots__",
|
||
|
"__getnewargs__",
|
||
|
"_fields",
|
||
|
"_field_defaults",
|
||
|
"_field_types",
|
||
|
"_make",
|
||
|
"_replace",
|
||
|
"_asdict",
|
||
|
"_source",
|
||
|
"__annotations__",
|
||
|
)
|
||
|
|
||
|
NAMEDTUP_CLASS_ERROR: Final = (
|
||
|
"Invalid statement in NamedTuple definition; " 'expected "field_name: field_type [= default]"'
|
||
|
)
|
||
|
|
||
|
SELF_TVAR_NAME: Final = "_NT"
|
||
|
|
||
|
|
||
|
class NamedTupleAnalyzer:
|
||
|
def __init__(self, options: Options, api: SemanticAnalyzerInterface) -> None:
|
||
|
self.options = options
|
||
|
self.api = api
|
||
|
|
||
|
def analyze_namedtuple_classdef(self, defn: ClassDef, is_stub_file: bool,
|
||
|
is_func_scope: bool
|
||
|
) -> Tuple[bool, Optional[TypeInfo]]:
|
||
|
"""Analyze if given class definition can be a named tuple definition.
|
||
|
|
||
|
Return a tuple where first item indicates whether this can possibly be a named tuple,
|
||
|
and the second item is the corresponding TypeInfo (may be None if not ready and should be
|
||
|
deferred).
|
||
|
"""
|
||
|
for base_expr in defn.base_type_exprs:
|
||
|
if isinstance(base_expr, RefExpr):
|
||
|
self.api.accept(base_expr)
|
||
|
if base_expr.fullname == 'typing.NamedTuple':
|
||
|
result = self.check_namedtuple_classdef(defn, is_stub_file)
|
||
|
if result is None:
|
||
|
# This is a valid named tuple, but some types are incomplete.
|
||
|
return True, None
|
||
|
items, types, default_items = result
|
||
|
if is_func_scope and '@' not in defn.name:
|
||
|
defn.name += '@' + str(defn.line)
|
||
|
info = self.build_namedtuple_typeinfo(
|
||
|
defn.name, items, types, default_items, defn.line)
|
||
|
defn.info = info
|
||
|
defn.analyzed = NamedTupleExpr(info, is_typed=True)
|
||
|
defn.analyzed.line = defn.line
|
||
|
defn.analyzed.column = defn.column
|
||
|
# All done: this is a valid named tuple with all types known.
|
||
|
return True, info
|
||
|
# This can't be a valid named tuple.
|
||
|
return False, None
|
||
|
|
||
|
def check_namedtuple_classdef(self, defn: ClassDef, is_stub_file: bool
|
||
|
) -> Optional[Tuple[List[str],
|
||
|
List[Type],
|
||
|
Dict[str, Expression]]]:
|
||
|
"""Parse and validate fields in named tuple class definition.
|
||
|
|
||
|
Return a three tuple:
|
||
|
* field names
|
||
|
* field types
|
||
|
* field default values
|
||
|
or None, if any of the types are not ready.
|
||
|
"""
|
||
|
if self.options.python_version < (3, 6) and not is_stub_file:
|
||
|
self.fail('NamedTuple class syntax is only supported in Python 3.6', defn)
|
||
|
return [], [], {}
|
||
|
if len(defn.base_type_exprs) > 1:
|
||
|
self.fail('NamedTuple should be a single base', defn)
|
||
|
items: List[str] = []
|
||
|
types: List[Type] = []
|
||
|
default_items: Dict[str, Expression] = {}
|
||
|
for stmt in defn.defs.body:
|
||
|
if not isinstance(stmt, AssignmentStmt):
|
||
|
# Still allow pass or ... (for empty namedtuples).
|
||
|
if (isinstance(stmt, PassStmt) or
|
||
|
(isinstance(stmt, ExpressionStmt) and
|
||
|
isinstance(stmt.expr, EllipsisExpr))):
|
||
|
continue
|
||
|
# Also allow methods, including decorated ones.
|
||
|
if isinstance(stmt, (Decorator, FuncBase)):
|
||
|
continue
|
||
|
# And docstrings.
|
||
|
if (isinstance(stmt, ExpressionStmt) and
|
||
|
isinstance(stmt.expr, StrExpr)):
|
||
|
continue
|
||
|
self.fail(NAMEDTUP_CLASS_ERROR, stmt)
|
||
|
elif len(stmt.lvalues) > 1 or not isinstance(stmt.lvalues[0], NameExpr):
|
||
|
# An assignment, but an invalid one.
|
||
|
self.fail(NAMEDTUP_CLASS_ERROR, stmt)
|
||
|
else:
|
||
|
# Append name and type in this case...
|
||
|
name = stmt.lvalues[0].name
|
||
|
items.append(name)
|
||
|
if stmt.type is None:
|
||
|
types.append(AnyType(TypeOfAny.unannotated))
|
||
|
else:
|
||
|
analyzed = self.api.anal_type(stmt.type)
|
||
|
if analyzed is None:
|
||
|
# Something is incomplete. We need to defer this named tuple.
|
||
|
return None
|
||
|
types.append(analyzed)
|
||
|
# ...despite possible minor failures that allow further analyzis.
|
||
|
if name.startswith('_'):
|
||
|
self.fail('NamedTuple field name cannot start with an underscore: {}'
|
||
|
.format(name), stmt)
|
||
|
if stmt.type is None or hasattr(stmt, 'new_syntax') and not stmt.new_syntax:
|
||
|
self.fail(NAMEDTUP_CLASS_ERROR, stmt)
|
||
|
elif isinstance(stmt.rvalue, TempNode):
|
||
|
# x: int assigns rvalue to TempNode(AnyType())
|
||
|
if default_items:
|
||
|
self.fail('Non-default NamedTuple fields cannot follow default fields',
|
||
|
stmt)
|
||
|
else:
|
||
|
default_items[name] = stmt.rvalue
|
||
|
return items, types, default_items
|
||
|
|
||
|
def check_namedtuple(self,
|
||
|
node: Expression,
|
||
|
var_name: Optional[str],
|
||
|
is_func_scope: bool) -> Tuple[Optional[str], Optional[TypeInfo]]:
|
||
|
"""Check if a call defines a namedtuple.
|
||
|
|
||
|
The optional var_name argument is the name of the variable to
|
||
|
which this is assigned, if any.
|
||
|
|
||
|
Return a tuple of two items:
|
||
|
* Internal name of the named tuple (e.g. the name passed as an argument to namedtuple)
|
||
|
or None if it is not a valid named tuple
|
||
|
* Corresponding TypeInfo, or None if not ready.
|
||
|
|
||
|
If the definition is invalid but looks like a namedtuple,
|
||
|
report errors but return (some) TypeInfo.
|
||
|
"""
|
||
|
if not isinstance(node, CallExpr):
|
||
|
return None, None
|
||
|
call = node
|
||
|
callee = call.callee
|
||
|
if not isinstance(callee, RefExpr):
|
||
|
return None, None
|
||
|
fullname = callee.fullname
|
||
|
if fullname == 'collections.namedtuple':
|
||
|
is_typed = False
|
||
|
elif fullname == 'typing.NamedTuple':
|
||
|
is_typed = True
|
||
|
else:
|
||
|
return None, None
|
||
|
result = self.parse_namedtuple_args(call, fullname)
|
||
|
if result:
|
||
|
items, types, defaults, typename, ok = result
|
||
|
else:
|
||
|
# Error. Construct dummy return value.
|
||
|
if var_name:
|
||
|
name = var_name
|
||
|
if is_func_scope:
|
||
|
name += '@' + str(call.line)
|
||
|
else:
|
||
|
name = var_name = 'namedtuple@' + str(call.line)
|
||
|
info = self.build_namedtuple_typeinfo(name, [], [], {}, node.line)
|
||
|
self.store_namedtuple_info(info, var_name, call, is_typed)
|
||
|
if name != var_name or is_func_scope:
|
||
|
# NOTE: we skip local namespaces since they are not serialized.
|
||
|
self.api.add_symbol_skip_local(name, info)
|
||
|
return var_name, info
|
||
|
if not ok:
|
||
|
# This is a valid named tuple but some types are not ready.
|
||
|
return typename, None
|
||
|
|
||
|
# We use the variable name as the class name if it exists. If
|
||
|
# it doesn't, we use the name passed as an argument. We prefer
|
||
|
# the variable name because it should be unique inside a
|
||
|
# module, and so we don't need to disambiguate it with a line
|
||
|
# number.
|
||
|
if var_name:
|
||
|
name = var_name
|
||
|
else:
|
||
|
name = typename
|
||
|
|
||
|
if var_name is None or is_func_scope:
|
||
|
# There are two special cases where need to give it a unique name derived
|
||
|
# from the line number:
|
||
|
# * This is a base class expression, since it often matches the class name:
|
||
|
# class NT(NamedTuple('NT', [...])):
|
||
|
# ...
|
||
|
# * This is a local (function or method level) named tuple, since
|
||
|
# two methods of a class can define a named tuple with the same name,
|
||
|
# and they will be stored in the same namespace (see below).
|
||
|
name += '@' + str(call.line)
|
||
|
if len(defaults) > 0:
|
||
|
default_items = {
|
||
|
arg_name: default
|
||
|
for arg_name, default in zip(items[-len(defaults):], defaults)
|
||
|
}
|
||
|
else:
|
||
|
default_items = {}
|
||
|
info = self.build_namedtuple_typeinfo(name, items, types, default_items, node.line)
|
||
|
# If var_name is not None (i.e. this is not a base class expression), we always
|
||
|
# store the generated TypeInfo under var_name in the current scope, so that
|
||
|
# other definitions can use it.
|
||
|
if var_name:
|
||
|
self.store_namedtuple_info(info, var_name, call, is_typed)
|
||
|
# There are three cases where we need to store the generated TypeInfo
|
||
|
# second time (for the purpose of serialization):
|
||
|
# * If there is a name mismatch like One = NamedTuple('Other', [...])
|
||
|
# we also store the info under name 'Other@lineno', this is needed
|
||
|
# because classes are (de)serialized using their actual fullname, not
|
||
|
# the name of l.h.s.
|
||
|
# * If this is a method level named tuple. It can leak from the method
|
||
|
# via assignment to self attribute and therefore needs to be serialized
|
||
|
# (local namespaces are not serialized).
|
||
|
# * If it is a base class expression. It was not stored above, since
|
||
|
# there is no var_name (but it still needs to be serialized
|
||
|
# since it is in MRO of some class).
|
||
|
if name != var_name or is_func_scope:
|
||
|
# NOTE: we skip local namespaces since they are not serialized.
|
||
|
self.api.add_symbol_skip_local(name, info)
|
||
|
return typename, info
|
||
|
|
||
|
def store_namedtuple_info(self, info: TypeInfo, name: str,
|
||
|
call: CallExpr, is_typed: bool) -> None:
|
||
|
self.api.add_symbol(name, info, call)
|
||
|
call.analyzed = NamedTupleExpr(info, is_typed=is_typed)
|
||
|
call.analyzed.set_line(call.line, call.column)
|
||
|
|
||
|
def parse_namedtuple_args(self, call: CallExpr, fullname: str
|
||
|
) -> Optional[Tuple[List[str], List[Type], List[Expression],
|
||
|
str, bool]]:
|
||
|
"""Parse a namedtuple() call into data needed to construct a type.
|
||
|
|
||
|
Returns a 5-tuple:
|
||
|
- List of argument names
|
||
|
- List of argument types
|
||
|
- List of default values
|
||
|
- First argument of namedtuple
|
||
|
- Whether all types are ready.
|
||
|
|
||
|
Return None if the definition didn't typecheck.
|
||
|
"""
|
||
|
type_name = 'NamedTuple' if fullname == 'typing.NamedTuple' else 'namedtuple'
|
||
|
# TODO: Share code with check_argument_count in checkexpr.py?
|
||
|
args = call.args
|
||
|
if len(args) < 2:
|
||
|
self.fail(f'Too few arguments for "{type_name}()"', call)
|
||
|
return None
|
||
|
defaults: List[Expression] = []
|
||
|
if len(args) > 2:
|
||
|
# Typed namedtuple doesn't support additional arguments.
|
||
|
if fullname == 'typing.NamedTuple':
|
||
|
self.fail('Too many arguments for "NamedTuple()"', call)
|
||
|
return None
|
||
|
for i, arg_name in enumerate(call.arg_names[2:], 2):
|
||
|
if arg_name == 'defaults':
|
||
|
arg = args[i]
|
||
|
# We don't care what the values are, as long as the argument is an iterable
|
||
|
# and we can count how many defaults there are.
|
||
|
if isinstance(arg, (ListExpr, TupleExpr)):
|
||
|
defaults = list(arg.items)
|
||
|
else:
|
||
|
self.fail(
|
||
|
"List or tuple literal expected as the defaults argument to "
|
||
|
"{}()".format(type_name),
|
||
|
arg
|
||
|
)
|
||
|
break
|
||
|
if call.arg_kinds[:2] != [ARG_POS, ARG_POS]:
|
||
|
self.fail(f'Unexpected arguments to "{type_name}()"', call)
|
||
|
return None
|
||
|
if not isinstance(args[0], (StrExpr, BytesExpr, UnicodeExpr)):
|
||
|
self.fail(
|
||
|
f'"{type_name}()" expects a string literal as the first argument', call)
|
||
|
return None
|
||
|
typename = cast(Union[StrExpr, BytesExpr, UnicodeExpr], call.args[0]).value
|
||
|
types: List[Type] = []
|
||
|
if not isinstance(args[1], (ListExpr, TupleExpr)):
|
||
|
if (fullname == 'collections.namedtuple'
|
||
|
and isinstance(args[1], (StrExpr, BytesExpr, UnicodeExpr))):
|
||
|
str_expr = args[1]
|
||
|
items = str_expr.value.replace(',', ' ').split()
|
||
|
else:
|
||
|
self.fail(
|
||
|
'List or tuple literal expected as the second argument to "{}()"'.format(
|
||
|
type_name,
|
||
|
),
|
||
|
call,
|
||
|
)
|
||
|
return None
|
||
|
else:
|
||
|
listexpr = args[1]
|
||
|
if fullname == 'collections.namedtuple':
|
||
|
# The fields argument contains just names, with implicit Any types.
|
||
|
if any(not isinstance(item, (StrExpr, BytesExpr, UnicodeExpr))
|
||
|
for item in listexpr.items):
|
||
|
self.fail('String literal expected as "namedtuple()" item', call)
|
||
|
return None
|
||
|
items = [cast(Union[StrExpr, BytesExpr, UnicodeExpr], item).value
|
||
|
for item in listexpr.items]
|
||
|
else:
|
||
|
# The fields argument contains (name, type) tuples.
|
||
|
result = self.parse_namedtuple_fields_with_types(listexpr.items, call)
|
||
|
if result is None:
|
||
|
# One of the types is not ready, defer.
|
||
|
return None
|
||
|
items, types, _, ok = result
|
||
|
if not ok:
|
||
|
return [], [], [], typename, False
|
||
|
if not types:
|
||
|
types = [AnyType(TypeOfAny.unannotated) for _ in items]
|
||
|
underscore = [item for item in items if item.startswith('_')]
|
||
|
if underscore:
|
||
|
self.fail(f'"{type_name}()" field names cannot start with an underscore: '
|
||
|
+ ', '.join(underscore), call)
|
||
|
if len(defaults) > len(items):
|
||
|
self.fail(f'Too many defaults given in call to "{type_name}()"', call)
|
||
|
defaults = defaults[:len(items)]
|
||
|
return items, types, defaults, typename, True
|
||
|
|
||
|
def parse_namedtuple_fields_with_types(self, nodes: List[Expression], context: Context
|
||
|
) -> Optional[Tuple[List[str], List[Type],
|
||
|
List[Expression], bool]]:
|
||
|
"""Parse typed named tuple fields.
|
||
|
|
||
|
Return (names, types, defaults, whether types are all ready), or None if error occurred.
|
||
|
"""
|
||
|
items: List[str] = []
|
||
|
types: List[Type] = []
|
||
|
for item in nodes:
|
||
|
if isinstance(item, TupleExpr):
|
||
|
if len(item.items) != 2:
|
||
|
self.fail('Invalid "NamedTuple()" field definition', item)
|
||
|
return None
|
||
|
name, type_node = item.items
|
||
|
if isinstance(name, (StrExpr, BytesExpr, UnicodeExpr)):
|
||
|
items.append(name.value)
|
||
|
else:
|
||
|
self.fail('Invalid "NamedTuple()" field name', item)
|
||
|
return None
|
||
|
try:
|
||
|
type = expr_to_unanalyzed_type(type_node, self.options, self.api.is_stub_file)
|
||
|
except TypeTranslationError:
|
||
|
self.fail('Invalid field type', type_node)
|
||
|
return None
|
||
|
analyzed = self.api.anal_type(type)
|
||
|
# Workaround #4987 and avoid introducing a bogus UnboundType
|
||
|
if isinstance(analyzed, UnboundType):
|
||
|
analyzed = AnyType(TypeOfAny.from_error)
|
||
|
# These should be all known, otherwise we would defer in visit_assignment_stmt().
|
||
|
if analyzed is None:
|
||
|
return [], [], [], False
|
||
|
types.append(analyzed)
|
||
|
else:
|
||
|
self.fail('Tuple expected as "NamedTuple()" field', item)
|
||
|
return None
|
||
|
return items, types, [], True
|
||
|
|
||
|
def build_namedtuple_typeinfo(self,
|
||
|
name: str,
|
||
|
items: List[str],
|
||
|
types: List[Type],
|
||
|
default_items: Mapping[str, Expression],
|
||
|
line: int) -> TypeInfo:
|
||
|
strtype = self.api.named_type('builtins.str')
|
||
|
implicit_any = AnyType(TypeOfAny.special_form)
|
||
|
basetuple_type = self.api.named_type('builtins.tuple', [implicit_any])
|
||
|
dictype = (self.api.named_type_or_none('builtins.dict', [strtype, implicit_any])
|
||
|
or self.api.named_type('builtins.object'))
|
||
|
# Actual signature should return OrderedDict[str, Union[types]]
|
||
|
ordereddictype = (self.api.named_type_or_none('builtins.dict', [strtype, implicit_any])
|
||
|
or self.api.named_type('builtins.object'))
|
||
|
fallback = self.api.named_type('builtins.tuple', [implicit_any])
|
||
|
# Note: actual signature should accept an invariant version of Iterable[UnionType[types]].
|
||
|
# but it can't be expressed. 'new' and 'len' should be callable types.
|
||
|
iterable_type = self.api.named_type_or_none('typing.Iterable', [implicit_any])
|
||
|
function_type = self.api.named_type('builtins.function')
|
||
|
|
||
|
literals: List[Type] = [LiteralType(item, strtype) for item in items]
|
||
|
match_args_type = TupleType(literals, basetuple_type)
|
||
|
|
||
|
info = self.api.basic_new_typeinfo(name, fallback, line)
|
||
|
info.is_named_tuple = True
|
||
|
tuple_base = TupleType(types, fallback)
|
||
|
info.tuple_type = tuple_base
|
||
|
info.line = line
|
||
|
# For use by mypyc.
|
||
|
info.metadata['namedtuple'] = {'fields': items.copy()}
|
||
|
|
||
|
# We can't calculate the complete fallback type until after semantic
|
||
|
# analysis, since otherwise base classes might be incomplete. Postpone a
|
||
|
# callback function that patches the fallback.
|
||
|
self.api.schedule_patch(PRIORITY_FALLBACKS,
|
||
|
lambda: calculate_tuple_fallback(tuple_base))
|
||
|
|
||
|
def add_field(var: Var, is_initialized_in_class: bool = False,
|
||
|
is_property: bool = False) -> None:
|
||
|
var.info = info
|
||
|
var.is_initialized_in_class = is_initialized_in_class
|
||
|
var.is_property = is_property
|
||
|
var._fullname = f'{info.fullname}.{var.name}'
|
||
|
info.names[var.name] = SymbolTableNode(MDEF, var)
|
||
|
|
||
|
fields = [Var(item, typ) for item, typ in zip(items, types)]
|
||
|
for var in fields:
|
||
|
add_field(var, is_property=True)
|
||
|
# We can't share Vars between fields and method arguments, since they
|
||
|
# have different full names (the latter are normally used as local variables
|
||
|
# in functions, so their full names are set to short names when generated methods
|
||
|
# are analyzed).
|
||
|
vars = [Var(item, typ) for item, typ in zip(items, types)]
|
||
|
|
||
|
tuple_of_strings = TupleType([strtype for _ in items], basetuple_type)
|
||
|
add_field(Var('_fields', tuple_of_strings), is_initialized_in_class=True)
|
||
|
add_field(Var('_field_types', dictype), is_initialized_in_class=True)
|
||
|
add_field(Var('_field_defaults', dictype), is_initialized_in_class=True)
|
||
|
add_field(Var('_source', strtype), is_initialized_in_class=True)
|
||
|
add_field(Var('__annotations__', ordereddictype), is_initialized_in_class=True)
|
||
|
add_field(Var('__doc__', strtype), is_initialized_in_class=True)
|
||
|
if self.options.python_version >= (3, 10):
|
||
|
add_field(Var('__match_args__', match_args_type), is_initialized_in_class=True)
|
||
|
|
||
|
tvd = TypeVarType(SELF_TVAR_NAME, info.fullname + '.' + SELF_TVAR_NAME,
|
||
|
-1, [], info.tuple_type)
|
||
|
selftype = tvd
|
||
|
|
||
|
def add_method(funcname: str,
|
||
|
ret: Type,
|
||
|
args: List[Argument],
|
||
|
is_classmethod: bool = False,
|
||
|
is_new: bool = False,
|
||
|
) -> None:
|
||
|
if is_classmethod or is_new:
|
||
|
first = [Argument(Var('_cls'), TypeType.make_normalized(selftype), None, ARG_POS)]
|
||
|
else:
|
||
|
first = [Argument(Var('_self'), selftype, None, ARG_POS)]
|
||
|
args = first + args
|
||
|
|
||
|
types = [arg.type_annotation for arg in args]
|
||
|
items = [arg.variable.name for arg in args]
|
||
|
arg_kinds = [arg.kind for arg in args]
|
||
|
assert None not in types
|
||
|
signature = CallableType(cast(List[Type], types), arg_kinds, items, ret,
|
||
|
function_type)
|
||
|
signature.variables = [tvd]
|
||
|
func = FuncDef(funcname, args, Block([]))
|
||
|
func.info = info
|
||
|
func.is_class = is_classmethod
|
||
|
func.type = set_callable_name(signature, func)
|
||
|
func._fullname = info.fullname + '.' + funcname
|
||
|
func.line = line
|
||
|
if is_classmethod:
|
||
|
v = Var(funcname, func.type)
|
||
|
v.is_classmethod = True
|
||
|
v.info = info
|
||
|
v._fullname = func._fullname
|
||
|
func.is_decorated = True
|
||
|
dec = Decorator(func, [NameExpr('classmethod')], v)
|
||
|
dec.line = line
|
||
|
sym = SymbolTableNode(MDEF, dec)
|
||
|
else:
|
||
|
sym = SymbolTableNode(MDEF, func)
|
||
|
sym.plugin_generated = True
|
||
|
info.names[funcname] = sym
|
||
|
|
||
|
add_method('_replace', ret=selftype,
|
||
|
args=[Argument(var, var.type, EllipsisExpr(), ARG_NAMED_OPT) for var in vars])
|
||
|
|
||
|
def make_init_arg(var: Var) -> Argument:
|
||
|
default = default_items.get(var.name, None)
|
||
|
kind = ARG_POS if default is None else ARG_OPT
|
||
|
return Argument(var, var.type, default, kind)
|
||
|
|
||
|
add_method('__new__', ret=selftype,
|
||
|
args=[make_init_arg(var) for var in vars],
|
||
|
is_new=True)
|
||
|
add_method('_asdict', args=[], ret=ordereddictype)
|
||
|
special_form_any = AnyType(TypeOfAny.special_form)
|
||
|
add_method('_make', ret=selftype, is_classmethod=True,
|
||
|
args=[Argument(Var('iterable', iterable_type), iterable_type, None, ARG_POS),
|
||
|
Argument(Var('new'), special_form_any, EllipsisExpr(), ARG_NAMED_OPT),
|
||
|
Argument(Var('len'), special_form_any, EllipsisExpr(), ARG_NAMED_OPT)])
|
||
|
|
||
|
self_tvar_expr = TypeVarExpr(SELF_TVAR_NAME, info.fullname + '.' + SELF_TVAR_NAME,
|
||
|
[], info.tuple_type)
|
||
|
info.names[SELF_TVAR_NAME] = SymbolTableNode(MDEF, self_tvar_expr)
|
||
|
return info
|
||
|
|
||
|
@contextmanager
|
||
|
def save_namedtuple_body(self, named_tuple_info: TypeInfo) -> Iterator[None]:
|
||
|
"""Preserve the generated body of class-based named tuple and then restore it.
|
||
|
|
||
|
Temporarily clear the names dict so we don't get errors about duplicate names
|
||
|
that were already set in build_namedtuple_typeinfo (we already added the tuple
|
||
|
field names while generating the TypeInfo, and actual duplicates are
|
||
|
already reported).
|
||
|
"""
|
||
|
nt_names = named_tuple_info.names
|
||
|
named_tuple_info.names = SymbolTable()
|
||
|
|
||
|
yield
|
||
|
|
||
|
# Make sure we didn't use illegal names, then reset the names in the typeinfo.
|
||
|
for prohibited in NAMEDTUPLE_PROHIBITED_NAMES:
|
||
|
if prohibited in named_tuple_info.names:
|
||
|
if nt_names.get(prohibited) is named_tuple_info.names[prohibited]:
|
||
|
continue
|
||
|
ctx = named_tuple_info.names[prohibited].node
|
||
|
assert ctx is not None
|
||
|
self.fail(f'Cannot overwrite NamedTuple attribute "{prohibited}"',
|
||
|
ctx)
|
||
|
|
||
|
# Restore the names in the original symbol table. This ensures that the symbol
|
||
|
# table contains the field objects created by build_namedtuple_typeinfo. Exclude
|
||
|
# __doc__, which can legally be overwritten by the class.
|
||
|
for key, value in nt_names.items():
|
||
|
if key in named_tuple_info.names:
|
||
|
if key == '__doc__':
|
||
|
continue
|
||
|
sym = named_tuple_info.names[key]
|
||
|
if isinstance(sym.node, (FuncBase, Decorator)) and not sym.plugin_generated:
|
||
|
# Keep user-defined methods as is.
|
||
|
continue
|
||
|
# Keep existing (user-provided) definitions under mangled names, so they
|
||
|
# get semantically analyzed.
|
||
|
r_key = get_unique_redefinition_name(key, named_tuple_info.names)
|
||
|
named_tuple_info.names[r_key] = sym
|
||
|
named_tuple_info.names[key] = value
|
||
|
|
||
|
# Helpers
|
||
|
|
||
|
def fail(self, msg: str, ctx: Context) -> None:
|
||
|
self.api.fail(msg, ctx)
|