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# Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html
# For details: https://github.com/PyCQA/astroid/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/astroid/blob/main/CONTRIBUTORS.txt
from __future__ import annotations
import ast
import sys
import types
from collections.abc import Callable
from functools import partial
from typing import NamedTuple
from astroid.const import PY38_PLUS, Context
if sys.version_info >= (3, 8):
# On Python 3.8, typed_ast was merged back into `ast`
_ast_py3: types.ModuleType | None = ast
else:
try:
import typed_ast.ast3 as _ast_py3
except ImportError:
_ast_py3 = None
class FunctionType(NamedTuple):
argtypes: list[ast.expr]
returns: ast.expr
class ParserModule(NamedTuple):
module: types.ModuleType
unary_op_classes: dict[type[ast.unaryop], str]
cmp_op_classes: dict[type[ast.cmpop], str]
bool_op_classes: dict[type[ast.boolop], str]
bin_op_classes: dict[type[ast.operator], str]
context_classes: dict[type[ast.expr_context], Context]
def parse(self, string: str, type_comments: bool = True) -> ast.Module:
parse_func: Callable[[str], ast.Module]
if self.module is _ast_py3:
if PY38_PLUS:
parse_func = partial(self.module.parse, type_comments=type_comments)
else:
parse_func = partial(
self.module.parse, feature_version=sys.version_info.minor
)
else:
parse_func = self.module.parse
return parse_func(string)
def parse_function_type_comment(type_comment: str) -> FunctionType | None:
"""Given a correct type comment, obtain a FunctionType object."""
if _ast_py3 is None:
return None
func_type = _ast_py3.parse(type_comment, "<type_comment>", "func_type") # type: ignore[attr-defined]
return FunctionType(argtypes=func_type.argtypes, returns=func_type.returns)
def get_parser_module(type_comments: bool = True) -> ParserModule:
parser_module = ast
if type_comments and _ast_py3:
parser_module = _ast_py3
unary_op_classes = _unary_operators_from_module(parser_module)
cmp_op_classes = _compare_operators_from_module(parser_module)
bool_op_classes = _bool_operators_from_module(parser_module)
bin_op_classes = _binary_operators_from_module(parser_module)
context_classes = _contexts_from_module(parser_module)
return ParserModule(
parser_module,
unary_op_classes,
cmp_op_classes,
bool_op_classes,
bin_op_classes,
context_classes,
)
def _unary_operators_from_module(
module: types.ModuleType,
) -> dict[type[ast.unaryop], str]:
return {module.UAdd: "+", module.USub: "-", module.Not: "not", module.Invert: "~"}
def _binary_operators_from_module(
module: types.ModuleType,
) -> dict[type[ast.operator], str]:
binary_operators = {
module.Add: "+",
module.BitAnd: "&",
module.BitOr: "|",
module.BitXor: "^",
module.Div: "/",
module.FloorDiv: "//",
module.MatMult: "@",
module.Mod: "%",
module.Mult: "*",
module.Pow: "**",
module.Sub: "-",
module.LShift: "<<",
module.RShift: ">>",
}
return binary_operators
def _bool_operators_from_module(
module: types.ModuleType,
) -> dict[type[ast.boolop], str]:
return {module.And: "and", module.Or: "or"}
def _compare_operators_from_module(
module: types.ModuleType,
) -> dict[type[ast.cmpop], str]:
return {
module.Eq: "==",
module.Gt: ">",
module.GtE: ">=",
module.In: "in",
module.Is: "is",
module.IsNot: "is not",
module.Lt: "<",
module.LtE: "<=",
module.NotEq: "!=",
module.NotIn: "not in",
}
def _contexts_from_module(
module: types.ModuleType,
) -> dict[type[ast.expr_context], Context]:
return {
module.Load: Context.Load,
module.Store: Context.Store,
module.Del: Context.Del,
module.Param: Context.Store,
}
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