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# Copyright (c) Meta Platforms, Inc. and affiliates.
#
# This source code is licensed under the MIT license found in the
# LICENSE file in the root directory of this source tree.
from typing import Any
import libcst as cst
from libcst._nodes.tests.base import CSTNodeTest
from libcst.metadata import CodeRange
from libcst.testing.utils import data_provider
def _parse_expression_force_38(code: str) -> cst.BaseExpression:
return cst.parse_expression(
code, config=cst.PartialParserConfig(python_version="3.8")
)
def _parse_statement_force_38(code: str) -> cst.BaseCompoundStatement:
statement = cst.parse_statement(
code, config=cst.PartialParserConfig(python_version="3.8")
)
if not isinstance(statement, cst.BaseCompoundStatement):
raise ValueError(
"This function is expecting to parse compound statements only!"
)
return statement
class NamedExprTest(CSTNodeTest):
@data_provider(
(
# Simple named expression
{
"node": cst.NamedExpr(cst.Name("x"), cst.Float("5.5")),
"code": "x := 5.5",
"parser": None, # Walrus operator is illegal as top-level statement
"expected_position": None,
},
# Parenthesized named expression
{
"node": cst.NamedExpr(
lpar=(cst.LeftParen(),),
target=cst.Name("foo"),
value=cst.Integer("5"),
rpar=(cst.RightParen(),),
),
"code": "(foo := 5)",
"parser": _parse_expression_force_38,
"expected_position": CodeRange((1, 1), (1, 9)),
},
# Make sure that spacing works
{
"node": cst.NamedExpr(
lpar=(cst.LeftParen(whitespace_after=cst.SimpleWhitespace(" ")),),
target=cst.Name("foo"),
whitespace_before_walrus=cst.SimpleWhitespace(" "),
whitespace_after_walrus=cst.SimpleWhitespace(" "),
value=cst.Name("bar"),
rpar=(cst.RightParen(whitespace_before=cst.SimpleWhitespace(" ")),),
),
"code": "( foo := bar )",
"parser": _parse_expression_force_38,
"expected_position": CodeRange((1, 2), (1, 14)),
},
# Make sure we can use these where allowed in if/while statements
{
"node": cst.While(
test=cst.NamedExpr(
target=cst.Name(value="x"),
value=cst.Call(func=cst.Name(value="some_input")),
),
body=cst.SimpleStatementSuite(body=[cst.Pass()]),
),
"code": "while x := some_input(): pass\n",
"parser": _parse_statement_force_38,
"expected_position": None,
},
{
"node": cst.If(
test=cst.NamedExpr(
target=cst.Name(value="x"),
value=cst.Call(func=cst.Name(value="some_input")),
),
body=cst.SimpleStatementSuite(body=[cst.Pass()]),
),
"code": "if x := some_input(): pass\n",
"parser": _parse_statement_force_38,
"expected_position": None,
},
{
"node": cst.If(
test=cst.NamedExpr(
target=cst.Name(value="x"),
value=cst.Integer(value="1"),
whitespace_before_walrus=cst.SimpleWhitespace(""),
whitespace_after_walrus=cst.SimpleWhitespace(""),
),
body=cst.SimpleStatementSuite(body=[cst.Pass()]),
),
"code": "if x:=1: pass\n",
"parser": _parse_statement_force_38,
"expected_position": None,
},
# Function args
{
"node": cst.Call(
func=cst.Name(value="f"),
args=[
cst.Arg(
value=cst.NamedExpr(
target=cst.Name(value="y"),
value=cst.Integer(value="1"),
whitespace_before_walrus=cst.SimpleWhitespace(""),
whitespace_after_walrus=cst.SimpleWhitespace(""),
)
),
],
),
"code": "f(y:=1)",
"parser": _parse_expression_force_38,
"expected_position": None,
},
# Whitespace handling on args is fragile
{
"node": cst.Call(
func=cst.Name(value="f"),
args=[
cst.Arg(
value=cst.Name(value="x"),
comma=cst.Comma(
whitespace_after=cst.SimpleWhitespace(" ")
),
),
cst.Arg(
value=cst.NamedExpr(
target=cst.Name(value="y"),
value=cst.Integer(value="1"),
whitespace_before_walrus=cst.SimpleWhitespace(" "),
whitespace_after_walrus=cst.SimpleWhitespace(" "),
),
whitespace_after_arg=cst.SimpleWhitespace(" "),
),
],
),
"code": "f(x, y := 1 )",
"parser": _parse_expression_force_38,
"expected_position": None,
},
{
"node": cst.Call(
func=cst.Name(value="f"),
args=[
cst.Arg(
value=cst.NamedExpr(
target=cst.Name(value="y"),
value=cst.Integer(value="1"),
whitespace_before_walrus=cst.SimpleWhitespace(" "),
whitespace_after_walrus=cst.SimpleWhitespace(" "),
),
whitespace_after_arg=cst.SimpleWhitespace(" "),
),
],
whitespace_before_args=cst.SimpleWhitespace(" "),
),
"code": "f( y := 1 )",
"parser": _parse_expression_force_38,
"expected_position": None,
},
{
"node": cst.ListComp(
elt=cst.NamedExpr(
cst.Name("_"),
cst.SimpleString("''"),
whitespace_after_walrus=cst.SimpleWhitespace(""),
whitespace_before_walrus=cst.SimpleWhitespace(""),
),
for_in=cst.CompFor(
target=cst.Name("_"),
iter=cst.Name("_"),
whitespace_before=cst.SimpleWhitespace(""),
),
),
"code": "[_:=''for _ in _]",
},
)
)
def test_valid(self, **kwargs: Any) -> None:
self.validate_node(**kwargs)
@data_provider(
(
{
"get_node": (
lambda: cst.NamedExpr(
cst.Name("foo"), cst.Name("bar"), lpar=(cst.LeftParen(),)
)
),
"expected_re": "left paren without right paren",
},
{
"get_node": (
lambda: cst.NamedExpr(
cst.Name("foo"), cst.Name("bar"), rpar=(cst.RightParen(),)
)
),
"expected_re": "right paren without left paren",
},
)
)
def test_invalid(self, **kwargs: Any) -> None:
self.assert_invalid(**kwargs)
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