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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, Callable
import libcst as cst
from libcst import parse_expression
from libcst._nodes.tests.base import CSTNodeTest, parse_expression_as
from libcst._parser.entrypoints import is_native
from libcst.testing.utils import data_provider
class ListTest(CSTNodeTest):
# A lot of Element/StarredElement tests are provided by the tests for Tuple, so we
# we don't need to duplicate them here.
@data_provider(
[
# one-element list, sentinel comma value
{
"node": cst.Set([cst.Element(cst.Name("single_element"))]),
"code": "{single_element}",
"parser": parse_expression,
},
# custom whitespace between brackets
{
"node": cst.Set(
[cst.Element(cst.Name("single_element"))],
lbrace=cst.LeftCurlyBrace(
whitespace_after=cst.SimpleWhitespace("\t")
),
rbrace=cst.RightCurlyBrace(
whitespace_before=cst.SimpleWhitespace(" ")
),
),
"code": "{\tsingle_element }",
"parser": parse_expression,
},
# two-element list, sentinel comma value
{
"node": cst.Set(
[cst.Element(cst.Name("one")), cst.Element(cst.Name("two"))]
),
"code": "{one, two}",
"parser": None,
},
# with parenthesis
{
"node": cst.Set(
[cst.Element(cst.Name("one"))],
lpar=[cst.LeftParen()],
rpar=[cst.RightParen()],
),
"code": "({one})",
"parser": None,
},
# starred element
{
"node": cst.Set(
[
cst.StarredElement(cst.Name("one")),
cst.StarredElement(cst.Name("two")),
]
),
"code": "{*one, *two}",
"parser": None,
},
# missing spaces around set, always okay
{
"node": cst.GeneratorExp(
cst.Name("elt"),
cst.CompFor(
target=cst.Name("elt"),
iter=cst.Set(
[
cst.Element(
cst.Name("one"),
cst.Comma(
whitespace_after=cst.SimpleWhitespace(" ")
),
),
cst.Element(cst.Name("two")),
]
),
ifs=[
cst.CompIf(
cst.Name("test"),
whitespace_before=cst.SimpleWhitespace(""),
)
],
whitespace_after_in=cst.SimpleWhitespace(""),
),
),
"code": "(elt for elt in{one, two}if test)",
"parser": parse_expression,
},
]
)
def test_valid(self, **kwargs: Any) -> None:
self.validate_node(**kwargs)
@data_provider(
(
(
lambda: cst.Set(
[cst.Element(cst.Name("mismatched"))],
lpar=[cst.LeftParen(), cst.LeftParen()],
rpar=[cst.RightParen()],
),
"unbalanced parens",
),
(lambda: cst.Set([]), "at least one element"),
)
)
def test_invalid(
self, get_node: Callable[[], cst.CSTNode], expected_re: str
) -> None:
self.assert_invalid(get_node, expected_re)
@data_provider(
(
{
"code": "{*x, 2}",
"parser": parse_expression_as(python_version="3.5"),
"expect_success": True,
},
{
"code": "{*x, 2}",
"parser": parse_expression_as(python_version="3.3"),
"expect_success": False,
},
)
)
def test_versions(self, **kwargs: Any) -> None:
if is_native() and not kwargs.get("expect_success", True):
self.skipTest("parse errors are disabled for native parser")
self.assert_parses(**kwargs)
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