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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, parse_statement
from libcst._nodes.tests.base import CSTNodeTest, parse_expression_as
from libcst._parser.entrypoints import is_native
from libcst.metadata import CodeRange
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(
[
# zero-element list
{"node": cst.List([]), "code": "[]", "parser": parse_expression},
# one-element list, sentinel comma value
{
"node": cst.List([cst.Element(cst.Name("single_element"))]),
"code": "[single_element]",
"parser": parse_expression,
},
# custom whitespace between brackets
{
"node": cst.List(
[cst.Element(cst.Name("single_element"))],
lbracket=cst.LeftSquareBracket(
whitespace_after=cst.SimpleWhitespace("\t")
),
rbracket=cst.RightSquareBracket(
whitespace_before=cst.SimpleWhitespace(" ")
),
),
"code": "[\tsingle_element ]",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 21)),
},
# two-element list, sentinel comma value
{
"node": cst.List(
[cst.Element(cst.Name("one")), cst.Element(cst.Name("two"))]
),
"code": "[one, two]",
"parser": None,
},
# with parenthesis
{
"node": cst.List(
[cst.Element(cst.Name("one"))],
lpar=[cst.LeftParen()],
rpar=[cst.RightParen()],
),
"code": "([one])",
"parser": None,
"expected_position": CodeRange((1, 1), (1, 6)),
},
# starred element
{
"node": cst.List(
[
cst.StarredElement(cst.Name("one")),
cst.StarredElement(cst.Name("two")),
]
),
"code": "[*one, *two]",
"parser": None,
"expected_position": CodeRange((1, 0), (1, 12)),
},
# missing spaces around list, always okay
{
"node": cst.For(
target=cst.List(
[
cst.Element(cst.Name("k"), comma=cst.Comma()),
cst.Element(cst.Name("v")),
]
),
iter=cst.Name("abc"),
body=cst.SimpleStatementSuite([cst.Pass()]),
whitespace_after_for=cst.SimpleWhitespace(""),
whitespace_before_in=cst.SimpleWhitespace(""),
),
"code": "for[k,v]in abc: pass\n",
"parser": parse_statement,
},
]
)
def test_valid(self, **kwargs: Any) -> None:
self.validate_node(**kwargs)
@data_provider(
(
(
lambda: cst.List(
[cst.Element(cst.Name("mismatched"))],
lpar=[cst.LeftParen(), cst.LeftParen()],
rpar=[cst.RightParen()],
),
"unbalanced parens",
),
)
)
def test_invalid(
self, get_node: Callable[[], cst.CSTNode], expected_re: str
) -> None:
self.assert_invalid(get_node, expected_re)
@data_provider(
(
{
"code": "[a, *b]",
"parser": parse_expression_as(python_version="3.5"),
"expect_success": True,
},
{
"code": "[a, *b]",
"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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