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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 import parse_expression
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 DictTest(CSTNodeTest):
@data_provider(
[
# zero-element dict
{
"node": cst.Dict([]),
"code": "{}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 2)),
},
# one-element dict, sentinel comma value
{
"node": cst.Dict([cst.DictElement(cst.Name("k"), cst.Name("v"))]),
"code": "{k: v}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 6)),
},
{
"node": cst.Dict([cst.StarredDictElement(cst.Name("expanded"))]),
"code": "{**expanded}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 12)),
},
# two-element dict, sentinel comma value
{
"node": cst.Dict(
[
cst.DictElement(cst.Name("k1"), cst.Name("v1")),
cst.DictElement(cst.Name("k2"), cst.Name("v2")),
]
),
"code": "{k1: v1, k2: v2}",
"parser": None,
"expected_position": CodeRange((1, 0), (1, 16)),
},
# custom whitespace between brackets
{
"node": cst.Dict(
[cst.DictElement(cst.Name("k"), cst.Name("v"))],
lbrace=cst.LeftCurlyBrace(
whitespace_after=cst.SimpleWhitespace("\t")
),
rbrace=cst.RightCurlyBrace(
whitespace_before=cst.SimpleWhitespace("\t\t")
),
),
"code": "{\tk: v\t\t}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 9)),
},
# with parenthesis
{
"node": cst.Dict(
[cst.DictElement(cst.Name("k"), cst.Name("v"))],
lpar=[cst.LeftParen()],
rpar=[cst.RightParen()],
),
"code": "({k: v})",
"parser": parse_expression,
"expected_position": CodeRange((1, 1), (1, 7)),
},
# starred element
{
"node": cst.Dict(
[
cst.StarredDictElement(cst.Name("one")),
cst.StarredDictElement(cst.Name("two")),
]
),
"code": "{**one, **two}",
"parser": None,
"expected_position": CodeRange((1, 0), (1, 14)),
},
# custom comma on DictElement
{
"node": cst.Dict(
[cst.DictElement(cst.Name("k"), cst.Name("v"), comma=cst.Comma())]
),
"code": "{k: v,}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 7)),
},
# custom comma on StarredDictElement
{
"node": cst.Dict(
[cst.StarredDictElement(cst.Name("expanded"), comma=cst.Comma())]
),
"code": "{**expanded,}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 13)),
},
# custom whitespace on DictElement
{
"node": cst.Dict(
[
cst.DictElement(
cst.Name("k"),
cst.Name("v"),
whitespace_before_colon=cst.SimpleWhitespace("\t"),
whitespace_after_colon=cst.SimpleWhitespace("\t\t"),
)
]
),
"code": "{k\t:\t\tv}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 8)),
},
# custom whitespace on StarredDictElement
{
"node": cst.Dict(
[
cst.DictElement(
cst.Name("k"), cst.Name("v"), comma=cst.Comma()
),
cst.StarredDictElement(
cst.Name("expanded"),
whitespace_before_value=cst.SimpleWhitespace(" "),
),
]
),
"code": "{k: v,** expanded}",
"parser": parse_expression,
"expected_position": CodeRange((1, 0), (1, 19)),
},
# missing spaces around dict is always okay
{
"node": cst.GeneratorExp(
cst.Name("a"),
cst.CompFor(
cst.Name("b"),
cst.Dict([cst.DictElement(cst.Name("k"), cst.Name("v"))]),
ifs=[
cst.CompIf(
cst.Name("c"),
whitespace_before=cst.SimpleWhitespace(""),
)
],
whitespace_after_in=cst.SimpleWhitespace(""),
),
),
"parser": parse_expression,
"code": "(a for b in{k: v}if c)",
},
]
)
def test_valid(self, **kwargs: Any) -> None:
self.validate_node(**kwargs)
@data_provider(
[
# unbalanced Dict
{
"get_node": lambda: cst.Dict([], lpar=[cst.LeftParen()]),
"expected_re": "left paren without right paren",
}
]
)
def test_invalid(self, **kwargs: Any) -> None:
self.assert_invalid(**kwargs)
@data_provider(
(
{
"code": "{**{}}",
"parser": parse_expression_as(python_version="3.5"),
"expect_success": True,
},
{
"code": "{**{}}",
"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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