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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_statement
from libcst._nodes.tests.base import CSTNodeTest, DummyIndentedBlock
from libcst.metadata import CodeRange
from libcst.testing.utils import data_provider
class IfTest(CSTNodeTest):
@data_provider(
(
# Simple if without elif or else
{
"node": cst.If(
cst.Name("conditional"), cst.SimpleStatementSuite((cst.Pass(),))
),
"code": "if conditional: pass\n",
"parser": parse_statement,
"expected_position": CodeRange((1, 0), (1, 20)),
},
# else clause
{
"node": cst.If(
cst.Name("conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
orelse=cst.Else(cst.SimpleStatementSuite((cst.Pass(),))),
),
"code": "if conditional: pass\nelse: pass\n",
"parser": parse_statement,
"expected_position": CodeRange((1, 0), (2, 10)),
},
# elif clause
{
"node": cst.If(
cst.Name("conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
orelse=cst.If(
cst.Name("other_conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
orelse=cst.Else(cst.SimpleStatementSuite((cst.Pass(),))),
),
),
"code": "if conditional: pass\nelif other_conditional: pass\nelse: pass\n",
"parser": parse_statement,
"expected_position": CodeRange((1, 0), (3, 10)),
},
# indentation
{
"node": DummyIndentedBlock(
" ",
cst.If(
cst.Name("conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
orelse=cst.Else(cst.SimpleStatementSuite((cst.Pass(),))),
),
),
"code": " if conditional: pass\n else: pass\n",
"parser": None,
"expected_position": CodeRange((1, 4), (2, 14)),
},
# with an indented body
{
"node": DummyIndentedBlock(
" ",
cst.If(
cst.Name("conditional"),
cst.IndentedBlock((cst.SimpleStatementLine((cst.Pass(),)),)),
),
),
"code": " if conditional:\n pass\n",
"parser": None,
"expected_position": CodeRange((1, 4), (2, 12)),
},
# leading_lines
{
"node": cst.If(
cst.Name("conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
leading_lines=(
cst.EmptyLine(comment=cst.Comment("# leading comment")),
),
),
"code": "# leading comment\nif conditional: pass\n",
"parser": parse_statement,
"expected_position": CodeRange((2, 0), (2, 20)),
},
# whitespace before/after test and else
{
"node": cst.If(
cst.Name("conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
whitespace_before_test=cst.SimpleWhitespace(" "),
whitespace_after_test=cst.SimpleWhitespace(" "),
orelse=cst.Else(
cst.SimpleStatementSuite((cst.Pass(),)),
whitespace_before_colon=cst.SimpleWhitespace(" "),
),
),
"code": "if conditional : pass\nelse : pass\n",
"parser": parse_statement,
"expected_position": CodeRange((1, 0), (2, 11)),
},
# empty lines between if/elif/else clauses, not captured by the suite.
{
"node": cst.If(
cst.Name("test_a"),
cst.SimpleStatementSuite((cst.Pass(),)),
orelse=cst.If(
cst.Name("test_b"),
cst.SimpleStatementSuite((cst.Pass(),)),
leading_lines=(cst.EmptyLine(),),
orelse=cst.Else(
cst.SimpleStatementSuite((cst.Pass(),)),
leading_lines=(cst.EmptyLine(),),
),
),
),
"code": "if test_a: pass\n\nelif test_b: pass\n\nelse: pass\n",
"parser": parse_statement,
"expected_position": CodeRange((1, 0), (5, 10)),
},
)
)
def test_valid(self, **kwargs: Any) -> None:
self.validate_node(**kwargs)
@data_provider(
(
# Validate whitespace handling
(
lambda: cst.If(
cst.Name("conditional"),
cst.SimpleStatementSuite((cst.Pass(),)),
whitespace_before_test=cst.SimpleWhitespace(""),
),
"Must have at least one space after 'if' keyword.",
),
)
)
def test_invalid(
self, get_node: Callable[[], cst.CSTNode], expected_re: str
) -> None:
self.assert_invalid(get_node, expected_re)
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