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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, Optional
import libcst as cst
from libcst import parse_statement
from libcst._nodes.tests.base import CSTNodeTest, parse_statement_as
from libcst._parser.entrypoints import is_native
from libcst.helpers import ensure_type
from libcst.metadata import CodeRange
from libcst.testing.utils import data_provider
class YieldConstructionTest(CSTNodeTest):
@data_provider(
(
# Simple yield
(cst.Yield(), "yield"),
# yield expression
(cst.Yield(cst.Name("a")), "yield a"),
# yield from expression
(cst.Yield(cst.From(cst.Call(cst.Name("a")))), "yield from a()"),
# Parenthesizing tests
(
cst.Yield(
lpar=(cst.LeftParen(),),
value=cst.Integer("5"),
rpar=(cst.RightParen(),),
),
"(yield 5)",
),
# Whitespace oddities tests
(
cst.Yield(
cst.Name("a", lpar=(cst.LeftParen(),), rpar=(cst.RightParen(),)),
whitespace_after_yield=cst.SimpleWhitespace(""),
),
"yield(a)",
CodeRange((1, 0), (1, 8)),
),
(
cst.Yield(
cst.From(
cst.Call(
cst.Name("a"),
lpar=(cst.LeftParen(),),
rpar=(cst.RightParen(),),
),
whitespace_after_from=cst.SimpleWhitespace(""),
)
),
"yield from(a())",
),
# Whitespace rendering/parsing tests
(
cst.Yield(
lpar=(cst.LeftParen(whitespace_after=cst.SimpleWhitespace(" ")),),
value=cst.Integer("5"),
whitespace_after_yield=cst.SimpleWhitespace(" "),
rpar=(cst.RightParen(whitespace_before=cst.SimpleWhitespace(" ")),),
),
"( yield 5 )",
),
(
cst.Yield(
lpar=(cst.LeftParen(whitespace_after=cst.SimpleWhitespace(" ")),),
value=cst.From(
cst.Call(cst.Name("bla")),
whitespace_after_from=cst.SimpleWhitespace(" "),
),
whitespace_after_yield=cst.SimpleWhitespace(" "),
rpar=(cst.RightParen(whitespace_before=cst.SimpleWhitespace(" ")),),
),
"( yield from bla() )",
CodeRange((1, 2), (1, 20)),
),
# From expression position tests
(
cst.From(
cst.Integer("5"), whitespace_after_from=cst.SimpleWhitespace(" ")
),
"from 5",
CodeRange((1, 0), (1, 6)),
),
)
)
def test_valid(
self, node: cst.CSTNode, code: str, position: Optional[CodeRange] = None
) -> None:
self.validate_node(node, code, expected_position=position)
@data_provider(
(
# Paren validation
(
lambda: cst.Yield(lpar=(cst.LeftParen(),)),
"left paren without right paren",
),
(
lambda: cst.Yield(rpar=(cst.RightParen(),)),
"right paren without left paren",
),
# Make sure we have adequate space after yield
(
lambda: cst.Yield(
cst.Name("a"), whitespace_after_yield=cst.SimpleWhitespace("")
),
"Must have at least one space after 'yield' keyword",
),
(
lambda: cst.Yield(
cst.From(cst.Call(cst.Name("a"))),
whitespace_after_yield=cst.SimpleWhitespace(""),
),
"Must have at least one space after 'yield' keyword",
),
# MAke sure we have adequate space after from
(
lambda: cst.Yield(
cst.From(
cst.Call(cst.Name("a")),
whitespace_after_from=cst.SimpleWhitespace(""),
)
),
"Must have at least one space after 'from' keyword",
),
)
)
def test_invalid(
self, get_node: Callable[[], cst.CSTNode], expected_re: str
) -> None:
self.assert_invalid(get_node, expected_re)
class YieldParsingTest(CSTNodeTest):
@data_provider(
(
# Simple yield
(cst.Yield(), "yield"),
# yield expression
(
cst.Yield(
cst.Name("a"), whitespace_after_yield=cst.SimpleWhitespace(" ")
),
"yield a",
),
# yield from expression
(
cst.Yield(
cst.From(
cst.Call(cst.Name("a")),
whitespace_after_from=cst.SimpleWhitespace(" "),
),
whitespace_after_yield=cst.SimpleWhitespace(" "),
),
"yield from a()",
),
# Parenthesizing tests
(
cst.Yield(
lpar=(cst.LeftParen(),),
whitespace_after_yield=cst.SimpleWhitespace(" "),
value=cst.Integer("5"),
rpar=(cst.RightParen(),),
),
"(yield 5)",
),
# Whitespace oddities tests
(
cst.Yield(
cst.Name("a", lpar=(cst.LeftParen(),), rpar=(cst.RightParen(),)),
whitespace_after_yield=cst.SimpleWhitespace(""),
),
"yield(a)",
),
(
cst.Yield(
cst.From(
cst.Call(
cst.Name("a"),
lpar=(cst.LeftParen(),),
rpar=(cst.RightParen(),),
),
whitespace_after_from=cst.SimpleWhitespace(""),
),
whitespace_after_yield=cst.SimpleWhitespace(" "),
),
"yield from(a())",
),
# Whitespace rendering/parsing tests
(
cst.Yield(
lpar=(cst.LeftParen(whitespace_after=cst.SimpleWhitespace(" ")),),
value=cst.Integer("5"),
whitespace_after_yield=cst.SimpleWhitespace(" "),
rpar=(cst.RightParen(whitespace_before=cst.SimpleWhitespace(" ")),),
),
"( yield 5 )",
),
(
cst.Yield(
lpar=(cst.LeftParen(whitespace_after=cst.SimpleWhitespace(" ")),),
value=cst.From(
cst.Call(cst.Name("bla")),
whitespace_after_from=cst.SimpleWhitespace(" "),
),
whitespace_after_yield=cst.SimpleWhitespace(" "),
rpar=(cst.RightParen(whitespace_before=cst.SimpleWhitespace(" ")),),
),
"( yield from bla() )",
),
)
)
def test_valid(
self, node: cst.CSTNode, code: str, position: Optional[CodeRange] = None
) -> None:
self.validate_node(
node,
code,
lambda code: ensure_type(
ensure_type(parse_statement(code), cst.SimpleStatementLine).body[0],
cst.Expr,
).value,
)
@data_provider(
(
{
"code": "yield from x",
"parser": parse_statement_as(python_version="3.3"),
"expect_success": True,
},
{
"code": "yield from x",
"parser": parse_statement_as(python_version="3.1"),
"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)
|
