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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 Callable, Optional
import libcst as cst
from libcst import parse_expression
from libcst._nodes.tests.base import CSTNodeTest
from libcst.metadata import CodeRange
from libcst.testing.utils import data_provider
class TemplatedStringTest(CSTNodeTest):
@data_provider(
(
# Simple t-string with only text
(
cst.TemplatedString(
parts=(cst.TemplatedStringText("hello world"),),
),
't"hello world"',
True,
),
# t-string with one expression
(
cst.TemplatedString(
parts=(
cst.TemplatedStringText("hello "),
cst.TemplatedStringExpression(
expression=cst.Name("name"),
),
),
),
't"hello {name}"',
True,
),
# t-string with multiple expressions
(
cst.TemplatedString(
parts=(
cst.TemplatedStringText("a="),
cst.TemplatedStringExpression(expression=cst.Name("a")),
cst.TemplatedStringText(", b="),
cst.TemplatedStringExpression(expression=cst.Name("b")),
),
),
't"a={a}, b={b}"',
True,
CodeRange((1, 0), (1, 15)),
),
# t-string with nested expression
(
cst.TemplatedString(
parts=(
cst.TemplatedStringText("sum="),
cst.TemplatedStringExpression(
expression=cst.BinaryOperation(
left=cst.Name("a"),
operator=cst.Add(),
right=cst.Name("b"),
)
),
),
),
't"sum={a + b}"',
True,
),
# t-string with spacing in expression
(
cst.TemplatedString(
parts=(
cst.TemplatedStringText("x = "),
cst.TemplatedStringExpression(
whitespace_before_expression=cst.SimpleWhitespace(" "),
expression=cst.Name("x"),
whitespace_after_expression=cst.SimpleWhitespace(" "),
),
),
),
't"x = { x }"',
True,
),
# t-string with escaped braces
(
cst.TemplatedString(
parts=(cst.TemplatedStringText("{{foo}}"),),
),
't"{{foo}}"',
True,
),
# t-string with only an expression
(
cst.TemplatedString(
parts=(
cst.TemplatedStringExpression(expression=cst.Name("value")),
),
),
't"{value}"',
True,
),
# t-string with whitespace and newlines
(
cst.TemplatedString(
parts=(
cst.TemplatedStringText("line1\\n"),
cst.TemplatedStringExpression(expression=cst.Name("x")),
cst.TemplatedStringText("\\nline2"),
),
),
't"line1\\n{x}\\nline2"',
True,
),
# t-string with parenthesis (not typical, but test node construction)
(
cst.TemplatedString(
lpar=(cst.LeftParen(),),
parts=(cst.TemplatedStringText("foo"),),
rpar=(cst.RightParen(),),
),
'(t"foo")',
True,
),
# t-string with whitespace in delimiters
(
cst.TemplatedString(
lpar=(cst.LeftParen(whitespace_after=cst.SimpleWhitespace(" ")),),
parts=(cst.TemplatedStringText("foo"),),
rpar=(cst.RightParen(whitespace_before=cst.SimpleWhitespace(" ")),),
),
'( t"foo" )',
True,
),
# Test TemplatedStringText and TemplatedStringExpression individually
(
cst.TemplatedStringText("abc"),
"abc",
False,
CodeRange((1, 0), (1, 3)),
),
(
cst.TemplatedStringExpression(expression=cst.Name("foo")),
"{foo}",
False,
CodeRange((1, 0), (1, 5)),
),
)
)
def test_valid(
self,
node: cst.CSTNode,
code: str,
check_parsing: bool,
position: Optional[CodeRange] = None,
) -> None:
if check_parsing:
self.validate_node(node, code, parse_expression, expected_position=position)
else:
self.validate_node(node, code, expected_position=position)
@data_provider(
(
(
lambda: cst.TemplatedString(
parts=(cst.TemplatedStringText("foo"),),
lpar=(cst.LeftParen(),),
),
"left paren without right paren",
),
(
lambda: cst.TemplatedString(
parts=(cst.TemplatedStringText("foo"),),
rpar=(cst.RightParen(),),
),
"right paren without left paren",
),
)
)
def test_invalid(
self, get_node: Callable[[], cst.CSTNode], expected_re: str
) -> None:
self.assert_invalid(get_node, expected_re)
|
