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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.
#
import os
from textwrap import dedent
import libcst as cst
from libcst.helpers import (
parse_template_expression,
parse_template_module,
parse_template_statement,
)
from libcst.testing.utils import UnitTest
class TemplateTest(UnitTest):
def dedent(self, code: str) -> str:
lines = dedent(code).split(os.linesep)
if not lines[0].strip():
lines = lines[1:]
if not lines[-1].strip():
lines = [
*lines[:-1],
os.linesep,
]
return os.linesep.join(lines)
def code(self, node: cst.CSTNode) -> str:
return cst.Module([]).code_for_node(node)
def test_simple_module(self) -> None:
module = parse_template_module(
self.dedent(
"""
from {module} import {obj}
def foo() -> {obj}:
return {obj}()
"""
),
module=cst.Name("foo"),
obj=cst.Name("Bar"),
)
self.assertEqual(
module.code,
self.dedent(
"""
from foo import Bar
def foo() -> Bar:
return Bar()
"""
),
)
def test_simple_statement(self) -> None:
statement = parse_template_statement(
"assert {test}, {msg}\n",
test=cst.Name("True"),
msg=cst.SimpleString('"Somehow True is no longer True..."'),
)
self.assertEqual(
self.code(statement),
'assert True, "Somehow True is no longer True..."\n',
)
def test_simple_expression(self) -> None:
expression = parse_template_expression(
"{a} + {b} + {c}",
a=cst.Name("one"),
b=cst.Name("two"),
c=cst.BinaryOperation(
lpar=(cst.LeftParen(),),
left=cst.Name("three"),
operator=cst.Multiply(),
right=cst.Name("four"),
rpar=(cst.RightParen(),),
),
)
self.assertEqual(
self.code(expression),
"one + two + (three * four)",
)
def test_annotation(self) -> None:
# Test that we can insert an annotation expression normally.
statement = parse_template_statement(
"x: {type} = {val}",
type=cst.Name("int"),
val=cst.Integer("5"),
)
self.assertEqual(
self.code(statement),
"x: int = 5\n",
)
# Test that we can insert an annotation node as a special case.
statement = parse_template_statement(
"x: {type} = {val}",
type=cst.Annotation(cst.Name("int")),
val=cst.Integer("5"),
)
self.assertEqual(
self.code(statement),
"x: int = 5\n",
)
def test_assign_target(self) -> None:
# Test that we can insert an assignment target normally.
statement = parse_template_statement(
"{a} = {b} = {val}",
a=cst.Name("first"),
b=cst.Name("second"),
val=cst.Integer("5"),
)
self.assertEqual(
self.code(statement),
"first = second = 5\n",
)
# Test that we can insert an assignment target as a special case.
statement = parse_template_statement(
"{a} = {b} = {val}",
a=cst.AssignTarget(cst.Name("first")),
b=cst.AssignTarget(cst.Name("second")),
val=cst.Integer("5"),
)
self.assertEqual(
self.code(statement),
"first = second = 5\n",
)
def test_parameters(self) -> None:
# Test that we can insert a parameter into a function def normally.
statement = parse_template_statement(
"def foo({arg}): pass",
arg=cst.Name("bar"),
)
self.assertEqual(
self.code(statement),
"def foo(bar): pass\n",
)
# Test that we can insert a parameter as a special case.
statement = parse_template_statement(
"def foo({arg}): pass",
arg=cst.Param(cst.Name("bar")),
)
self.assertEqual(
self.code(statement),
"def foo(bar): pass\n",
)
# Test that we can insert a parameters list as a special case.
statement = parse_template_statement(
"def foo({args}): pass",
args=cst.Parameters(
(cst.Param(cst.Name("bar")),),
),
)
self.assertEqual(
self.code(statement),
"def foo(bar): pass\n",
)
# Test filling out multiple parameters
statement = parse_template_statement(
"def foo({args}): pass",
args=cst.Parameters(
params=(
cst.Param(cst.Name("bar")),
cst.Param(cst.Name("baz")),
),
star_kwarg=cst.Param(cst.Name("rest")),
),
)
self.assertEqual(
self.code(statement),
"def foo(bar, baz, **rest): pass\n",
)
def test_args(self) -> None:
# Test that we can insert an argument into a function call normally.
statement = parse_template_expression(
"foo({arg1}, {arg2})",
arg1=cst.Name("bar"),
arg2=cst.Name("baz"),
)
self.assertEqual(
self.code(statement),
"foo(bar, baz)",
)
# Test that we can insert an argument as a special case.
statement = parse_template_expression(
"foo({arg1}, {arg2})",
arg1=cst.Arg(cst.Name("bar")),
arg2=cst.Arg(cst.Name("baz")),
)
self.assertEqual(
self.code(statement),
"foo(bar, baz)",
)
def test_statement(self) -> None:
# Test that we can insert various types of statements into a
# statement list.
module = parse_template_module(
"{statement1}\n{statement2}\n{statement3}\n",
statement1=cst.If(
test=cst.Name("foo"),
body=cst.SimpleStatementSuite(
(cst.Pass(),),
),
),
statement2=cst.SimpleStatementLine(
(cst.Expr(cst.Call(cst.Name("bar"))),),
),
statement3=cst.Pass(),
)
self.assertEqual(
module.code,
"if foo: pass\nbar()\npass\n",
)
def test_suite(self) -> None:
# Test that we can insert various types of statement suites into a
# spot accepting a suite.
module = parse_template_module(
"if x is True: {suite}\n",
suite=cst.SimpleStatementSuite(
body=(cst.Pass(),),
),
)
self.assertEqual(
module.code,
"if x is True: pass\n",
)
module = parse_template_module(
"if x is True: {suite}\n",
suite=cst.IndentedBlock(
body=(
cst.SimpleStatementLine(
(cst.Pass(),),
),
),
),
)
self.assertEqual(
module.code,
"if x is True:\n pass\n",
)
module = parse_template_module(
"if x is True:\n {suite}\n",
suite=cst.SimpleStatementSuite(
body=(cst.Pass(),),
),
)
self.assertEqual(
module.code,
"if x is True: pass\n",
)
module = parse_template_module(
"if x is True:\n {suite}\n",
suite=cst.IndentedBlock(
body=(
cst.SimpleStatementLine(
(cst.Pass(),),
),
),
),
)
self.assertEqual(
module.code,
"if x is True:\n pass\n",
)
def test_subscript(self) -> None:
# Test that we can insert various subscript slices into an
# acceptible spot.
expression = parse_template_expression(
"Optional[{type}]",
type=cst.Name("int"),
)
self.assertEqual(
self.code(expression),
"Optional[int]",
)
expression = parse_template_expression(
"Tuple[{type1}, {type2}]",
type1=cst.Name("int"),
type2=cst.Name("str"),
)
self.assertEqual(
self.code(expression),
"Tuple[int, str]",
)
expression = parse_template_expression(
"Optional[{type}]",
type=cst.Index(cst.Name("int")),
)
self.assertEqual(
self.code(expression),
"Optional[int]",
)
expression = parse_template_expression(
"Optional[{type}]",
type=cst.SubscriptElement(cst.Index(cst.Name("int"))),
)
self.assertEqual(
self.code(expression),
"Optional[int]",
)
expression = parse_template_expression(
"foo[{slice}]",
slice=cst.Slice(cst.Integer("5"), cst.Integer("6")),
)
self.assertEqual(
self.code(expression),
"foo[5:6]",
)
expression = parse_template_expression(
"foo[{slice}]",
slice=cst.SubscriptElement(cst.Slice(cst.Integer("5"), cst.Integer("6"))),
)
self.assertEqual(
self.code(expression),
"foo[5:6]",
)
expression = parse_template_expression(
"foo[{slice}]",
slice=cst.Slice(cst.Integer("5"), cst.Integer("6")),
)
self.assertEqual(
self.code(expression),
"foo[5:6]",
)
expression = parse_template_expression(
"foo[{slice}]",
slice=cst.SubscriptElement(cst.Slice(cst.Integer("5"), cst.Integer("6"))),
)
self.assertEqual(
self.code(expression),
"foo[5:6]",
)
expression = parse_template_expression(
"foo[{slice1}, {slice2}]",
slice1=cst.Slice(cst.Integer("5"), cst.Integer("6")),
slice2=cst.Index(cst.Integer("7")),
)
self.assertEqual(
self.code(expression),
"foo[5:6, 7]",
)
expression = parse_template_expression(
"foo[{slice1}, {slice2}]",
slice1=cst.SubscriptElement(cst.Slice(cst.Integer("5"), cst.Integer("6"))),
slice2=cst.SubscriptElement(cst.Index(cst.Integer("7"))),
)
self.assertEqual(
self.code(expression),
"foo[5:6, 7]",
)
def test_decorators(self) -> None:
# Test that we can special-case decorators when needed.
statement = parse_template_statement(
"@{decorator}\ndef foo(): pass\n",
decorator=cst.Name("bar"),
)
self.assertEqual(
self.code(statement),
"@bar\ndef foo(): pass\n",
)
statement = parse_template_statement(
"@{decorator}\ndef foo(): pass\n",
decorator=cst.Decorator(cst.Name("bar")),
)
self.assertEqual(
self.code(statement),
"@bar\ndef foo(): pass\n",
)
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