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from __future__ import annotations
import pytest
from pyupgrade._data import Settings
from pyupgrade._main import _fix_plugins
@pytest.mark.parametrize(
's',
(
# syntax error
'(',
# invalid format strings
"'{'.format(a)", "'}'.format(a)",
# weird syntax
'"{}" . format(x)',
# spans multiple lines
'"{}".format(\n a,\n)',
# starargs
'"{} {}".format(*a)', '"{foo} {bar}".format(**b)"',
# likely makes the format longer
'"{0} {0}".format(arg)', '"{x} {x}".format(arg)',
'"{x.y} {x.z}".format(arg)',
# bytestrings don't participate in `.format()` or `f''`
# but are legal in python 2
'b"{} {}".format(a, b)',
# for now, too difficult to rewrite correctly
'"{:{}}".format(x, y)',
'"{a[b]}".format(a=a)',
'"{a.a[b]}".format(a=a)',
# not enough placeholders / placeholders missing
'"{}{}".format(a)', '"{a}{b}".format(a=a)',
# backslashes and quotes cannot nest
r'''"{}".format(a['\\'])''',
'"{}".format(a["b"])',
"'{}'.format(a['b'])",
# await only becomes keyword in Python 3.7+
"async def c(): return '{}'.format(await 3)",
"async def c(): return '{}'.format(1 + await 3)",
),
)
def test_fix_fstrings_noop(s):
assert _fix_plugins(s, settings=Settings(min_version=(3, 6))) == s
@pytest.mark.parametrize(
('s', 'expected'),
(
('"{} {}".format(a, b)', 'f"{a} {b}"'),
('"{1} {0}".format(a, b)', 'f"{b} {a}"'),
('"{x.y}".format(x=z)', 'f"{z.y}"'),
('"{.x} {.y}".format(a, b)', 'f"{a.x} {b.y}"'),
('"{} {}".format(a.b, c.d)', 'f"{a.b} {c.d}"'),
('"{}".format(a())', 'f"{a()}"'),
('"{}".format(a.b())', 'f"{a.b()}"'),
('"{}".format(a.b().c())', 'f"{a.b().c()}"'),
('"hello {}!".format(name)', 'f"hello {name}!"'),
('"{}{{}}{}".format(escaped, y)', 'f"{escaped}{{}}{y}"'),
('"{}{b}{}".format(a, c, b=b)', 'f"{a}{b}{c}"'),
('"{}".format(0x0)', 'f"{0x0}"'),
pytest.param(
r'"\N{snowman} {}".format(a)',
r'f"\N{snowman} {a}"',
id='named escape sequences',
),
pytest.param(
'u"foo{}".format(1)',
'f"foo{1}"',
id='u-prefixed format',
),
),
)
def test_fix_fstrings(s, expected):
assert _fix_plugins(s, settings=Settings(min_version=(3, 6))) == expected
def test_fix_fstrings_await_py37():
s = "async def c(): return '{}'.format(await 1+foo())"
expected = "async def c(): return f'{await 1+foo()}'"
assert _fix_plugins(s, settings=Settings(min_version=(3, 7))) == expected
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