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import pickle
import unittest
from collections.abc import Iterator, Iterable
from string.templatelib import Template, Interpolation, convert
from test.test_string._support import TStringBaseCase, fstring
class TestTemplate(unittest.TestCase, TStringBaseCase):
def test_common(self):
self.assertEqual(type(t'').__name__, 'Template')
self.assertEqual(type(t'').__qualname__, 'Template')
self.assertEqual(type(t'').__module__, 'string.templatelib')
a = 'a'
i = t'{a}'.interpolations[0]
self.assertEqual(type(i).__name__, 'Interpolation')
self.assertEqual(type(i).__qualname__, 'Interpolation')
self.assertEqual(type(i).__module__, 'string.templatelib')
def test_final_types(self):
with self.assertRaisesRegex(TypeError, 'is not an acceptable base type'):
class Sub(Template): ...
with self.assertRaisesRegex(TypeError, 'is not an acceptable base type'):
class Sub(Interpolation): ...
def test_basic_creation(self):
# Simple t-string creation
t = t'Hello, world'
self.assertIsInstance(t, Template)
self.assertTStringEqual(t, ('Hello, world',), ())
self.assertEqual(fstring(t), 'Hello, world')
# Empty t-string
t = t''
self.assertTStringEqual(t, ('',), ())
self.assertEqual(fstring(t), '')
# Multi-line t-string
t = t"""Hello,
world"""
self.assertEqual(t.strings, ('Hello,\nworld',))
self.assertEqual(len(t.interpolations), 0)
self.assertEqual(fstring(t), 'Hello,\nworld')
def test_interpolation_creation(self):
i = Interpolation('Maria', 'name', 'a', 'fmt')
self.assertInterpolationEqual(i, ('Maria', 'name', 'a', 'fmt'))
i = Interpolation('Maria', 'name', 'a')
self.assertInterpolationEqual(i, ('Maria', 'name', 'a'))
i = Interpolation('Maria', 'name')
self.assertInterpolationEqual(i, ('Maria', 'name'))
i = Interpolation('Maria')
self.assertInterpolationEqual(i, ('Maria',))
def test_creation_interleaving(self):
# Should add strings on either side
t = Template(Interpolation('Maria', 'name', None, ''))
self.assertTStringEqual(t, ('', ''), [('Maria', 'name')])
self.assertEqual(fstring(t), 'Maria')
# Should prepend empty string
t = Template(Interpolation('Maria', 'name', None, ''), ' is my name')
self.assertTStringEqual(t, ('', ' is my name'), [('Maria', 'name')])
self.assertEqual(fstring(t), 'Maria is my name')
# Should append empty string
t = Template('Hello, ', Interpolation('Maria', 'name', None, ''))
self.assertTStringEqual(t, ('Hello, ', ''), [('Maria', 'name')])
self.assertEqual(fstring(t), 'Hello, Maria')
# Should concatenate strings
t = Template('Hello', ', ', Interpolation('Maria', 'name', None, ''),
'!')
self.assertTStringEqual(t, ('Hello, ', '!'), [('Maria', 'name')])
self.assertEqual(fstring(t), 'Hello, Maria!')
# Should add strings on either side and in between
t = Template(Interpolation('Maria', 'name', None, ''),
Interpolation('Python', 'language', None, ''))
self.assertTStringEqual(
t, ('', '', ''), [('Maria', 'name'), ('Python', 'language')]
)
self.assertEqual(fstring(t), 'MariaPython')
def test_template_values(self):
t = t'Hello, world'
self.assertEqual(t.values, ())
name = "Lys"
t = t'Hello, {name}'
self.assertEqual(t.values, ("Lys",))
country = "GR"
age = 0
t = t'Hello, {name}, {age} from {country}'
self.assertEqual(t.values, ("Lys", 0, "GR"))
def test_pickle_template(self):
user = 'test'
for template in (
t'',
t"No values",
t'With inter {user}',
t'With ! {user!r}',
t'With format {1 / 0.3:.2f}',
Template(),
Template('a'),
Template(Interpolation('Nikita', 'name', None, '')),
Template('a', Interpolation('Nikita', 'name', 'r', '')),
):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(proto=proto, template=template):
pickled = pickle.dumps(template, protocol=proto)
unpickled = pickle.loads(pickled)
self.assertEqual(unpickled.values, template.values)
self.assertEqual(fstring(unpickled), fstring(template))
def test_pickle_interpolation(self):
for interpolation in (
Interpolation('Nikita', 'name', None, ''),
Interpolation('Nikita', 'name', 'r', ''),
Interpolation(1/3, 'x', None, '.2f'),
):
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
with self.subTest(proto=proto, interpolation=interpolation):
pickled = pickle.dumps(interpolation, protocol=proto)
unpickled = pickle.loads(pickled)
self.assertEqual(unpickled.value, interpolation.value)
self.assertEqual(unpickled.expression, interpolation.expression)
self.assertEqual(unpickled.conversion, interpolation.conversion)
self.assertEqual(unpickled.format_spec, interpolation.format_spec)
class TemplateIterTests(unittest.TestCase):
def test_abc(self):
self.assertIsInstance(iter(t''), Iterable)
self.assertIsInstance(iter(t''), Iterator)
def test_final(self):
TemplateIter = type(iter(t''))
with self.assertRaisesRegex(TypeError, 'is not an acceptable base type'):
class Sub(TemplateIter): ...
def test_iter(self):
x = 1
res = list(iter(t'abc {x} yz'))
self.assertEqual(res[0], 'abc ')
self.assertIsInstance(res[1], Interpolation)
self.assertEqual(res[1].value, 1)
self.assertEqual(res[1].expression, 'x')
self.assertEqual(res[1].conversion, None)
self.assertEqual(res[1].format_spec, '')
self.assertEqual(res[2], ' yz')
def test_exhausted(self):
# See https://github.com/python/cpython/issues/134119.
template_iter = iter(t"{1}")
self.assertIsInstance(next(template_iter), Interpolation)
self.assertRaises(StopIteration, next, template_iter)
self.assertRaises(StopIteration, next, template_iter)
class TestFunctions(unittest.TestCase):
def test_convert(self):
from fractions import Fraction
for obj in ('Café', None, 3.14, Fraction(1, 2)):
with self.subTest(f'{obj=}'):
self.assertEqual(convert(obj, None), obj)
self.assertEqual(convert(obj, 's'), str(obj))
self.assertEqual(convert(obj, 'r'), repr(obj))
self.assertEqual(convert(obj, 'a'), ascii(obj))
# Invalid conversion specifier
with self.assertRaises(ValueError):
convert(obj, 'z')
with self.assertRaises(ValueError):
convert(obj, 1)
with self.assertRaises(ValueError):
convert(obj, object())
if __name__ == '__main__':
unittest.main()
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