mirror of
https://github.com/python/cpython
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194 lines
7.1 KiB
Python
194 lines
7.1 KiB
Python
import decimal
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import unittest.mock
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from io import StringIO
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from collections import OrderedDict
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from test.test_json import PyTest, CTest
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from test import support
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class TestDecode:
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def test_decimal(self):
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rval = self.loads('1.1', parse_float=decimal.Decimal)
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self.assertIsInstance(rval, decimal.Decimal)
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self.assertEqual(rval, decimal.Decimal('1.1'))
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def test_float(self):
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rval = self.loads('1', parse_int=float)
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self.assertIsInstance(rval, float)
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self.assertEqual(rval, 1.0)
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def test_nonascii_digits_rejected(self):
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# JSON specifies only ascii digits, see gh-125687
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for num in ["1\uff10", "0.\uff10", "0e\uff10"]:
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with self.assertRaises(self.JSONDecodeError):
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self.loads(num)
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def test_bytes(self):
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self.assertEqual(self.loads(b"1"), 1)
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def test_parse_constant(self):
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for constant, expected in [
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("Infinity", "INFINITY"),
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("-Infinity", "-INFINITY"),
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("NaN", "NAN"),
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]:
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self.assertEqual(
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self.loads(constant, parse_constant=str.upper), expected
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)
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def test_constant_invalid_case(self):
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for constant in [
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"nan", "NAN", "naN", "infinity", "INFINITY", "inFiniTy"
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]:
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with self.assertRaises(self.JSONDecodeError):
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self.loads(constant)
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def test_empty_objects(self):
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self.assertEqual(self.loads('{}'), {})
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self.assertEqual(self.loads('[]'), [])
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self.assertEqual(self.loads('""'), "")
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def test_object_hook(self):
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s = '{"a":{"b":{}}}'
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expected_result = {"a":{"b":{"x":1}, "x":1}, "x":1}
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expected_hook_arguments = [
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{}, {"b": {"x":1}}, {"a": {"b": {"x":1}, "x":1}}
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]
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hook_arguments = []
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def hook(x):
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hook_arguments.append(x)
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return {**x, "x":1}
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result = self.loads(s, object_hook=hook)
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self.assertEqual(result, expected_result)
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self.assertEqual(hook_arguments, expected_hook_arguments)
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def test_object_pairs_hook(self):
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s = '{"xkd":1, "kcw":2, "art":3, "hxm":4, "qrt":5, "pad":6, "hoy":7}'
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p = [("xkd", 1), ("kcw", 2), ("art", 3), ("hxm", 4),
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("qrt", 5), ("pad", 6), ("hoy", 7)]
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self.assertEqual(self.loads(s), eval(s))
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self.assertEqual(self.loads(s, object_pairs_hook=lambda x: x), p)
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self.assertEqual(self.json.load(StringIO(s),
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object_pairs_hook=lambda x: x), p)
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od = self.loads(s, object_pairs_hook=OrderedDict)
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self.assertEqual(od, OrderedDict(p))
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self.assertEqual(type(od), OrderedDict)
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# the object_pairs_hook takes priority over the object_hook
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self.assertEqual(self.loads(s, object_pairs_hook=OrderedDict,
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object_hook=lambda x: None),
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OrderedDict(p))
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# check that empty object literals work (see #17368)
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self.assertEqual(self.loads('{}', object_pairs_hook=OrderedDict),
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OrderedDict())
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self.assertEqual(self.loads('{"empty": {}}',
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object_pairs_hook=OrderedDict),
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OrderedDict([('empty', OrderedDict())]))
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def test_array_hook(self):
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s = '[1, 2, 3]'
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t = self.loads(s, array_hook=tuple)
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self.assertEqual(t, (1, 2, 3))
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self.assertEqual(type(t), tuple)
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# Nested array in inner structure with object_hook
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s = '{"xkd": [[1], [2], [3]]}'
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p = frozendict(xkd=((1,), (2,), (3,)))
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data = self.loads(s, object_hook=frozendict, array_hook=tuple)
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self.assertEqual(data, p)
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self.assertEqual(type(data), frozendict)
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self.assertEqual(type(data["xkd"]), tuple)
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for item in data["xkd"]:
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self.assertEqual(type(item), tuple)
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self.assertEqual(self.loads('[]', array_hook=tuple), ())
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def test_load_array_hook(self):
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# json.load must forward array_hook to loads
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fp = StringIO('[10, 20, 30]')
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result = self.json.load(fp, array_hook=tuple)
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self.assertEqual(result, (10, 20, 30))
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self.assertEqual(type(result), tuple)
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def test_decoder_optimizations(self):
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# Several optimizations were made that skip over calls to
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# the whitespace regex, so this test is designed to try and
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# exercise the uncommon cases. The array cases are already covered.
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rval = self.loads('{ "key" : "value" , "k":"v" }')
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self.assertEqual(rval, {"key":"value", "k":"v"})
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def check_keys_reuse(self, source, loads):
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rval = loads(source)
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(a, b), (c, d) = sorted(rval[0]), sorted(rval[1])
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self.assertIs(a, c)
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self.assertIs(b, d)
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def test_keys_reuse(self):
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s = '[{"a_key": 1, "b_\xe9": 2}, {"a_key": 3, "b_\xe9": 4}]'
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self.check_keys_reuse(s, self.loads)
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decoder = self.json.decoder.JSONDecoder()
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self.check_keys_reuse(s, decoder.decode)
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self.assertFalse(decoder.memo)
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def test_extra_data(self):
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s = '[1, 2, 3]5'
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msg = 'Extra data'
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self.assertRaisesRegex(self.JSONDecodeError, msg, self.loads, s)
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def test_invalid_escape(self):
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s = '["abc\\y"]'
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msg = 'escape'
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self.assertRaisesRegex(self.JSONDecodeError, msg, self.loads, s)
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def test_invalid_input_type(self):
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msg = 'the JSON object must be str'
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for value in [1, 3.14, [], {}, None]:
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self.assertRaisesRegex(TypeError, msg, self.loads, value)
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def test_string_with_utf8_bom(self):
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# see #18958
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bom_json = "[1,2,3]".encode('utf-8-sig').decode('utf-8')
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with self.assertRaises(self.JSONDecodeError) as cm:
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self.loads(bom_json)
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self.assertIn('BOM', str(cm.exception))
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with self.assertRaises(self.JSONDecodeError) as cm:
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self.json.load(StringIO(bom_json))
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self.assertIn('BOM', str(cm.exception))
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# make sure that the BOM is not detected in the middle of a string
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bom = ''.encode('utf-8-sig').decode('utf-8')
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bom_in_str = f'"{bom}"'
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self.assertEqual(self.loads(bom_in_str), '\ufeff')
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self.assertEqual(self.json.load(StringIO(bom_in_str)), '\ufeff')
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def test_negative_index(self):
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d = self.json.JSONDecoder()
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self.assertRaises(ValueError, d.raw_decode, 'a'*42, -50000)
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def test_unterminated_string(self):
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d = self.json.JSONDecoder()
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self.assertRaises(self.JSONDecodeError, d.raw_decode, '"\\')
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def test_limit_int(self):
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maxdigits = 5000
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with support.adjust_int_max_str_digits(maxdigits):
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self.loads('1' * maxdigits)
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with self.assertRaises(ValueError):
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self.loads('1' * (maxdigits + 1))
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def test_explicit_cls_skips_json_decoder_default(self):
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class CustomDecoder:
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pass
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with unittest.mock.patch.object(
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CustomDecoder, 'decode', create=True) as mock_decode:
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self.loads('{}', cls=CustomDecoder)
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mock_decode.assert_called_once()
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class TestPyDecode(TestDecode, PyTest): pass
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class TestCDecode(TestDecode, CTest): pass
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