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import decimal
from unittest import TestCase
from io import StringIO
from contextlib import contextmanager
import json
import json.decoder
import json.scanner
from collections import OrderedDict
@contextmanager
def use_python_scanner():
py_scanner = json.scanner.py_make_scanner
old_scanner = json.decoder.make_scanner
json.decoder.make_scanner = py_scanner
try:
yield
finally:
json.decoder.make_scanner = old_scanner
class TestDecode(TestCase):
def test_decimal(self):
rval = json.loads('1.1', parse_float=decimal.Decimal)
self.assertTrue(isinstance(rval, decimal.Decimal))
self.assertEqual(rval, decimal.Decimal('1.1'))
def test_float(self):
rval = json.loads('1', parse_int=float)
self.assertTrue(isinstance(rval, float))
self.assertEqual(rval, 1.0)
def test_empty_objects(self):
self.assertEqual(json.loads('{}'), {})
self.assertEqual(json.loads('[]'), [])
self.assertEqual(json.loads('""'), "")
def test_object_pairs_hook(self):
s = '{"xkd":1, "kcw":2, "art":3, "hxm":4, "qrt":5, "pad":6, "hoy":7}'
p = [("xkd", 1), ("kcw", 2), ("art", 3), ("hxm", 4),
("qrt", 5), ("pad", 6), ("hoy", 7)]
self.assertEqual(json.loads(s), eval(s))
self.assertEqual(json.loads(s, object_pairs_hook = lambda x: x), p)
self.assertEqual(json.load(StringIO(s),
object_pairs_hook=lambda x: x), p)
od = json.loads(s, object_pairs_hook = OrderedDict)
self.assertEqual(od, OrderedDict(p))
self.assertEqual(type(od), OrderedDict)
# the object_pairs_hook takes priority over the object_hook
self.assertEqual(json.loads(s,
object_pairs_hook = OrderedDict,
object_hook = lambda x: None),
OrderedDict(p))
def test_decoder_optimizations(self):
# Several optimizations were made that skip over calls to
# the whitespace regex, so this test is designed to try and
# exercise the uncommon cases. The array cases are already covered.
rval = json.loads('{ "key" : "value" , "k":"v" }')
self.assertEqual(rval, {"key":"value", "k":"v"})
def check_keys_reuse(self, source, loads):
rval = loads(source)
(a, b), (c, d) = sorted(rval[0]), sorted(rval[1])
self.assertIs(a, c)
self.assertIs(b, d)
def test_keys_reuse(self):
s = '[{"a_key": 1, "b_\xe9": 2}, {"a_key": 3, "b_\xe9": 4}]'
self.check_keys_reuse(s, json.loads)
# Disabled: the pure Python version of json simply doesn't work
with use_python_scanner():
self.check_keys_reuse(s, json.decoder.JSONDecoder().decode)
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