Merge pull request #76 from herdigiorgi/decimal

add Decimal support

jsons/__init__.py

@@ -90,6 +90,7 @@
 from enum import Enum
 from typing import Union, List, Tuple, Iterable
 from uuid import UUID
+from decimal import Decimal
 from jsons._common_impl import NoneType
 from jsons._key_transformers import snakecase, camelcase, pascalcase, lispcase
 from jsons import (
@@ -150,6 +151,7 @@
 default_timedelta_serializer = serializers.default_timedelta_serializer
 default_primitive_serializer = serializers.default_primitive_serializer
 default_object_serializer = serializers.default_object_serializer
+default_decimal_serializer = serializers.default_decimal_serializer
 default_uuid_serializer = serializers.default_uuid_serializer
 
 default_list_deserializer = deserializers.default_list_deserializer
@@ -169,6 +171,7 @@
 default_iterable_deserializer = deserializers.default_iterable_deserializer
 default_object_deserializer = deserializers.default_object_deserializer
 default_uuid_deserializer = deserializers.default_uuid_deserializer
+default_decimal_deserializer = deserializers.default_decimal_deserializer
 default_complex_serializer = deserializers.default_complex_deserializer
 
 # Set the serializers:
@@ -184,6 +187,7 @@
 set_serializer(default_iterable_serializer, Iterable, False)
 set_serializer(default_object_serializer, object, False)
 set_serializer(default_uuid_serializer, UUID)
+set_serializer(default_decimal_serializer, Decimal)
 
 # Set the deserializers:
 set_deserializer(default_list_deserializer, (list, List))
@@ -202,4 +206,5 @@
 set_deserializer(default_iterable_deserializer, Iterable, False)
 set_deserializer(default_object_deserializer, object, False)
 set_deserializer(default_uuid_deserializer, UUID)
+set_deserializer(default_decimal_deserializer, Decimal)
 set_deserializer(default_complex_serializer, complex)

jsons/deserializers/__init__.py

@@ -28,6 +28,7 @@
     default_tuple_deserializer,
     default_namedtuple_deserializer
 )
+from jsons.deserializers.default_decimal import default_decimal_deserializer
 
 
 KEY_TRANSFORMER_SNAKECASE = snakecase

jsons/deserializers/default_decimal.py

@@ -0,0 +1,16 @@
+from typing import Optional, Union
+from decimal import Decimal
+
+
+def default_decimal_deserializer(obj: Union[str, float, int],
+                                 cls: Optional[type] = None,
+                                 **kwargs) -> Decimal:
+    """
+    Deserialize a Decimal. Expects a string representation of a number, or
+    the number itself as a float or int.
+    :param obj: the string float or int that is to be deserialized.
+    :param cls: not used.
+    :param kwargs: any keyword arguments.
+    :return: the deserialized obj.
+    """
+    return Decimal(obj)

jsons/serializers/__init__.py

@@ -17,6 +17,7 @@
 from jsons.serializers.default_primitive import default_primitive_serializer
 from jsons.serializers.default_tuple import default_tuple_serializer
 from jsons.serializers.default_uuid import default_uuid_serializer
+from jsons.serializers.default_decimal import default_decimal_serializer
 
 
 KEY_TRANSFORMER_SNAKECASE = snakecase

jsons/serializers/default_decimal.py

@@ -0,0 +1,11 @@
+from decimal import Decimal
+
+
+def default_decimal_serializer(obj: Decimal, **kwargs) -> str:
+    """
+    Serialize a Decimal.
+    :param obj: an instance of a Decimal.
+    :param kwargs: any keyword arguments.
+    :return: ``obj`` serialized as a string.
+    """
+    return str(obj)

tests/test_decimal.py

@@ -0,0 +1,15 @@
+from decimal import Decimal
+from unittest import TestCase
+import jsons
+
+
+class TestDecimal(TestCase):
+    def test_dump_decimal(self):
+        self.assertEqual('12.345', jsons.dump(Decimal('12.345')))
+        self.assertEqual('2.5', jsons.dump(Decimal(2.5)))
+        self.assertEqual('25', jsons.dump(Decimal(25)))
+
+    def test_load_decimal(self):
+        self.assertEqual(Decimal('12.345'), jsons.load('12.345', Decimal))
+        self.assertEqual(Decimal(2.5), jsons.load(2.5, Decimal))
+        self.assertEqual(Decimal(25), jsons.load(25, Decimal))