Add the is_nan FLOAT attribute

Author: zeroSteiner

docs/source/attributes.rst

@@ -51,22 +51,14 @@ The following attributes are builtin to the default :py:class:`~.Context` object
 +-------------------+-------------------------------------+
 | ``zone_name``     | :py:attr:`~.DataType.STRING`        |
 +-------------------+-------------------------------------+
-| :py:attr:`~.DataType.TIMEDELTA` **Attributes**          |
-+-------------------+-------------------------------------+
-| ``days``          | :py:attr:`~.DataType.FLOAT`         |
-+-------------------+-------------------------------------+
-| ``seconds``       | :py:attr:`~.DataType.FLOAT`         |
-+-------------------+-------------------------------------+
-| ``microseconds``  | :py:attr:`~.DataType.FLOAT`         |
-+-------------------+-------------------------------------+
-| ``total_seconds`` | :py:attr:`~.DataType.FLOAT`         |
-+-------------------+-------------------------------------+
 | :py:attr:`~.DataType.FLOAT`   **Attributes** :sup:`1`   |
 +-------------------+-------------------------------------+
 | ``ceiling``       | :py:attr:`~.DataType.FLOAT`         |
 +-------------------+-------------------------------------+
 | ``floor``         | :py:attr:`~.DataType.FLOAT`         |
 +-------------------+-------------------------------------+
+| ``is_nan``        | :py:attr:`~.DataType.BOOLEAN`       |
++-------------------+-------------------------------------+
 | ``to_flt``        | :py:attr:`~.DataType.FLOAT`         |
 +-------------------+-------------------------------------+
 | ``to_str``        | :py:attr:`~.DataType.STRING`        |
@@ -111,6 +103,16 @@ The following attributes are builtin to the default :py:class:`~.Context` object
 +-------------------+-------------------------------------+
 | ``length``        | :py:attr:`~.DataType.FLOAT`         |
 +-------------------+-------------------------------------+
+| :py:attr:`~.DataType.TIMEDELTA` **Attributes**          |
++-------------------+-------------------------------------+
+| ``days``          | :py:attr:`~.DataType.FLOAT`         |
++-------------------+-------------------------------------+
+| ``seconds``       | :py:attr:`~.DataType.FLOAT`         |
++-------------------+-------------------------------------+
+| ``microseconds``  | :py:attr:`~.DataType.FLOAT`         |
++-------------------+-------------------------------------+
+| ``total_seconds`` | :py:attr:`~.DataType.FLOAT`         |
++-------------------+-------------------------------------+
 
 FLOAT Attributes :sup:`1`
 ^^^^^^^^^^^^^^^^^^^^^^^^^

docs/source/change_log.rst

@@ -7,6 +7,13 @@ this list is curated by the development team for note worthy changes.
 Version 4.x.x
 -------------
 
+Version 4.3.0
+^^^^^^^^^^^^^
+
+Released :release:`4.3.0` on January 15th, 2024
+
+* Added the ``is_nan`` attribute for ``FLOAT`` values
+
 Version 4.2.0
 ^^^^^^^^^^^^^
 

lib/rule_engine/engine.py

@@ -241,22 +241,6 @@ def datetime_year(self, value):
 	def datetime_zone_name(self, value):
 		return value.tzname()
 
-	@attribute('days', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
-	def timedelta_days(self, value):
-		return value.days
-
-	@attribute('seconds', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
-	def timedelta_seconds(self, value):
-		return value.seconds
-
-	@attribute('microseconds', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
-	def timedelta_microseconds(self, value):
-		return value.microseconds
-
-	@attribute('total_seconds', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
-	def timedelta_total_seconds(self, value):
-		return value.total_seconds()
-
 	@attribute('ceiling', ast.DataType.FLOAT, result_type=ast.DataType.FLOAT)
 	def float_ceiling(self, value):
 		return _float_op(value, math.ceil)
@@ -265,6 +249,10 @@ def float_ceiling(self, value):
 	def float_floor(self, value):
 		return _float_op(value, math.floor)
 
+	@attribute('is_nan', ast.DataType.FLOAT, result_type=ast.DataType.BOOLEAN)
+	def float_is_nan(self, value):
+		return math.isnan(value)
+
 	@attribute('to_flt', ast.DataType.FLOAT, result_type=ast.DataType.FLOAT)
 	def float_to_flt(self, value):
 		return value
@@ -312,6 +300,22 @@ def string_to_int(self, value):
 			raise errors.EvaluationError('data type mismatch (not an integer number)')
 		return value
 
+	@attribute('days', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
+	def timedelta_days(self, value):
+		return value.days
+
+	@attribute('seconds', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
+	def timedelta_seconds(self, value):
+		return value.seconds
+
+	@attribute('microseconds', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
+	def timedelta_microseconds(self, value):
+		return value.microseconds
+
+	@attribute('total_seconds', ast.DataType.TIMEDELTA, result_type=ast.DataType.FLOAT)
+	def timedelta_total_seconds(self, value):
+		return value.total_seconds()
+
 	@attribute('is_empty', ast.DataType.ARRAY, ast.DataType.STRING, ast.DataType.MAPPING, ast.DataType.SET, result_type=ast.DataType.BOOLEAN)
 	def value_is_empty(self, value):
 		return len(value) == 0

tests/ast/expression/attribute.py

@@ -144,6 +144,7 @@ def test_ast_expression_float_attributes(self):
 		attributes = {
 			'ceiling': decimal.Decimal('4'),
 			'floor': decimal.Decimal('3'),
+			'is_nan': False,
 			'to_flt': flt,
 			'to_str': '3.14159'
 		}