Fea/logic operators

pyresult/result.py

@@ -1,14 +1,80 @@
 # -*- coding: utf-8 -*-
 '''Result pattern implementation'''
 
-import collections
+from collections import namedtuple
 from toolz import curry
 
 
 OK = 'Ok'
 ERROR = 'Error'
 
-Result = collections.namedtuple('Result', ('status', 'value'))
+
+class Result(namedtuple('Result', ('status', 'value'))):
+    '''Result'''
+    __slots__ = ()
+
+    def __and__(self, other):
+        '''Calculate the AND of two results.
+
+        :param other: Result e a
+        :returns: Result e a
+
+        >>> from pyresult import ok, error
+
+        >>> ok(1) & ok(2)
+        Result(status='Ok', value=[1, 2])
+
+        >>> ok(1) & error(2)
+        Result(status='Error', value=[2])
+
+        >>> error(1) & ok(2)
+        Result(status='Error', value=[1])
+
+        >>> error(1) & error(2)
+        Result(status='Error', value=[1, 2])
+
+        '''
+        cond = (is_ok(self), is_ok(other))
+
+        if cond == (True, True):
+            return ok([self.value, other.value])
+        elif cond == (True, False):
+            return error([other.value])
+        elif cond == (False, True):
+            return error([self.value])
+        elif cond == (False, False):  # pragma: no branch
+            return error([self.value, other.value])
+
+    def __or__(self, other):
+        '''Calculate the OR of two results.
+
+        :param other: Result e a
+        :returns: Result e a
+
+        >>> from pyresult import ok, error
+
+        >>> ok(1) | ok(2)
+        Result(status='Ok', value=[1, 2])
+
+        >>> ok(1) | error(2)
+        Result(status='Ok', value=[1])
+
+        >>> error(1) | ok(2)
+        Result(status='Ok', value=[2])
+
+        >>> error(1) | error(2)
+        Result(status='Error', value=[1, 2])
+        '''
+        cond = (is_ok(self), is_ok(other))
+
+        if cond == (True, True):
+            return ok([self.value, other.value])
+        elif cond == (True, False):
+            return ok([self.value])
+        elif cond == (False, True):
+            return ok([other.value])
+        elif cond == (False, False):  # pragma: no branch
+            return error([self.value, other.value])
 
 
 class ResultError(Exception):

setup.cfg

@@ -23,19 +23,22 @@ exclude = urls.py,runtests.py,conf.py
 ignore = E501,E402
 
 [tool:pytest]
-addopts = -vvl
-norecursedirs = .* requirements docs node_modules
+addopts = -vvl --doctest-glob='*.rst' --doctest-modules --ignore=setup.py
+norecursedirs = .* requirements node_modules
+doctest_optionflags = ALLOW_UNICODE ELLIPSIS
 
 [coverage:run]
 branch = true
 
 [coverage:report]
-omit = 
+omit =
+    *docs*
 	*site-packages*
 	*tests*
 	*.tox*
 	*conftest*
 	*virtuals*
 	*migrations*
+    *setup.py
 show_missing = True