Add Range type

Add a type which accepts "1-3" to produce a range. This can be used to
EG find a free port in a range or validate that a user input is
acceptable.

It should be possible to make a ListOpt(Range) which will accept
"1-3,5-6".

Change-Id: I9a2727522f25535a25c53ac89cd5e0096c87fef9
Co-Authored-By: Alexis Lee <lxsli@hpe.com>

1 files changed, 40 insertions, 0 deletions

diff --git a/oslo_config/tests/test_types.py b/oslo_config/tests/test_types.py
index b53817d..524aa94 100644
--- a/oslo_config/tests/test_types.py
+++ b/oslo_config/tests/test_types.py
@@ -16,6 +16,7 @@ import re
 import unittest
 
 from oslo_config import types
+from six.moves import range as compat_range
 
 
 class ConfigTypeTests(unittest.TestCase):
@@ -545,6 +546,45 @@ class ListTypeTests(TypeTestHelper, unittest.TestCase):
         self.assertFalse(types.List() == types.Integer())
 
 
+class RangeTypeTests(TypeTestHelper, unittest.TestCase):
+    type = types.Range()
+
+    def assertRange(self, s, r1, r2, step=1):
+        self.assertEqual(list(compat_range(r1, r2, step)),
+                         list(self.type_instance(s)))
+
+    def test_range(self):
+        self.assertRange('0-2', 0, 3)
+        self.assertRange('-2-0', -2, 1)
+        self.assertRange('2-0', 2, -1, -1)
+        self.assertRange('-3--1', -3, 0)
+        self.assertRange('-1--3', -1, -4, -1)
+        self.assertRange('-1', -1, 0)
+        self.assertInvalid('--1')
+        self.assertInvalid('4-')
+        self.assertInvalid('--')
+        self.assertInvalid('1.1-1.2')
+        self.assertInvalid('a-b')
+
+    def test_range_bounds(self):
+        self.type_instance = types.Range(1, 3)
+        self.assertRange('1-3', 1, 4)
+        self.assertRange('2-2', 2, 3)
+        self.assertRange('2', 2, 3)
+        self.assertInvalid('1-4')
+        self.assertInvalid('0-3')
+        self.assertInvalid('0-4')
+
+    def test_range_exclusive(self):
+        self.type_instance = types.Range(inclusive=False)
+        self.assertRange('0-2', 0, 2)
+        self.assertRange('-2-0', -2, 0)
+        self.assertRange('2-0', 2, 0, -1)
+        self.assertRange('-3--1', -3, -1)
+        self.assertRange('-1--3', -1, -3, -1)
+        self.assertRange('-1', -1, -1)
+
+
 class DictTypeTests(TypeTestHelper, unittest.TestCase):
     type = types.Dict()