Support negative numbers for int path components (Fixes #137)

src/microdot.py

@@ -736,7 +736,7 @@ class URLPattern():
                 if type_ == 'string':
                     pattern = '[^/]+'
                 elif type_ == 'int':
-                    pattern = '\\d+'
+                    pattern = '-?\\d+'
                 elif type_ == 'path':
                     pattern = '.+'
                 elif type_.startswith('re:'):

tests/test_url_pattern.py

@@ -56,10 +56,12 @@ class TestURLPattern(unittest.TestCase):
 
         p = URLPattern('/users/<int:id>/<int:id2>/')
         self.assertEqual(p.match('/users/123/456/'), {'id': 123, 'id2': 456})
+        self.assertEqual(p.match('/users/123/-456/'), {'id': 123, 'id2': -456})
         self.assertIsNone(p.match('/users/'))
-        self.assertIsNone(p.match('/users/123/456'))
+        self.assertIsNone(p.match('/users/123/-456'))
         self.assertIsNone(p.match('/users/123/abc/'))
-        self.assertIsNone(p.match('/users/123/456/abc'))
+        self.assertIsNone(p.match('/users/123/-456/abc'))
+        self.assertIsNone(p.match('/users/--123/456/'))
 
     def test_path_argument(self):
         p = URLPattern('/users/<path:path>')