Fix jinja2 support in Python 3

Closes #294

cacheops/jinja2.py

@@ -19,7 +19,7 @@ def parse(self, parser):
         tag_name = parser.stream.current.value
         tag_location = '%s:%s' % (parser.name, lineno)
 
-        parser.stream.next()
+        next(parser.stream)
         args, kwargs = self.parse_args(parser)
         args = [nodes.Const(tag_name), nodes.Const(tag_location)] + args
 

requirements-test.txt

@@ -3,3 +3,4 @@ redis>=2.9.1
 funcy>=1.8,<2.0
 six>=1.4.0
 before_after==1.0.0
+jinja2>=2.10

tests/tests.py

@@ -428,6 +428,12 @@ def my_cached(context):
         self.assertRendersTo(t, {'inc': inc, 'flag': True}, '.1.1')
         self.assertRendersTo(t, {'inc': inc, 'flag': False}, '.2.3')
 
+    def test_jinja2(self):
+        from jinja2 import Environment
+        env = Environment(extensions=['cacheops.jinja2.cache'])
+        t = env.from_string('Hello, {% cached %}{{ name }}{% endcached %}')
+        t.render(name='Alex')
+
 
 class IssueTests(BaseTestCase):
     fixtures = ['basic']

tox.ini

@@ -37,6 +37,7 @@ deps =
     gdal=={env:GDAL_VERSION:2.1}
     pypy: psycopg2cffi>=2.7.6
     before_after==1.0.0
+    jinja2>=2.10
 commands =
     ./run_tests.py []
     env CACHEOPS_PREFIX=1 ./run_tests.py []