1 files changed, 24 insertions, 0 deletions
diff --git a/rest_framework/urlpatterns.py b/rest_framework/urlpatterns.py
new file mode 100644
index 00000000..7d09651a
--- /dev/null
+++ b/rest_framework/urlpatterns.py
@@ -0,0 +1,24 @@
+from django.conf.urls.defaults import url
+from rest_framework.settings import api_settings
+
+
+def format_suffix_patterns(urlpatterns, suffix_required=False, suffix_kwarg=None):
+    """
+    Supplement existing urlpatterns with corrosponding patterns that also
+    include a '.format' suffix.  Retains urlpattern ordering.
+    """
+    suffix_kwarg = suffix_kwarg or api_settings.FORMAT_SUFFIX_KWARG
+    suffix_pattern = '.(?P<%s>[a-z]+)$' % suffix_kwarg
+
+    ret = []
+    for urlpattern in urlpatterns:
+        # Form our complementing '.format' urlpattern
+        regex = urlpattern.regex.pattern.rstrip('$') + suffix_pattern
+        view = urlpattern._callback or urlpattern._callback_str
+        kwargs = urlpattern.default_args
+        name = urlpattern.name
+        # Add in both the existing and the new urlpattern
+        if not suffix_required:
+            ret.append(urlpattern)
+        ret.append(url(regex, view, kwargs, name))
+    return ret