text splitted into chunks,

[redakcja.git] / apps / wiki / helpers.py

diff --git a/apps/wiki/helpers.py b/apps/wiki/helpers.py
index 553b1e4..f072ef9 100644 (file)
--- a/apps/wiki/helpers.py
+++ b/apps/wiki/helpers.py
@@ -24,9 +24,8 @@ class JSONResponse(http.HttpResponse):
         # get rid of mimetype
         kwargs.pop('mimetype', None)
 
-        super(JSONResponse, self).__init__(
-            json.dumps(data, cls=ExtendedEncoder),
-            mimetype="application/json", **kwargs)
+        data = json.dumps(data, cls=ExtendedEncoder)
+        super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
 
 
 # return errors
@@ -59,3 +58,74 @@ def ajax_require_permission(permission):
             return view(request, *args, **kwargs)
         return authorized_view
     return decorator
+
+import collections
+
+def recursive_groupby(iterable):
+    """
+#    >>> recursive_groupby([1,2,3,4,5])
+#    [1, 2, 3, 4, 5]
+
+    >>> recursive_groupby([[1]])
+    [1]
+
+    >>> recursive_groupby([('a', 1),('a', 2), 3, ('b', 4), 5])
+    ['a', [1, 2], 3, 'b', [4], 5]
+
+    >>> recursive_groupby([('a', 'x', 1),('a', 'x', 2), ('a', 'x', 3)])
+    ['a', ['x', [1, 2, 3]]]
+
+    """
+
+    def _generator(iterator):
+        group = None
+        grouper = None
+
+        for item in iterator:
+            if not isinstance(item, collections.Sequence):
+                if grouper is not None:
+                    yield grouper
+                    if len(group):
+                        yield recursive_groupby(group)
+                    group = None
+                    grouper = None
+                yield item
+                continue
+            elif len(item) == 1:
+                if grouper is not None:
+                    yield grouper
+                    if len(group):
+                        yield recursive_groupby(group)
+                    group = None
+                    grouper = None
+                yield item[0]
+                continue
+            elif not len(item):
+                continue
+
+            if grouper is None:
+                group = [item[1:]]
+                grouper = item[0]
+                continue
+
+            if grouper != item[0]:
+                if grouper is not None:
+                    yield grouper
+                    if len(group):
+                        yield recursive_groupby(group)
+                    group = None
+                    grouper = None
+                group = [item[1:]]
+                grouper = item[0]
+                continue
+
+            group.append(item[1:])
+
+        if grouper is not None:
+            yield grouper
+            if len(group):
+                yield recursive_groupby(group)
+            group = None
+            grouper = None
+
+    return list(_generator(iterable))