Fixed #3993 -- Added some useful dictionary methods to SortedDict, plus an insert() method. Patch from Paul Collier.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6350 bcc190cf-cafb-0310-a4f2-bffc1f526a37

AUTHORS

@@ -83,6 +83,7 @@ answer newbie questions, and generally made Django that much better:
     Russell Cloran <russell@rucus.net>
     colin@owlfish.com
     crankycoder@gmail.com
+    Paul Collier <paul@paul-collier.com>
     Pete Crosier <pete.crosier@gmail.com>
     Matt Croydon <http://www.postneo.com/>
     flavio.curella@gmail.com

django/utils/datastructures.py

@@ -72,12 +72,23 @@ class SortedDict(dict):
     def items(self):
         return zip(self.keyOrder, self.values())
 
+    def iteritems(self):
+        for key in self.keyOrder:
+            yield key, dict.__getitem__(self, key)
+
     def keys(self):
         return self.keyOrder[:]
 
+    def iterkeys(self):
+        return iter(self.keyOrder)
+
     def values(self):
         return [dict.__getitem__(self, k) for k in self.keyOrder]
 
+    def itervalues(self):
+        for key in self.keyOrder:
+            yield dict.__getitem__(self, key)
+
     def update(self, dict):
         for k, v in dict.items():
             self.__setitem__(k, v)
@@ -91,6 +102,15 @@ class SortedDict(dict):
         "Returns the value of the item at the given zero-based index."
         return self[self.keyOrder[index]]
 
+    def insert(self, index, key, value):
+        "Inserts the key, value pair before the item with the given index."
+        if key in self.keyOrder:
+            n = self.keyOrder.index(key)
+            del self.keyOrder[n]
+            if n < index: index -= 1
+        self.keyOrder.insert(index, key)
+        dict.__setitem__(self, key, value)
+
     def copy(self):
         "Returns a copy of this object."
         # This way of initializing the copy means it works for subclasses, too.