Encode None as atom none

CHANGES

@@ -1,5 +1,7 @@
 Version 0.5 (XXXX-XX-XX)
 
+    - None ecnoded as atom none (Dmitry Vasiliev)
+
     - Encode dict as a proplist (ordered by Python sort order, may be used as
       orddict if keys are all the same type) (Bob Ippolito)
 

TODO

@@ -1,3 +1,3 @@
-- Add new datatypes (None, references?)
+- Add new datatypes (references?)
 
 - Add version keyword to encode() function

src/erlport/erlterms.py

@@ -169,6 +169,8 @@ def decode_term(string):
             return True, tail
         elif name == "false":
             return False, tail
+        elif name == "none":
+            return None, tail
         return Atom(name), tail
     elif tag == 104 or tag == 105:
         # SMALL_TUPLE_EXT, LARGE_TUPLE_EXT
@@ -336,5 +338,7 @@ def encode_term(term,
         # encode dict as proplist, but will be orddict compatible if keys
         # are all of the same type.
         return encode_term(sorted(term.iteritems()))
+    elif term is None:
+        return pack(">BH", 100, 4) + "none"
 
     raise ValueError("unsupported data type: %s" % type(term))

src/erlport/tests/erlterms.txt

@@ -123,6 +123,11 @@ dict encoded as (Python) ordered proplists:
     >>> encode(dict(a=1,b=2,c=3)) == encode([('a', 1), ('b', 2), ('c', 3)])
     True
 
+None encoded as atom none:
+
+    >>> encode(None) == encode(Atom('none'))
+    True
+
 
 Decoding
 --------
@@ -254,3 +259,8 @@ Atoms true and false decoded as True and False:
     (True, '')
     >>> decode('\x83d\x00\x05false')
     (False, '')
+
+Atom none decoded as None:
+
+    >>> decode('\x83d\x00\x04none')
+    (None, '')