+class SignatureIter(object):
+ def __init__(self, string):
+ object.__init__(self)
+ self.remaining = string
+
+ def next(self):
+ if self.remaining == '':
+ raise StopIteration
+
+ signature = self.remaining
+ block_depth = 0
+ block_type = None
+ end = len(signature)
+
+ for marker in range(0, end):
+ cur_sig = ord(signature[marker])
+
+ if cur_sig == TYPE_ARRAY:
+ pass
+ elif cur_sig == DICT_ENTRY_BEGIN or cur_sig == STRUCT_BEGIN:
+ if block_type == None:
+ block_type = cur_sig
+
+ if block_type == cur_sig:
+ block_depth = block_depth + 1
+
+ elif cur_sig == DICT_ENTRY_END:
+ if block_type == DICT_ENTRY_BEGIN:
+ block_depth = block_depth - 1
+
+ if block_depth == 0:
+ end = marker
+ break
+
+ elif cur_sig == STRUCT_END:
+ if block_type == STRUCT_BEGIN:
+ block_depth = block_depth - 1
+
+ if block_depth == 0:
+ end = marker
+ break
+
+ else:
+ if block_depth == 0:
+ end = marker
+ break
+
+ end = end + 1
+ self.remaining = signature[end:]
+ return Signature(signature[0:end])
+