1 files changed, 46 insertions, 0 deletions
diff --git a/intern/python/modules/mcf/utils/walkerable.py b/intern/python/modules/mcf/utils/walkerable.py
new file mode 100644
index 00000000000..e4c18302097
--- /dev/null
+++ b/intern/python/modules/mcf/utils/walkerable.py
@@ -0,0 +1,46 @@
+'''
+Really simplistic walker-processable hierobjects, doesn't
+have parent attributes, every element has an __attrDict__
+item and a childlist.  This is different from the mechanisms
+we'll want to use for multi-tree systems, but it's fairly
+close.  Should be fairly simply worked with.
+'''
+class WalkerAble:
+	'''
+	Simple hierarchic objects with the following elements
+	
+	__attrDict__ -- app-specific attributes
+	__childlist__ -- childen of this node
+	__gi__ -- "type" or Generic Indicator of this node
+	__childlist__append__ -- as you'd expect, method on childlist to add an element
+	'''
+	def __init__(self, childlist=None, attrDict=None, gi=None):
+		self.__dict__['__attrDict__'] = attrDict or {}
+		self.__dict__['__childlist__'] = childlist or []
+		self.__dict__['__gi__'] = gi or ''
+		self.__dict__['__childlist__append__'] = self.__childlist__.append
+
+	def __getattr__(self, attrName):
+		'''
+		Note: you can store attributes with the same names as
+		the reserved names, but to get them back, you'll need
+		to read it directly out of the attrDict
+		'''
+		if attrName != '__attrDict__':
+			try:
+				return self.__attrDict__[attrName]
+			except KeyError:
+				pass
+		raise AttributeError, attrName
+
+	def __setattr__(self, attrName, attrVal):
+		self.__attrDict__[attrName] = attrVal
+	def __setGI__(self, gi):
+		self.__dict__['__gi__'] = gi
+	def __repr__(self):
+		return '''<WalkerAble %(__gi__)s %(__attrDict__)s %(__childlist__)s>'''%self.__dict__
+
+	# copy functions
+#	def __getinitargs__(self):
+#		return (self.__childlist__, self.__attrDict__, self.__gi__)
+