Ok. I've reached a nice little conclusion here. Time to go to bed, but before that I thought I'd share the results (-;
I can now read a yaml file which natively produces a dict tree and convert it into an object tree with attribute read/write access, dump that back into a readable yaml string, and then expand references within that using cheetah in a very nifty self-referential way.* (see: http://pyyaml.org/wiki/PyYAML) and cheetah templates (http:// www.cheetahtemplate.org/) Enjoy! AK <code below> from Cheetah.Template import Template from pprint import pprint import yaml class Object(dict): def __getattr__(self, name): if name in self: return self[name] #~ if name in self.__dict__: return getattr(self, name) def __setattr__(self, name, value): self[name] = value def getTree(tree, to_dict=False): _tree = Object() if not to_dict else dict() def recurse(targetDict, sourceDict): for key, value in sourceDict.items(): if isinstance(value, dict): value = Object(value) if not to_dict else dict(value) new_target = targetDict.setdefault(key, value) recurse(new_target, value) else: targetDict[key] = value recurse(_tree, tree) return _tree config = ''' app: name: appname copyright: me.org 2007 dir: src: /src/$app.name ''' # from yml dict tree to obj tree root = getTree(yaml.load(config)) print root print assert root.app.name == root.app['name'] root.app.name = "the_monster" # from obj tree to dict tree root = getTree(root, to_dict=True) # from dict tree to yaml string s = yaml.dump(root) print s # use cheetah templates to expand references print str(Template(s, searchList=[root])) -- http://mail.python.org/mailman/listinfo/python-list
