| # Copyright 2014 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| """YAML utilities.""" |
| |
| import yaml |
| |
| |
| class BaseYAMLTagMetaclass(type): |
| """Base metaclass for creating YAML tags.""" |
| YAML_TAG = None |
| |
| @classmethod |
| def YAMLConstructor(mcs, loader, node): |
| raise NotImplementedError |
| |
| @classmethod |
| def YAMLRepresenter(mcs, dumper, data): |
| raise NotImplementedError |
| |
| def __init__(cls, name, bases, attrs): |
| yaml.add_constructor(cls.YAML_TAG, cls.YAMLConstructor) |
| yaml.add_representer(cls, cls.YAMLRepresenter) |
| super(BaseYAMLTagMetaclass, cls).__init__(name, bases, attrs) |
