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| # Original code by Eric Naeseth (enaeseth on GitHub) | |
| # https://gist.github.com/enaeseth/844388 | |
| import yaml | |
| import yaml.constructor | |
| from collections import OrderedDict | |
| class OrderedDictYAMLLoader(yaml.Loader): | |
| """ | |
| A YAML loader that loads mappings into ordered dictionaries. | |
| """ | |
| def __init__(self, *args, **kwargs): | |
| yaml.Loader.__init__(self, *args, **kwargs) | |
| self.add_constructor(u'tag:yaml.org,2002:map', | |
| type(self).construct_yaml_map) | |
| self.add_constructor(u'tag:yaml.org,2002:omap', | |
| type(self).construct_yaml_map) | |
| def construct_yaml_map(self, node): | |
| data = OrderedDict() | |
| yield data | |
| value = self.construct_mapping(node) | |
| data.update(value) | |
| def construct_mapping(self, node, deep=False): | |
| if isinstance(node, yaml.MappingNode): | |
| self.flatten_mapping(node) | |
| else: | |
| raise yaml.constructor.ConstructorError(None, None, | |
| 'expected a mapping node, but found %s' | |
| % node.id, node.start_mark) | |
| mapping = OrderedDict() | |
| for key_node, value_node in node.value: | |
| key = self.construct_object(key_node, deep=deep) | |
| try: | |
| hash(key) | |
| except TypeError as exc: | |
| raise yaml.constructor.ConstructorError( | |
| 'while constructing a mapping', node.start_mark, | |
| 'found unacceptable key (%s)' % exc, key_node.start_mark) | |
| value = self.construct_object(value_node, deep=deep) | |
| mapping[key] = value | |
| return mapping |
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