| import collections | |
| import yaml | |
| # Try to preserve order in the front matter. | |
| def dict_representer(dumper, data): | |
| return dumper.represent_dict(data.items()) | |
| def dict_constructor(loader, node): | |
| return collections.OrderedDict(loader.construct_pairs(node)) | |
| _mapping_tag = yaml.resolver.BaseResolver.DEFAULT_MAPPING_TAG | |
| yaml.Dumper.add_representer(collections.OrderedDict, dict_representer) | |
| yaml.Loader.add_constructor(_mapping_tag, dict_constructor) | |
| yaml.FullLoader.add_constructor(_mapping_tag, dict_constructor) | |
| # Represent null as blank. | |
| def none_representer(dumper, _): | |
| return dumper.represent_scalar('tag:yaml.org,2002:null', '') | |
| yaml.Dumper.add_representer(type(None), none_representer) |
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