27 lines
1.1 KiB
Python
27 lines
1.1 KiB
Python
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# Safely load fast C Yaml loader/dumper if they are available
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try:
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from yaml import CSafeLoader as Loader
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except ImportError:
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from yaml import SafeLoader as Loader # type: ignore[assignment, misc]
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try:
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from yaml import CSafeDumper as Dumper
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except ImportError:
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from yaml import SafeDumper as Dumper # type: ignore[assignment, misc]
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YamlDumper = Dumper
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# A custom loader for YAML that errors on duplicate keys.
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# This doesn't happen by default: see https://github.com/yaml/pyyaml/issues/165
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class YamlLoader(Loader):
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def construct_mapping(self, node, deep=False): # type: ignore[no-untyped-def]
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mapping = []
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for key_node, value_node in node.value:
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key = self.construct_object(key_node, deep=deep) # type: ignore[no-untyped-call]
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assert (
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key not in mapping
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), f"Found a duplicate key in the yaml. key={key}, line={node.start_mark.line}"
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mapping.append(key)
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mapping = super().construct_mapping(node, deep=deep) # type: ignore[no-untyped-call]
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return mapping
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