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