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# Use CSafeFile if available
from typing import TYPE_CHECKING
from typing import Any
from typing import Dict
from typing import Iterable
from typing import Tuple
if TYPE_CHECKING:
from yaml import SafeLoader
else:
try:
from yaml import CSafeLoader as SafeLoader
except ImportError:
from yaml import SafeLoader
__all__ = [
"SafeLoader",
]
class LimitedSafeLoader(type):
"""Meta YAML loader that skips the resolution of the specified YAML tags."""
def __new__(
cls,
name: str,
bases: Tuple[type, ...],
namespace: Dict[str, Any],
exclude_resolvers: Iterable[str],
) -> "LimitedSafeLoader":
exclude_resolvers = set(exclude_resolvers)
implicit_resolvers = {
key: [
(tag, regex)
for tag, regex in mappings
if tag not in exclude_resolvers
]
for key, mappings in SafeLoader.yaml_implicit_resolvers.items()
}
return super().__new__(
cls,
name,
(SafeLoader, *bases),
{**namespace, "yaml_implicit_resolvers": implicit_resolvers},
)
class JsonschemaSafeLoader(
metaclass=LimitedSafeLoader,
exclude_resolvers={"tag:yaml.org,2002:timestamp"},
):
"""A safe YAML loader that leaves timestamps as strings."""
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