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"""The standard `length` function extension."""
from collections.abc import Sized
from typing import Union
from jsonpath.filter import UNDEFINED
from jsonpath.filter import _Undefined
from jsonpath.function_extensions import ExpressionType
from jsonpath.function_extensions import FilterFunction
class Length(FilterFunction):
"""A type-aware implementation of the standard `length` function."""
arg_types = [ExpressionType.VALUE]
return_type = ExpressionType.VALUE
def __call__(self, obj: Sized) -> Union[int, _Undefined]:
"""Return an object's length.
If the object does not have a length, the special _Nothing_ value is
returned.
"""
try:
return len(obj)
except TypeError:
return UNDEFINED
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