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"""The standard `value` function extension."""
from __future__ import annotations
from typing import TYPE_CHECKING
from jsonpath.filter import UNDEFINED
from jsonpath.function_extensions import ExpressionType
from jsonpath.function_extensions import FilterFunction
if TYPE_CHECKING:
from jsonpath.match import NodeList
class Value(FilterFunction):
"""A type-aware implementation of the standard `value` function."""
arg_types = [ExpressionType.NODES]
return_type = ExpressionType.VALUE
def __call__(self, nodes: NodeList) -> object:
"""Return the first node in a node list if it has only one item."""
if len(nodes) == 1:
return nodes[0].obj
return UNDEFINED
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