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# -*- coding: utf-8 -*-
"Representation of the reference value of a function."
# Copyright (C) 2008-2016 Martin Sandve Alnæs
#
# This file is part of UFL (https://www.fenicsproject.org)
#
# SPDX-License-Identifier: LGPL-3.0-or-later
from ufl.core.ufl_type import ufl_type
from ufl.core.operator import Operator
from ufl.core.terminal import FormArgument
from ufl.log import error
@ufl_type(num_ops=1,
is_index_free=True,
is_terminal_modifier=True,
is_in_reference_frame=True)
class ReferenceValue(Operator):
"Representation of the reference cell value of a form argument."
__slots__ = ()
def __init__(self, f):
if not isinstance(f, FormArgument):
error("Can only take reference value of form arguments.")
Operator.__init__(self, (f,))
@property
def ufl_shape(self):
return self.ufl_operands[0].ufl_element().reference_value_shape()
def evaluate(self, x, mapping, component, index_values, derivatives=()):
"Get child from mapping and return the component asked for."
error("Evaluate not implemented.")
def __str__(self):
return "reference_value(%s)" % self.ufl_operands[0]
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