/usr/lib/python2.7/dist-packages/ufl/argument.py is in python-ufl 1.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | """This module defines the class Argument and a number of related
classes (functions), including TestFunction and TrialFunction."""
# Copyright (C) 2008-2014 Martin Sandve Alnes
#
# This file is part of UFL.
#
# UFL is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# UFL is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with UFL. If not, see <http://www.gnu.org/licenses/>.
#
# Modified by Anders Logg, 2008-2009.
#
# First added: 2008-03-14
# Last changed: 2011-10-20
from ufl.log import deprecate
from ufl.assertions import ufl_assert
from ufl.terminal import FormArgument
from ufl.split_functions import split
from ufl.finiteelement import FiniteElementBase
# --- Class representing an argument (basis function) in a form ---
class Argument(FormArgument):
"""UFL value: Representation of an argument to a form."""
__slots__ = ("_element", "_number", "_part", "_repr")
def __init__(self, element, number, part=None):
FormArgument.__init__(self)
ufl_assert(isinstance(element, FiniteElementBase),
"Expecting an element, not %s" % (element,))
ufl_assert(isinstance(number, int),
"Expecting an int for number, not %s" % (number,))
ufl_assert(part is None or isinstance(part, int),
"Expecting None or an int for part, not %s" % (part,))
self._element = element
self._number = number
self._part = part
self._repr = "Argument(%r, %r, %r)" % (self._element, self._number, self._part)
def reconstruct(self, element=None, number=None, part=None):
if element is None or (element == self._element): # TODO: Is the == here a workaround for some bug?
element = self._element
if number is None:
number = self._number
if part is None:
part = self._part
if number == self._number and part == self._part and element is self._element:
return self
ufl_assert(element.value_shape() == self._element.value_shape(),
"Cannot reconstruct an Argument with a different value shape.")
return Argument(element, number, part)
def element(self):
return self._element
def number(self):
return self._number
def part(self):
return self._part
def count(self):
deprecate("The count of an Argument has been replaced with number() and part().")
ufl_assert(self.part() is None, "Deprecation transition for count() will not work with parts.")
return self.number() # I think this will work ok in most cases during the deprecation transition
def shape(self):
return self._element.value_shape()
def is_cellwise_constant(self):
"Return whether this expression is spatially constant over each cell."
# TODO: Should in principle do like with Coefficient,
# but that may currently simplify away some arguments
# we want to keep, or? See issue#13.
# When we can annotate zero with arguments, we can change this.
return False
def domains(self):
"Return tuple of domains related to this terminal object."
return self._element.domains()
def signature_data(self, domain_numbering):
"Signature data for form arguments depend on the global numbering of the form arguments and domains."
s = self._element.signature_data(domain_numbering=domain_numbering)
return ("Argument", self._number, self._part) + s
def __str__(self):
number = str(self._number)
if len(number) == 1:
s = "v_%s" % number
else:
s = "v_{%s}" % number
if self._part is not None:
part = str(self._part)
if len(part) == 1:
s = "%s^%s" % (s, part)
else:
s = "%s^{%s}" % (s, part)
return s
def __repr__(self):
return self._repr
def __eq__(self, other):
"""Deliberately comparing exact type and not using isinstance here,
meaning eventual subclasses must reimplement this function to work
correctly, and instances of this class will compare not equal to
instances of eventual subclasses. The overloading allows
subclasses to distinguish between test and trial functions
with a different non-ufl payload, such as dolfin FunctionSpace
with different mesh. This is necessary because arguments with the
same element and argument number are always equal from a pure ufl
point of view, e.g. TestFunction(V1) == TestFunction(V2) if V1 and V2
are the same ufl element but different dolfin function spaces.
"""
return (type(self) == type(other) and
self._number == other._number and
self._part == other._part and
self._element == other._element)
# --- Helper functions for pretty syntax ---
def TestFunction(element, part=None):
"""UFL value: Create a test function argument to a form."""
return Argument(element, 0, part)
def TrialFunction(element, part=None):
"""UFL value: Create a trial function argument to a form."""
return Argument(element, 1, part)
# --- Helper functions for creating subfunctions on mixed elements ---
def Arguments(element, number):
"""UFL value: Create an Argument in a mixed space, and return a
tuple with the function components corresponding to the subelements."""
return split(Argument(element, number))
def TestFunctions(element):
"""UFL value: Create a TestFunction in a mixed space, and return a
tuple with the function components corresponding to the subelements."""
return Arguments(element, 0)
def TrialFunctions(element):
"""UFL value: Create a TrialFunction in a mixed space, and return a
tuple with the function components corresponding to the subelements."""
return Arguments(element, 1)
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