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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2019 - 2025 by the deal.II authors
//
// This file is part of the deal.II library.
//
// Part of the source code is dual licensed under Apache-2.0 WITH
// LLVM-exception OR LGPL-2.1-or-later. Detailed license information
// governing the source code and code contributions can be found in
// LICENSE.md and CONTRIBUTING.md at the top level directory of deal.II.
//
// ------------------------------------------------------------------------
#include <deal.II/base/array_view.h>
#include <deal.II/base/mu_parser_internal.h>
#include <deal.II/base/patterns.h>
#include <deal.II/base/tensor.h>
#include <deal.II/base/tensor_function.h>
#include <deal.II/base/tensor_function_parser.h>
#include <deal.II/base/utilities.h>
#include <map>
DEAL_II_NAMESPACE_OPEN
template <int rank, int dim, typename Number>
const std::vector<std::string> &
TensorFunctionParser<rank, dim, Number>::get_expressions() const
{
return this->expressions;
}
template <int rank, int dim, typename Number>
TensorFunctionParser<rank, dim, Number>::TensorFunctionParser(
const double initial_time)
: TensorFunction<rank, dim, Number>(initial_time)
, n_components(Utilities::pow(dim, rank))
{}
template <int rank, int dim, typename Number>
TensorFunctionParser<rank, dim, Number>::TensorFunctionParser(
const std::string &expression,
const std::string &constants,
const std::string &variable_names)
: TensorFunction<rank, dim, Number>()
, n_components(Utilities::pow(dim, rank))
{
auto constants_map = Patterns::Tools::Convert<ConstMap>::to_value(
constants,
Patterns::Map(Patterns::Anything(),
Patterns::Double(),
0,
Patterns::Map::max_int_value,
",",
"="));
initialize(variable_names,
expression,
constants_map,
Utilities::split_string_list(variable_names, ",").size() ==
dim + 1);
}
template <int rank, int dim, typename Number>
void
TensorFunctionParser<rank, dim, Number>::initialize(
const std::string &variables,
const std::vector<std::string> &expressions,
const std::map<std::string, double> &constants,
const bool time_dependent)
{
AssertThrow(this->n_components == expressions.size(),
ExcInvalidExpressionSize(this->n_components, expressions.size()));
internal::FunctionParser::ParserImplementation<dim, Number>::initialize(
variables, expressions, constants, time_dependent);
}
template <int rank, int dim, typename Number>
void
TensorFunctionParser<rank, dim, Number>::initialize(
const std::string &vars,
const std::string &expression,
const std::map<std::string, double> &constants,
const bool time_dependent)
{
initialize(vars,
Utilities::split_string_list(expression, ';'),
constants,
time_dependent);
}
template <int rank, int dim, typename Number>
Tensor<rank, dim, Number>
TensorFunctionParser<rank, dim, Number>::value(const Point<dim> &p) const
{
std::array<Number, Tensor<rank, dim, Number>::n_independent_components>
values;
auto values_view = make_array_view(values.begin(), values.end());
this->do_all_values(p, this->get_time(), values_view);
return Tensor<rank, dim, Number>(
make_array_view(values.begin(), values.end()));
}
template <int rank, int dim, typename Number>
void
TensorFunctionParser<rank, dim, Number>::value_list(
const std::vector<Point<dim>> &p,
std::vector<Tensor<rank, dim, Number>> &values) const
{
Assert(p.size() == values.size(),
ExcDimensionMismatch(p.size(), values.size()));
for (unsigned int i = 0; i < p.size(); ++i)
{
values[i] = value(p[i]);
}
}
// explicit instantiations
#include "base/tensor_function_parser.inst"
DEAL_II_NAMESPACE_CLOSE
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