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mu_parser_internal.cc
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mu_parser_internal.cc
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// ------------------------------------------------------------------------
//
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2019 - 2024 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/mu_parser_internal.h>
#include <deal.II/base/thread_management.h>
#include <deal.II/base/utilities.h>
#include <cmath>
#include <ctime>
#include <limits>
#include <map>
#include <mutex>
#include <random>
#include <vector>
#ifdef DEAL_II_WITH_MUPARSER
# include <muParser.h>
#endif
DEAL_II_NAMESPACE_OPEN
namespace internal
{
namespace FunctionParser
{
int
mu_round(const double val)
{
return static_cast<int>(val + ((val >= 0.0) ? 0.5 : -0.5));
}
double
mu_if(const double condition,
const double thenvalue,
const double elsevalue)
{
if (mu_round(condition) != 0)
return thenvalue;
else
return elsevalue;
}
double
mu_or(const double left, const double right)
{
return static_cast<double>((mu_round(left) != 0) ||
(mu_round(right) != 0));
}
double
mu_and(const double left, const double right)
{
return static_cast<double>((mu_round(left) != 0) &&
(mu_round(right) != 0));
}
double
mu_int(const double value)
{
return static_cast<double>(mu_round(value));
}
double
mu_ceil(const double value)
{
return std::ceil(value);
}
double
mu_floor(const double value)
{
return std::floor(value);
}
double
mu_cot(const double value)
{
return 1.0 / std::tan(value);
}
double
mu_csc(const double value)
{
return 1.0 / std::sin(value);
}
double
mu_sec(const double value)
{
return 1.0 / std::cos(value);
}
double
mu_log(const double value)
{
return std::log(value);
}
double
mu_pow(const double a, const double b)
{
return std::pow(a, b);
}
double
mu_erf(const double value)
{
return std::erf(value);
}
double
mu_erfc(const double value)
{
return std::erfc(value);
}
// Returns a random value in the range [0,1], after initializing the
// generator with the given seed
double
mu_rand_seed(const double seed)
{
static std::mutex rand_mutex;
std::lock_guard<std::mutex> lock(rand_mutex);
std::uniform_real_distribution<> uniform_distribution(0., 1.);
// for each seed a unique random number generator is created,
// which is initialized with the seed itself
static std::map<double, std::mt19937> rng_map;
if (rng_map.find(seed) == rng_map.end())
rng_map[seed] = std::mt19937(static_cast<unsigned int>(seed));
return uniform_distribution(rng_map[seed]);
}
// Returns a random value in the range [0,1]
double
mu_rand()
{
static std::mutex rand_mutex;
std::lock_guard<std::mutex> lock(rand_mutex);
std::uniform_real_distribution<> uniform_distribution(0., 1.);
const unsigned int seed = static_cast<unsigned long>(std::time(nullptr));
static std::mt19937 rng(seed);
return uniform_distribution(rng);
}
std::vector<std::string>
get_function_names()
{
return {// functions predefined by muparser
"sin",
"cos",
"tan",
"asin",
"acos",
"atan",
"sinh",
"cosh",
"tanh",
"asinh",
"acosh",
"atanh",
"atan2",
"log2",
"log10",
"log",
"ln",
"exp",
"sqrt",
"sign",
"rint",
"abs",
"min",
"max",
"sum",
"avg",
// functions we define ourselves above
"if",
"int",
"ceil",
"cot",
"csc",
"floor",
"sec",
"pow",
"erf",
"erfc",
"rand",
"rand_seed"};
}
#ifdef DEAL_II_WITH_MUPARSER
/**
* PIMPL for mu::Parser.
*/
class Parser : public muParserBase
{
public:
operator mu::Parser &()
{
return parser;
}
operator const mu::Parser &() const
{
return parser;
}
protected:
mu::Parser parser;
};
#endif
template <int dim, typename Number>
ParserImplementation<dim, Number>::ParserImplementation()
: initialized(false)
, n_vars(0)
{}
template <int dim, typename Number>
void
ParserImplementation<dim, Number>::initialize(
const std::string &variables,
const std::vector<std::string> &expressions,
const std::map<std::string, double> &constants,
const bool time_dependent)
{
this->parser_data.clear(); // this will reset all thread-local objects
this->constants = constants;
this->var_names = Utilities::split_string_list(variables, ',');
this->expressions = expressions;
AssertThrow(((time_dependent) ? dim + 1 : dim) == this->var_names.size(),
ExcMessage("Wrong number of variables"));
// Now we define how many variables we expect to read in. We distinguish
// between two cases: Time dependent problems, and not time dependent
// problems. In the first case the number of variables is given by the
// dimension plus one. In the other case, the number of variables is equal
// to the dimension. Once we parsed the variables string, if none of this
// is the case, then an exception is thrown.
if (time_dependent)
this->n_vars = dim + 1;
else
this->n_vars = dim;
// create a parser object for the current thread we can then query in
// value() and vector_value(). this is not strictly necessary because a
// user may never call these functions on the current thread, but it gets
// us error messages about wrong formulas right away
this->init_muparser();
this->initialized = true;
}
template <int dim, typename Number>
void
ParserImplementation<dim, Number>::init_muparser() const
{
#ifdef DEAL_II_WITH_MUPARSER
// check that we have not already initialized the parser on the
// current thread, i.e., that the current function is only called
// once per thread
ParserData &data = this->parser_data.get();
Assert(data.parsers.empty() && data.vars.empty(), ExcInternalError());
const unsigned int n_components = expressions.size();
// initialize the objects for the current thread
data.parsers.reserve(n_components);
data.vars.resize(this->var_names.size());
for (unsigned int component = 0; component < n_components; ++component)
{
data.parsers.emplace_back(std::make_unique<Parser>());
mu::Parser &parser = dynamic_cast<Parser &>(*data.parsers.back());
for (const auto &constant : this->constants)
parser.DefineConst(constant.first, constant.second);
for (unsigned int iv = 0; iv < this->var_names.size(); ++iv)
parser.DefineVar(this->var_names[iv], &data.vars[iv]);
// define some compatibility functions:
parser.DefineFun("if", mu_if, true);
parser.DefineOprt("|", mu_or, 1);
parser.DefineOprt("&", mu_and, 2);
parser.DefineFun("int", mu_int, true);
parser.DefineFun("ceil", mu_ceil, true);
parser.DefineFun("cot", mu_cot, true);
parser.DefineFun("csc", mu_csc, true);
parser.DefineFun("floor", mu_floor, true);
parser.DefineFun("sec", mu_sec, true);
parser.DefineFun("log", mu_log, true);
parser.DefineFun("pow", mu_pow, true);
parser.DefineFun("erfc", mu_erfc, true);
// Disable optimizations (by passing false) that assume the functions
// will always return the same value:
parser.DefineFun("rand_seed", mu_rand_seed, false);
parser.DefineFun("rand", mu_rand, false);
try
{
// muparser expects that functions have no
// space between the name of the function and the opening
// parenthesis. this is awkward because it is not backward
// compatible to the library we used to use before muparser
// (the fparser library) but also makes no real sense.
// consequently, in the expressions we set, remove any space
// we may find after function names
std::string transformed_expression = this->expressions[component];
for (const auto ¤t_function_name : get_function_names())
{
const unsigned int function_name_length =
current_function_name.size();
std::string::size_type pos = 0;
while (true)
{
// try to find any occurrences of the function name
pos =
transformed_expression.find(current_function_name, pos);
if (pos == std::string::npos)
break;
// replace whitespace until there no longer is any
while (
(pos + function_name_length <
transformed_expression.size()) &&
((transformed_expression[pos + function_name_length] ==
' ') ||
(transformed_expression[pos + function_name_length] ==
'\t')))
transformed_expression.erase(
transformed_expression.begin() + pos +
function_name_length);
// move the current search position by the size of the
// actual function name
pos += function_name_length;
}
}
// now use the transformed expression
parser.SetExpr(transformed_expression);
}
catch (mu::ParserError &e)
{
std::cerr << "Message: <" << e.GetMsg() << ">\n";
std::cerr << "Formula: <" << e.GetExpr() << ">\n";
std::cerr << "Token: <" << e.GetToken() << ">\n";
std::cerr << "Position: <" << e.GetPos() << ">\n";
std::cerr << "Errc: <" << e.GetCode() << ">" << std::endl;
AssertThrow(false, ExcParseError(e.GetCode(), e.GetMsg()));
}
}
#else
AssertThrow(false, ExcNeedsFunctionparser());
#endif
}
template <int dim, typename Number>
Number
ParserImplementation<dim, Number>::do_value(const Point<dim> &p,
const double time,
unsigned int component) const
{
#ifdef DEAL_II_WITH_MUPARSER
Assert(this->initialized == true, ExcNotInitialized());
// initialize the parser if that hasn't happened yet on the current
// thread
internal::FunctionParser::ParserData &data = this->parser_data.get();
if (data.vars.empty())
init_muparser();
for (unsigned int i = 0; i < dim; ++i)
data.vars[i] = p[i];
if (dim != this->n_vars)
data.vars[dim] = time;
try
{
Assert(dynamic_cast<Parser *>(data.parsers[component].get()),
ExcInternalError());
// NOLINTNEXTLINE don't warn about using static_cast once we check
mu::Parser &parser = static_cast<Parser &>(*data.parsers[component]);
return parser.Eval();
} // try
catch (mu::ParserError &e)
{
std::cerr << "Message: <" << e.GetMsg() << ">\n";
std::cerr << "Formula: <" << e.GetExpr() << ">\n";
std::cerr << "Token: <" << e.GetToken() << ">\n";
std::cerr << "Position: <" << e.GetPos() << ">\n";
std::cerr << "Errc: <" << e.GetCode() << ">" << std::endl;
AssertThrow(false, ExcParseError(e.GetCode(), e.GetMsg()));
} // catch
#else
(void)p;
(void)time;
(void)component;
AssertThrow(false, ExcNeedsFunctionparser());
#endif
return std::numeric_limits<double>::signaling_NaN();
}
template <int dim, typename Number>
void
ParserImplementation<dim, Number>::do_all_values(
const Point<dim> &p,
const double time,
ArrayView<Number> &values) const
{
#ifdef DEAL_II_WITH_MUPARSER
Assert(this->initialized == true, ExcNotInitialized());
// initialize the parser if that hasn't happened yet on the current
// thread
internal::FunctionParser::ParserData &data = this->parser_data.get();
if (data.vars.empty())
init_muparser();
for (unsigned int i = 0; i < dim; ++i)
data.vars[i] = p[i];
if (dim != this->n_vars)
data.vars[dim] = time;
AssertDimension(values.size(), data.parsers.size());
try
{
for (unsigned int component = 0; component < data.parsers.size();
++component)
{
Assert(dynamic_cast<Parser *>(data.parsers[component].get()),
ExcInternalError());
mu::Parser &parser =
// We just checked that the pointer is valid so suppress the
// clang-tidy check
static_cast<Parser &>(*data.parsers[component]); // NOLINT
values[component] = parser.Eval();
}
} // try
catch (mu::ParserError &e)
{
std::cerr << "Message: <" << e.GetMsg() << ">\n";
std::cerr << "Formula: <" << e.GetExpr() << ">\n";
std::cerr << "Token: <" << e.GetToken() << ">\n";
std::cerr << "Position: <" << e.GetPos() << ">\n";
std::cerr << "Errc: <" << e.GetCode() << ">" << std::endl;
AssertThrow(false, ExcParseError(e.GetCode(), e.GetMsg()));
} // catch
#else
(void)p;
(void)time;
(void)values;
AssertThrow(false, ExcNeedsFunctionparser());
#endif
}
// explicit instantiations
#include "mu_parser_internal.inst"
} // namespace FunctionParser
} // namespace internal
DEAL_II_NAMESPACE_CLOSE