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// Gmsh - Copyright (C) 1997-2021 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// issues on https://gitlab.onelab.info/gmsh/gmsh/issues.
#include "mathEvaluator.h"
#if defined(HAVE_MATHEX)
mathEvaluator::mathEvaluator(std::vector<std::string> &expressions,
const std::vector<std::string> &variables)
{
static std::string lastError;
_expressions.resize(expressions.size());
_variables.resize(variables.size(), 0.);
bool error = false;
for(std::size_t i = 0; i < expressions.size(); i++) {
_expressions[i] = new smlib::mathex();
for(std::size_t j = 0; j < variables.size(); j++)
_expressions[i]->addvar(variables[j], &_variables[j]);
try {
_expressions[i]->expression(expressions[i]);
_expressions[i]->parse();
} catch(smlib::mathex::error &e) {
if(e.what() + expressions[i] != lastError) {
lastError = e.what() + expressions[i];
Msg::Error(e.what());
std::string pos(_expressions[i]->stopposition(), ' ');
pos.push_back('^');
Msg::Error(expressions[i].c_str());
Msg::Error(pos.c_str());
}
error = true;
}
}
if(error) {
for(std::size_t i = 0; i < _expressions.size(); i++)
delete(_expressions[i]);
_expressions.clear();
expressions.clear();
}
}
mathEvaluator::~mathEvaluator()
{
for(std::size_t i = 0; i < _expressions.size(); i++) delete(_expressions[i]);
}
bool mathEvaluator::eval(const std::vector<double> &values,
std::vector<double> &res)
{
if(values.size() != _variables.size()) {
Msg::Error("Given %d value(s) for %d variable(s)", values.size(),
_variables.size());
return false;
}
if(res.size() != _expressions.size()) {
Msg::Error("Given %d result(s) for %d expression(s)", res.size(),
_expressions.size());
return false;
}
for(std::size_t i = 0; i < values.size(); i++) _variables[i] = values[i];
for(std::size_t i = 0; i < _expressions.size(); i++) {
try {
res[i] = _expressions[i]->eval();
} catch(smlib::mathex::error &e) {
Msg::Error(e.what());
double eps = 1.e-20;
for(std::size_t j = 0; j < values.size(); j++)
_variables[j] = values[j] + eps;
try {
res[i] = _expressions[i]->eval();
} catch(smlib::mathex::error &e2) {
Msg::Error(e2.what());
return false;
}
}
}
return true;
}
#endif
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