pythonexpression.h

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/*
 *
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 *               ##   ##  ##   ##  ##      ##      ## ### ##
 *              ##   ##  ##   ##  ####    ####    ##  #  ##
 *             ##   ##  ##   ##  ##      ##      ##     ##
 *            ##   ##  ##   ##  ##      ##      ##     ##
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library 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 2.1 of the License, or (at your option) any later version.
 *
 *  This program 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 this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef pythonexpression_h
#define pythonexpression_h
 
#include "function.h"
 
#ifndef PyObject_HEAD
struct _object;
typedef _object PyObject;
#endif


#define _IFT_PythonExpression_Name "pythonexpression"
#define _IFT_PythonExpression_f "f" 
#define _IFT_PythonExpression_dfdt "dfdt" 
#define _IFT_PythonExpression_d2fdt2 "d2fdt2" 
#define _IFT_PythonExpression_ffile "fpath" 
#define _IFT_PythonExpression_dfdtfile "dfdtpath" 
#define _IFT_PythonExpression_d2fdt2file "d2fdt2path" 
 
 
namespace oofem {
class OOFEM_EXPORT PythonExpression : public Function
{
private:
    std :: string fExpression;
    std :: string dfdtExpression = "0";
    std :: string d2fdt2Expression = "0";
    
 
    PyObject *f;
    PyObject *dfdt;
    PyObject *d2fdt2;
 
    PyObject *main_dict = nullptr;

    PyObject *getDict(const std :: map< std :: string, FunctionArgument > &valDict);
    void getArray(FloatArray &answer, PyObject **func, const std :: map< std :: string, FunctionArgument > &valDict);
    double getScalar(PyObject *func, double time);
    // helper method to convert a PyObject to a double
    double pyObj2double(PyObject *obj) ;
   
public:
    PythonExpression(int n, Domain * d);
    virtual ~PythonExpression();

    void initializeFrom(InputRecord &ir) override;
    void giveInputRecord(DynamicInputRecord &ir) override;
 
    void evaluate(FloatArray &answer, const std :: map< std :: string, FunctionArgument > &valDict, GaussPoint *gp=nullptr, double param=0.) override;
    void evaluateVelocity(FloatArray &answer, const std :: map< std :: string, FunctionArgument > &valDict);
    void evaluateAcceleration(FloatArray &answer, const std :: map< std :: string, FunctionArgument > &valDict);
 
    double evaluateAtTime(double t) override;
    double evaluateVelocityAtTime(double t) override;
    double evaluateAccelerationAtTime(double t) override;
 
    const char *giveClassName() const override { return "PythonExpression"; }
    const char *giveInputRecordName() const override { return _IFT_PythonExpression_Name; }
private:
    void readFile2String(const std :: string &path, std :: string &content);
};
} // end namespace oofem
#endif // pythonexpression_h