FilterMaths.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
/***********************************************************************************/
/*  Copyright 2019 Avalanche Warning Service Tyrol                  LWD-TIROL      */
/***********************************************************************************/
/* This file is part of MeteoIO.
    MeteoIO 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.
 
    MeteoIO 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 MeteoIO.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef FILTERMATHS_H
#define FILTERMATHS_H
 
#include <meteoio/meteoFilters/ProcessingBlock.h>
 
#include <meteoio/thirdParty/tinyexpr.h>
#include <map>
 
namespace mio {
 
class FilterMaths : public ProcessingBlock {
        public:
                FilterMaths(const std::vector< std::pair<std::string, std::string> >& vecArgs,
                    const std::string& name, const Config& cfg);
                virtual void process(const unsigned int& param, const std::vector<MeteoData>& ivec,
                    std::vector<MeteoData>& ovec) override;
 
        private:
                bool assertCondition(const double& condition_value, const double& condition_compare,
                        const std::string& condition_operator) const;
                bool assertStringCondition(const std::string& line1, const std::string& line2, const std::string& op);
                std::map<std::string, double> parseBracketExpression(std::string& line);
                void buildSubstitutions();
                void doSubstitutions(const std::vector<MeteoData>& ivec, const size_t& idx);
                std::string doStringSubstitutions(const std::string& line_in, const MeteoData& ielem) const;
                te_expr* compileExpression(const std::string& expression, const te_variable* te_vars, const size_t& sz) const;
                void initExpressionVars(te_variable* vars);
                void parse_args(const std::vector< std::pair<std::string, std::string> >& vecArgs);
                bool isNan(const double& xx) const;
                void checkOperator(const std::string& op);
 
                struct logic_eq {
                        std::string expression;
                        std::string op;
                        std::string compare;
                        logic_eq() : expression(""), op(""), compare("") {}
                };
                std::map<size_t, logic_eq> logic_equations; //collection of conditions the user supplies
                std::map<std::string, double> substitutions; //fixed memory for substitutions
 
                std::string formula; //calculation expression
                std::string formula_else; //expression to use when evaluating to false
                std::string connective; //AND or OR
                std::string assign_param; //assign final value to this parameter
 
                bool skip_nodata; //continue on nodata early on
};
 
} //namespace
 
#endif // FILTERMATHS_H