function_parser.hpp

Go to the documentation of this file.

 
#ifndef FUNCTION_HPP
#define FUNCTION_HPP
 
#include <functional>
#include <string>
 
class FunctionParserBase {
  public:
    virtual ~FunctionParserBase() = default;
    virtual std::function<double(double)> parse() = 0;
 
    static std::function<double(double)> parseFunction(const std::string& function_str);
 
    static bool isPolynomial(const std::string& expression);
    static bool isTrigonometric(const std::string& expression);
    FunctionParserBase(std::string function_str);
 
  protected:
    std::string function_str;  
    static bool icontains(const std::string& hay, const std::string& needle);
    static std::string removeSpaces(const std::string& function_str);
    static std::vector<std::string> splitSignTokens(const std::string& expr_no_ws);
    static std::pair<double, std::string> parseOptionalCoefficient(const std::string& token);
 
  private:
    friend class FunctionParserBaseTester;  
};
 
class PolynomialParser : public FunctionParserBase {
  public:
    PolynomialParser(std::string function_str);
    std::function<double(double)> parse() override;
 
  private:
    friend class PolynomialParserTester;  
    static bool parseTokenAsPolyTerm(const std::string& raw_token, std::function<double(double)>& out_term);
};
 
class TrigonometricParser : public FunctionParserBase {
  public:
    TrigonometricParser(std::string function_str);
    std::function<double(double)> parse() override;
 
  private:
    friend class TrigonometricParserTester;  
    static bool parseTokenAsTrigTerm(const std::string& raw_token, std::function<double(double)>& out_term);
};
 
#endif  // FUNCTION_HPP