SimpleCalc.h

#pragma once

namespace BeeeOn {

class SimpleCalc {
public:
        double evaluate(const std::string &input) const;

protected:
        double parseTerm(
                std::string::const_iterator &at,
                std::string::const_iterator end) const;
        char parseOpOrEOF(
                std::string::const_iterator &at,
                std::string::const_iterator end) const;
        void skipWhitespace(
                std::string::const_iterator &at,
                std::string::const_iterator end) const;

        void apply(double &result, char op, double tmp) const;

        bool isWhitespace(const char c) const;
        bool isOperator(const char c) const;
        bool isTerm(const char c) const;
};

}