eparser.h

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#ifndef EPARSER_H
#define EPARSER_H
#include <string>
#include "emath.h"
#pragma once
namespace emthp {
    enum TokenType {
        T_PLUS,
        T_MINUS,
        T_NUMBER,
        T_VARIABLE,
        T_EXPONENT,
        T_EOF
    };
    struct Token {
        public:
            TokenType type;
            double value;
    };
    class Lexer {
        public:
            Lexer(const std::string& input) noexcept;
            Lexer& operator =(const Lexer& ogn) noexcept;
            Token next() noexcept;
            void back() noexcept;
        private:
            std::string _input;
            long unsigned int _pos;
            double read_number() noexcept;
            static std::string clean(const std::string& input) noexcept;
            static constexpr inline bool is_digit(const char& c) noexcept {return ((c >= '0' && c <= '9') || c == '.');}
    };
    class Parser {
        public:
            Parser(const std::string& input) noexcept;
            Parser& operator =(const Parser& ogn) noexcept;
            emth::Polynomial parse_polynomial() noexcept;
            emth::Monomial parse_monomial() noexcept;
        private:
            Lexer _lexer;
            double parse_number() noexcept;
    };
}
#endif