#ifndef ELOHIMSCRIPT_LEXER_HPP
#define ELOHIMSCRIPT_LEXER_HPP

#include <string_view>
#include "LexToken.hpp"

namespace ElohimScript::Parser {
    class Lexer {
    public:
        Lexer(const char* script) : _script(reinterpret_cast<const char8_t*>(script)) {}
        Lexer(std::u8string_view script) : _script(script) {}
        const LexToken* Lex();

    private:
        std::u8string_view _script;
        size_t _position = -1;

        inline char8_t Consume() {
            if (++_position >= _script.size()) {
                return '\0';
            }
            return _script[_position];
        }

        inline void Progress(size_t steps = 1){
            _position += steps;
        }

        inline char8_t Peek(size_t offset = 1) {
            auto pos = _position + offset;
            if (pos >= _script.size()) {
                return '\0';
            }
            return _script[pos];
        }

        LexToken* LexNext();
        LexToken* LexNumerical(char8_t);
        LexToken* LexDecimal(uint64_t initial);
        IntegerToken* LexHexadecimal();
        IntegerToken* LexOctal();
        IntegerToken* LexBinary();
    };
}

#endif // ELOHIMSCRIPT_LEXER_HPP