#ifndef COMDEL_LEXER_H
#define COMDEL_LEXER_H

#include "parsecontext.h"
#include "presult.h"
#include "sourceerror.h"
#include "token.h"


#include <sstream>
#include <string>
#include <vector>

struct LexerResult {
    std::vector<Token> tokens;
    std::vector<SourceError> errors;
};

class ComdelLexer
{

    enum Radix {
        BIN_NUMBER = 2,
        DEC_NUMBER = 10,
        HEX_NUMBER = 16
    };

    std::string source;
    std::vector<Token> tokens;
    std::vector<SourceError> errors;
    ParseContext* parseContext;
    unsigned fileId;

public:
    ComdelLexer(std::string fileName, std::string source, ParseContext* parseContext);
    LexerResult tokenize();

private:
    void skipWhitespace();

    unsigned takeNumberInRadix(Radix radix);
    unsigned takeHexColor();
    bool digitIsValid(char ch, Radix radix);
    Radix takeRadix();

    PResult<TokenType> nextTokenType();

    Position tokenBegin;
    Position position;
    char ch;

    void skipComment();
    bool skipMultilineComment();

    PResult<TokenType> takeString();
    PResult<TokenType> takeRawString();

    void bump(unsigned count = 1);
    char peek();
    bool eof();
};

#endif // COMDEL_LEXER_H