#ifndef LEXER_H
#define LEXER_H

#include "Token.h"

class Lexer {
public:
    explicit Lexer(QString src);

    const Token& peek() const { return m_cur; }
    Token next();          // consume current and advance
    bool match(TokenKind k);
    Token expect(TokenKind k, const char* msg);

private:
    Token lexOne();
    void skipWsAndComments();
    QChar ch(int i = 0) const;
    void advance(int n = 1);

    Token make(TokenKind k, QString t = QString());

    QString m_src;
    int m_i = 0;
    int m_line = 1;
    int m_col = 1;

    Token m_cur;
};

#endif // LEXER_H