/* PIA - Lenguajes Modernos de Programación
 * FACULTAD DE CIENCIAS FÍSICO MATEMÁTICAS
 * Luis Sebastián Martínez Vega - LCC */

#ifndef LEXER_H
#define LEXER_H
#include <string>

enum token_type{
  sum,
  substraction,
  division,
  multiplication,
  power,
  variable,
  number,
  function,
  left_parens,
  right_parens,
  nil
};

struct Token{
  token_type type;
  std::string value;
  Token(token_type type, const std::string &value) : type(type), value(value){}
};

class Lexer{
private:
  std::string text;
  size_t current_char;
  Token current_token;
  std::string createNumber();
  bool matchFunction(const std::string &function_name);
public:
  Lexer(std::string text = {});
  void setText(std::string text);
  Token getCurrentToken();
  Token match();
  Token nextToken();
};

#endif /* LEXER_H */