parse.hpp

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#ifndef PARSE_HPP_
#define PARSE_HPP_

#include <istream>
#include <locale>
#include <ostream>
#include <stdexcept>
#include <string>

class parse_error : public std::runtime_error {
public:
  parse_error(std::string const& msg) : runtime_error{msg} {}
};

class parser
{
public:
  parser(std::istream& input);

  bool get_expr(double& result);

private:
  std::string charify(char c);
  bool get_number(double& result);
  bool get_primary(double& result);
  bool get_mult_expr(double& result);

  std::istream& input_;
  std::ctype<char> const& ctype_;
};

void parse_loop(std::istream& input, std::ostream& output);

#endif