calc_error.hpp

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#ifndef CALC_ERROR_HPP_
#define CALC_ERROR_HPP_

#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <stdexcept>
#include <string>

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

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

class syntax_error : public parse_error {
public:
  syntax_error(std::string const& msg) : parse_error{"syntax error: " + msg} {}
};

class function_error : public calc_error
{
public:
  function_error(std::string const &name, std::size_t expected, std::size_t actual)
  : calc_error{msg(name, expected, actual)}
  {}
private:
  std::string msg(std::string const& name, std::size_t expected, std::size_t actual);
};

class no_such_function : public calc_error {
public:
  no_such_function(std::string const& what) : calc_error{"unknown function: " + what} {}
};

class file_error : public calc_error {
public:
  file_error(std::string const& filename) : calc_error{filename + ": " + std::strerror(errno)} {}
};

#endif