io_error.h

#ifndef SOURCEMETA_CORE_IO_ERROR_H_
#define SOURCEMETA_CORE_IO_ERROR_H_
 
#ifndef SOURCEMETA_CORE_IO_EXPORT
#include <sourcemeta/core/io_export.h>
#endif
 
#include <exception>   // std::exception
#include <filesystem>  // std::filesystem::path
#include <string>      // std::string
#include <string_view> // std::string_view
#include <utility>     // std::move
 
namespace sourcemeta::core {
 
// Exporting symbols that depends on the standard C++ library is considered
// safe.
// https://learn.microsoft.com/en-us/cpp/error-messages/compiler-warnings/compiler-warning-level-2-c4275?view=msvc-170&redirectedfrom=MSDN
#if defined(_MSC_VER)
#pragma warning(disable : 4251 4275)
#endif

class SOURCEMETA_CORE_IO_EXPORT FileViewError : public std::exception {
public:
  FileViewError(std::filesystem::path path, const char *message)
      : path_{std::move(path)}, message_{message} {}
  FileViewError(std::filesystem::path path, std::string message) = delete;
  FileViewError(std::filesystem::path path, std::string &&message) = delete;
  FileViewError(std::filesystem::path path, std::string_view message) = delete;
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return this->message_;
  }

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
  const char *message_;
};

class SOURCEMETA_CORE_IO_EXPORT IOFileNotFoundError : public std::exception {
public:
  IOFileNotFoundError(std::filesystem::path path) : path_{std::move(path)} {}
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "File not found";
  }

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
};

class SOURCEMETA_CORE_IO_EXPORT IOFilePermissionError : public std::exception {
public:
  IOFilePermissionError(std::filesystem::path path) : path_{std::move(path)} {}
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "Permission denied";
  }

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
};

class SOURCEMETA_CORE_IO_EXPORT IOIsADirectoryError : public std::exception {
public:
  IOIsADirectoryError(std::filesystem::path path) : path_{std::move(path)} {}
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "Expected a file but got a directory";
  }

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
};

class SOURCEMETA_CORE_IO_EXPORT IONotADirectoryError : public std::exception {
public:
  IONotADirectoryError(std::filesystem::path path) : path_{std::move(path)} {}
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "Expected a directory but got a file";
  }

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
};

class SOURCEMETA_CORE_IO_EXPORT IOFileAlreadyExistsError
    : public std::exception {
public:
  IOFileAlreadyExistsError(std::filesystem::path path)
      : path_{std::move(path)} {}
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "File already exists";
  }

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
};

class SOURCEMETA_CORE_IO_EXPORT IOReadOutOfBoundsError : public std::exception {
public:
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "Read past the end of the underlying data";
  }
};

class SOURCEMETA_CORE_IO_EXPORT IOStreamWriteError : public std::exception {
public:
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return "Failed to write to stream";
  }
};
 
#if defined(_MSC_VER)
#pragma warning(default : 4251 4275)
#endif
 
} // namespace sourcemeta::core
 
#endif