json_error.h

#ifndef SOURCEMETA_CORE_JSON_ERROR_H_
#define SOURCEMETA_CORE_JSON_ERROR_H_
 
#ifndef SOURCEMETA_CORE_JSON_EXPORT
#include <sourcemeta/core/json_export.h>
#endif
 
#include <cstdint>     // std::uint64_t
#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_JSON_EXPORT JSONParseError : public std::exception {
public:
  JSONParseError(const std::uint64_t line, const std::uint64_t column)
      : line_{line}, column_{column},
        message_{"Failed to parse the JSON document"} {}

  JSONParseError(const std::uint64_t line, const std::uint64_t column,
                 const char *message)
      : line_{line}, column_{column}, message_{message} {}
  JSONParseError(const std::uint64_t line, const std::uint64_t column,
                 std::string message) = delete;
  JSONParseError(const std::uint64_t line, const std::uint64_t column,
                 std::string &&message) = delete;
  JSONParseError(const std::uint64_t line, const std::uint64_t column,
                 std::string_view message) = delete;
 
  [[nodiscard]] auto what() const noexcept -> const char * override {
    return this->message_;
  }

  [[nodiscard]] auto line() const noexcept -> std::uint64_t {
    return this->line_;
  }

  [[nodiscard]] auto column() const noexcept -> std::uint64_t {
    return this->column_;
  }
 
private:
  std::uint64_t line_;
  std::uint64_t column_;
  const char *message_;
};

class SOURCEMETA_CORE_JSON_EXPORT JSONFileParseError : public JSONParseError {
public:
  JSONFileParseError(std::filesystem::path path, const std::uint64_t line,
                     const std::uint64_t column, const char *message)
      : JSONParseError{line, column, message}, path_{std::move(path)} {}
  JSONFileParseError(std::filesystem::path path, const std::uint64_t line,
                     const std::uint64_t column, std::string message) = delete;
  JSONFileParseError(std::filesystem::path path, const std::uint64_t line,
                     const std::uint64_t column,
                     std::string &&message) = delete;
  JSONFileParseError(std::filesystem::path path, const std::uint64_t line,
                     const std::uint64_t column,
                     std::string_view message) = delete;

  JSONFileParseError(std::filesystem::path path, const JSONParseError &parent)
      : JSONParseError{parent.line(), parent.column(), parent.what()},
        path_{std::move(path)} {}

  [[nodiscard]] auto path() const noexcept -> const std::filesystem::path & {
    return this->path_;
  }
 
private:
  std::filesystem::path path_;
};
 
#if defined(_MSC_VER)
#pragma warning(default : 4251 4275)
#endif
 
} // namespace sourcemeta::core
 
#endif