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#ifndef POM_HPP_
#define POM_HPP_
#include <exception>
#include <cstdint>
#include <string_view>
#include <memory>
#include <optional>
namespace pom {
class Error: public std::exception {
public:
~Error();
std::string_view file() const noexcept;
uint64_t line() const noexcept;
std::string_view message() const noexcept;
const Error *next() const noexcept;
std::string_view to_string() noexcept;
/// You should only call this on the first error in an error list.
/// (This can't be enforced with constness because it needs to
/// override `std::exception::what`.)
virtual const char *what() const noexcept override;
private:
friend class Configuration;
friend class Parser;
Error() = delete;
Error(void *C_error);
Error(const void *C_error);
void *C;
bool m_is_original;
std::unique_ptr<const Error> m_next;
};
class Allocator {
public:
virtual ~Allocator() = 0;
virtual void *calloc(size_t, size_t) = 0;
virtual void *realloc(void *, size_t) = 0;
virtual void free(void *) = 0;
};
class Settings {
public:
Settings();
/// Set allocator.
void set_allocator(std::shared_ptr<Allocator> allocator) {
m_allocator = allocator;
}
void set_error_language(std::string_view lang);
private:
void to_C(void *C) const;
friend class Configuration;
char m_error_lang[16] = {};
std::shared_ptr<Allocator> m_allocator;
uint32_t version = 1; // future-proofing
};
class Reader {
public:
virtual size_t read(char *buf, size_t count) = 0;
};
class Configuration {
public:
Configuration();
Configuration(std::string_view filename, Reader &source, const Settings *settings = nullptr);
Configuration(std::string_view filename, std::istream &stream, const Settings *settings = nullptr);
Configuration(std::string_view path, const Settings *settings = nullptr);
Configuration(std::string_view filename, std::string_view string, const Settings *settings = nullptr);
~Configuration();
std::optional<std::string_view> get(std::string_view key) const;
std::string_view get_or_default(std::string_view key, std::string_view dflt) const;
Configuration section(std::string_view name) const;
void merge(const Configuration &other);
private:
explicit Configuration(void *c): C(c) {}
void *C;
};
} // namespace pom
#endif // POM_HPP_
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