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 Hu Chunming
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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_LOCALE_LOCALIZATION_BACKEND_HPP
#define BOOST_LOCALE_LOCALIZATION_BACKEND_HPP
#include <boost/locale/config.hpp>
#include <boost/locale/generator.hpp>
#include <boost/locale/hold_ptr.hpp>
#include <locale>
#include <memory>
#include <string>
#include <vector>
#ifdef BOOST_MSVC
# pragma warning(push)
# pragma warning(disable : 4275 4251 4231 4660)
#endif
namespace boost { namespace locale {
/// \brief this class represents a localization backend that can be used for localizing your application.
///
/// Backends are usually registered inside the localization backends manager and allow transparent support
/// of different backends, so a user can switch the backend by simply linking the application to the correct one.
///
/// Backends may support different tuning options, but these are the default options available to the user
/// for all of them
///
/// -# \c locale - the name of the locale in POSIX format like en_US.UTF-8
/// -# \c use_ansi_encoding - select system locale using ANSI codepages rather then UTF-8 under Windows
/// by default
/// -# \c message_path - path to the location of message catalogs (vector of strings)
/// -# \c message_application - the name of applications that use message catalogs (vector of strings)
///
/// Each backend can be installed with a different default priority so when you work with two different backends,
/// you can specify priority so this backend will be chosen according to their priority.
class BOOST_LOCALE_DECL localization_backend {
protected:
localization_backend(const localization_backend&) = default;
localization_backend& operator=(const localization_backend&) = default;
public:
localization_backend() = default;
virtual ~localization_backend();
/// Make a polymorphic copy of the backend
virtual localization_backend* clone() const = 0;
/// Set option for backend, for example "locale" or "encoding"
virtual void set_option(const std::string& name, const std::string& value) = 0;
/// Clear all options
virtual void clear_options() = 0;
/// Create a facet for category \a category and character type \a type
virtual std::locale install(const std::locale& base, category_t category, char_facet_t type) = 0;
}; // localization_backend
/// \brief Localization backend manager is a class that holds various backend and allows creation
/// of their combination or selection
class BOOST_LOCALE_DECL localization_backend_manager {
public:
/// New empty localization_backend_manager
localization_backend_manager();
/// Copy localization_backend_manager
localization_backend_manager(const localization_backend_manager&);
/// Assign localization_backend_manager
localization_backend_manager& operator=(const localization_backend_manager&);
/// Destructor
~localization_backend_manager();
/// Create new localization backend according to current settings.
std::unique_ptr<localization_backend> get() const;
BOOST_DEPRECATED("This function is deprecated, use 'get()' instead")
std::unique_ptr<localization_backend> get_unique_ptr() const { return get(); }
/// Add new backend to the manager, each backend should be uniquely defined by its name.
///
/// This library provides: "icu", "posix", "winapi" and "std" backends.
void add_backend(const std::string& name, std::unique_ptr<localization_backend> backend);
/// Create new localization backend according to current settings. Ownership is passed to caller
localization_backend* create() const;
/// Add new backend to the manager, each backend should be uniquely defined by its name.
/// ownership on backend is transfered
///
/// This library provides: "icu", "posix", "winapi" and "std" backends.
void adopt_backend(const std::string& name, localization_backend* backend);
/// Clear backend
void remove_all_backends();
/// Get list of all available backends
std::vector<std::string> get_all_backends() const;
/// Select specific backend by name for a category \a category. It allows combining different
/// backends for user preferences.
void select(const std::string& backend_name, category_t category = all_categories);
/// Set new global backend manager, the old one is returned.
///
/// This function is thread safe
static localization_backend_manager global(const localization_backend_manager&);
/// Get global backend manager
///
/// This function is thread safe
static localization_backend_manager global();
private:
class impl;
hold_ptr<impl> pimpl_;
};
}} // namespace boost::locale
#ifdef BOOST_MSVC
# pragma warning(pop)
#endif
#endif
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