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//
// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
// Copyright (c) 2024 Alexander Grund
//
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#ifndef BOOST_LOCALE_FORMATTER_HPP_INCLUDED
#define BOOST_LOCALE_FORMATTER_HPP_INCLUDED
#include <boost/locale/config.hpp>
#include <cstdint>
#include <memory>
#include <string>
#include <unicode/locid.h>
namespace boost { namespace locale { namespace impl_icu {
/// \brief Special base polymorphic class that is used as a character type independent base for all formatter
/// classes
class base_formatter {
public:
virtual ~base_formatter() = default;
};
/// \brief A class that is used for formatting numbers, currency and dates/times
template<typename CharType>
class formatter : public base_formatter {
public:
typedef std::basic_string<CharType> string_type;
/// Format the value and return the number of Unicode code points
virtual string_type format(double value, size_t& code_points) const = 0;
/// Format the value and return the number of Unicode code points
virtual string_type format(uint64_t value, size_t& code_points) const = 0;
/// Format the value and return the number of Unicode code points
virtual string_type format(int64_t value, size_t& code_points) const = 0;
/// Format the value and return the number of Unicode code points
virtual string_type format(int32_t value, size_t& code_points) const = 0;
/// Parse the string and return the number of used characters. If it returns 0
/// then parsing failed.
virtual size_t parse(const string_type& str, double& value) const = 0;
/// Parse the string and return the number of used characters. If it returns 0
/// then parsing failed.
virtual size_t parse(const string_type& str, uint64_t& value) const = 0;
/// Parse the string and return the number of used characters. If it returns 0
/// then parsing failed.
virtual size_t parse(const string_type& str, int64_t& value) const = 0;
/// Parse the string and return the number of used characters. If it returns 0
/// then parsing failed.
virtual size_t parse(const string_type& str, int32_t& value) const = 0;
/// Get formatter for the current state of ios_base -- flags and locale,
/// NULL may be returned if an invalid combination of flags is provided or this type
/// of formatting is not supported by locale.
///
/// Note: formatter is cached. If \a ios is not changed (no flags or locale changed)
/// the formatter would remain the same. Otherwise it would be rebuild and cached
/// for future use. It is useful for saving time for generation
/// of multiple values with same locale.
///
/// For example this code will create a new spelling formatter only once:
///
/// \code
/// std::cout << as::spellout;
/// for(int i=1;i<=10;i++)
/// std::cout << i << std::endl;
/// \endcode
///
///
static std::unique_ptr<formatter>
create(std::ios_base& ios, const icu::Locale& locale, const std::string& encoding);
}; // class formatter
}}} // namespace boost::locale::impl_icu
#endif
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