808 lines
28 KiB
C++
808 lines
28 KiB
C++
//
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// Copyright (c) 2009-2011 Artyom Beilis (Tonkikh)
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_LOCALE_MESSAGE_HPP_INCLUDED
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#define BOOST_LOCALE_MESSAGE_HPP_INCLUDED
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#include <boost/locale/config.hpp>
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#ifdef BOOST_MSVC
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# pragma warning(push)
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# pragma warning(disable : 4275 4251 4231 4660)
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#endif
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#include <locale>
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#include <string>
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#include <vector>
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#include <set>
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#include <memory>
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#include <boost/locale/formatting.hpp>
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namespace boost {
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namespace locale {
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///
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/// \defgroup message Message Formatting (translation)
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///
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///This module provides message translation functionality, i.e. allow your application to speak native language
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///
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/// @{
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///
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/// \cond INTERNAL
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template<typename CharType>
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struct base_message_format: public std::locale::facet
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{
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};
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/// \endcond
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///
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/// \brief This facet provides message formatting abilities
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///
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template<typename CharType>
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class message_format : public base_message_format<CharType>
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{
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public:
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///
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/// Character type
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///
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typedef CharType char_type;
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///
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/// String type
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///
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typedef std::basic_string<CharType> string_type;
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///
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/// Default constructor
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///
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message_format(size_t refs = 0) :
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base_message_format<CharType>(refs)
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{
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}
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///
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/// This function returns a pointer to the string for a message defined by a \a context
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/// and identification string \a id. Both create a single key for message lookup in
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/// a domain defined by \a domain_id.
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///
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/// If \a context is NULL it is not considered to be a part of the key
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///
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/// If a translated string is found, it is returned, otherwise NULL is returned
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///
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///
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virtual char_type const *get(int domain_id,char_type const *context,char_type const *id) const = 0;
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///
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/// This function returns a pointer to the string for a plural message defined by a \a context
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/// and identification string \a single_id.
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///
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/// If \a context is NULL it is not considered to be a part of the key
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///
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/// Both create a single key for message lookup in
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/// a domain defined \a domain_id. \a n is used to pick the correct translation string for a specific
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/// number.
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///
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/// If a translated string is found, it is returned, otherwise NULL is returned
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///
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///
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virtual char_type const *get(int domain_id,char_type const *context,char_type const *single_id,int n) const = 0;
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///
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/// Convert a string that defines \a domain to the integer id used by \a get functions
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///
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virtual int domain(std::string const &domain) const = 0;
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///
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/// Convert the string \a msg to target locale's encoding. If \a msg is already
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/// in target encoding it would be returned otherwise the converted
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/// string is stored in temporary \a buffer and buffer.c_str() is returned.
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///
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/// Note: for char_type that is char16_t, char32_t and wchar_t it is no-op, returns
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/// msg
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///
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virtual char_type const *convert(char_type const *msg,string_type &buffer) const = 0;
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#if defined (__SUNPRO_CC) && defined (_RWSTD_VER)
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std::locale::id& __get_id (void) const { return id; }
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#endif
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protected:
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virtual ~message_format()
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{
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}
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};
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/// \cond INTERNAL
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namespace details {
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inline bool is_us_ascii_char(char c)
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{
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// works for null terminated strings regardless char "signness"
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return 0<c && c<0x7F;
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}
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inline bool is_us_ascii_string(char const *msg)
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{
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while(*msg) {
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if(!is_us_ascii_char(*msg++))
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return false;
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}
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return true;
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}
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template<typename CharType>
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struct string_cast_traits {
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static CharType const *cast(CharType const *msg,std::basic_string<CharType> &/*unused*/)
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{
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return msg;
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}
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};
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template<>
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struct string_cast_traits<char> {
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static char const *cast(char const *msg,std::string &buffer)
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{
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if(is_us_ascii_string(msg))
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return msg;
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buffer.reserve(strlen(msg));
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char c;
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while((c=*msg++)!=0) {
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if(is_us_ascii_char(c))
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buffer+=c;
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}
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return buffer.c_str();
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}
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};
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} // details
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/// \endcond
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///
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/// \brief This class represents a message that can be converted to a specific locale message
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///
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/// It holds the original ASCII string that is queried in the dictionary when converting to the output string.
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/// The created string may be UTF-8, UTF-16, UTF-32 or other 8-bit encoded string according to the target
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/// character type and locale encoding.
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///
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template<typename CharType>
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class basic_message {
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public:
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typedef CharType char_type; ///< The character this message object is used with
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typedef std::basic_string<char_type> string_type; ///< The string type this object can be used with
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typedef message_format<char_type> facet_type; ///< The type of the facet the messages are fetched with
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///
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/// Create default empty message
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///
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basic_message() :
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n_(0),
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c_id_(0),
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c_context_(0),
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c_plural_(0)
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{
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}
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///
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/// Create a simple message from 0 terminated string. The string should exist
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/// until the message is destroyed. Generally useful with static constant strings
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///
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explicit basic_message(char_type const *id) :
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n_(0),
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c_id_(id),
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c_context_(0),
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c_plural_(0)
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{
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}
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///
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/// Create a simple plural form message from 0 terminated strings. The strings should exist
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/// until the message is destroyed. Generally useful with static constant strings.
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///
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/// \a n is the number, \a single and \a plural are singular and plural forms of the message
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///
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explicit basic_message(char_type const *single,char_type const *plural,int n) :
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n_(n),
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c_id_(single),
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c_context_(0),
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c_plural_(plural)
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{
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}
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///
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/// Create a simple message from 0 terminated strings, with context
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/// information. The string should exist
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/// until the message is destroyed. Generally useful with static constant strings
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///
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explicit basic_message(char_type const *context,char_type const *id) :
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n_(0),
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c_id_(id),
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c_context_(context),
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c_plural_(0)
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{
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}
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///
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/// Create a simple plural form message from 0 terminated strings, with context. The strings should exist
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/// until the message is destroyed. Generally useful with static constant strings.
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///
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/// \a n is the number, \a single and \a plural are singular and plural forms of the message
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///
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explicit basic_message(char_type const *context,char_type const *single,char_type const *plural,int n) :
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n_(n),
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c_id_(single),
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c_context_(context),
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c_plural_(plural)
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{
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}
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///
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/// Create a simple message from a string.
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///
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explicit basic_message(string_type const &id) :
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n_(0),
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c_id_(0),
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c_context_(0),
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c_plural_(0),
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id_(id)
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{
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}
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///
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/// Create a simple plural form message from strings.
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///
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/// \a n is the number, \a single and \a plural are single and plural forms of the message
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///
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explicit basic_message(string_type const &single,string_type const &plural,int number) :
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n_(number),
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c_id_(0),
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c_context_(0),
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c_plural_(0),
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id_(single),
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plural_(plural)
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{
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}
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///
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/// Create a simple message from a string with context.
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///
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explicit basic_message(string_type const &context,string_type const &id) :
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n_(0),
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c_id_(0),
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c_context_(0),
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c_plural_(0),
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id_(id),
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context_(context)
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{
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}
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///
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/// Create a simple plural form message from strings.
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///
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/// \a n is the number, \a single and \a plural are single and plural forms of the message
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///
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explicit basic_message(string_type const &context,string_type const &single,string_type const &plural,int number) :
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n_(number),
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c_id_(0),
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c_context_(0),
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c_plural_(0),
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id_(single),
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context_(context),
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plural_(plural)
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{
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}
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///
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/// Copy an object
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///
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basic_message(basic_message const &other) :
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n_(other.n_),
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c_id_(other.c_id_),
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c_context_(other.c_context_),
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c_plural_(other.c_plural_),
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id_(other.id_),
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context_(other.context_),
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plural_(other.plural_)
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{
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}
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///
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/// Assign other message object to this one
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///
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basic_message const &operator=(basic_message const &other)
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{
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if(this==&other) {
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return *this;
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}
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basic_message tmp(other);
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swap(tmp);
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return *this;
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}
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///
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/// Swap two message objects
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///
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void swap(basic_message &other)
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{
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std::swap(n_,other.n_);
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std::swap(c_id_,other.c_id_);
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std::swap(c_context_,other.c_context_);
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std::swap(c_plural_,other.c_plural_);
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id_.swap(other.id_);
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context_.swap(other.context_);
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plural_.swap(other.plural_);
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}
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///
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/// Message class can be explicitly converted to string class
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///
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operator string_type () const
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{
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return str();
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}
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///
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/// Translate message to a string in the default global locale, using default domain
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///
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string_type str() const
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{
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std::locale loc;
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return str(loc,0);
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}
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///
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/// Translate message to a string in the locale \a locale, using default domain
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///
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string_type str(std::locale const &locale) const
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{
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return str(locale,0);
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}
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///
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/// Translate message to a string using locale \a locale and message domain \a domain_id
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///
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string_type str(std::locale const &locale,std::string const &domain_id) const
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{
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int id=0;
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if(std::has_facet<facet_type>(locale))
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id=std::use_facet<facet_type>(locale).domain(domain_id);
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return str(locale,id);
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}
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///
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/// Translate message to a string using the default locale and message domain \a domain_id
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///
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string_type str(std::string const &domain_id) const
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{
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int id=0;
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std::locale loc;
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if(std::has_facet<facet_type>(loc))
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id=std::use_facet<facet_type>(loc).domain(domain_id);
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return str(loc,id);
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}
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///
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/// Translate message to a string using locale \a loc and message domain index \a id
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///
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string_type str(std::locale const &loc,int id) const
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{
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string_type buffer;
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char_type const *ptr = write(loc,id,buffer);
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if(ptr == buffer.c_str())
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return buffer;
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else
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buffer = ptr;
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return buffer;
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}
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///
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/// Translate message and write to stream \a out, using imbued locale and domain set to the
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/// stream
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///
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void write(std::basic_ostream<char_type> &out) const
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{
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std::locale const &loc = out.getloc();
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int id = ios_info::get(out).domain_id();
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string_type buffer;
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out << write(loc,id,buffer);
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}
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private:
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char_type const *plural() const
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{
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if(c_plural_)
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return c_plural_;
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if(plural_.empty())
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return 0;
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return plural_.c_str();
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}
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char_type const *context() const
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{
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if(c_context_)
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return c_context_;
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if(context_.empty())
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return 0;
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return context_.c_str();
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}
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char_type const *id() const
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{
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return c_id_ ? c_id_ : id_.c_str();
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}
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char_type const *write(std::locale const &loc,int domain_id,string_type &buffer) const
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{
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char_type const *translated = 0;
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static const char_type empty_string[1] = {0};
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char_type const *id = this->id();
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char_type const *context = this->context();
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char_type const *plural = this->plural();
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if(*id == 0)
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return empty_string;
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facet_type const *facet = 0;
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if(std::has_facet<facet_type>(loc))
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facet = &std::use_facet<facet_type>(loc);
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if(facet) {
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if(!plural) {
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translated = facet->get(domain_id,context,id);
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}
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else {
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translated = facet->get(domain_id,context,id,n_);
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}
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}
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if(!translated) {
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char_type const *msg = plural ? ( n_ == 1 ? id : plural) : id;
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if(facet) {
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translated = facet->convert(msg,buffer);
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}
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else {
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translated = details::string_cast_traits<char_type>::cast(msg,buffer);
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}
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}
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return translated;
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}
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/// members
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int n_;
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char_type const *c_id_;
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char_type const *c_context_;
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char_type const *c_plural_;
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string_type id_;
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string_type context_;
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string_type plural_;
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};
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///
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/// Convenience typedef for char
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///
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typedef basic_message<char> message;
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///
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/// Convenience typedef for wchar_t
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///
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typedef basic_message<wchar_t> wmessage;
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#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
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///
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/// Convenience typedef for char16_t
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///
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typedef basic_message<char16_t> u16message;
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#endif
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#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
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///
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/// Convenience typedef for char32_t
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///
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typedef basic_message<char32_t> u32message;
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#endif
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///
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/// Translate message \a msg and write it to stream
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///
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template<typename CharType>
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std::basic_ostream<CharType> &operator<<(std::basic_ostream<CharType> &out,basic_message<CharType> const &msg)
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{
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msg.write(out);
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return out;
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}
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///
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/// \anchor boost_locale_translate_family \name Indirect message translation function family
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/// @{
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///
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/// \brief Translate a message, \a msg is not copied
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///
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template<typename CharType>
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inline basic_message<CharType> translate(CharType const *msg)
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{
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return basic_message<CharType>(msg);
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}
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///
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/// \brief Translate a message in context, \a msg and \a context are not copied
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///
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template<typename CharType>
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inline basic_message<CharType> translate( CharType const *context,
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CharType const *msg)
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{
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return basic_message<CharType>(context,msg);
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}
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///
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/// \brief Translate a plural message form, \a single and \a plural are not copied
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///
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template<typename CharType>
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inline basic_message<CharType> translate( CharType const *single,
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CharType const *plural,
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int n)
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{
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return basic_message<CharType>(single,plural,n);
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}
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///
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/// \brief Translate a plural message from in constext, \a context, \a single and \a plural are not copied
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///
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template<typename CharType>
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inline basic_message<CharType> translate( CharType const *context,
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CharType const *single,
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CharType const *plural,
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int n)
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{
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return basic_message<CharType>(context,single,plural,n);
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}
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///
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/// \brief Translate a message, \a msg is copied
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///
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template<typename CharType>
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inline basic_message<CharType> translate(std::basic_string<CharType> const &msg)
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{
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return basic_message<CharType>(msg);
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}
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///
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/// \brief Translate a message in context,\a context and \a msg is copied
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///
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template<typename CharType>
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inline basic_message<CharType> translate( std::basic_string<CharType> const &context,
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std::basic_string<CharType> const &msg)
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{
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return basic_message<CharType>(context,msg);
|
|
}
|
|
///
|
|
/// \brief Translate a plural message form in constext, \a context, \a single and \a plural are copied
|
|
///
|
|
template<typename CharType>
|
|
inline basic_message<CharType> translate( std::basic_string<CharType> const &context,
|
|
std::basic_string<CharType> const &single,
|
|
std::basic_string<CharType> const &plural,
|
|
int n)
|
|
{
|
|
return basic_message<CharType>(context,single,plural,n);
|
|
}
|
|
|
|
///
|
|
/// \brief Translate a plural message form, \a single and \a plural are copied
|
|
///
|
|
|
|
template<typename CharType>
|
|
inline basic_message<CharType> translate( std::basic_string<CharType> const &single,
|
|
std::basic_string<CharType> const &plural,
|
|
int n)
|
|
{
|
|
return basic_message<CharType>(single,plural,n);
|
|
}
|
|
|
|
/// @}
|
|
|
|
///
|
|
/// \anchor boost_locale_gettext_family \name Direct message translation functions family
|
|
///
|
|
|
|
///
|
|
/// Translate message \a id according to locale \a loc
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> gettext(CharType const *id,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(id).str(loc);
|
|
}
|
|
///
|
|
/// Translate plural form according to locale \a loc
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> ngettext( CharType const *s,
|
|
CharType const *p,
|
|
int n,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(s,p,n).str(loc);
|
|
}
|
|
///
|
|
/// Translate message \a id according to locale \a loc in domain \a domain
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> dgettext( char const *domain,
|
|
CharType const *id,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(id).str(loc,domain);
|
|
}
|
|
|
|
///
|
|
/// Translate plural form according to locale \a loc in domain \a domain
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> dngettext( char const *domain,
|
|
CharType const *s,
|
|
CharType const *p,
|
|
int n,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(s,p,n).str(loc,domain);
|
|
}
|
|
///
|
|
/// Translate message \a id according to locale \a loc in context \a context
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> pgettext( CharType const *context,
|
|
CharType const *id,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(context,id).str(loc);
|
|
}
|
|
///
|
|
/// Translate plural form according to locale \a loc in context \a context
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> npgettext( CharType const *context,
|
|
CharType const *s,
|
|
CharType const *p,
|
|
int n,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(context,s,p,n).str(loc);
|
|
}
|
|
///
|
|
/// Translate message \a id according to locale \a loc in domain \a domain in context \a context
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> dpgettext( char const *domain,
|
|
CharType const *context,
|
|
CharType const *id,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(context,id).str(loc,domain);
|
|
}
|
|
///
|
|
/// Translate plural form according to locale \a loc in domain \a domain in context \a context
|
|
///
|
|
template<typename CharType>
|
|
std::basic_string<CharType> dnpgettext(char const *domain,
|
|
CharType const *context,
|
|
CharType const *s,
|
|
CharType const *p,
|
|
int n,
|
|
std::locale const &loc=std::locale())
|
|
{
|
|
return basic_message<CharType>(context,s,p,n).str(loc,domain);
|
|
}
|
|
|
|
///
|
|
/// \cond INTERNAL
|
|
///
|
|
|
|
template<>
|
|
struct BOOST_LOCALE_DECL base_message_format<char> : public std::locale::facet
|
|
{
|
|
base_message_format(size_t refs = 0) : std::locale::facet(refs)
|
|
{
|
|
}
|
|
static std::locale::id id;
|
|
};
|
|
|
|
template<>
|
|
struct BOOST_LOCALE_DECL base_message_format<wchar_t> : public std::locale::facet
|
|
{
|
|
base_message_format(size_t refs = 0) : std::locale::facet(refs)
|
|
{
|
|
}
|
|
static std::locale::id id;
|
|
};
|
|
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR16_T
|
|
|
|
template<>
|
|
struct BOOST_LOCALE_DECL base_message_format<char16_t> : public std::locale::facet
|
|
{
|
|
base_message_format(size_t refs = 0) : std::locale::facet(refs)
|
|
{
|
|
}
|
|
static std::locale::id id;
|
|
};
|
|
|
|
#endif
|
|
|
|
#ifdef BOOST_LOCALE_ENABLE_CHAR32_T
|
|
|
|
template<>
|
|
struct BOOST_LOCALE_DECL base_message_format<char32_t> : public std::locale::facet
|
|
{
|
|
base_message_format(size_t refs = 0) : std::locale::facet(refs)
|
|
{
|
|
}
|
|
static std::locale::id id;
|
|
};
|
|
|
|
#endif
|
|
|
|
/// \endcond
|
|
|
|
///
|
|
/// @}
|
|
///
|
|
|
|
namespace as {
|
|
/// \cond INTERNAL
|
|
namespace details {
|
|
struct set_domain {
|
|
std::string domain_id;
|
|
};
|
|
template<typename CharType>
|
|
std::basic_ostream<CharType> &operator<<(std::basic_ostream<CharType> &out, set_domain const &dom)
|
|
{
|
|
int id = std::use_facet<message_format<CharType> >(out.getloc()).domain(dom.domain_id);
|
|
ios_info::get(out).domain_id(id);
|
|
return out;
|
|
}
|
|
} // details
|
|
/// \endcond
|
|
|
|
///
|
|
/// \addtogroup manipulators
|
|
///
|
|
/// @{
|
|
|
|
///
|
|
/// Manipulator for switching message domain in ostream,
|
|
///
|
|
/// \note The returned object throws std::bad_cast if the I/O stream does not have \ref message_format facet installed
|
|
///
|
|
inline
|
|
#ifdef BOOST_LOCALE_DOXYGEN
|
|
unspecified_type
|
|
#else
|
|
details::set_domain
|
|
#endif
|
|
domain(std::string const &id)
|
|
{
|
|
details::set_domain tmp = { id };
|
|
return tmp;
|
|
}
|
|
/// @}
|
|
} // as
|
|
} // locale
|
|
} // boost
|
|
|
|
#ifdef BOOST_MSVC
|
|
#pragma warning(pop)
|
|
#endif
|
|
|
|
|
|
#endif
|
|
|
|
// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4
|
|
|