i2pd/i18n/I18N.h

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/*
* Copyright (c) 2021-2023, The PurpleI2P Project
*
* This file is part of Purple i2pd project and licensed under BSD3
*
* See full license text in LICENSE file at top of project tree
*/
#ifndef __I18N_H__
#define __I18N_H__
#include <string>
#include <map>
#include <utility>
#include <functional>
namespace i2p
{
namespace i18n
{
class Locale
{
public:
Locale (
const std::string& language,
const std::map<std::string, std::string>& strings,
const std::map<std::string, std::vector<std::string>>& plurals,
std::function<int(int)> formula
): m_Language (language), m_Strings (strings), m_Plurals (plurals), m_Formula (formula) { };
// Get activated language name for webconsole
std::string GetLanguage() const
{
return m_Language;
}
std::string GetString (const std::string& arg) const
{
const auto it = m_Strings.find(arg);
if (it == m_Strings.end())
{
return arg;
}
else
{
return it->second;
}
}
std::string GetPlural (const std::string& arg, const std::string& arg2, const int& n) const
{
const auto it = m_Plurals.find(arg2);
if (it == m_Plurals.end()) // not found, fallback to english
{
return n == 1 ? arg : arg2;
}
else
{
int form = m_Formula(n);
return it->second[form];
}
}
private:
const std::string m_Language;
const std::map<std::string, std::string> m_Strings;
const std::map<std::string, std::vector<std::string>> m_Plurals;
std::function<int(int)> m_Formula;
};
void SetLanguage(const std::string &lang);
std::string translate (const std::string& arg);
std::string translate (const std::string& arg, const std::string& arg2, const int& n);
} // i18n
} // i2p
/**
* @brief Get translation of string
* @param arg String with message
*/
template<typename TValue>
std::string tr (TValue&& arg)
{
return i2p::i18n::translate(std::forward<TValue>(arg));
}
/**
* @brief Get translation of string and format it
* @param arg String with message
* @param args Array of arguments for string formatting
*/
template<typename TValue, typename... TArgs>
std::string tr (TValue&& arg, TArgs&&... args)
{
std::string tr_str = i2p::i18n::translate(std::forward<TValue>(arg));
size_t size = std::snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
std::string str(size, 0);
std::snprintf(&str.front(), size + 1, tr_str.c_str(), std::forward<TArgs>(args)...);
return str;
}
/**
* @brief Get translation of string with plural forms
* @param arg String with message in singular form
* @param arg2 String with message in plural form
* @param n Integer, used for selection of form
*/
template<typename TValue, typename TValue2>
std::string ntr (TValue&& arg, TValue2&& arg2, int& n)
{
return i2p::i18n::translate(std::forward<TValue>(arg), std::forward<TValue2>(arg2), std::forward<int>(n));
}
/**
* @brief Get translation of string with plural forms and format it
* @param arg String with message in singular form
* @param arg2 String with message in plural form
* @param n Integer, used for selection of form
* @param args Array of arguments for string formatting
*/
template<typename TValue, typename TValue2, typename... TArgs>
std::string ntr (TValue&& arg, TValue2&& arg2, int& n, TArgs&&... args)
{
std::string tr_str = i2p::i18n::translate(std::forward<TValue>(arg), std::forward<TValue2>(arg2), std::forward<int>(n));
size_t size = std::snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
std::string str(size, 0);
std::snprintf(&str.front(), size + 1, tr_str.c_str(), std::forward<TArgs>(args)...);
return str;
}
#endif // __I18N_H__