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fa8ef7d138
The return type of TranslateArg is std::string, which creates a copy.
Fix this by moving everything into a lambda that takes a reference and
returns a reference.
Also, the format function is called without specifying the namespace it
lives in. Fix this by specifying the namespace. See also:
7a59865793/doc/developer-notes.md (L117-L137).
79 lines
2.1 KiB
C++
79 lines
2.1 KiB
C++
// Copyright (c) 2019-2022 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_UTIL_TRANSLATION_H
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#define BITCOIN_UTIL_TRANSLATION_H
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#include <tinyformat.h>
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#include <functional>
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#include <string>
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/**
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* Bilingual messages:
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* - in GUI: user's native language + untranslated (i.e. English)
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* - in log and stderr: untranslated only
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*/
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struct bilingual_str {
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std::string original;
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std::string translated;
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bilingual_str& operator+=(const bilingual_str& rhs)
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{
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original += rhs.original;
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translated += rhs.translated;
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return *this;
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}
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bool empty() const
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{
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return original.empty();
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}
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void clear()
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{
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original.clear();
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translated.clear();
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}
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};
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inline bilingual_str operator+(bilingual_str lhs, const bilingual_str& rhs)
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{
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lhs += rhs;
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return lhs;
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}
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/** Mark a bilingual_str as untranslated */
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inline bilingual_str Untranslated(std::string original) { return {original, original}; }
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// Provide an overload of tinyformat::format which can take bilingual_str arguments.
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namespace tinyformat {
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template <typename... Args>
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bilingual_str format(const bilingual_str& fmt, const Args&... args)
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{
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const auto translate_arg{[](const auto& arg, bool translated) -> const auto& {
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if constexpr (std::is_same_v<decltype(arg), const bilingual_str&>) {
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return translated ? arg.translated : arg.original;
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} else {
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return arg;
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}
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}};
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return bilingual_str{tfm::format(fmt.original, translate_arg(args, false)...),
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tfm::format(fmt.translated, translate_arg(args, true)...)};
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}
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} // namespace tinyformat
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/** Translate a message to the native language of the user. */
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const extern std::function<std::string(const char*)> G_TRANSLATION_FUN;
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/**
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* Translation function.
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* If no translation function is set, simply return the input.
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*/
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inline bilingual_str _(const char* psz)
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{
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return bilingual_str{psz, G_TRANSLATION_FUN ? (G_TRANSLATION_FUN)(psz) : psz};
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}
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#endif // BITCOIN_UTIL_TRANSLATION_H
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