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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// This file declares a helper class for selecting a supported language from a
// set of candidates.
#ifndef BASE_WIN_EMBEDDED_I18N_LANGUAGE_SELECTOR_H_
#define BASE_WIN_EMBEDDED_I18N_LANGUAGE_SELECTOR_H_
#include <string>
#include <string_view>
#include <utility>
#include <vector>
#include "base/base_export.h"
#include "base/compiler_specific.h"
#include "base/containers/span.h"
namespace base {
namespace win {
namespace i18n {
// Selects a language from a set of available translations based on the user's
// preferred language list. An optional preferred language may be provided to
// override selection should a corresponding translation be available.
class BASE_EXPORT LanguageSelector {
public:
using LangToOffset = std::pair<std::wstring_view, size_t>;
// Constructor to be used for users of this class that will provide the actual
// language offsets that will be used.
// |preferred_language| is an optional language used to as higher priority
// language when determining the matched language. This languages will
// take precedence over the system defined languages.
// |languages_to_offset_begin| and |languages_to_offset_end| point to a sorted
// array of language identifiers (and their offsets) for which translations
// are available.
LanguageSelector(std::wstring_view preferred_language,
span<const LangToOffset> languages_to_offset);
// Constructor for testing purposes.
// |candidates| is a list of all candidate languages that can be used to
// determine which language to use.
// |languages_to_offset_begin| and |languages_to_offset_end| point to a sorted
// array of language identifiers (and their offsets) for which translations
// are available.
LanguageSelector(const std::vector<std::wstring>& candidates,
span<const LangToOffset> languages_to_offset);
LanguageSelector(const LanguageSelector&) = delete;
LanguageSelector& operator=(const LanguageSelector&) = delete;
~LanguageSelector();
// The offset of the matched language (i.e., IDS_L10N_OFFSET_*).
size_t offset() const { return selected_offset_; }
// The full name of the candidate language for which a match was found.
const std::wstring& matched_candidate() const LIFETIME_BOUND {
return matched_candidate_;
}
// The name of the selected translation.
const std::wstring& selected_translation() const LIFETIME_BOUND {
return selected_language_;
}
private:
std::wstring matched_candidate_;
std::wstring selected_language_;
size_t selected_offset_;
};
} // namespace i18n
} // namespace win
} // namespace base
#endif // BASE_WIN_EMBEDDED_I18N_LANGUAGE_SELECTOR_H_
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