gettext_plural_form.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
 
#pragma once
#include <string_view>
#include <memory>
#include <functional>
 
class GettextPluralForm
{
public:
        using NumT = unsigned long;
        using Function = std::function<NumT(NumT)>;
        using Ptr = std::shared_ptr<GettextPluralForm>;
 
        GettextPluralForm(std::wstring_view str);
 
        size_t size() const
        {
                return nplurals;
        };
 
        // Note that this function does not perform any bounds check as the number of plural
        // translations provided by the translation file may deviate from nplurals,
        NumT operator()(const NumT n) const {
                return func ? func(n) : 0;
        }
 
        operator bool() const
        {
                return nplurals > 0;
        }
 
        static Ptr parseHeaderLine(std::wstring_view str) {
                return Ptr(new GettextPluralForm(str));
        }
private:
        // The number of plural forms.
        size_t nplurals = 0;
 
        // The formula for determining the plural form based on the input value; see
        // https://www.gnu.org/software/gettext/manual/html_node/Translating-plural-forms.html
        // for details.
        Function func = nullptr;
};