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https://github.com/RGBCube/serenity
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66 lines
2 KiB
C++
66 lines
2 KiB
C++
/*
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* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Assertions.h>
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#include <AK/StringView.h>
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#include <AK/Types.h>
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#include <LibUnicode/Forward.h>
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namespace Unicode {
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enum class PluralForm {
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Cardinal,
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Ordinal,
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};
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// https://unicode.org/reports/tr35/tr35-numbers.html#Plural_Operand_Meanings
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struct PluralOperands {
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static constexpr StringView symbol_to_variable_name(char symbol)
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{
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if (symbol == 'n')
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return "number"sv;
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if (symbol == 'i')
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return "integer_digits"sv;
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if (symbol == 'f')
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return "fraction_digits"sv;
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if (symbol == 'v')
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return "number_of_fraction_digits"sv;
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if (symbol == 't')
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return "fraction_digits_without_trailing"sv;
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if (symbol == 'w')
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return "number_of_fraction_digits_without_trailing"sv;
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VERIFY_NOT_REACHED();
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}
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static constexpr bool symbol_requires_floating_point_modulus(char symbol)
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{
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// From TR-35: "The modulus (% or mod) is a remainder operation as defined in Java; for
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// example, where n = 4.3 the result of n mod 3 is 1.3."
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//
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// So, this returns whether the symbol represents a decimal value, and thus requires fmod.
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return symbol == 'n';
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}
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double number { 0 };
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u64 integer_digits { 0 };
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u64 fraction_digits { 0 };
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u64 number_of_fraction_digits { 0 };
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u64 fraction_digits_without_trailing { 0 };
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u64 number_of_fraction_digits_without_trailing { 0 };
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};
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PluralForm plural_form_from_string(StringView plural_form);
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StringView plural_form_to_string(PluralForm plural_form);
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Optional<PluralCategory> plural_category_from_string(StringView category);
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StringView plural_category_to_string(PluralCategory category);
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PluralCategory determine_plural_category(StringView locale, PluralForm form, PluralOperands operands);
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Span<PluralCategory const> available_plural_categories(StringView locale, PluralForm form);
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}
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