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/*
* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/StringView.h>
#include <AK/Types.h>
#include <LibLocale/Forward.h>
namespace Locale {
enum class PluralForm {
Cardinal,
Ordinal,
};
enum class PluralCategory : u8 {
Other,
Zero,
One,
Two,
Few,
Many,
// https://unicode.org/reports/tr35/tr35-numbers.html#Explicit_0_1_rules
ExactlyZero,
ExactlyOne,
};
// https://unicode.org/reports/tr35/tr35-numbers.html#Plural_Operand_Meanings
struct PluralOperands {
static constexpr StringView symbol_to_variable_name(char symbol)
{
if (symbol == 'n')
return "number"sv;
if (symbol == 'i')
return "integer_digits"sv;
if (symbol == 'f')
return "fraction_digits"sv;
if (symbol == 'v')
return "number_of_fraction_digits"sv;
if (symbol == 't')
return "fraction_digits_without_trailing"sv;
if (symbol == 'w')
return "number_of_fraction_digits_without_trailing"sv;
VERIFY_NOT_REACHED();
}
static constexpr bool symbol_requires_floating_point_modulus(char symbol)
{
// From TR-35: "The modulus (% or mod) is a remainder operation as defined in Java; for
// example, where n = 4.3 the result of n mod 3 is 1.3."
//
// So, this returns whether the symbol represents a decimal value, and thus requires fmod.
return symbol == 'n';
}
double number { 0 };
u64 integer_digits { 0 };
u64 fraction_digits { 0 };
u64 number_of_fraction_digits { 0 };
u64 fraction_digits_without_trailing { 0 };
u64 number_of_fraction_digits_without_trailing { 0 };
};
PluralForm plural_form_from_string(StringView plural_form);
StringView plural_form_to_string(PluralForm plural_form);
// NOTE: This must be defined inline to be callable from the code generators.
constexpr PluralCategory plural_category_from_string(StringView category)
{
if (category == "other"sv)
return PluralCategory::Other;
if (category == "zero"sv)
return PluralCategory::Zero;
if (category == "one"sv)
return PluralCategory::One;
if (category == "two"sv)
return PluralCategory::Two;
if (category == "few"sv)
return PluralCategory::Few;
if (category == "many"sv)
return PluralCategory::Many;
if (category == "0"sv)
return PluralCategory::ExactlyZero;
if (category == "1"sv)
return PluralCategory::ExactlyOne;
VERIFY_NOT_REACHED();
}
// NOTE: This must be defined inline to be callable from the code generators.
constexpr StringView plural_category_to_string(PluralCategory category)
{
switch (category) {
case PluralCategory::Other:
return "other"sv;
case PluralCategory::Zero:
return "zero"sv;
case PluralCategory::One:
return "one"sv;
case PluralCategory::Two:
return "two"sv;
case PluralCategory::Few:
return "few"sv;
case PluralCategory::Many:
return "many"sv;
case PluralCategory::ExactlyZero:
return "0"sv;
case PluralCategory::ExactlyOne:
return "1"sv;
}
VERIFY_NOT_REACHED();
}
PluralCategory determine_plural_category(StringView locale, PluralForm form, PluralOperands operands);
ReadonlySpan<PluralCategory> available_plural_categories(StringView locale, PluralForm form);
PluralCategory determine_plural_range(StringView locale, PluralCategory start, PluralCategory end);
}
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