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/*
* Copyright (c) 2022, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Variant.h>
#include <LibJS/Runtime/Intl/PluralRules.h>
#include <math.h>
#include <stdlib.h>
namespace JS::Intl {
// 16 PluralRules Objects, https://tc39.es/ecma402/#pluralrules-objects
PluralRules::PluralRules(Object& prototype)
: NumberFormatBase(prototype)
{
}
// 16.5.1 GetOperands ( s ), https://tc39.es/ecma402/#sec-getoperands
Unicode::PluralOperands get_operands(String const& string)
{
// 1.Let n be ! ToNumber(s).
char* end { nullptr };
auto number = strtod(string.characters(), &end);
VERIFY(!*end);
// 2. Assert: n is finite.
VERIFY(isfinite(number));
// 3. Let dp be StringIndexOf(s, ".", 0).
auto decimal_point = string.find('.');
Variant<Empty, double, StringView> integer_part;
StringView fraction_slice;
// 4. If dp = -1, then
if (!decimal_point.has_value()) {
// a. Let intPart be n.
integer_part = number;
// b. Let fracSlice be "".
}
// 5. Else,
else {
// a. Let intPart be the substring of s from 0 to dp.
integer_part = string.substring_view(0, *decimal_point);
// b. Let fracSlice be the substring of s from dp + 1.
fraction_slice = string.substring_view(*decimal_point + 1);
}
// 6. Let i be abs(! ToNumber(intPart)).
auto integer = integer_part.visit(
[](Empty) -> u64 { VERIFY_NOT_REACHED(); },
[](double value) {
return static_cast<u64>(fabs(value));
},
[](StringView value) {
auto value_as_int = value.template to_int<i64>().value();
return static_cast<u64>(value_as_int);
});
// 7. Let fracDigitCount be the length of fracSlice.
auto fraction_digit_count = fraction_slice.length();
// 8. Let f be ! ToNumber(fracSlice).
auto fraction = fraction_slice.is_empty() ? 0u : fraction_slice.template to_uint<u64>().value();
// 9. Let significantFracSlice be the value of fracSlice stripped of trailing "0".
auto significant_fraction_slice = fraction_slice.trim("0"sv, TrimMode::Right);
// 10. Let significantFracDigitCount be the length of significantFracSlice.
auto significant_fraction_digit_count = significant_fraction_slice.length();
// 11. Let significantFrac be ! ToNumber(significantFracSlice).
auto significant_fraction = significant_fraction_slice.is_empty() ? 0u : significant_fraction_slice.template to_uint<u64>().value();
// 12. Return a new Record { [[Number]]: abs(n), [[IntegerDigits]]: i, [[FractionDigits]]: f, [[NumberOfFractionDigits]]: fracDigitCount, [[FractionDigitsWithoutTrailing]]: significantFrac, [[NumberOfFractionDigitsWithoutTrailing]]: significantFracDigitCount }.
return Unicode::PluralOperands {
.number = fabs(number),
.integer_digits = integer,
.fraction_digits = fraction,
.number_of_fraction_digits = fraction_digit_count,
.fraction_digits_without_trailing = significant_fraction,
.number_of_fraction_digits_without_trailing = significant_fraction_digit_count,
};
}
// 16.5.2 PluralRuleSelect ( locale, type, n, operands ), https://tc39.es/ecma402/#sec-pluralruleselect
Unicode::PluralCategory plural_rule_select(StringView locale, Unicode::PluralForm type, Value, Unicode::PluralOperands operands)
{
return Unicode::determine_plural_category(locale, type, move(operands));
}
// 16.5.3 ResolvePlural ( pluralRules, n ), https://tc39.es/ecma402/#sec-resolveplural
Unicode::PluralCategory resolve_plural(GlobalObject& global_object, PluralRules const& plural_rules, Value number)
{
return resolve_plural(global_object, plural_rules, plural_rules.type(), number);
}
// Non-standard overload of ResolvePlural to allow using the AO without an Intl.PluralRules object.
Unicode::PluralCategory resolve_plural(GlobalObject& global_object, NumberFormatBase const& number_format, Unicode::PluralForm type, Value number)
{
// 1. Assert: Type(pluralRules) is Object.
// 2. Assert: pluralRules has an [[InitializedPluralRules]] internal slot.
// 3. Assert: Type(n) is Number.
// 4. If n is not a finite Number, then
if (!number.is_finite_number()) {
// a. Return "other".
return Unicode::PluralCategory::Other;
}
// 5. Let locale be pluralRules.[[Locale]].
auto const& locale = number_format.locale();
// 6. Let type be pluralRules.[[Type]].
// 7. Let res be ! FormatNumericToString(pluralRules, n).
auto result = format_numeric_to_string(global_object, number_format, number);
// 8. Let s be res.[[FormattedString]].
auto const& string = result.formatted_string;
// 9. Let operands be ! GetOperands(s).
auto operands = get_operands(string);
// 10. Return ! PluralRuleSelect(locale, type, n, operands).
return plural_rule_select(locale, type, number, move(operands));
}
// 1.1.5 PluralRuleSelectRange ( locale, type, xp, yp ), https://tc39.es/proposal-intl-numberformat-v3/out/pluralrules/proposed.html#sec-pluralruleselectrange
Unicode::PluralCategory plural_rule_select_range(StringView locale, Unicode::PluralForm, Unicode::PluralCategory start, Unicode::PluralCategory end)
{
return Unicode::determine_plural_range(locale, start, end);
}
// 1.1.6 ResolvePluralRange ( pluralRules, x, y ), https://tc39.es/proposal-intl-numberformat-v3/out/pluralrules/proposed.html#sec-resolvepluralrange
ThrowCompletionOr<Unicode::PluralCategory> resolve_plural_range(GlobalObject& global_object, PluralRules const& plural_rules, Value start, Value end)
{
auto& vm = global_object.vm();
// 1. Assert: Type(pluralRules) is Object.
// 2. Assert: pluralRules has an [[InitializedPluralRules]] internal slot.
// 3. Assert: Type(x) is Number.
// 4. Assert: Type(y) is Number.
// 5. If x is NaN or y is NaN, throw a RangeError exception.
if (start.is_nan())
return vm.throw_completion<RangeError>(global_object, ErrorType::IntlNumberIsNaN, "start"sv);
if (end.is_nan())
return vm.throw_completion<RangeError>(global_object, ErrorType::IntlNumberIsNaN, "end"sv);
// 6. If x > y, throw a RangeError exception.
if (start.as_double() > end.as_double())
return vm.throw_completion<RangeError>(global_object, ErrorType::IntlStartRangeAfterEndRange, start, end);
// 7. Let xp be ! ResolvePlural(pluralRules, x).
auto start_plurality = resolve_plural(global_object, plural_rules, start);
// 8. Let yp be ! ResolvePlural(pluralRules, y).
auto end_plurality = resolve_plural(global_object, plural_rules, end);
// 9. Let locale be pluralRules.[[Locale]].
auto const& locale = plural_rules.locale();
// 10. Let type be pluralRules.[[Type]].
auto type = plural_rules.type();
// 11. Return ! PluralRuleSelectRange(locale, type, xp, yp).
return plural_rule_select_range(locale, type, start_plurality, end_plurality);
}
}
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