Enum icu_plurals::PluralCategory

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#[repr(u8)]
pub enum PluralCategory { Zero = 0, One = 1, Two = 2, Few = 3, Many = 4, Other = 5, }
Expand description

The plural categories are used to format messages with numeric placeholders, expressed as decimal numbers.

The fundamental rule for determining plural categories is the existence of minimal pairs: whenever two different numbers may require different versions of the same message, then the numbers have different plural categories.

All languages supported by ICU4X can match any number to one of the categories.

§Examples

use icu::locid::locale;
use icu::plurals::{PluralCategory, PluralRuleType, PluralRules};

let pr =
    PluralRules::try_new(&locale!("en").into(), PluralRuleType::Cardinal)
        .expect("locale should be present");

assert_eq!(pr.category_for(5_usize), PluralCategory::Other);

Variants§

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Zero = 0

CLDR “zero” plural category. Used in Arabic and Latvian, among others.

Examples of numbers having this category:

  • 0 in Arabic (ar), Latvian (lv)
  • 10~20, 30, 40, 50, … in Latvian (lv)
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One = 1

CLDR “one” plural category. Signifies the singular form in many languages.

Examples of numbers having this category:

  • 0 in French (fr), Portuguese (pt), …
  • 1 in English (en) and most other languages
  • 2.1 in Filipino (fil), Croatian (hr), Latvian (lv), Serbian (sr)
  • 2, 3, 5, 7, 8, … in Filipino (fil)
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Two = 2

CLDR “two” plural category. Used in Arabic, Hebrew, and Slovenian, among others.

Examples of numbers having this category:

  • 2 in Arabic (ar), Hebrew (iw), Slovenian (sl)
  • 2.0 in Arabic (ar)
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Few = 3

CLDR “few” plural category. Used in Romanian, Polish, Russian, and others.

Examples of numbers having this category:

  • 0 in Romanian (ro)
  • 1.2 in Croatian (hr), Romanian (ro), Slovenian (sl), Serbian (sr)
  • 2 in Polish (pl), Russian (ru), Czech (cs), …
  • 5 in Arabic (ar), Lithuanian (lt), Romanian (ro)
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Many = 4

CLDR “many” plural category. Used in Polish, Russian, Ukrainian, and others.

Examples of numbers having this category:

  • 0 in Polish (pl)
  • 1.0 in Czech (cs), Slovak (sk)
  • 1.1 in Czech (cs), Lithuanian (lt), Slovak (sk)
  • 15 in Arabic (ar), Polish (pl), Russian (ru), Ukrainian (uk)
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Other = 5

CLDR “other” plural category, used as a catch-all. Each language supports it, and it is also used as a fail safe result for in case no better match can be identified.

In some languages, such as Japanese, Chinese, Korean, and Thai, this is the only plural category.

Examples of numbers having this category:

  • 0 in English (en), German (de), Spanish (es), …
  • 1 in Japanese (ja), Korean (ko), Chinese (zh), Thai (th), …
  • 2 in English (en), German (de), Spanish (es), …

Implementations§

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impl PluralCategory

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pub(crate) fn new_from_u8(value: u8) -> Option<Self>

Attempt to construct the value from its corresponding integer, returning None if not possible

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impl PluralCategory

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pub fn all() -> impl ExactSizeIterator<Item = Self>

Returns an ordered iterator over variants of Plural Categories.

Categories are returned in alphabetical order.

§Examples
use icu::plurals::PluralCategory;

let mut categories = PluralCategory::all();

assert_eq!(categories.next(), Some(PluralCategory::Few));
assert_eq!(categories.next(), Some(PluralCategory::Many));
assert_eq!(categories.next(), Some(PluralCategory::One));
assert_eq!(categories.next(), Some(PluralCategory::Other));
assert_eq!(categories.next(), Some(PluralCategory::Two));
assert_eq!(categories.next(), Some(PluralCategory::Zero));
assert_eq!(categories.next(), None);
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pub fn get_for_cldr_string(category: &str) -> Option<PluralCategory>

Returns the PluralCategory corresponding to given TR35 string.

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pub fn get_for_cldr_bytes(category: &[u8]) -> Option<PluralCategory>

Returns the PluralCategory corresponding to given TR35 string as bytes

Trait Implementations§

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impl AsULE for PluralCategory

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type ULE = PluralCategoryULE

The ULE type corresponding to Self. Read more
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fn to_unaligned(self) -> Self::ULE

Converts from Self to Self::ULE. Read more
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fn from_unaligned(other: Self::ULE) -> Self

Converts from Self::ULE to Self. Read more
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impl Clone for PluralCategory

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fn clone(&self) -> PluralCategory

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for PluralCategory

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Hash for PluralCategory

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fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Ord for PluralCategory

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fn cmp(&self, other: &PluralCategory) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for PluralCategory

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fn eq(&self, other: &PluralCategory) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for PluralCategory

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fn partial_cmp(&self, other: &PluralCategory) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<'a> ZeroMapKV<'a> for PluralCategory

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type Container = ZeroVec<'a, PluralCategory>

The container that can be used with this type: ZeroVec or VarZeroVec.
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type Slice = ZeroSlice<PluralCategory>

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type GetType = PluralCategoryULE

The type produced by Container::get() Read more
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type OwnedType = PluralCategory

The type produced by Container::replace() and Container::remove(), also used during deserialization. If Self is human readable serialized, deserializing to Self::OwnedType should produce the same value once passed through Self::owned_as_self() Read more
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impl Copy for PluralCategory

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impl Eq for PluralCategory

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impl StructuralPartialEq for PluralCategory

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> ErasedDestructor for T
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impl<T> MaybeSendSync for T