[−][src]Enum icu::plurals::PluralCategory
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_macros::langid; use icu_plurals::{PluralRules, PluralRuleType, PluralCategory}; use icu_provider::InvariantDataProvider; let lid = langid!("en"); let dp = InvariantDataProvider; let pr = PluralRules::try_new(lid, &dp, PluralRuleType::Cardinal) .expect("Failed to construct a PluralRules struct."); assert_eq!(pr.select(5_usize), PluralCategory::Other);
Variants
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)
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)
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)
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)
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)
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
impl PluralCategory
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pub fn all() -> impl ExactSizeIterator
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Returns an ordered iterator over variants of Plural Categories
.
Examples
use icu_plurals::PluralCategory; let mut categories = PluralCategory::all(); assert_eq!(categories.next(), Some(&PluralCategory::Zero)); assert_eq!(categories.next(), Some(&PluralCategory::One)); assert_eq!(categories.next(), Some(&PluralCategory::Two)); assert_eq!(categories.next(), Some(&PluralCategory::Few)); assert_eq!(categories.next(), Some(&PluralCategory::Many)); assert_eq!(categories.next(), Some(&PluralCategory::Other)); assert_eq!(categories.next(), None);
Trait Implementations
impl Clone for PluralCategory
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fn clone(&self) -> PluralCategory
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fn clone_from(&mut self, source: &Self)
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impl Copy for PluralCategory
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impl Debug for PluralCategory
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impl Eq for PluralCategory
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impl Hash for PluralCategory
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fn hash<__H>(&self, state: &mut __H) where
__H: Hasher,
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__H: Hasher,
fn hash_slice<H>(data: &[Self], state: &mut H) where
H: Hasher,
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H: Hasher,
impl PartialEq<PluralCategory> for PluralCategory
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fn eq(&self, other: &PluralCategory) -> bool
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#[must_use]fn ne(&self, other: &Rhs) -> bool
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impl StructuralEq for PluralCategory
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impl StructuralPartialEq for PluralCategory
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Auto Trait Implementations
impl RefUnwindSafe for PluralCategory
impl Send for PluralCategory
impl Sync for PluralCategory
impl Unpin for PluralCategory
impl UnwindSafe for PluralCategory
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Downcast for T where
T: Any,
T: Any,
fn into_any(self: Box<T>) -> Box<dyn Any + 'static>
fn into_any_rc(self: Rc<T>) -> Rc<dyn Any + 'static>
fn as_any(&self) -> &(dyn Any + 'static)
fn as_any_mut(&mut self) -> &mut (dyn Any + 'static)
impl<T> DowncastSync for T where
T: Send + Sync + Any,
T: Send + Sync + Any,
impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,