Struct icu::locale::LocaleDirectionality

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pub struct LocaleDirectionality<Expander = LocaleExpander> { /* private fields */ }
Expand description

Provides methods to determine the direction of a locale.

The Expander generic parameter wraps a LocaleExpander.

§Examples

use icu::locale::{langid, Direction, LocaleDirectionality};

let ld = LocaleDirectionality::new();

assert_eq!(ld.get(&langid!("en")), Some(Direction::LeftToRight));

Implementations§

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impl LocaleDirectionality

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pub const fn new() -> LocaleDirectionality

Creates a LocaleDirectionality from compiled data.

This includes limited likely subtags data, see LocaleExpander::new().

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pub fn try_new_with_any_provider( provider: &(impl AnyProvider + ?Sized), ) -> Result<LocaleDirectionality, DataError>

A version of Self::new that uses custom data provided by an AnyProvider.

📚 Help choosing a constructor

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pub fn try_new_with_buffer_provider( provider: &(impl BufferProvider + ?Sized), ) -> Result<LocaleDirectionality, DataError>

A version of Self::new that uses custom data provided by a BufferProvider.

Enabled with the serde feature.

📚 Help choosing a constructor

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pub fn try_new_unstable<P>( provider: &P, ) -> Result<LocaleDirectionality, DataError>

A version of Self::new that uses custom data provided by a DataProvider.

📚 Help choosing a constructor

⚠️ The bounds on provider may change over time, including in SemVer minor releases.
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impl<Expander> LocaleDirectionality<Expander>
where Expander: AsRef<LocaleExpander>,

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pub const fn new_with_expander( expander: Expander, ) -> LocaleDirectionality<Expander>

Creates a LocaleDirectionality with a custom LocaleExpander and compiled data.

This allows using LocaleExpander::new_extended() with data for all locales.

§Examples
use icu::locale::{
    langid, Direction, LocaleDirectionality, LocaleExpander,
};

let ld_default = LocaleDirectionality::new();

assert_eq!(ld_default.get(&langid!("jbn")), None);

let expander = LocaleExpander::new_extended();
let ld_extended = LocaleDirectionality::new_with_expander(expander);

assert_eq!(
    ld_extended.get(&langid!("jbn")),
    Some(Direction::RightToLeft)
);
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pub fn try_new_with_expander_unstable<P>( provider: &P, expander: Expander, ) -> Result<LocaleDirectionality<Expander>, DataError>

A version of Self::new_with_expander that uses custom data provided by a DataProvider.

📚 Help choosing a constructor

⚠️ The bounds on provider may change over time, including in SemVer minor releases.
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pub fn get(&self, langid: &LanguageIdentifier) -> Option<Direction>

Returns the script direction of the given locale.

Note that the direction is a property of the script of a locale, not of the language. As such, when given a locale without an associated script tag (i.e., locale!("en") vs. locale!("en-Latn")), this method first tries to infer the script using the language and region before returning its direction.

If you already have a script struct and want to get its direction, you should use Locale::from(Some(my_script)) and call this method.

This method will return None if either a locale’s script cannot be determined, or there is no information for the script.

§Examples

Using an existing locale:

use icu::locale::{langid, Direction, LocaleDirectionality};

let ld = LocaleDirectionality::new();

assert_eq!(ld.get(&langid!("en-US")), Some(Direction::LeftToRight));

assert_eq!(ld.get(&langid!("ar")), Some(Direction::RightToLeft));

assert_eq!(ld.get(&langid!("en-Arab")), Some(Direction::RightToLeft));

assert_eq!(ld.get(&langid!("foo")), None);

Using a script directly:

use icu::locale::subtags::script;
use icu::locale::{LanguageIdentifier, Direction, LocaleDirectionality};

let ld = LocaleDirectionality::new();

assert_eq!(
    ld.get(&LanguageIdentifier::from(Some(script!("Latn")))),
    Some(Direction::LeftToRight)
);
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pub fn is_right_to_left(&self, langid: &LanguageIdentifier) -> bool

Returns whether the given locale is right-to-left.

Note that if this method returns false, the locale is either left-to-right or the LocaleDirectionality does not include data for the locale. You should use LocaleDirectionality::get if you need to differentiate between these cases.

See LocaleDirectionality::get for more information.

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pub fn is_left_to_right(&self, langid: &LanguageIdentifier) -> bool

Returns whether the given locale is left-to-right.

Note that if this method returns false, the locale is either right-to-left or the LocaleDirectionality does not include data for the locale. You should use LocaleDirectionality::get if you need to differentiate between these cases.

See LocaleDirectionality::get for more information.

Trait Implementations§

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impl<Expander> Debug for LocaleDirectionality<Expander>
where Expander: Debug,

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

Formats the value using the given formatter. Read more
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impl Default for LocaleDirectionality

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fn default() -> LocaleDirectionality

Returns the “default value” for a type. Read more

Auto Trait Implementations§

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impl<Expander> Freeze for LocaleDirectionality<Expander>
where Expander: Freeze,

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impl<Expander> RefUnwindSafe for LocaleDirectionality<Expander>
where Expander: RefUnwindSafe,

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impl<Expander> Send for LocaleDirectionality<Expander>
where Expander: Send,

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impl<Expander> Sync for LocaleDirectionality<Expander>
where Expander: Sync,

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impl<Expander> Unpin for LocaleDirectionality<Expander>
where Expander: Unpin,

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impl<Expander> UnwindSafe for LocaleDirectionality<Expander>
where Expander: UnwindSafe,

Blanket 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> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. 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

The type returned in the event of a conversion 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
where T: 'static,

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impl<T> MaybeSendSync for T
where T: Send + Sync,