Struct icu::locale::subtags::Language

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pub struct Language(/* private fields */);
Expand description

A language subtag (examples: "en", "csb", "zh", "und", etc.)

Language represents a Unicode base language code conformant to the unicode_language_id field of the Language and Locale Identifier.

§Examples

use icu::locale::subtags::Language;

let language: Language =
    "en".parse().expect("Failed to parse a language subtag.");

If the Language has no value assigned, it serializes to a string "und", which can be then parsed back to an empty Language field.

§Examples

use icu::locale::subtags::Language;

assert_eq!(Language::default().as_str(), "und");

Notice: ICU4X uses a narrow form of language subtag of 2-3 characters. The specification allows language subtag to optionally also be 5-8 characters but that form has not been used and ICU4X does not support it right now.

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impl Language

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pub const fn try_from_str(s: &str) -> Result<Language, ParseError>

A constructor which takes a str slice, parses it and produces a well-formed Language.

§Examples
use icu_locale_core::subtags ::Language;

assert!(Language::try_from_str("en").is_ok());
assert!(Language::try_from_str("419").is_err());
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pub const fn try_from_utf8(code_units: &[u8]) -> Result<Language, ParseError>

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pub const fn try_from_raw(raw: [u8; 3]) -> Result<Language, ParseError>

Safely creates a Language from its raw format as returned by Self::into_raw. Unlike Self::try_from_utf8, this constructor only takes normalized values.

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pub const unsafe fn from_raw_unchecked(v: [u8; 3]) -> Language

Unsafely creates a Language from its raw format as returned by Self::into_raw. Unlike Self::try_from_utf8, this constructor only takes normalized values.

§Safety

This function is safe iff Self::try_from_raw returns an Ok. This is the case for inputs that are correctly normalized.

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pub const fn into_raw(self) -> [u8; 3]

Deconstructs into a raw format to be consumed by from_raw_unchecked or try_from_raw.

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pub const fn as_str(&self) -> &str

A helper function for displaying as a &str.

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pub fn strict_cmp(self, other: &[u8]) -> Ordering

Compare with BCP-47 bytes.

The return value is equivalent to what would happen if you first converted self to a BCP-47 string and then performed a byte comparison.

This function is case-sensitive and results in a total order, so it is appropriate for binary search. The only argument producing Ordering::Equal is self.as_str().as_bytes().

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pub fn normalizing_eq(self, other: &str) -> bool

Compare with a potentially unnormalized BCP-47 string.

The return value is equivalent to what would happen if you first parsed the BCP-47 string and then performed a structural comparison.

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impl Language

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pub fn to_string(&self) -> String

Converts the given value to a String.

Under the hood, this uses an efficient [Writeable] implementation. However, in order to avoid allocating a string, it is more efficient to use [Writeable] directly.

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impl Language

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pub const UND: Language = _

The default undefined language “und”. Same as default().

§Examples
use icu::locale::subtags::Language;

assert_eq!(Language::default(), Language::UND);
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pub const fn default() -> Language

Const-friendly version of Default::default.

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pub const fn is_default(self) -> bool

Tests if the Language subtag is the default one ("und").

Trait Implementations§

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impl AsULE for Language

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type ULE = Language

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

Converts from Self to Self::ULE. Read more
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fn from_unaligned(unaligned: <Language as AsULE>::ULE) -> Language

Converts from Self::ULE to Self. Read more
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impl Bake for Language

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fn bake(&self, env: &CrateEnv) -> TokenStream

Returns a TokenStream that would evaluate to self. Read more
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impl BakeSize for Language

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fn borrows_size(&self) -> usize

Returns the size
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impl Clone for Language

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fn clone(&self) -> Language

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 Language

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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 Language

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fn default() -> Language

Returns the “default value” for a type. Read more
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impl<'de> Deserialize<'de> for Language

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fn deserialize<D>( deserializer: D, ) -> Result<Language, <D as Deserializer<'de>>::Error>
where D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl Display for Language

This trait is implemented for compatibility with fmt!. To create a string, [Writeable::write_to_string] is usually more efficient.

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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<'l> From<&'l Language> for &'l str

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fn from(input: &'l Language) -> &'l str

Converts to this type from the input type.
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impl From<Language> for LanguageIdentifier

§Examples

use icu::locale::{langid, subtags::language, LanguageIdentifier};

assert_eq!(LanguageIdentifier::from(language!("en")), langid!("en"));
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fn from(language: Language) -> LanguageIdentifier

Converts to this type from the input type.
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impl From<Language> for Locale

§Examples

use icu::locale::Locale;
use icu::locale::{locale, subtags::language};

assert_eq!(Locale::from(language!("en")), locale!("en"));
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fn from(language: Language) -> Locale

Converts to this type from the input type.
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impl From<Language> for TinyAsciiStr<3>

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fn from(input: Language) -> TinyAsciiStr<3>

Converts to this type from the input type.
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impl FromStr for Language

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type Err = ParseError

The associated error which can be returned from parsing.
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fn from_str(s: &str) -> Result<Language, <Language as FromStr>::Err>

Parses a string s to return a value of this type. Read more
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impl Hash for Language

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

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 NicheBytes<3> for Language

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const NICHE_BIT_PATTERN: [u8; 3] = tinystr::TinyAsciiStr<3>::NICHE_BIT_PATTERN

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impl Ord for Language

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fn cmp(&self, other: &Language) -> 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 Language

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

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

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 Language

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fn partial_cmp(&self, other: &Language) -> 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

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

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

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

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl Serialize for Language

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fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl ULE for Language

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fn validate_bytes(bytes: &[u8]) -> Result<(), UleError>

Validates a byte slice, &[u8]. Read more
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fn parse_bytes_to_slice(bytes: &[u8]) -> Result<&[Self], UleError>

Parses a byte slice, &[u8], and return it as &[Self] with the same lifetime. Read more
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unsafe fn slice_from_bytes_unchecked(bytes: &[u8]) -> &[Self]

Takes a byte slice, &[u8], and return it as &[Self] with the same lifetime, assuming that this byte slice has previously been run through Self::parse_bytes_to_slice() with success. Read more
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fn slice_as_bytes(slice: &[Self]) -> &[u8]

Given &[Self], returns a &[u8] with the same lifetime. Read more
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impl Writeable for Language

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fn write_to<W>(&self, sink: &mut W) -> Result<(), Error>
where W: Write + ?Sized,

Writes a string to the given sink. Errors from the sink are bubbled up. The default implementation delegates to write_to_parts, and discards any Part annotations.
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fn writeable_length_hint(&self) -> LengthHint

Returns a hint for the number of UTF-8 bytes that will be written to the sink. Read more
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fn write_to_string(&self) -> Cow<'_, str>

Creates a new String with the data from this Writeable. Like ToString, but smaller and faster. Read more
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fn write_to_parts<S>(&self, sink: &mut S) -> Result<(), Error>
where S: PartsWrite + ?Sized,

Write bytes and Part annotations to the given sink. Errors from the sink are bubbled up. The default implementation delegates to write_to, and doesn’t produce any Part annotations.
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impl<'a> ZeroMapKV<'a> for Language

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type Container = ZeroVec<'a, Language>

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

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type GetType = Language

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

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 Language

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impl Eq for Language

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impl StructuralPartialEq for Language

Auto Trait Implementations§

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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> GetField<T> for T
where T: Copy,

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fn get_field(&self) -> T

Returns the value of this trait’s field T.
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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> Serialize for T
where T: Serialize + ?Sized,

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fn erased_serialize(&self, serializer: &mut dyn Serializer) -> Result<Ok, Error>

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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> ToString for T
where T: Display + ?Sized,

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default fn to_string(&self) -> String

Converts the given value to a String. 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> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,

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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,