Struct rustc_errors::LanguageIdentifier

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pub struct LanguageIdentifier {
    pub language: Language,
    pub script: Option<Script>,
    pub region: Option<Region>,
    pub(crate) variants: Option<Box<[Variant]>>,
}
Expand description

LanguageIdentifier is a core struct representing a Unicode Language Identifier.

§Examples

use unic_langid_impl::LanguageIdentifier;

let li: LanguageIdentifier = "en-US".parse()
    .expect("Failed to parse.");

assert_eq!(li.language, "en");
assert_eq!(li.script, None);
assert_eq!(li.region.as_ref().map(Into::into), Some("US"));
assert_eq!(li.variants().len(), 0);

§Parsing

Unicode recognizes three levels of standard conformance for any language identifier:

  • well-formed - syntactically correct
  • valid - well-formed and only uses registered language subtags, extensions, keywords, types…
  • canonical - valid and no deprecated codes or structure.

At the moment parsing normalizes a well-formed language identifier converting _ separators to - and adjusting casing to conform to the Unicode standard.

Any bogus subtags will cause the parsing to fail with an error. No subtag validation is performed.

§Examples:

use unic_langid_impl::LanguageIdentifier;

let li: LanguageIdentifier = "eN_latn_Us-Valencia".parse()
    .expect("Failed to parse.");

assert_eq!(li.language, "en");
assert_eq!(li.script.as_ref().map(Into::into), Some("Latn"));
assert_eq!(li.region.as_ref().map(Into::into), Some("US"));
assert_eq!(li.variants().map(|v| v.as_str()).collect::<Vec<_>>(), &["valencia"]);

Fields§

§language: Language§script: Option<Script>§region: Option<Region>§variants: Option<Box<[Variant]>>

Implementations§

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impl LanguageIdentifier

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pub fn from_bytes( v: &[u8] ) -> Result<LanguageIdentifier, LanguageIdentifierError>

A constructor which takes a utf8 slice, parses it and produces a well-formed LanguageIdentifier.

§Examples
use unic_langid_impl::LanguageIdentifier;

let li = LanguageIdentifier::from_bytes("en-US".as_bytes())
    .expect("Parsing failed.");

assert_eq!(li.to_string(), "en-US");
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pub fn from_parts( language: Language, script: Option<Script>, region: Option<Region>, variants: &[Variant] ) -> LanguageIdentifier

A constructor which takes optional subtags as AsRef<[u8]>, parses them and produces a well-formed LanguageIdentifier.

§Examples
use unic_langid_impl::LanguageIdentifier;

let li = LanguageIdentifier::from_parts(
    "fr".parse().expect("Parsing failed."),
    None,
    Some("CA".parse().expect("Parsing failed.")),
    &[]
);

assert_eq!(li.to_string(), "fr-CA");
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pub const fn from_raw_parts_unchecked( language: Language, script: Option<Script>, region: Option<Region>, variants: Option<Box<[Variant]>> ) -> LanguageIdentifier

§Unchecked

This function accepts subtags expecting variants to be deduplicated and ordered.

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pub fn into_parts( self ) -> (Language, Option<Script>, Option<Region>, Vec<Variant>)

Consumes LanguageIdentifier and produces raw internal representations of all subtags in form of u64/u32.

Primarily used for storing internal representation and restoring via from_raw_parts_unchecked.

§Examples
use unic_langid_impl::LanguageIdentifier;
use tinystr::{TinyStr8, TinyStr4};

let li: LanguageIdentifier = "en-US".parse()
    .expect("Parsing failed.");

let (lang, script, region, variants) = li.into_parts();

// let li2 = LanguageIdentifier::from_raw_parts_unchecked(
//     lang.map(|l| unsafe { TinyStr8::new_unchecked(l) }),
//    script.map(|s| unsafe { TinyStr4::new_unchecked(s) }),
//    region.map(|r| unsafe { TinyStr4::new_unchecked(r) }),
//    variants.map(|v| v.into_iter().map(|v| unsafe { TinyStr8::new_unchecked(*v) }).collect()),
//);

//assert_eq!(li2.to_string(), "en-US");
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pub fn matches<O>( &self, other: &O, self_as_range: bool, other_as_range: bool ) -> bool

Compares a LanguageIdentifier to another AsRef<LanguageIdentifier allowing for either side to use the missing fields as wildcards.

This allows for matching between en (treated as en-*-*-*) and en-US.

§Examples
use unic_langid_impl::LanguageIdentifier;

let li1: LanguageIdentifier = "en".parse()
    .expect("Parsing failed.");

let li2: LanguageIdentifier = "en-US".parse()
    .expect("Parsing failed.");

assert_ne!(li1, li2); // "en" != "en-US"
assert_ne!(li1.to_string(), li2.to_string()); // "en" != "en-US"

assert_eq!(li1.matches(&li2, false, false), false); // "en" != "en-US"
assert_eq!(li1.matches(&li2, true, false), true); // "en-*-*-*" == "en-US"
assert_eq!(li1.matches(&li2, false, true), false); // "en" != "en-*-US-*"
assert_eq!(li1.matches(&li2, true, true), true); // "en-*-*-*" == "en-*-US-*"
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pub fn variants(&self) -> impl ExactSizeIterator

Returns a vector of variants subtags of the LanguageIdentifier.

§Examples
use unic_langid_impl::LanguageIdentifier;

let li1: LanguageIdentifier = "ca-ES-valencia".parse()
    .expect("Parsing failed.");

assert_eq!(li1.variants().map(|v| v.as_str()).collect::<Vec<_>>(), &["valencia"]);

let li2: LanguageIdentifier = "de".parse()
    .expect("Parsing failed.");

assert_eq!(li2.variants().len(), 0);
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pub fn set_variants(&mut self, variants: &[Variant])

Sets variant subtags of the LanguageIdentifier.

§Examples
use unic_langid_impl::LanguageIdentifier;

let mut li: LanguageIdentifier = "ca-ES".parse()
    .expect("Parsing failed.");

li.set_variants(&["valencia".parse().expect("Parsing failed.")]);

assert_eq!(li.to_string(), "ca-ES-valencia");
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pub fn has_variant(&self, variant: Variant) -> bool

Tests if a variant subtag is present in the LanguageIdentifier.

§Examples
use unic_langid_impl::LanguageIdentifier;

let mut li: LanguageIdentifier = "ca-ES-macos".parse()
    .expect("Parsing failed.");

assert_eq!(li.has_variant("valencia".parse().unwrap()), false);
assert_eq!(li.has_variant("macos".parse().unwrap()), true);
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pub fn clear_variants(&mut self)

Clears variant subtags of the LanguageIdentifier.

§Examples
use unic_langid_impl::LanguageIdentifier;

let mut li: LanguageIdentifier = "ca-ES-valencia".parse()
    .expect("Parsing failed.");

li.clear_variants();

assert_eq!(li.to_string(), "ca-ES");
source

pub fn character_direction(&self) -> CharacterDirection

Returns character direction of the LanguageIdentifier.

§Examples
use unic_langid_impl::{LanguageIdentifier, CharacterDirection};

let li1: LanguageIdentifier = "es-AR".parse()
    .expect("Parsing failed.");
let li2: LanguageIdentifier = "fa".parse()
    .expect("Parsing failed.");

assert_eq!(li1.character_direction(), CharacterDirection::LTR);
assert_eq!(li2.character_direction(), CharacterDirection::RTL);

Trait Implementations§

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impl AsRef<LanguageIdentifier> for LanguageIdentifier

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fn as_ref(&self) -> &LanguageIdentifier

Converts this type into a shared reference of the (usually inferred) input type.
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impl Clone for LanguageIdentifier

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fn clone(&self) -> LanguageIdentifier

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

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

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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 LanguageIdentifier

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fn default() -> LanguageIdentifier

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

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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 FromStr for LanguageIdentifier

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type Err = LanguageIdentifierError

The associated error which can be returned from parsing.
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fn from_str(source: &str) -> Result<LanguageIdentifier, LanguageIdentifierError>

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

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

Feeds this value into the given Hasher. Read more
1.3.0 · source§

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 LanguageIdentifier

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

This method returns an Ordering between self and other. Read more
1.21.0 · source§

fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
1.21.0 · source§

fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
1.50.0 · source§

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<&str> for LanguageIdentifier

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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 PartialEq for LanguageIdentifier

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

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

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 LanguageIdentifier

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

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · source§

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
1.0.0 · source§

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
1.0.0 · source§

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · source§

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 Eq for LanguageIdentifier

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impl StructuralPartialEq for LanguageIdentifier

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Size: 32 bytes