Struct Lang 

pub struct Lang(pub LanguageIdentifier);

Identifies the language, region and script of text.

Use the lang! macro to construct one, it does compile-time validation.

Use the unic_langid crate for more advanced operations such as runtime parsing and editing identifiers, this type is just an alias for the core struct of that crate.

Tuple Fields

0: LanguageIdentifier

Implementations

impl Lang

pub fn direction(&self) -> LayoutDirection

Returns character direction of the language.

pub fn matches( &self, other: &Lang, self_as_range: bool, other_as_range: bool, ) -> bool

Compares a language to another allowing for either side to use the missing fields as wildcards.

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

Examples

let l1 = lang!("en");
let l2 = lang!("en-US");

assert_ne!(l1, l2); // "en" != "en-US"
assert!(!l1.matches(&l2, false, false)); // "en" != "en-US"

assert!(l1.matches(&l2, true, false)); // "en-*-*-*" == "en-US"
assert!(!l1.matches(&l2, false, true)); // "en" != "en-*-US-*"
assert!(l1.matches(&l2, true, true)); // "en-*-*-*" == "en-*-US-*"

Note that machine variant is ignored when matching.

let pt_br = lang!("pt-BR");
let pt_pt = lang!("pt-PT");
let pt = lang!("pt");
let pt_m = lang!("pt-machine");

assert!(!pt_br.matches(&pt_pt, true, false)); // "pt-BR-*-*" != "pt-PT"
assert!(pt.matches(&pt_pt, true, false)); // "pt-*-*-*" == "pt-PT"
assert!(pt_m.matches(&pt_pt, true, false)); // "pt-machine-*-*" == "pt-PT"

assert!(pt_m.matches(&pt, false, false)); // "pt-machine" == "pt"
assert_ne!(pt_m, pt); // but "pt-machine" != "pt" in `PartialEq`

pub fn is_machine_translation(&self) -> bool

If the language has a machine variant.

Machine translated resources are expected to be of lesser quality, but better than nothing. This variant indicates that the resource should be given lower priority. If a machine generated resource if reviewed by a human translator the machine variant must be removed.

pub fn autonym(&self) -> Option<LangAutonym>

Returns the name of the language and region in own language.

The names are in localized title case, when the name is the same in different scripts the script name is part of the language name (currently Hans/Hant).

Returns None if the locale is not one of the 90 most common locales embedded. Language must match, script must match exactly (omitted different from explicit), region is optional (if not matched returns only language name), variants are ignored.

pub fn cmp_display(&self, other: &Lang) -> Ordering

Get ordering of this and other as fmt::Display text.

This method avoids actually allocating a string.

Methods from Deref<Target = LanguageIdentifier>

pub fn matches<O>( &self, other: &O, self_as_range: bool, other_as_range: bool, ) -> bool

where O: AsRef<LanguageIdentifier>,

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-*"

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);

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);

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

impl Clone for Lang

fn clone(&self) -> Lang

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Lang

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

Formats the value using the given formatter.

impl Default for Lang

fn default() -> Lang

Returns the “default value” for a type.

impl Deref for Lang

type Target = LanguageIdentifier

The resulting type after dereferencing.

fn deref(&self) -> &<Lang as Deref>::Target

Dereferences the value.

impl<'de> Deserialize<'de> for Lang

fn deserialize<__D>( __deserializer: __D, ) -> Result<Lang, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Lang

Prints the autonym if built with "lang_autonym" and has one, otherwise prints the tags.

{} prints language and region (if set), {:#} only prints language.

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

Formats the value using the given formatter.

impl From<Lang> for Langs

fn from(lang: Lang) -> Langs

Converts to this type from the input type.

impl FromStr for Lang

type Err = LanguageIdentifierError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Lang, <Lang as FromStr>::Err>

Parses a string s to return a value of this type.

impl Hash for Lang

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

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl IntoVar<Langs> for Lang

fn into_var(self) -> Var<Langs>

impl Ord for Lang

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

This method returns an Ordering between self and other.

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

where Self: Sized,

Compares and returns the maximum of two values.

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

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Lang

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Lang

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

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Serialize for Lang

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.

impl Eq for Lang

impl IntoValue<Langs> for Lang

impl StructuralPartialEq for Lang