Struct icu::locale::extensions::transform::Fields

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

A list of Key-Value pairs representing functional information about content transformations.

Here are examples of fields used in Unicode:

  • s0, d0 - Transform source/destination
  • t0 - Machine Translation
  • h0 - Hybrid Locale Identifiers

You can find the full list in Unicode BCP 47 T Extension section of LDML.

§Examples

use icu::locale::extensions::transform::{key, Fields, Value};

let value = "hybrid".parse::<Value>().expect("Failed to parse a Value.");
let fields = [(key!("h0"), value)].into_iter().collect::<Fields>();

assert_eq!(&fields.to_string(), "h0-hybrid");

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impl Fields

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pub const fn new() -> Fields

Returns a new empty list of key-value pairs. Same as default(), but is const.

§Examples
use icu::locale::extensions::transform::Fields;

assert_eq!(Fields::new(), Fields::default());
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pub fn is_empty(&self) -> bool

Returns true if there are no fields.

§Examples
use icu::locale::locale;
use icu::locale::Locale;

let loc1 = Locale::try_from_str("und-t-h0-hybrid").unwrap();
let loc2 = locale!("und-u-ca-buddhist");

assert!(!loc1.extensions.transform.fields.is_empty());
assert!(loc2.extensions.transform.fields.is_empty());
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pub fn clear(&mut self) -> Fields

Empties the Fields list.

Returns the old list.

§Examples
use icu::locale::extensions::transform::{key, Fields, Value};

let value = "hybrid".parse::<Value>().expect("Failed to parse a Value.");
let mut fields = [(key!("h0"), value)].into_iter().collect::<Fields>();

assert_eq!(&fields.to_string(), "h0-hybrid");

fields.clear();

assert_eq!(fields, Fields::new());
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pub fn contains_key<Q>(&self, key: &Q) -> bool
where Key: Borrow<Q>, Q: Ord,

Returns true if the list contains a Value for the specified Key.

§Examples
use icu::locale::extensions::transform::{Fields, Key, Value};

let key: Key = "h0".parse().expect("Failed to parse a Key.");
let value: Value = "hybrid".parse().expect("Failed to parse a Value.");
let mut fields = [(key, value)].into_iter().collect::<Fields>();

let key: Key = "h0".parse().expect("Failed to parse a Key.");
assert!(&fields.contains_key(&key));
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pub fn get<Q>(&self, key: &Q) -> Option<&Value>
where Key: Borrow<Q>, Q: Ord,

Returns a reference to the Value corresponding to the Key.

§Examples
use icu::locale::extensions::transform::{key, Fields, Value};

let value = "hybrid".parse::<Value>().unwrap();
let fields = [(key!("h0"), value.clone())]
    .into_iter()
    .collect::<Fields>();

assert_eq!(fields.get(&key!("h0")), Some(&value));
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pub fn set(&mut self, key: Key, value: Value) -> Option<Value>

Sets the specified keyword, returning the old value if it already existed.

§Examples
use icu::locale::extensions::transform::{key, Value};
use icu::locale::Locale;

let lower = "lower".parse::<Value>().expect("valid extension subtag");
let casefold = "casefold".parse::<Value>().expect("valid extension subtag");

let mut loc: Locale = "en-t-hi-d0-casefold"
    .parse()
    .expect("valid BCP-47 identifier");
let old_value = loc.extensions.transform.fields.set(key!("d0"), lower);

assert_eq!(old_value, Some(casefold));
assert_eq!(loc, "en-t-hi-d0-lower".parse().unwrap());
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pub fn retain_by_key<F>(&mut self, predicate: F)
where F: FnMut(&Key) -> bool,

Retains a subset of fields as specified by the predicate function.

§Examples
use icu::locale::extensions::transform::key;
use icu::locale::Locale;

let mut loc: Locale = "und-t-h0-hybrid-d0-hex-m0-xml".parse().unwrap();

loc.extensions
    .transform
    .fields
    .retain_by_key(|&k| k == key!("h0"));
assert_eq!(loc, "und-t-h0-hybrid".parse().unwrap());

loc.extensions
    .transform
    .fields
    .retain_by_key(|&k| k == key!("d0"));
assert_eq!(loc, Locale::default());
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impl Fields

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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 Clone for Fields

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fn clone(&self) -> Fields

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 Fields

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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 Fields

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fn default() -> Fields

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

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 From<LiteMap<Key, Value>> for Fields

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fn from(map: LiteMap<Key, Value>) -> Fields

Converts to this type from the input type.
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impl FromIterator<(Key, Value)> for Fields

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fn from_iter<I>(iter: I) -> Fields
where I: IntoIterator<Item = (Key, Value)>,

Creates a value from an iterator. Read more
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impl Hash for Fields

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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 Ord for Fields

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

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fn eq(&self, other: &Fields) -> 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 Fields

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fn partial_cmp(&self, other: &Fields) -> 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 Writeable for Fields

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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_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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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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impl Eq for Fields

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impl StructuralPartialEq for Fields

Auto Trait Implementations§

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impl Freeze for Fields

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impl RefUnwindSafe for Fields

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impl Send for Fields

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impl Sync for Fields

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impl Unpin for Fields

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impl UnwindSafe for Fields

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, 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> 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> ErasedDestructor for T
where T: 'static,

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