Struct icu::locale::extensions::unicode::Value

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

A value used in a list of Keywords.

The value has to be a sequence of one or more alphanumerical strings separated by -. Each part of the sequence has to be no shorter than three characters and no longer than 8.

§Examples

use icu::locale::extensions::unicode::{value, Value};
use writeable::assert_writeable_eq;

assert_writeable_eq!(value!("gregory"), "gregory");
assert_writeable_eq!(
    "islamic-civil".parse::<Value>().unwrap(),
    "islamic-civil"
);

// The value "true" has the special, empty string representation
assert_eq!(value!("true").to_string(), "");

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impl Value

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

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

§Examples
use icu::locale::extensions::unicode::Value;

Value::try_from_str("buddhist").expect("Parsing failed.");
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pub fn try_from_utf8(code_units: &[u8]) -> Result<Value, ParseError>

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pub const fn as_single_subtag(&self) -> Option<&Subtag>

Returns a reference to a single Subtag if the Value contains exactly one subtag, or None otherwise.

§Examples
use icu::locale::extensions::unicode::Value;
use core::str::FromStr;

let value1 = Value::from_str("foo")
    .expect("failed to parse a Value");
let value2 = Value::from_str("foo-bar")
    .expect("failed to parse a Value");

assert!(value1.as_single_subtag().is_some());
assert!(value2.as_single_subtag().is_none());
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pub fn into_single_subtag(self) -> Option<Subtag>

Destructs into a single Subtag if the Value contains exactly one subtag, or returns None otherwise.

§Examples
use icu::locale::extensions::unicode::Value;
use core::str::FromStr;

let value1 = Value::from_str("foo")
    .expect("failed to parse a Value");
let value2 = Value::from_str("foo-bar")
    .expect("failed to parse a Value");

assert!(value1.into_single_subtag().is_some());
assert!(value2.into_single_subtag().is_none());
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pub fn push_subtag(&mut self, subtag: Subtag)

Appends a subtag to the back of a Value.

§Examples
use icu::locale::{
    extensions::unicode::Value,
    subtags::subtag,
};

let mut v = Value::default();
v.push_subtag(subtag!("foo"));
v.push_subtag(subtag!("bar"));
assert_eq!(v, "foo-bar");
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pub fn subtag_count(&self) -> usize

Returns the number of subtags in the Value.

§Examples
use icu::locale::{
    extensions::unicode::Value,
    subtags::subtag,
};

let mut v = Value::default();
assert_eq!(v.subtag_count(), 0);
v.push_subtag(subtag!("foo"));
assert_eq!(v.subtag_count(), 1);
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pub fn is_empty(&self) -> bool

Returns true if the Value has no subtags.

§Examples
use icu::locale::{
    extensions::unicode::Value,
    subtags::subtag,
};

let mut v = Value::default();
assert_eq!(v.is_empty(), true);
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pub fn remove_subtag(&mut self, idx: usize) -> Option<Subtag>

Removes and returns the subtag at position index within the value, shifting all subtags after it to the left.

§Examples
use icu::locale::{
    extensions::unicode::Value,
    subtags::subtag,
};
let mut v = Value::default();
v.push_subtag(subtag!("foo"));
v.push_subtag(subtag!("bar"));
v.push_subtag(subtag!("baz"));

assert_eq!(v.remove_subtag(1), Some(subtag!("bar")));
assert_eq!(v, "foo-baz");
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pub fn get_subtag(&self, idx: usize) -> Option<&Subtag>

Returns a reference to a subtag at index.

§Examples
use icu::locale::{
    extensions::unicode::Value,
    subtags::subtag,
};
let mut v = Value::default();
v.push_subtag(subtag!("foo"));
v.push_subtag(subtag!("bar"));
v.push_subtag(subtag!("baz"));

assert_eq!(v.get_subtag(1), Some(&subtag!("bar")));
assert_eq!(v.get_subtag(3), None);
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pub fn from_vec_unchecked(input: Vec<Subtag>) -> Value

A constructor which takes a pre-sorted list of Value elements.

§Examples
use icu::locale::extensions::unicode::Value;
use icu::locale::subtags::subtag;

let subtag1 = subtag!("foobar");
let subtag2 = subtag!("testing");
let mut v = vec![subtag1, subtag2];
v.sort();
v.dedup();

let value = Value::from_vec_unchecked(v);

Notice: For performance- and memory-constrained environments, it is recommended for the caller to use binary_search instead of sort and dedup.

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impl Value

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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.

Trait Implementations§

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impl Clone for Value

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fn clone(&self) -> Value

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 Value

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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 Value

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fn default() -> Value

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

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 Extend<Subtag> for Value

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fn extend<T>(&mut self, iter: T)
where T: IntoIterator<Item = Subtag>,

Extends a collection with the contents of an iterator. Read more
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fn extend_one(&mut self, item: A)

🔬This is a nightly-only experimental API. (extend_one)
Extends a collection with exactly one element.
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fn extend_reserve(&mut self, additional: usize)

🔬This is a nightly-only experimental API. (extend_one)
Reserves capacity in a collection for the given number of additional elements. Read more
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impl From<CalendarAlgorithm> for Value

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fn from(input: CalendarAlgorithm) -> Value

Converts to this type from the input type.
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impl From<CollationCaseFirst> for Value

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fn from(input: CollationCaseFirst) -> Value

Converts to this type from the input type.
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impl From<CollationNumericOrdering> for Value

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fn from(input: CollationNumericOrdering) -> Value

Converts to this type from the input type.
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impl From<CollationType> for Value

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fn from(input: CollationType) -> Value

Converts to this type from the input type.
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impl From<CommonVariantType> for Value

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fn from(input: CommonVariantType) -> Value

Converts to this type from the input type.
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impl From<CurrencyFormatStyle> for Value

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fn from(input: CurrencyFormatStyle) -> Value

Converts to this type from the input type.
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impl From<CurrencyType> for Value

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fn from(input: CurrencyType) -> Value

Converts to this type from the input type.
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impl From<DictionaryBreakScriptExclusions> for Value

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fn from(input: DictionaryBreakScriptExclusions) -> Value

Converts to this type from the input type.
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impl From<EmojiPresentationStyle> for Value

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fn from(input: EmojiPresentationStyle) -> Value

Converts to this type from the input type.
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impl From<FirstDay> for Value

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fn from(input: FirstDay) -> Value

Converts to this type from the input type.
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impl From<HourCycle> for Value

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fn from(input: HourCycle) -> Value

Converts to this type from the input type.
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impl From<LineBreakStyle> for Value

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fn from(input: LineBreakStyle) -> Value

Converts to this type from the input type.
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impl From<LineBreakWordHandling> for Value

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fn from(input: LineBreakWordHandling) -> Value

Converts to this type from the input type.
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impl From<MeasurementSystem> for Value

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fn from(input: MeasurementSystem) -> Value

Converts to this type from the input type.
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impl From<MeasurementUnitOverride> for Value

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fn from(input: MeasurementUnitOverride) -> Value

Converts to this type from the input type.
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impl From<NumberingSystem> for Value

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fn from(input: NumberingSystem) -> Value

Converts to this type from the input type.
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impl From<RegionOverride> for Value

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fn from(input: RegionOverride) -> Value

Converts to this type from the input type.
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impl From<RegionalSubdivision> for Value

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fn from(input: RegionalSubdivision) -> Value

Converts to this type from the input type.
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impl From<SentenceBreakSupressions> for Value

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fn from(input: SentenceBreakSupressions) -> Value

Converts to this type from the input type.
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impl From<TimeZoneShortId> for Value

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fn from(input: TimeZoneShortId) -> Value

Converts to this type from the input type.
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impl FromIterator<Subtag> for Value

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fn from_iter<T>(iter: T) -> Value
where T: IntoIterator<Item = Subtag>,

Creates a value from an iterator. Read more
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impl FromStr for Value

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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<Value, <Value as FromStr>::Err>

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

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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 IntoIterator for Value

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type Item = Subtag

The type of the elements being iterated over.
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type IntoIter = ShortBoxSliceIntoIter<Subtag>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> <Value as IntoIterator>::IntoIter

Creates an iterator from a value. Read more
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impl Ord for Value

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fn cmp(&self, other: &Value) -> 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<&str> for Value

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fn eq(&self, other: &&str) -> 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 PartialEq for Value

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

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fn partial_cmp(&self, other: &Value) -> 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 TryFrom<&Value> for CalendarAlgorithm

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<CalendarAlgorithm, <CalendarAlgorithm as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for CollationCaseFirst

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<CollationCaseFirst, <CollationCaseFirst as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for CollationNumericOrdering

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<CollationNumericOrdering, <CollationNumericOrdering as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for CollationType

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<CollationType, <CollationType as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for CommonVariantType

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<CommonVariantType, <CommonVariantType as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for CurrencyFormatStyle

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<CurrencyFormatStyle, <CurrencyFormatStyle as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for EmojiPresentationStyle

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<EmojiPresentationStyle, <EmojiPresentationStyle as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for FirstDay

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from(s: &Value) -> Result<FirstDay, <FirstDay as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for HourCycle

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<HourCycle, <HourCycle as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for LineBreakStyle

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<LineBreakStyle, <LineBreakStyle as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for LineBreakWordHandling

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<LineBreakWordHandling, <LineBreakWordHandling as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for MeasurementSystem

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<MeasurementSystem, <MeasurementSystem as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for MeasurementUnitOverride

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<MeasurementUnitOverride, <MeasurementUnitOverride as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<&Value> for SentenceBreakSupressions

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( s: &Value, ) -> Result<SentenceBreakSupressions, <SentenceBreakSupressions as TryFrom<&Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for CurrencyType

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( input: Value, ) -> Result<CurrencyType, <CurrencyType as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for DictionaryBreakScriptExclusions

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( input: Value, ) -> Result<DictionaryBreakScriptExclusions, <DictionaryBreakScriptExclusions as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for NumberingSystem

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( input: Value, ) -> Result<NumberingSystem, <NumberingSystem as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for RegionOverride

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( input: Value, ) -> Result<RegionOverride, <RegionOverride as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for RegionalSubdivision

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( input: Value, ) -> Result<RegionalSubdivision, <RegionalSubdivision as TryFrom<Value>>::Error>

Performs the conversion.
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impl TryFrom<Value> for TimeZoneShortId

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type Error = PreferencesParseError

The type returned in the event of a conversion error.
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fn try_from( input: Value, ) -> Result<TimeZoneShortId, <TimeZoneShortId as TryFrom<Value>>::Error>

Performs the conversion.
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impl Writeable for Value

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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 Eq for Value

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impl StructuralPartialEq for Value

Auto Trait Implementations§

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impl Freeze for Value

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impl RefUnwindSafe for Value

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impl Send for Value

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impl Sync for Value

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impl Unpin for Value

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impl UnwindSafe for Value

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,