Struct icu_normalizer::properties::CanonicalComposition

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pub struct CanonicalComposition {
    canonical_compositions: DataPayload<CanonicalCompositionsV1Marker>,
}
Expand description

The raw canonical composition operation.

Callers should generally use ComposingNormalizer instead of this API. However, this API is provided for callers such as HarfBuzz that specifically want access to the raw canonical composition operation e.g. for use in a glyph-availability-guided custom normalizer.

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§canonical_compositions: DataPayload<CanonicalCompositionsV1Marker>

Implementations§

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impl CanonicalComposition

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pub fn compose(&self, starter: char, second: char) -> Option<char>

Performs canonical composition (including Hangul) on a pair of characters or returns None if these characters don’t compose. Composition exclusions are taken into account.

§Examples
let comp = icu::normalizer::properties::CanonicalComposition::new();

assert_eq!(comp.compose('a', 'b'), None); // Just two non-composing starters
assert_eq!(comp.compose('a', '\u{0308}'), Some('ä'));
assert_eq!(comp.compose('ẹ', '\u{0302}'), Some('ệ'));
assert_eq!(comp.compose('𝅗', '𝅥'), None); // Composition exclusion
assert_eq!(comp.compose('ে', 'া'), Some('ো')); // Second is starter
assert_eq!(comp.compose('ᄀ', 'ᅡ'), Some('가')); // Hangul LV
assert_eq!(comp.compose('가', 'ᆨ'), Some('각')); // Hangul LVT
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pub const fn new() -> Self

Constructs a new CanonicalComposition using compiled data.

Enabled with the compiled_data Cargo feature.

📚 Help choosing a constructor

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pub fn try_new_with_any_provider( provider: &(impl AnyProvider + ?Sized), ) -> Result<Self, NormalizerError>

A version of Self::new that uses custom data provided by an AnyProvider.

📚 Help choosing a constructor

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pub fn try_new_unstable<D>(provider: &D) -> Result<Self, NormalizerError>

A version of Self::new that uses custom data provided by a DataProvider.

📚 Help choosing a constructor

⚠️ The bounds on provider may change over time, including in SemVer minor releases.

Trait Implementations§

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impl Debug for CanonicalComposition

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

Formats the value using the given formatter. Read more
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impl Default for CanonicalComposition

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fn default() -> Self

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

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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> 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, 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