Struct CanonicalComposition

pub struct CanonicalComposition { /* private fields */ }

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.

Implementations

impl CanonicalComposition

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

pub const fn new() -> Self

Constructs a new CanonicalComposition using compiled data.

✨ Enabled with the compiled_data Cargo feature.

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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.

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

where D: DataProvider<CanonicalCompositionsV1Marker> + ?Sized,

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

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

Trait Implementations

impl Debug for CanonicalComposition

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

Formats the value using the given formatter.

impl Default for CanonicalComposition

fn default() -> Self

Returns the “default value” for a type.