Function icu::properties::sets::load_id_start

pub fn load_id_start(
    provider: &impl DataProvider<IdStartV1Marker>
) -> Result<CodePointSetData, PropertiesError>

Characters that can begin an identifier. If using NFKC to fold differences between characters, use load_xid_start instead. See Unicode Standard Annex #31 for more details.

Example

use icu_properties::sets;

let data =
    sets::load_id_start(&icu_testdata::unstable())
        .expect("The data should be valid");
let id_start = data.as_borrowed();

assert!(id_start.contains('x'));
assert!(!id_start.contains('1'));
assert!(!id_start.contains('_'));
assert!(id_start.contains('ߝ'));  // U+07DD NKO LETTER FA
assert!(!id_start.contains('ⓧ'));  // U+24E7 CIRCLED LATIN SMALL LETTER X
assert!(id_start.contains32(0xFC5E));  // ARABIC LIGATURE SHADDA WITH DAMMATAN ISOLATED FORM