Function icu::properties::sets::get_id_start

pub fn get_id_start(
    provider: &impl ResourceProvider<IdStartV1Marker>
) -> Result<DataPayload<IdStartV1Marker>, PropertiesError>

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

Example

use icu_properties::sets;

let provider = icu_testdata::get_provider();
let payload =
    sets::get_id_start(&provider)
        .expect("The data should be valid");
let data_struct = payload.get();
let id_start = &data_struct.inv_list;

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.contains_u32(0xFC5E));  // ARABIC LIGATURE SHADDA WITH DAMMATAN ISOLATED FORM