Function sizeOf

Extension/src/Utility/Text/characterCodes.ts:201–203

(ch: number)

/** Characters that are in this range are actually code points that take two characters in UTF-16 */
export function sizeOf(ch: number): number {
    return ch >= 0xD800 && ch <= 0xDBFF ? 2 : 1;
}

function lookupInUnicodeMap(code: number, map: readonly number[]): boolean {
    // Bail out quickly if it couldn't possibly be in the map.