def utf8.three

emerging-ezhttp@0.21.0.0 · src/pct.bend:43

import Base

43# three bytes below U+10000, else four
44def utf8.three(+cp: U32, fits: Bool) -> List<&2, U32>:
45  match fits:
46    case True{}:
47      [U32.or(224, U32.shrn(cp, 12n)), cont(cp, 6n), cont(cp, 0n)]
48    case False{}:
49      utf8.four(cp)