Function utf32ToUtf16SurrogatePair

source/core/StarUnicode.cpp:258–271

}

pair<Utf32Type, Maybe<Utf32Type>> utf32ToUtf16SurrogatePair(Utf32Type codepoint) {
  if (codepoint >= MIN_PAIR) {
    codepoint -= MIN_PAIR;
    Utf32Type lead = (codepoint >> 10) + MIN_LEAD;
    Utf32Type trail = (codepoint & SURR_MASK) + MIN_TRAIL;

    if (!isUtf16LeadSurrogate(lead))
      throw UnicodeException("Invalid codepoint passed to utf32ToUtf16SurrogatePair");

    return {lead, trail};
  }

  return {codepoint, {}};
}

}