compareToString method

int compareToString(String other)

Compares against a decoded string without allocating one.

Returns a negative number, zero or a positive number following the same ordering as compareTo.

Implementation

int compareToString(String other) {
  var i = start;
  var j = 0;
  while (i < end && j < other.length) {
    final unit = other.codeUnitAt(j);
    final (rune, bytesUsed) = _runeAt(bytes, i, end);
    if (rune < 0) return 1; // malformed bytes sort after valid text
    final otherRune = unit >= 0xD800 && unit <= 0xDBFF
        ? 0x10000 +
              ((unit - 0xD800) << 10) +
              (other.codeUnitAt(j + 1) - 0xDC00)
        : unit;
    final diff = rune - otherRune;
    if (diff != 0) return diff;
    i += bytesUsed;
    j += otherRune > 0xFFFF ? 2 : 1;
  }
  return (end - i) - (other.length - j);
}