hyphenationPoints function

List<int> hyphenationPoints(String word)

Where word (ASCII letters) may be hyphenated: the number of letters before each break, ascending.

Implementation

List<int> hyphenationPoints(String word) {
  final lower = word.toLowerCase();
  if (lower.length < 5 || !RegExp(r'^[a-z]+$').hasMatch(lower)) return const [];
  final exception = _exceptions[lower];
  if (exception != null) return exception;
  final dotted = '.$lower.';
  final values = List<int>.filled(dotted.length + 1, 0);
  for (var i = 0; i < dotted.length; i++) {
    final end = math.min(dotted.length, i + _longestPattern);
    for (var j = i + 1; j <= end; j++) {
      final p = _patterns[dotted.substring(i, j)];
      if (p == null) continue;
      for (var k = 0; k < p.length; k++) {
        if (p[k] > values[i + k]) values[i + k] = p[k];
      }
    }
  }
  // values[i + 1] is the value between letters i - 1 and i of the word.
  return [
    for (var i = 2; i <= lower.length - 3; i++)
      if (values[i + 1].isOdd) i,
  ];
}