function split()

in src/regex/regex.php [187:227]

• 37 lines of code
• 6 McCabe index (conditional complexity)

function split(
  string $haystack,
  Pattern<Match> $delimiter,
  ?int $limit = null,
)[]: vec<string> {
  if ($limit === null) {
    $limit = \INF;
  }
  invariant(
    $limit > 1,
    'Expected limit greater than 1, got %d.',
    $limit,
  );
  $haystack_length = Str\length($haystack);
  $result = vec[];
  $offset = 0;
  $match_end = 0;
  $count = 1;
  $match = _Private\regex_match($haystack, $delimiter, inout $offset);
  while ($match && $count < $limit) {
    // Copy anything between the previous match and this one
    $result[] = Str\slice($haystack, $match_end, $offset - $match_end);
    $match_length = Str\length(Shapes::at($match, 0) as string);
    $match_end = $offset + $match_length;
    if ($match_length === 0) {
      // To get the next match (and avoid looping forever), need to skip forward
      // before searching again
      // Note that `$offset` is for searching and `$match_end` is for copying
      $offset++;
      if ($offset > $haystack_length) {
        break;
      }
    } else {
      $offset = $match_end;
    }
    $count++;
    $match = _Private\regex_match($haystack, $delimiter, inout $offset);
  }
  $result[] = Str\slice($haystack, $match_end);
  return $result;
}