function consume_parenthesized_link_title()

in src/_Private/consume_link_title.php [78:121]

• 38 lines of code
• 12 McCabe index (conditional complexity)

function consume_parenthesized_link_title(string $input): ?(string, int) {
  invariant($input[0] === '(', 'must start with paren');
  $len = Str\length($input);
  $title = '';
  $depth = 0;
  for ($idx = 0; $idx < $len; ++$idx) {
    $chr = $input[$idx];
    if ($chr === "\n" && ($chr[$idx + 1] ?? null) === "\n") {
      return null;
    }

    if ($chr === '(') {
      ++$depth;
      continue;
    }

    if ($chr === ')') {
      --$depth;
      if ($depth === 0) {
        break;
      }
      continue;
    }

    if ($chr === "\\") {
      if ($idx + 1 < $len) {
        $next = $input[$idx + 1];
        if (C\contains_key(ASCII_PUNCTUATION, $next)) {
          $title .= $next;
          ++$idx;
          continue;
        }
      }
    }

    $title .= $chr;
  }

  if ($depth !== 0) {
    return null;
  }

  return tuple($title, $idx + 1);
}