_PathDirection _pathDirection()

in lib/src/context.dart [824:874]

• 31 lines of code
• 18 McCabe index (conditional complexity)

  _PathDirection _pathDirection(String path, int index) {
    var depth = 0;
    var reachedRoot = false;
    var i = index;
    while (i < path.length) {
      // Ignore initial separators or doubled separators.
      while (i < path.length && style.isSeparator(path.codeUnitAt(i))) {
        i++;
      }

      // If we're at the end, stop.
      if (i == path.length) break;

      // Move through the path component to the next separator.
      final start = i;
      while (i < path.length && !style.isSeparator(path.codeUnitAt(i))) {
        i++;
      }

      // See if the path component is ".", "..", or a name.
      if (i - start == 1 && path.codeUnitAt(start) == chars.period) {
        // Don't change the depth.
      } else if (i - start == 2 &&
          path.codeUnitAt(start) == chars.period &&
          path.codeUnitAt(start + 1) == chars.period) {
        // ".." backs out a directory.
        depth--;

        // If we work back beyond the root, stop.
        if (depth < 0) break;

        // Record that we reached the root so we don't return
        // [_PathDirection.belowRoot].
        if (depth == 0) reachedRoot = true;
      } else {
        // Step inside a directory.
        depth++;
      }

      // If we're at the end, stop.
      if (i == path.length) break;

      // Move past the separator.
      i++;
    }

    if (depth < 0) return _PathDirection.aboveRoot;
    if (depth == 0) return _PathDirection.atRoot;
    if (reachedRoot) return _PathDirection.reachesRoot;
    return _PathDirection.belowRoot;
  }