_PathRelation _isWithinOrEquals()

in lib/src/context.dart [569:612]
35 lines of code
21 McCabe index (conditional complexity)

  _PathRelation _isWithinOrEquals(String parent, String child) {
    // Make both paths the same level of relative. We're only able to do the
    // quick comparison if both paths are in the same format, and making a path
    // absolute is faster than making it relative.
    final parentIsAbsolute = isAbsolute(parent);
    final childIsAbsolute = isAbsolute(child);
    if (parentIsAbsolute && !childIsAbsolute) {
      child = absolute(child);
      if (style.isRootRelative(parent)) parent = absolute(parent);
    } else if (childIsAbsolute && !parentIsAbsolute) {
      parent = absolute(parent);
      if (style.isRootRelative(child)) child = absolute(child);
    } else if (childIsAbsolute && parentIsAbsolute) {
      final childIsRootRelative = style.isRootRelative(child);
      final parentIsRootRelative = style.isRootRelative(parent);

      if (childIsRootRelative && !parentIsRootRelative) {
        child = absolute(child);
      } else if (parentIsRootRelative && !childIsRootRelative) {
        parent = absolute(parent);
      }
    }

    final result = _isWithinOrEqualsFast(parent, child);
    if (result != _PathRelation.inconclusive) return result;

    String relative;
    try {
      relative = this.relative(child, from: parent);
    } on PathException catch (_) {
      // If no relative path from [parent] to [child] is found, [child]
      // definitely isn't a child of [parent].
      return _PathRelation.different;
    }

    if (!isRelative(relative)) return _PathRelation.different;
    if (relative == '.') return _PathRelation.equal;
    if (relative == '..') return _PathRelation.different;
    return (relative.length >= 3 &&
            relative.startsWith('..') &&
            style.isSeparator(relative.codeUnitAt(2)))
        ? _PathRelation.different
        : _PathRelation.within;
  }