protected static function isValidPath(string $path): bool
    {
        // http://tools.ietf.org/html/rfc3986#section-3
        // The scheme and path components are required, though the path may be
        // empty (no characters)
        if ($path === '') {
            return true;
        }

        // http://tools.ietf.org/html/rfc3986#section-3.3
        // path          = path-abempty    ; begins with "/" or is empty
        //               / path-absolute   ; begins with "/" but not "//"
        //               / path-noscheme   ; begins with a non-colon segment
        //               / path-rootless   ; begins with a segment
        //               / path-empty      ; zero characters
        //
        // path-abempty  = *( "/" segment )
        // path-absolute = "/" [ segment-nz *( "/" segment ) ]
        // path-noscheme = segment-nz-nc *( "/" segment )
        // path-rootless = segment-nz *( "/" segment )
        // path-empty    = 0<pchar>
        // segment       = *pchar
        // segment-nz    = 1*pchar
        // segment-nz-nc = 1*( unreserved / pct-encoded / sub-delims / "@" )
        //               ; non-zero-length segment without any colon ":"
        // pchar         = unreserved / pct-encoded / sub-delims / ":" / "@"
        $pattern = sprintf(
            '/\A(?:(?:[%s%s:@]|(?:%s))*\/?)*\z/',
            static::UNRESERVED_SET,
            static::SUB_DELIMS_SET,
            static::PCT_ENCODED_SET
        );

        return !!preg_match($pattern, $path);
    }