16     public $scheme;  variable in HTMLPurifier_URI
49      * @param string $scheme
58     public function __construct($scheme, $userinfo, $host, $port, $path, $query, $fragment)  argument
60         $this->scheme = is_null($scheme) || ctype_lower($scheme) ? $scheme : strtolower($scheme);
78         if ($this->scheme !== null) {
79             $scheme_obj = $registry->getScheme($this->scheme, $config, $context);
130         if (!is_null($this->scheme) && is_null($this->host) || $this->host === '') {
134             if ($def->defaultScheme === $this->scheme) {
135                 $this->scheme = null;
178             } elseif (!is_null($this->scheme)) {
244         if (!is_null($this->scheme)) {
245             $result .= $this->scheme . ':';