File indexing completed on 2024-12-22 05:36:22

 <?php
 
 /**
  * Parses a URI into the components and fragment identifier as specified
  * by RFC 3986.
  */
 class HTMLPurifier_URIParser
 {
 
     /**
      * Instance of HTMLPurifier_PercentEncoder to do normalization with.
      */
     protected $percentEncoder;
 
     public function __construct()
     {
         $this->percentEncoder = new HTMLPurifier_PercentEncoder();
     }
 
     /**
      * Parses a URI.
      * @param $uri string URI to parse
      * @return HTMLPurifier_URI representation of URI. This representation has
      *         not been validated yet and may not conform to RFC.
      */
     public function parse($uri)
     {
         $uri = $this->percentEncoder->normalize($uri);
 
         // Regexp is as per Appendix B.
         // Note that ["<>] are an addition to the RFC's recommended
         // characters, because they represent external delimeters.
         $r_URI = '!'.
             '(([a-zA-Z0-9\.\+\-]+):)?'. // 2. Scheme
             '(//([^/?#"<>]*))?'. // 4. Authority
             '([^?#"<>]*)'.       // 5. Path
             '(\?([^#"<>]*))?'.   // 7. Query
             '(#([^"<>]*))?'.     // 8. Fragment
             '!';
 
         $matches = array();
         $result = preg_match($r_URI, $uri, $matches);
 
         if (!$result) return false; // *really* invalid URI
 
         // seperate out parts
         $scheme     = !empty($matches[1]) ? $matches[2] : null;
         $authority  = !empty($matches[3]) ? $matches[4] : null;
         $path       = $matches[5]; // always present, can be empty
         $query      = !empty($matches[6]) ? $matches[7] : null;
         $fragment   = !empty($matches[8]) ? $matches[9] : null;
 
         // further parse authority
         if ($authority !== null) {
             $r_authority = "/^((.+?)@)?(\[[^\]]+\]|[^:]*)(:(\d*))?/";
             $matches = array();
             preg_match($r_authority, $authority, $matches);
             $userinfo   = !empty($matches[1]) ? $matches[2] : null;
             $host       = !empty($matches[3]) ? $matches[3] : '';
             $port       = !empty($matches[4]) ? (int) $matches[5] : null;
         } else {
             $port = $host = $userinfo = null;
         }
 
         return new HTMLPurifier_URI(
             $scheme, $userinfo, $host, $port, $path, $query, $fragment);
     }
 
 }
 
 // vim: et sw=4 sts=4