<?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