<?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
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