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<?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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