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