mirror of
https://github.com/ezyang/htmlpurifier.git
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59 lines
2.1 KiB
PHP
59 lines
2.1 KiB
PHP
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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 2396.
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*/
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class HTMLPurifier_URIParser
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{
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/**
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* Parses a URI
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* @param $uri string URI to parse
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* @return array(userinfo, host, int port, path, query, fragment) components
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*/
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function parse($uri) {
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$r_URI = '!'.
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'(([^:/?#<>\'"]+):)?'. // 2. Scheme
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'(//([^/?#<>\'"]*))?'. // 4. Authority
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'([^?#<>\'"]*)'. // 5. Path
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'(\?([^#<>\'"]*))?'. // 7. Query
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'(#([^<>\'"]*))?'. // 8. Fragment
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'!';
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$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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// ridiculously inefficient: it's a stacked regex!
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$HEXDIG = '[A-Fa-f0-9]';
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$unreserved = 'A-Za-z0-9-._~'; // make sure you wrap with []
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$sub_delims = '!$&\'()'; // needs []
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$pct_encoded = "%$HEXDIG$HEXDIG";
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$r_userinfo = "(?:[$unreserved$sub_delims:]|$pct_encoded)*";
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$r_authority = "/^(($r_userinfo)@)?(\[[^\]]+\]|[^:]*)(:(\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 = $userinfo = null;
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}
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return array($scheme, $userinfo, $host, $port, $path, $query, $fragment);
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}
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}
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