/usr/share/php/arc/ARC2_getFormat.php is in libarc-php 2~20101006-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* ARC2 format detection function
*
* @author Benjamin Nowack <bnowack@semsol.com>
* @license http://arc.semsol.org/license
* @package ARC2
* @version 2010-11-16
*/
function ARC2_getFormat($v, $mtype = '', $ext = '') {
$r = false;
/* mtype check (atom, rdf/xml, turtle, n3, mp3, jpg) */
$r = (!$r && preg_match('/\/atom\+xml/', $mtype)) ? 'atom' : $r;
$r = (!$r && preg_match('/\/rdf\+xml/', $mtype)) ? 'rdfxml' : $r;
$r = (!$r && preg_match('/\/(x\-)?turtle/', $mtype)) ? 'turtle' : $r;
$r = (!$r && preg_match('/\/rdf\+n3/', $mtype)) ? 'n3' : $r;
$r = (!$r && preg_match('/\/sparql-results\+xml/', $mtype)) ? 'sparqlxml' : $r;
/* xml sniffing */
if (
!$r &&
/* starts with angle brackets */
preg_match('/^\s*\<[^\s]/s', $v) &&
/* has an xmlns:* declaration or a matching pair of tags */
(preg_match('/\sxmlns\:?/', $v) || preg_match('/\<([^\s]+).+\<\/\\1\>/s', $v)) &&
/* not a typical ntriples/turtle/n3 file */
!preg_match('/[\>\"\']\s*\.\s*$/s', $v)
) {
while (preg_match('/^\s*\<\?xml[^\r\n]+\?\>\s*/s', $v)) {
$v = preg_replace('/^\s*\<\?xml[^\r\n]+\?\>\s*/s', '', $v);
}
while (preg_match('/^\s*\<\!--.+?--\>\s*/s', $v)) {
$v = preg_replace('/^\s*\<\!--.+?--\>\s*/s', '', $v);
}
/* doctype checks (html, rdf) */
$r = (!$r && preg_match('/^\s*\<\!DOCTYPE\s+html[\s|\>]/is', $v)) ? 'html' : $r;
$r = (!$r && preg_match('/^\s*\<\!DOCTYPE\s+[a-z0-9\_\-]\:RDF\s/is', $v)) ? 'rdfxml' : $r;
/* markup checks */
$v = preg_replace('/^\s*\<\!DOCTYPE\s.*\]\>/is', '', $v);
$r = (!$r && preg_match('/^\s*\<rss\s+[^\>]*version/s', $v)) ? 'rss' : $r;
$r = (!$r && preg_match('/^\s*\<feed\s+[^\>]+http\:\/\/www\.w3\.org\/2005\/Atom/s', $v)) ? 'atom' : $r;
$r = (!$r && preg_match('/^\s*\<opml\s/s', $v)) ? 'opml' : $r;
$r = (!$r && preg_match('/^\s*\<html[\s|\>]/is', $v)) ? 'html' : $r;
$r = (!$r && preg_match('/^\s*\<sparql\s+[^\>]+http\:\/\/www\.w3\.org\/2005\/sparql\-results\#/s', $v)) ? 'sparqlxml' : $r;
$r = (!$r && preg_match('/^\s*\<[^\>]+http\:\/\/www\.w3\.org\/2005\/sparql\-results#/s', $v)) ? 'srx' : $r;
$r = (!$r && preg_match('/^\s*\<[^\s]*RDF[\s\>]/s', $v)) ? 'rdfxml' : $r;
$r = (!$r && preg_match('/^\s*\<[^\>]+http\:\/\/www\.w3\.org\/1999\/02\/22\-rdf/s', $v)) ? 'rdfxml' : $r;
$r = !$r ? 'xml' : $r;
}
/* json|jsonp */
if (!$r && preg_match('/^[a-z0-9\.\(]*\s*[\{\[].*/s', trim($v))) {
/* google social graph api */
$r = (!$r && preg_match('/\"canonical_mapping\"/', $v)) ? 'sgajson' : $r;
/* crunchbase api */
$r = (!$r && preg_match('/\"permalink\"/', $v)) ? 'cbjson' : $r;
$r = !$r ? 'json' : $r;
}
/* turtle/n3 */
$r = (!$r && preg_match('/\@(prefix|base)/i', $v)) ? 'turtle' : $r;
$r = (!$r && preg_match('/^(ttl)$/', $ext)) ? 'turtle' : $r;
$r = (!$r && preg_match('/^(n3)$/', $ext)) ? 'n3' : $r;
/* ntriples */
$r = (!$r && preg_match('/^\s*(_:|<).+?\s+<[^>]+?>\s+\S.+?\s*\.\s*$/sm', $v)) ? 'ntriples' : $r;
$r = (!$r && preg_match('/^(nt)$/', $ext)) ? 'ntriples' : $r;
return $r;
}
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