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ARC2.php
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ARC2.php
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<?php
/**
* ARC2 core class (static, not instantiated)
*
* @author Benjamin Nowack
* @homepage <https://github.com/semsol/arc2>
* @package ARC2
*/
/* E_STRICT hack */
if (function_exists('date_default_timezone_get')) {
date_default_timezone_set(@date_default_timezone_get());
}
class ARC2 {
static function getVersion() {
return '2011-12-01';
}
/* */
static function getIncPath($f = '') {
$r = realpath(dirname(__FILE__)) . '/';
$dirs = array(
'plugin' => 'plugins',
'trigger' => 'triggers',
'store' => 'store',
'serializer' => 'serializers',
'extractor' => 'extractors',
'sparqlscript' => 'sparqlscript',
'parser' => 'parsers',
);
foreach ($dirs as $k => $dir) {
if (preg_match('/' . $k . '/i', $f)) {
return $r . $dir . '/';
}
}
return $r;
}
static function getScriptURI() {
if (isset($_SERVER) && (isset($_SERVER['SERVER_NAME']) || isset($_SERVER['HTTP_HOST']))) {
$proto = preg_replace('/^([a-z]+)\/.*$/', '\\1', strtolower($_SERVER['SERVER_PROTOCOL']));
$port = $_SERVER['SERVER_PORT'];
$server = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME'];
$script = $_SERVER['SCRIPT_NAME'];
/* https */
if (($proto == 'http') && $port == 443) {
$proto = 'https';
$port = 80;
}
return $proto . '://' . $server . ($port != 80 ? ':' . $port : '') . $script;
}
elseif (isset($_SERVER['SCRIPT_FILENAME'])) {
return 'file://' . realpath($_SERVER['SCRIPT_FILENAME']);
}
return 'http://localhost/unknown_path';
}
static function getRequestURI() {
if (isset($_SERVER) && isset($_SERVER['REQUEST_URI'])) {
return preg_replace('/^([a-z]+)\/.*$/', '\\1', strtolower($_SERVER['SERVER_PROTOCOL'])) .
'://' . (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : $_SERVER['SERVER_NAME']) .
($_SERVER['SERVER_PORT'] != 80 ? ':' . $_SERVER['SERVER_PORT'] : '') .
$_SERVER['REQUEST_URI'];
}
return ARC2::getScriptURI();
}
static function inc($f, $path = '') {
$prefix = 'ARC2';
if (preg_match('/^([^\_]+)\_(.*)$/', $f, $m)) {
$prefix = $m[1];
$f = $m[2];
}
$inc_path = $path ? $path : ARC2::getIncPath($f);
$path = $inc_path . $prefix . '_' . urlencode($f) . '.php';
if (file_exists($path)) return include_once($path);
/* safe-mode hack */
if (@include_once($path)) return 1;
/* try other path */
if ($prefix != 'ARC2') {
$path = $inc_path . strtolower($prefix) . '/' . $prefix . '_' . urlencode($f) . '.php';
if (file_exists($path)) return include_once($path);
/* safe-mode hack */
if (@include_once($path)) return 1;
}
return 0;
}
/* */
static function mtime(){
return microtime(true);
}
static function x($re, $v, $options = 'si') {
return preg_match("/^\s*" . $re . "(.*)$/" . $options, $v, $m) ? $m : false;
}
/* */
static function getFormat($val, $mtype = '', $ext = '') {
ARC2::inc('getFormat');
return ARC2_getFormat($val, $mtype, $ext);
}
static function getPreferredFormat($default = 'plain') {
ARC2::inc('getPreferredFormat');
return ARC2_getPreferredFormat($default);
}
/* */
static function toUTF8($v) {
if (urlencode($v) === $v) return $v;
//if (utf8_decode($v) == $v) return $v;
$v = (strpos(utf8_decode(str_replace('?', '', $v)), '?') === false) ? utf8_decode($v) : $v;
/* custom hacks, mainly caused by bugs in PHP's json_decode */
$mappings = array(
'%18' => '‘',
'%19' => '’',
'%1C' => '“',
'%1D' => '”',
'%1E' => '„',
'%10' => '‐',
'%12' => '−',
'%13' => '–',
'%14' => '—',
'%26' => '&',
);
$froms = array_keys($mappings);
$tos = array_values($mappings);
foreach ($froms as $i => $from) $froms[$i] = urldecode($from);
$v = str_replace($froms, $tos, $v);
/* utf8 tweaks */
return preg_replace_callback('/([\x00-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xf7][\x80-\xbf]{3}|[\xf8-\xfb][\x80-\xbf]{4}|[\xfc-\xfd][\x80-\xbf]{5}|[^\x00-\x7f])/', array('ARC2', 'getUTF8Char'), $v);
}
static function getUTF8Char($v) {
$val = $v[1];
if (strlen(trim($val)) === 1) return utf8_encode($val);
if (preg_match('/^([\x00-\x7f])(.+)/', $val, $m)) return $m[1] . ARC2::toUTF8($m[2]);
return $val;
}
/* */
static function splitURI($v) {
/* the following namespaces may lead to conflated URIs,
* we have to set the split position manually
*/
if (strpos($v, 'www.w3.org')) {
$specials = array(
'http://www.w3.org/XML/1998/namespace',
'http://www.w3.org/2005/Atom',
'http://www.w3.org/1999/xhtml',
);
foreach ($specials as $ns) {
if (strpos($v, $ns) === 0) {
$local_part = substr($v, strlen($ns));
if (!preg_match('/^[\/\#]/', $local_part)) {
return array($ns, $local_part);
}
}
}
}
/* auto-splitting on / or # */
//$re = '^(.*?)([A-Z_a-z][-A-Z_a-z0-9.]*)$';
if (preg_match('/^(.*[\/\#])([^\/\#]+)$/', $v, $m)) return array($m[1], $m[2]);
/* auto-splitting on last special char, e.g. urn:foo:bar */
if (preg_match('/^(.*[\:\/])([^\:\/]+)$/', $v, $m)) return array($m[1], $m[2]);
return array($v, '');
}
/* */
static function getSimpleIndex($triples, $flatten_objects = 1, $vals = '') {
$r = array();
foreach ($triples as $t) {
$skip_t = 0;
foreach (array('s', 'p', 'o') as $term) {
$$term = $t[$term];
/* template var */
if (isset($t[$term . '_type']) && ($t[$term . '_type'] == 'var')) {
$val = isset($vals[$$term]) ? $vals[$$term] : '';
$skip_t = isset($vals[$$term]) ? $skip_t : 1;
$type = '';
$type = !$type && isset($vals[$$term . ' type']) ? $vals[$$term . ' type'] : $type;
$type = !$type && preg_match('/^\_\:/', $val) ? 'bnode' : $type;
if ($term == 'o') {
$type = !$type && (preg_match('/\s/s', $val) || !preg_match('/\:/', $val)) ? 'literal' : $type;
$type = !$type && !preg_match('/[\/]/', $val) ? 'literal' : $type;
}
$type = !$type ? 'uri' : $type;
$t[$term . '_type'] = $type;
$$term = $val;
}
}
if ($skip_t) {
continue;
}
if (!isset($r[$s])) $r[$s] = array();
if (!isset($r[$s][$p])) $r[$s][$p] = array();
if ($flatten_objects) {
if (!in_array($o, $r[$s][$p])) $r[$s][$p][] = $o;
}
else {
$o = array('value' => $o);
foreach (array('lang', 'type', 'datatype') as $suffix) {
if (isset($t['o_' . $suffix]) && $t['o_' . $suffix]) {
$o[$suffix] = $t['o_' . $suffix];
}
elseif (isset($t['o ' . $suffix]) && $t['o ' . $suffix]) {
$o[$suffix] = $t['o ' . $suffix];
}
}
if (!in_array($o, $r[$s][$p])) {
$r[$s][$p][] = $o;
}
}
}
return $r;
}
static function getTriplesFromIndex($index) {
$r = array();
foreach ($index as $s => $ps) {
foreach ($ps as $p => $os) {
foreach ($os as $o) {
$r[] = array(
's' => $s,
'p' => $p,
'o' => $o['value'],
's_type' => preg_match('/^\_\:/', $s) ? 'bnode' : 'uri',
'o_type' => $o['type'],
'o_datatype' => isset($o['datatype']) ? $o['datatype'] : '',
'o_lang' => isset($o['lang']) ? $o['lang'] : '',
);
}
}
}
return $r;
}
static function getMergedIndex() {
$r = array();
foreach (func_get_args() as $index) {
foreach ($index as $s => $ps) {
if (!isset($r[$s])) $r[$s] = array();
foreach ($ps as $p => $os) {
if (!isset($r[$s][$p])) $r[$s][$p] = array();
foreach ($os as $o) {
if (!in_array($o, $r[$s][$p])) {
$r[$s][$p][] = $o;
}
}
}
}
}
return $r;
}
static function getCleanedIndex() {/* removes triples from a given index */
$indexes = func_get_args();
$r = $indexes[0];
for ($i = 1, $i_max = count($indexes); $i < $i_max; $i++) {
$index = $indexes[$i];
foreach ($index as $s => $ps) {
if (!isset($r[$s])) continue;
foreach ($ps as $p => $os) {
if (!isset($r[$s][$p])) continue;
$r_os = $r[$s][$p];
$new_os = array();
foreach ($r_os as $r_o) {
$r_o_val = is_array($r_o) ? $r_o['value'] : $r_o;
$keep = 1;
foreach ($os as $o) {
$del_o_val = is_array($o) ? $o['value'] : $o;
if ($del_o_val == $r_o_val) {
$keep = 0;
break;
}
}
if ($keep) {
$new_os[] = $r_o;
}
}
if ($new_os) {
$r[$s][$p] = $new_os;
}
else {
unset($r[$s][$p]);
}
}
}
}
/* check r */
$has_data = 0;
foreach ($r as $s => $ps) {
if ($ps) {
$has_data = 1;
break;
}
}
return $has_data ? $r : array();
}
/* */
static function getStructType($v) {
/* string */
if (is_string($v)) return 'string';
/* flat array, numeric keys */
if (in_array(0, array_keys($v))) {/* numeric keys */
/* simple array */
if (!is_array($v[0])) return 'array';
/* triples */
//if (isset($v[0]) && isset($v[0]['s']) && isset($v[0]['p'])) return 'triples';
if (in_array('p', array_keys($v[0]))) return 'triples';
}
/* associative array */
else {
/* index */
foreach ($v as $s => $ps) {
if (!is_array($ps)) break;
foreach ($ps as $p => $os) {
if (!is_array($os) || !is_array($os[0])) break;
if (in_array('value', array_keys($os[0]))) return 'index';
}
}
}
/* array */
return 'array';
}
/* */
static function getComponent($name, $a = '', $caller = '') {
ARC2::inc($name);
$prefix = 'ARC2';
if (preg_match('/^([^\_]+)\_(.+)$/', $name, $m)) {
$prefix = $m[1];
$name = $m[2];
}
$cls = $prefix . '_' . $name;
if (!$caller) $caller = new stdClass();
return new $cls($a, $caller);
}
/* graph */
static function getGraph($a = '') {
return ARC2::getComponent('Graph', $a);
}
/* resource */
static function getResource($a = '') {
return ARC2::getComponent('Resource', $a);
}
/* reader */
static function getReader($a = '') {
return ARC2::getComponent('Reader', $a);
}
/* parsers */
static function getParser($prefix, $a = '') {
return ARC2::getComponent($prefix . 'Parser', $a);
}
static function getRDFParser($a = '') {
return ARC2::getParser('RDF', $a);
}
static function getRDFXMLParser($a = '') {
return ARC2::getParser('RDFXML', $a);
}
static function getTurtleParser($a = '') {
return ARC2::getParser('Turtle', $a);
}
static function getRSSParser($a = '') {
return ARC2::getParser('RSS', $a);
}
static function getSemHTMLParser($a = '') {
return ARC2::getParser('SemHTML', $a);
}
static function getSPARQLParser($a = '') {
return ARC2::getComponent('SPARQLParser', $a);
}
static function getSPARQLPlusParser($a = '') {
return ARC2::getParser('SPARQLPlus', $a);
}
static function getSPARQLXMLResultParser($a = '') {
return ARC2::getParser('SPARQLXMLResult', $a);
}
static function getJSONParser($a = '') {
return ARC2::getParser('JSON', $a);
}
static function getSGAJSONParser($a = '') {
return ARC2::getParser('SGAJSON', $a);
}
static function getCBJSONParser($a = '') {
return ARC2::getParser('CBJSON', $a);
}
static function getSPARQLScriptParser($a = '') {
return ARC2::getParser('SPARQLScript', $a);
}
/* store */
static function getStore($a = '', $caller = '') {
return ARC2::getComponent('Store', $a, $caller);
}
static function getStoreEndpoint($a = '', $caller = '') {
return ARC2::getComponent('StoreEndpoint', $a, $caller);
}
static function getRemoteStore($a = '', $caller = '') {
return ARC2::getComponent('RemoteStore', $a, $caller);
}
static function getMemStore($a = '') {
return ARC2::getComponent('MemStore', $a);
}
/* serializers */
static function getSer($prefix, $a = '') {
return ARC2::getComponent($prefix . 'Serializer', $a);
}
static function getTurtleSerializer($a = '') {
return ARC2::getSer('Turtle', $a);
}
static function getRDFXMLSerializer($a = '') {
return ARC2::getSer('RDFXML', $a);
}
static function getNTriplesSerializer($a = '') {
return ARC2::getSer('NTriples', $a);
}
static function getRDFJSONSerializer($a = '') {
return ARC2::getSer('RDFJSON', $a);
}
static function getPOSHRDFSerializer($a = '') {/* deprecated */
return ARC2::getSer('POSHRDF', $a);
}
static function getMicroRDFSerializer($a = '') {
return ARC2::getSer('MicroRDF', $a);
}
static function getRSS10Serializer($a = '') {
return ARC2::getSer('RSS10', $a);
}
/* sparqlscript */
static function getSPARQLScriptProcessor($a = '') {
return ARC2::getComponent('SPARQLScriptProcessor', $a);
}
/* */
}