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<?php
namespace EasyRdf\Parser;
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2014 Nicholas J Humfrey. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
* promote products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2014 Nicholas J Humfrey
* @license https://www.opensource.org/licenses/bsd-license.php
*/
use EasyRdf\Graph;
use EasyRdf\Parser;
use ML\JsonLD as LD;
/**
* Class to parse JSON-LD to an EasyRdf\Graph
*
* @package EasyRdf
* @copyright Copyright (c) 2014 Markus Lanthaler
* @author Markus Lanthaler <mail@markus-lanthaler.com>
* @license https://www.opensource.org/licenses/bsd-license.php
*/
class JsonLd extends Parser
{
/**
* Parse a JSON-LD document into an EasyRdf\Graph
*
* Attention: Since JSON-LD supports datasets, a document may contain
* multiple graphs and not just one. This parser returns only the
* default graph. An alternative would be to merge all graphs.
*
* @param Graph $graph the graph to load the data into
* @param string $data the RDF document data
* @param string $format the format of the input data
* @param string $baseUri the base URI of the data being parsed
*
* @throws Exception
* @throws \EasyRdf\Exception
* @return integer The number of triples added to the graph
*/
public function parse($graph, $data, $format, $baseUri)
{
parent::checkParseParams($graph, $data, $format, $baseUri);
if ($format != 'jsonld') {
throw new \EasyRdf\Exception(
"EasyRdf\\Parser\\JsonLd does not support {$format}"
);
}
try {
$quads = LD\JsonLD::toRdf($data, array('base' => $baseUri));
} catch (LD\Exception\JsonLdException $e) {
throw new Exception($e->getMessage());
}
foreach ($quads as $quad) {
// Ignore named graphs
if (null !== $quad->getGraph()) {
continue;
}
$subject = (string) $quad->getSubject();
if ('_:' === substr($subject, 0, 2)) {
$subject = $this->remapBnode($subject);
}
$predicate = (string) $quad->getProperty();
if ($quad->getObject() instanceof \ML\IRI\IRI) {
$object = array(
'type' => 'uri',
'value' => (string) $quad->getObject()
);
if ('_:' === substr($object['value'], 0, 2)) {
$object = array(
'type' => 'bnode',
'value' => $this->remapBnode($object['value'])
);
}
} else {
$object = array(
'type' => 'literal',
'value' => $quad->getObject()->getValue()
);
if ($quad->getObject() instanceof LD\LanguageTaggedString) {
$object['lang'] = $quad->getObject()->getLanguage();
} else {
$object['datatype'] = $quad->getObject()->getType();
}
}
$this->addTriple($subject, $predicate, $object);
}
return $this->tripleCount;
}
}
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