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<?php namespace EasyRdf\Serialiser; /** * EasyRdf * * LICENSE * * Copyright (c) 2009-2020 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) 2009-2020 Nicholas J Humfrey * @license https://www.opensource.org/licenses/bsd-license.php */ use EasyRdf\Exception; use EasyRdf\Graph; use EasyRdf\Serialiser; use ML\JsonLD as LD; /** * Class to serialise an EasyRdf\Graph to JSON-LD * * @package EasyRdf * @copyright Copyright (c) 2013 Alexey Zakhlestin * @license https://www.opensource.org/licenses/bsd-license.php */ class JsonLd extends Serialiser { public function __construct() { if (!class_exists('\ML\JsonLD\JsonLD')) { throw new \LogicException('Please install "ml/json-ld" dependency to use JSON-LD serialisation'); } } /** * Serialise an EasyRdf\Graph into a JSON-LD document. * * @param Graph $graph An EasyRdf\Graph object. * @param string $format The name of the format to convert to. * @param array $options * * @return string The RDF in the new desired format. * @throws Exception */ public function serialise(Graph $graph, $format, array $options = array()) { parent::checkSerialiseParams($format); if ($format != 'jsonld') { throw new Exception(__CLASS__.' does not support: '.$format); } $ld_graph = new LD\Graph(); $nodes = array(); // cache for id-to-node association foreach ($graph->toRdfPhp() as $resource => $properties) { if (array_key_exists($resource, $nodes)) { $node = $nodes[$resource]; } else { $node = $ld_graph->createNode($resource); $nodes[$resource] = $node; } foreach ($properties as $property => $values) { foreach ($values as $value) { if ($value['type'] == 'bnode' or $value['type'] == 'uri') { if (array_key_exists($value['value'], $nodes)) { $_value = $nodes[$value['value']]; } else { $_value = $ld_graph->createNode($value['value']); $nodes[$value['value']] = $_value; } } elseif ($value['type'] == 'literal') { if (isset($value['lang'])) { $_value = new LD\LanguageTaggedString($value['value'], $value['lang']); } elseif (isset($value['datatype'])) { $_value = new LD\TypedValue($value['value'], $value['datatype']); } else { $_value = $value['value']; } } else { throw new Exception( "Unable to serialise object to JSON-LD: ".$value['type'] ); } if ($property == "http://www.w3.org/1999/02/22-rdf-syntax-ns#type") { $node->addType($_value); } else { $node->addPropertyValue($property, $_value); } } } } // OPTIONS $use_native_types = !(isset($options['expand_native_types']) and $options['expand_native_types'] == true); $should_compact = (isset($options['compact']) and $options['compact'] == true); $should_expand = (isset($options['expand']) and $options['expand'] == true); $should_frame = isset($options['frame']); // expanded form $data = $ld_graph->toJsonLd($use_native_types); if ($should_frame) { $data = LD\JsonLD::frame($data, $options['frame'], $options); } elseif ($should_expand) { $data = LD\JsonLD::expand($data); } if ($should_compact) { // compact form $compact_context = isset($options['context']) ? $options['context'] : null; $compact_options = array( 'useNativeTypes' => $use_native_types, 'base' => $graph->getUri() ); $data = LD\JsonLD::compact($data, $compact_context, $compact_options); } return LD\JsonLD::toString($data); } }
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