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+<?php
+
+/**
+ * EasyRdf
+ *
+ * LICENSE
+ *
+ * Copyright (c) 2009-2013 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) 2009-2013 Nicholas J Humfrey
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+
+/**
+ * Class to serialise an EasyRdf_Graph to JSON-LD
+ *
+ * @package EasyRdf
+ * @copyright Copyright (c) 2013 Alexey Zakhlestin
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Serialiser_JsonLd extends EasyRdf_Serialiser
+{
+ public function __construct()
+ {
+ if (!class_exists('\ML\JsonLD\JsonLD')) {
+ throw new LogicException('Please install "ml/json-ld" dependency to use JSON-LD serialisation');
+ }
+
+ parent::__construct();
+ }
+
+ /**
+ * @param EasyRdf_Graph $graph
+ * @param string $format
+ * @param array $options
+ * @throws EasyRdf_Exception
+ * @return string
+ */
+ public function serialise($graph, $format, array $options = array())
+ {
+ parent::checkSerialiseParams($graph, $format);
+
+ if ($format != 'jsonld') {
+ throw new EasyRdf_Exception(__CLASS__.' does not support: '.$format);
+ }
+
+
+ $ld_graph = new \ML\JsonLD\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'])) {
+ $_value = new \ML\JsonLD\LanguageTaggedString($value['value'], $value['lang']);
+ } elseif (isset($value['datatype'])) {
+ $_value = new \ML\JsonLD\TypedValue($value['value'], $value['datatype']);
+ } else {
+ $_value = $value['value'];
+ }
+ } else {
+ throw new EasyRdf_Exception(
+ "Unable to serialise object to JSON-LD: ".$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);
+
+ // expanded form
+ $data = $ld_graph->toJsonLd($use_native_types);
+
+ if ($should_compact) {
+ // compact form
+ $compact_context = isset($options['context']) ? $options['context'] : null;
+ $compact_options = array(
+ 'useNativeTypes' => $use_native_types,
+ 'base' => $graph->getUri()
+ );
+
+ $data = \ML\JsonLD\JsonLD::compact($data, $compact_context, $compact_options);
+ }
+
+ return \ML\JsonLD\JsonLD::toString($data);
+ }
+}