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[yaffs-website] / vendor / easyrdf / easyrdf / lib / EasyRdf / Serialiser / JsonLd_real.php

diff --git a/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/JsonLd_real.php b/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/JsonLd_real.php
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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);
+        $should_frame = isset($options['frame']);
+
+        // expanded form
+        $data = $ld_graph->toJsonLd($use_native_types);
+
+        if ($should_frame) {
+            $data = \ML\JsonLD\JsonLD::frame($data, $options['frame'], $options);
+
+        }
+
+        if ($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);
+    }
+}