JsonLd_real.php in Zircon Profile 8

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vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/JsonLd_real.php

<?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);
  }

}

Classes

Name	Description
EasyRdf_Serialiser_JsonLd	Class to serialise an EasyRdf_Graph to JSON-LD