Version 1

[yaffs-website] / vendor / easyrdf / easyrdf / lib / EasyRdf / Parser / Json.php

diff --git a/vendor/easyrdf/easyrdf/lib/EasyRdf/Parser/Json.php b/vendor/easyrdf/easyrdf/lib/EasyRdf/Parser/Json.php
new file mode 100644 (file)
index 0000000..924abdc
--- /dev/null
+++ b/vendor/easyrdf/easyrdf/lib/EasyRdf/Parser/Json.php
@@ -0,0 +1,156 @@
+<?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
+ */
+
+/**
+ * A pure-php class to parse RDF/JSON with no dependancies.
+ *
+ * http://n2.talis.com/wiki/RDF_JSON_Specification
+ * docs/appendix-a-rdf-formats-json.md
+ *
+ * @package    EasyRdf
+ * @copyright  Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license    http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Parser_Json extends EasyRdf_Parser_RdfPhp
+{
+    private $jsonLastErrorExists = false;
+
+    /**
+     * Constructor
+     *
+     * @return object EasyRdf_Parser_Json
+     */
+    public function __construct()
+    {
+        $this->jsonLastErrorExists = function_exists('json_last_error');
+    }
+
+    /** Return the last JSON parser error as a string
+     *
+     * If json_last_error() is not available a generic message will be returned.
+     *
+     * @ignore
+     */
+    protected function jsonLastErrorString()
+    {
+        if ($this->jsonLastErrorExists) {
+            switch (json_last_error()) {
+                case JSON_ERROR_NONE:
+                    return null;
+                case JSON_ERROR_DEPTH:
+                    return "JSON Parse error: the maximum stack depth has been exceeded";
+                case JSON_ERROR_STATE_MISMATCH:
+                    return "JSON Parse error: invalid or malformed JSON";
+                case JSON_ERROR_CTRL_CHAR:
+                    return "JSON Parse error: control character error, possibly incorrectly encoded";
+                case JSON_ERROR_SYNTAX:
+                    return "JSON Parse syntax error";
+                case JSON_ERROR_UTF8:
+                    return "JSON Parse error: malformed UTF-8 characters, possibly incorrectly encoded";
+                default:
+                    return "JSON Parse error: unknown";
+            }
+        } else {
+            return "JSON Parse error";
+        }
+    }
+
+    /** Parse the triple-centric JSON format, as output by libraptor
+     *
+     * http://librdf.org/raptor/api/serializer-json.html
+     *
+     * @ignore
+     */
+    protected function parseJsonTriples($data, $baseUri)
+    {
+        foreach ($data['triples'] as $triple) {
+            if ($triple['subject']['type'] == 'bnode') {
+                $subject = $this->remapBnode($triple['subject']['value']);
+            } else {
+                $subject = $triple['subject']['value'];
+            }
+
+            $predicate = $triple['predicate']['value'];
+
+            if ($triple['object']['type'] == 'bnode') {
+                $object = array(
+                    'type' => 'bnode',
+                    'value' => $this->remapBnode($triple['object']['value'])
+                );
+            } else {
+                $object = $triple['object'];
+            }
+
+            $this->addTriple($subject, $predicate, $object);
+        }
+
+        return $this->tripleCount;
+    }
+
+    /**
+      * Parse RDF/JSON into an EasyRdf_Graph
+      *
+      * @param object EasyRdf_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               $baseUri the base URI of the data being parsed
+      * @return integer             The number of triples added to the graph
+      */
+    public function parse($graph, $data, $format, $baseUri)
+    {
+        $this->checkParseParams($graph, $data, $format, $baseUri);
+
+        if ($format != 'json') {
+            throw new EasyRdf_Exception(
+                "EasyRdf_Parser_Json does not support: $format"
+            );
+        }
+
+        $decoded = @json_decode(strval($data), true);
+        if ($decoded === null) {
+            throw new EasyRdf_Parser_Exception(
+                $this->jsonLastErrorString()
+            );
+        }
+
+        if (array_key_exists('triples', $decoded)) {
+            return $this->parseJsonTriples($decoded, $baseUri);
+        } else {
+            return parent::parse($graph, $decoded, 'php', $baseUri);
+        }
+    }
+}