--- /dev/null
+<?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 N-Triples
+ * with no external dependancies.
+ *
+ * @package EasyRdf
+ * @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
+ * @license http://www.opensource.org/licenses/bsd-license.php
+ */
+class EasyRdf_Serialiser_Ntriples extends EasyRdf_Serialiser
+{
+ private $escChars = array(); // Character encoding cache
+
+ /**
+ * @ignore
+ */
+ protected function escapeString($str)
+ {
+ if (strpos(utf8_decode(str_replace('?', '', $str)), '?') === false) {
+ $str = utf8_decode($str);
+ }
+
+ $result = '';
+ $strLen = strlen($str);
+ for ($i = 0; $i < $strLen; $i++) {
+ $c = $str[$i];
+ if (!isset($this->escChars[$c])) {
+ $this->escChars[$c] = $this->escapedChar($c);
+ }
+ $result .= $this->escChars[$c];
+ }
+ return $result;
+ }
+
+ /**
+ * @ignore
+ */
+ protected function unicodeCharNo($c)
+ {
+ $cUtf = utf8_encode($c);
+ $bl = strlen($cUtf); /* binary length */
+ $r = 0;
+ switch ($bl) {
+ case 1: /* 0####### (0-127) */
+ $r = ord($cUtf);
+ break;
+ case 2: /* 110##### 10###### = 192+x 128+x */
+ $r = ((ord($cUtf[0]) - 192) * 64) +
+ (ord($cUtf[1]) - 128);
+ break;
+ case 3: /* 1110#### 10###### 10###### = 224+x 128+x 128+x */
+ $r = ((ord($cUtf[0]) - 224) * 4096) +
+ ((ord($cUtf[1]) - 128) * 64) +
+ (ord($cUtf[2]) - 128);
+ break;
+ case 4: /* 1111#### 10###### 10###### 10###### = 240+x 128+x 128+x 128+x */
+ $r = ((ord($cUtf[0]) - 240) * 262144) +
+ ((ord($cUtf[1]) - 128) * 4096) +
+ ((ord($cUtf[2]) - 128) * 64) +
+ (ord($cUtf[3]) - 128);
+ break;
+ }
+ return $r;
+ }
+
+ /**
+ * @ignore
+ */
+ protected function escapedChar($c)
+ {
+ $no = $this->unicodeCharNo($c);
+
+ /* see http://www.w3.org/TR/rdf-testcases/#ntrip_strings */
+ if ($no < 9) {
+ return "\\u" . sprintf('%04X', $no); /* #x0-#x8 (0-8) */
+ } elseif ($no == 9) {
+ return '\t'; /* #x9 (9) */
+ } elseif ($no == 10) {
+ return '\n'; /* #xA (10) */
+ } elseif ($no < 13) {
+ return "\\u" . sprintf('%04X', $no); /* #xB-#xC (11-12) */
+ } elseif ($no == 13) {
+ return '\r'; /* #xD (13) */
+ } elseif ($no < 32) {
+ return "\\u" . sprintf('%04X', $no); /* #xE-#x1F (14-31) */
+ } elseif ($no < 34) {
+ return $c; /* #x20-#x21 (32-33) */
+ } elseif ($no == 34) {
+ return '\"'; /* #x22 (34) */
+ } elseif ($no < 92) {
+ return $c; /* #x23-#x5B (35-91) */
+ } elseif ($no == 92) {
+ return '\\'; /* #x5C (92) */
+ } elseif ($no < 127) {
+ return $c; /* #x5D-#x7E (93-126) */
+ } elseif ($no < 65536) {
+ return "\\u" . sprintf('%04X', $no); /* #x7F-#xFFFF (128-65535) */
+ } elseif ($no < 1114112) {
+ return "\\U" . sprintf('%08X', $no); /* #x10000-#x10FFFF (65536-1114111) */
+ } else {
+ return ''; /* not defined => ignore */
+ }
+ }
+
+ /**
+ * @ignore
+ */
+ protected function serialiseResource($res)
+ {
+ $escaped = $this->escapeString($res);
+ if (substr($res, 0, 2) == '_:') {
+ return $escaped;
+ } else {
+ return "<$escaped>";
+ }
+ }
+
+ /**
+ * Serialise an RDF value into N-Triples
+ *
+ * The value can either be an array in RDF/PHP form, or
+ * an EasyRdf_Literal or EasyRdf_Resource object.
+ *
+ * @param array|object $value An associative array or an object
+ * @throws EasyRdf_Exception
+ * @return string The RDF value serialised to N-Triples
+ */
+ public function serialiseValue($value)
+ {
+ if (is_object($value)) {
+ $value = $value->toRdfPhp();
+ }
+
+ if ($value['type'] == 'uri' or $value['type'] == 'bnode') {
+ return $this->serialiseResource($value['value']);
+ } elseif ($value['type'] == 'literal') {
+ $escaped = $this->escapeString($value['value']);
+ if (isset($value['lang'])) {
+ $lang = $this->escapeString($value['lang']);
+ return '"' . $escaped . '"' . '@' . $lang;
+ } elseif (isset($value['datatype'])) {
+ $datatype = $this->escapeString($value['datatype']);
+ return '"' . $escaped . '"' . "^^<$datatype>";
+ } else {
+ return '"' . $escaped . '"';
+ }
+ } else {
+ throw new EasyRdf_Exception(
+ "Unable to serialise object of type '".$value['type']."' to ntriples: "
+ );
+ }
+ }
+
+ /**
+ * Serialise an EasyRdf_Graph into N-Triples
+ *
+ * @param EasyRdf_Graph $graph An EasyRdf_Graph object.
+ * @param string $format The name of the format to convert to.
+ * @param array $options
+ * @throws EasyRdf_Exception
+ * @return string The RDF in the new desired format.
+ */
+ public function serialise($graph, $format, array $options = array())
+ {
+ parent::checkSerialiseParams($graph, $format);
+
+ if ($format == 'ntriples') {
+ $nt = '';
+ foreach ($graph->toRdfPhp() as $resource => $properties) {
+ foreach ($properties as $property => $values) {
+ foreach ($values as $value) {
+ $nt .= $this->serialiseResource($resource)." ";
+ $nt .= "<" . $this->escapeString($property) . "> ";
+ $nt .= $this->serialiseValue($value)." .\n";
+ }
+ }
+ }
+ return $nt;
+ } else {
+ throw new EasyRdf_Exception(
+ "EasyRdf_Serialiser_Ntriples does not support: $format"
+ );
+ }
+ }
+}
projects / yaffs-website / blobdiff