/php/core/vendor/easyrdf/easyrdf/lib/EasyRdf/Serialiser/Ntriples.php
PHP | 221 lines | 162 code | 7 blank | 52 comment | 10 complexity | 69ccc87daa58a30f57e6408f8c5779b3 MD5 | raw file
Possible License(s): BSD-3-Clause, GPL-2.0, LGPL-2.1
- <?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"
- );
- }
- }
- }