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<?php
namespace EasyRdf\Parser;
/**
* EasyRdf
*
* LICENSE
*
* Copyright (c) 2009-2020 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) 2009-2020 Nicholas J Humfrey
* @license https://www.opensource.org/licenses/bsd-license.php
*/
use EasyRdf\Graph;
use EasyRdf\Parser;
/**
* A pure-php class to parse N-Triples with no dependencies.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2020 Nicholas J Humfrey
* @license https://www.opensource.org/licenses/bsd-license.php
*/
class Ntriples extends Parser
{
/**
* Decodes an encoded N-Triples string. Any \-escape sequences are substituted
* with their decoded value.
*
* @param string $str An encoded N-Triples string.
*
* @return string The unencoded string.
**/
protected function unescapeString($str)
{
if (strpos($str, '\\') === false) {
return $str;
}
$mappings = array(
't' => chr(0x09),
'b' => chr(0x08),
'n' => chr(0x0A),
'r' => chr(0x0D),
'f' => chr(0x0C),
'\"' => chr(0x22),
'\'' => chr(0x27)
);
foreach ($mappings as $in => $out) {
$str = preg_replace('/\x5c([' . $in . '])/', $out, $str);
}
if (stripos($str, '\u') === false) {
return $str;
}
while (preg_match('/\\\(U)([0-9A-F]{8})/', $str, $matches) ||
preg_match('/\\\(u)([0-9A-F]{4})/', $str, $matches)) {
$no = hexdec($matches[2]);
if ($no < 128) { // 0x80
$char = chr($no);
} elseif ($no < 2048) { // 0x800
$char = chr(($no >> 6) + 192) .
chr(($no & 63) + 128);
} elseif ($no < 65536) { // 0x10000
$char = chr(($no >> 12) + 224) .
chr((($no >> 6) & 63) + 128) .
chr(($no & 63) + 128);
} elseif ($no < 2097152) { // 0x200000
$char = chr(($no >> 18) + 240) .
chr((($no >> 12) & 63) + 128) .
chr((($no >> 6) & 63) + 128) .
chr(($no & 63) + 128);
} else {
# FIXME: throw an exception instead?
$char = '';
}
$str = str_replace('\\' . $matches[1] . $matches[2], $char, $str);
}
return $str;
}
/**
* @ignore
*/
protected function parseNtriplesSubject($sub, $lineNum)
{
if (preg_match('/<([^<>]+)>/', $sub, $matches)) {
return $this->unescapeString($matches[1]);
} elseif (preg_match('/_:([A-Za-z0-9]*)/', $sub, $matches)) {
if (empty($matches[1])) {
return $this->graph->newBNodeId();
} else {
$nodeid = $this->unescapeString($matches[1]);
return $this->remapBnode($nodeid);
}
} else {
throw new Exception(
"Failed to parse subject: $sub",
$lineNum
);
}
}
/**
* @ignore
*/
protected function parseNtriplesObject($obj, $lineNum)
{
if (preg_match('/"(.+)"\^\^<([^<>]+)>/', $obj, $matches)) {
return array(
'type' => 'literal',
'value' => $this->unescapeString($matches[1]),
'datatype' => $this->unescapeString($matches[2])
);
} elseif (preg_match('/"(.+)"@([\w\-]+)/', $obj, $matches)) {
return array(
'type' => 'literal',
'value' => $this->unescapeString($matches[1]),
'lang' => $this->unescapeString($matches[2])
);
} elseif (preg_match('/"(.*)"/', $obj, $matches)) {
return array('type' => 'literal', 'value' => $this->unescapeString($matches[1]));
} elseif (preg_match('/<([^<>]+)>/', $obj, $matches)) {
return array('type' => 'uri', 'value' => $this->unescapeString($matches[1]));
} elseif (preg_match('/_:([A-Za-z0-9]*)/', $obj, $matches)) {
if (empty($matches[1])) {
return array(
'type' => 'bnode',
'value' => $this->graph->newBNodeId()
);
} else {
$nodeid = $this->unescapeString($matches[1]);
return array(
'type' => 'bnode',
'value' => $this->remapBnode($nodeid)
);
}
} else {
throw new Exception(
"Failed to parse object: $obj",
$lineNum
);
}
}
/**
* Parse an N-Triples document into an EasyRdf\Graph
*
* @param 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 $baseUri the base URI of the data being parsed
*
* @throws Exception
* @throws \EasyRdf\Exception
* @return integer The number of triples added to the graph
*/
public function parse($graph, $data, $format, $baseUri)
{
parent::checkParseParams($graph, $data, $format, $baseUri);
if ($format != 'ntriples') {
throw new \EasyRdf\Exception(
"EasyRdf\\Parser\\Ntriples does not support: $format"
);
}
$lines = preg_split('/\x0D?\x0A/', strval($data));
foreach ($lines as $index => $line) {
$lineNum = $index + 1;
if (preg_match('/^\s*#/', $line)) {
# Comment
continue;
} elseif (preg_match('/^\s*(.+?)\s+<([^<>]+?)>\s+(.+?)\s*\.\s*$/', $line, $matches)) {
$this->addTriple(
$this->parseNtriplesSubject($matches[1], $lineNum),
$this->unescapeString($matches[2]),
$this->parseNtriplesObject($matches[3], $lineNum)
);
} elseif (preg_match('/^\s*$/', $line)) {
# Blank line
continue;
} else {
throw new Exception(
"Failed to parse statement",
$lineNum
);
}
}
return $this->tripleCount;
}
}
|
