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<?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 parse RDF using Redland (librdf) C library.
*
* @package EasyRdf
* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
* @license http://www.opensource.org/licenses/bsd-license.php
*/
class EasyRdf_Parser_Redland extends EasyRdf_Parser
{
/** Variable set to the librdf world */
private $world = null;
/** Parser feature URI string for getting the error count of last parse. */
const LIBRDF_PARSER_FEATURE_ERROR_COUNT =
'http://feature.librdf.org/parser-error-count';
/*
* Types supported by Redland:
*
* ntriples: N-Triples
* turtle: Turtle Terse RDF Triple Language
* trig: TriG - Turtle with Named Graphs
* rss-tag-soup: RSS Tag Soup
* grddl: Gleaning Resource Descriptions from Dialects of Languages
* guess: Pick the parser to use using content type and URI
* rdfa: RDF/A via librdfa
* raptor: (null)
* rdfxml: RDF/XML
*/
/**
* Convert a librdf node type into a string
* @ignore
*/
protected function nodeTypeString($node)
{
switch(librdf_node_get_type($node)) {
case 1:
return 'uri';
break;
case 2:
return 'literal';
break;
case 4:
return 'bnode';
break;
default:
return 'unknown';
break;
}
}
/**
* Convert the URI for a node into a string
* @ignore
*/
protected function nodeUriString($node)
{
$type = EasyRdf_Parser_Redland::nodeTypeString($node);
if ($type == 'uri') {
$uri = librdf_node_get_uri($node);
if (!$uri) {
throw new EasyRdf_Exception("Failed to get URI of node");
}
$str = librdf_uri_to_string($uri);
if (!$str) {
throw new EasyRdf_Exception(
"Failed to convert librdf_uri to string"
);
}
return $str;
} elseif ($type == 'bnode') {
return $this->remapBnode(
librdf_node_get_blank_identifier($node)
);
} else {
throw new EasyRdf_Exception("Unsupported type: ".$type);
}
}
/**
* Convert a node into an associate array
* @ignore
*/
protected function nodeToRdfPhp($node)
{
$object = array();
$object['type'] = EasyRdf_Parser_Redland::nodeTypeString($node);
if ($object['type'] == 'uri') {
$object['value'] = EasyRdf_Parser_Redland::nodeUriString($node);
} elseif ($object['type'] == 'bnode') {
$object['value'] = '_:'.librdf_node_get_blank_identifier($node);
} elseif ($object['type'] == 'literal') {
$object['value'] = librdf_node_get_literal_value($node);
$lang = librdf_node_get_literal_value_language($node);
if ($lang) {
$object['lang'] = $lang;
}
$datatype = librdf_node_get_literal_value_datatype_uri($node);
if ($datatype) {
$object['datatype'] = librdf_uri_to_string($datatype);
}
} else {
throw new EasyRdf_Exception("Unsupported type: ".$object['type']);
}
return $object;
}
/**
* Return the number of errors during parsing
* @ignore
*/
protected function parserErrorCount($parser)
{
$errorUri = librdf_new_uri(
$this->world,
self::LIBRDF_PARSER_FEATURE_ERROR_COUNT
);
$errorNode = librdf_parser_get_feature($parser, $errorUri);
$errorCount = librdf_node_get_literal_value($errorNode);
librdf_free_uri($errorUri);
return $errorCount;
}
/**
* Constructor
*
* @return object EasyRdf_Parser_Redland
*/
public function __construct()
{
if (extension_loaded('redland')) {
$this->world = librdf_php_get_world();
if (!$this->world) {
throw new EasyRdf_Exception(
"Failed to initialise librdf world."
);
}
} else {
throw new EasyRdf_Exception(
"Redland PHP extension is not available."
);
}
}
/**
* Parse an RDF document 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, $baseUri)
{
parent::checkParseParams($graph, $data, $format, $baseUri);
$parser = librdf_new_parser($this->world, $format, null, null);
if (!$parser) {
throw new EasyRdf_Exception(
"Failed to create librdf_parser of type: $format"
);
}
$rdfUri = librdf_new_uri($this->world, $baseUri);
if (!$rdfUri) {
throw new EasyRdf_Exception(
"Failed to create librdf_uri from: $baseUri"
);
}
$stream = librdf_parser_parse_string_as_stream($parser, $data, $rdfUri);
if (!$stream) {
throw new EasyRdf_Parser_Exception(
"Failed to parse RDF stream"
);
}
do {
$statement = librdf_stream_get_object($stream);
if ($statement) {
$subject = EasyRdf_Parser_Redland::nodeUriString(
librdf_statement_get_subject($statement)
);
$predicate = EasyRdf_Parser_Redland::nodeUriString(
librdf_statement_get_predicate($statement)
);
$object = EasyRdf_Parser_Redland::nodeToRdfPhp(
librdf_statement_get_object($statement)
);
$this->addTriple($subject, $predicate, $object);
}
} while (!librdf_stream_next($stream));
$errorCount = $this->parserErrorCount($parser);
if ($errorCount) {
throw new EasyRdf_Parser_Exception("$errorCount errors while parsing.");
}
librdf_free_uri($rdfUri);
librdf_free_stream($stream);
librdf_free_parser($parser);
return $this->tripleCount;
}
}