727 lines
27 KiB
PHP
727 lines
27 KiB
PHP
<?php
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/**
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* EasyRdf
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*
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* LICENSE
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*
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* Copyright (c) 2012-2013 Nicholas J Humfrey.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author 'Nicholas J Humfrey" may be used to endorse or
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* promote products derived from this software without specific prior
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* written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package EasyRdf
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* @copyright Copyright (c) 2009-2013 Nicholas J Humfrey
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* Copyright (c) 1997-2006 Aduna (http://www.aduna-software.com/)
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* @license http://www.opensource.org/licenses/bsd-license.php
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*/
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/**
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* Class to parse RDFa 1.1 with no external dependancies.
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*
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* http://www.w3.org/TR/rdfa-core/
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*
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* @package EasyRdf
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* @copyright Copyright (c) 2012-2013 Nicholas J Humfrey
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* @license http://www.opensource.org/licenses/bsd-license.php
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*/
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class EasyRdf_Parser_Rdfa extends EasyRdf_Parser
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{
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const XML_NS = 'http://www.w3.org/XML/1998/namespace';
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const RDF_XML_LITERAL = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#XMLLiteral';
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const TERM_REGEXP = '/^([a-zA-Z_])([0-9a-zA-Z_\.-]*)$/';
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public $debug = false;
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/**
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* Constructor
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*
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* @return object EasyRdf_Parser_Rdfa
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*/
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public function __construct()
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{
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}
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protected function addTriple($resource, $property, $value)
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{
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if ($this->debug) {
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print "Adding triple: $resource -> $property -> ".$value['type'].':'.$value['value']."\n";
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}
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$count = $this->graph->add($resource, $property, $value);
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$this->tripleCount += $count;
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return $count;
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}
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protected function generateList($subject, $property, $list)
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{
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$current = $subject;
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$prop = $property;
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// Output a blank node for each item in the list
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foreach ($list as $item) {
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$newNode = $this->graph->newBNodeId();
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$this->addTriple($current, $prop, array('type' => 'bnode', 'value' => $newNode));
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$this->addTriple($newNode, 'rdf:first', $item);
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$current = $newNode;
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$prop = 'rdf:rest';
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}
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// Finally, terminate the list
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$this->addTriple(
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$current,
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$prop,
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array('type' => 'uri', 'value' => EasyRdf_Namespace::expand('rdf:nil'))
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);
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}
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protected function addToList($listMapping, $property, $value)
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{
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if ($this->debug) {
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print "Adding to list: $property -> ".$value['type'].':'.$value['value']."\n";
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}
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// Create property in the list mapping if it doesn't already exist
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if (!isset($listMapping->$property)) {
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$listMapping->$property = array();
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}
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array_push($listMapping->$property, $value);
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}
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protected function printNode($node, $depth)
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{
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$indent = str_repeat(' ', $depth);
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print $indent;
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switch($node->nodeType) {
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case XML_ELEMENT_NODE:
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print 'node';
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break;
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case XML_ATTRIBUTE_NODE:
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print 'attr';
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break;
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case XML_TEXT_NODE:
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print 'text';
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break;
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case XML_CDATA_SECTION_NODE:
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print 'cdata';
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break;
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case XML_ENTITY_REF_NODE:
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print 'entref';
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break;
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case XML_ENTITY_NODE:
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print 'entity';
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break;
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case XML_PI_NODE:
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print 'pi';
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break;
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case XML_COMMENT_NODE:
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print 'comment';
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break;
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case XML_DOCUMENT_NODE:
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print 'doc';
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break;
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case XML_DOCUMENT_TYPE_NODE:
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print 'doctype';
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break;
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case XML_HTML_DOCUMENT_NODE:
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print 'html';
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break;
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default:
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throw new EasyRdf_Exception("unknown node type: ".$node->nodeType);
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break;
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}
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print ' '.$node->nodeName."\n";
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if ($node->hasAttributes()) {
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foreach ($node->attributes as $attr) {
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print $indent.' '.$attr->nodeName." => ".$attr->nodeValue."\n";
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}
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}
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}
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protected function guessTimeDatatype($value)
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{
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if (preg_match('/^-?\d{4}-\d{2}-\d{2}(Z|[\-\+]\d{2}:\d{2})?$/', $value)) {
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return 'http://www.w3.org/2001/XMLSchema#date';
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} elseif (preg_match('/^\d{2}:\d{2}:\d{2}(Z|[\-\+]\d{2}:\d{2})?$/', $value)) {
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return 'http://www.w3.org/2001/XMLSchema#time';
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} elseif (preg_match('/^-?\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(Z|[\-\+]\d{2}:\d{2})?$/', $value)) {
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return 'http://www.w3.org/2001/XMLSchema#dateTime';
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} elseif (preg_match('/^P(\d+Y)?(\d+M)?(\d+D)?T?(\d+H)?(\d+M)?(\d+S)?$/', $value)) {
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return 'http://www.w3.org/2001/XMLSchema#duration';
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} elseif (preg_match('/^\d{4}$/', $value)) {
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return 'http://www.w3.org/2001/XMLSchema#gYear';
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} elseif (preg_match('/^\d{4}-\d{2}$/', $value)) {
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return 'http://www.w3.org/2001/XMLSchema#gYearMonth';
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} else {
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return null;
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}
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}
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protected function initialContext()
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{
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$context = array(
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'prefixes' => array(),
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'vocab' => null,
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'subject' => $this->baseUri,
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'property' => null,
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'object' => null,
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'terms' => array(),
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'incompleteRels' => array(),
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'incompleteRevs' => array(),
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'listMapping' => null,
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'lang' => null,
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'path' => '',
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'xmlns' => array(),
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);
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// Set the default prefix
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$context['prefixes'][''] = 'http://www.w3.org/1999/xhtml/vocab#';
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// RDFa 1.1 default term mapping
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$context['terms']['describedby'] = 'http://www.w3.org/2007/05/powder-s#describedby';
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$context['terms']['license'] = 'http://www.w3.org/1999/xhtml/vocab#license';
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$context['terms']['role'] = 'http://www.w3.org/1999/xhtml/vocab#role';
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return $context;
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}
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protected function expandCurie($node, &$context, $value)
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{
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if (preg_match('/^(\w*?):(.*)$/', $value, $matches)) {
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list (, $prefix, $local) = $matches;
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$prefix = strtolower($prefix);
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if ($prefix === '_') {
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// It is a bnode
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return $this->remapBnode(substr($value, 2));
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} elseif (empty($prefix) and $context['vocab']) {
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// Empty prefix
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return $context['vocab'] . $local;
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} elseif (isset($context['prefixes'][$prefix])) {
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return $context['prefixes'][$prefix] . $local;
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} elseif ($uri = $node->lookupNamespaceURI($prefix)) {
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return $uri . $local;
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} elseif (!empty($prefix) and $uri = EasyRdf_Namespace::get($prefix)) {
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// Expand using well-known prefixes
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return $uri . $local;
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}
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}
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}
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protected function processUri($node, &$context, $value, $isProp = false)
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{
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if (preg_match('/^\[(.*)\]$/', $value, $matches)) {
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// Safe CURIE
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return $this->expandCurie($node, $context, $matches[1]);
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} elseif (preg_match(self::TERM_REGEXP, $value) and $isProp) {
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$term = strtolower($value);
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if ($context['vocab']) {
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return $context['vocab'] . $value;
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} elseif (isset($context['terms'][$term])) {
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return $context['terms'][$term];
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}
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} elseif (substr($value, 0, 2) === '_:' and $isProp) {
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return null;
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} else {
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$uri = $this->expandCurie($node, $context, $value);
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if ($uri) {
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return $uri;
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} else {
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$parsed = new EasyRdf_ParsedUri($value);
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if ($parsed->isAbsolute()) {
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return $value;
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} elseif ($isProp) {
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// Properties can't be relative URIs
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return null;
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} elseif ($this->baseUri) {
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return $this->baseUri->resolve($parsed);
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}
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}
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}
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}
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protected function processUriList($node, $context, $values)
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{
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if (!$values) {
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return array();
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}
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$uris = array();
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foreach (preg_split('/\s+/', $values) as $value) {
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$uri = $this->processUri($node, $context, $value, true);
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if ($uri) {
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array_push($uris, $uri);
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}
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}
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return $uris;
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}
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protected function getUriAttribute($node, &$context, $attributes)
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{
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if (!is_array($attributes)) {
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$attributes = array($attributes);
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}
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// Find the first attribute that returns a valid URI
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foreach ($attributes as $attribute) {
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if ($node->hasAttribute($attribute)) {
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$value = $node->getAttribute($attribute);
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$uri = $this->processUri($node, $context, $value);
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if ($uri) {
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return $uri;
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}
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}
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}
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}
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protected function processNode($node, &$context, $depth = 1)
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{
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if ($this->debug) {
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$this->printNode($node, $depth);
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}
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// Step 1: establish local variables
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$skip = false;
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$subject = null;
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$typedResource = null;
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$object = null;
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$rels = array();
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$revs = array();
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$lang = $context['lang'];
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$incompleteRels = array();
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$incompleteRevs = array();
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if ($node->nodeType === XML_ELEMENT_NODE) {
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$context['path'] .= '/' . $node->nodeName;
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$content = $node->hasAttribute('content') ? $node->getAttribute('content') : null;
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$datatype = $node->hasAttribute('datatype') ? $node->getAttribute('datatype') : null;
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$property = $node->getAttribute('property') ? $node->getAttribute('property') : null;
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$typeof = $node->getAttribute('typeof') ? $node->getAttribute('typeof') : null;
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// Step 2: Default vocabulary
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if ($node->hasAttribute('vocab')) {
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$context['vocab'] = $node->getAttribute('vocab');
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if ($context['vocab']) {
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$this->addTriple(
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$this->baseUri,
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'rdfa:usesVocabulary',
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array('type' => 'uri', 'value' => $context['vocab'])
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);
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}
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}
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// Step 3: Set prefix mappings
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// Support for deprecated xmlns if present in document
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foreach ($context['xmlns'] as $prefix => $uri) {
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if ($node->hasAttribute('xmlns:' . $prefix)) {
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$context['prefixes'][$prefix] = $node->getAttribute('xmlns:' . $prefix);
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if ($this->debug) {
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print "Prefix (xmlns): $prefix => $uri\n";
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}
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}
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}
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if ($node->hasAttribute('prefix')) {
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$mappings = preg_split('/\s+/', $node->getAttribute('prefix'));
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while (count($mappings)) {
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$prefix = strtolower(array_shift($mappings));
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$uri = array_shift($mappings);
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if (substr($prefix, -1) === ':') {
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$prefix = substr($prefix, 0, -1);
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} else {
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continue;
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}
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if ($prefix === '_') {
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continue;
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} elseif (!empty($prefix)) {
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$context['prefixes'][$prefix] = $uri;
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if ($this->debug) {
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print "Prefix: $prefix => $uri\n";
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}
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}
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}
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}
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// Step 4
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if ($node->hasAttributeNS(self::XML_NS, 'lang')) {
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$lang = $node->getAttributeNS(self::XML_NS, 'lang');
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} elseif ($node->hasAttribute('lang')) {
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$lang = $node->getAttribute('lang');
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}
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// HTML+RDFa 1.1: ignore rel and rev unless they contain CURIEs.
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foreach (array('rel', 'rev') as $attr) {
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if ($node->hasAttribute('property') and $node->hasAttribute($attr)) {
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// Quick check in case there are no CURIEs to deal with.
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if (strpos($node->getAttribute($attr), ':') === false) {
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$node->removeAttribute($attr);
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} else {
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// Only keep CURIEs.
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$curies = array();
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foreach (preg_split('/\s+/', $node->getAttribute($attr)) as $token) {
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if (strpos($token, ':')) {
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$curies[] = $token;
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}
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}
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$node->setAttribute($attr, implode(' ', $curies));
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}
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}
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}
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$rels = $this->processUriList($node, $context, $node->getAttribute('rel'));
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$revs = $this->processUriList($node, $context, $node->getAttribute('rev'));
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if (!$node->hasAttribute('rel') and !$node->hasAttribute('rev')) {
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// Step 5: Establish a new subject if no rel/rev
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if ($property and is_null($content) and is_null($datatype)) {
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$subject = $this->getUriAttribute($node, $context, 'about');
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if ($typeof and !$subject) {
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$typedResource = $this->getUriAttribute(
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$node,
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$context,
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array('resource', 'href', 'src')
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);
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if (!$typedResource) {
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$typedResource = $this->graph->newBNodeId();
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}
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$object = $typedResource;
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}
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} else {
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$subject = $this->getUriAttribute(
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$node,
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$context,
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array('about', 'resource', 'href', 'src')
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);
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}
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// Establish a subject if there isn't one
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# FIXME: refactor this
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if (is_null($subject)) {
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if ($context['path'] === '/html/head') {
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$subject = $context['object'];
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} elseif ($depth <= 2) {
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$subject = $this->baseUri;
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} elseif ($typeof and !$property) {
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$subject = $this->graph->newBNodeId();
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} else {
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if (!$property) {
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$skip = true;
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}
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$subject = $context['object'];
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}
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}
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} else {
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// Step 6
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// If the current element does contain a @rel or @rev attribute, then the next step is to
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// establish both a value for new subject and a value for current object resource:
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$subject = $this->getUriAttribute($node, $context, 'about');
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$object = $this->getUriAttribute(
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$node,
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$context,
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array('resource', 'href', 'src')
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);
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if ($typeof) {
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if (!$object and !$subject) {
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$object = $this->graph->newBNodeId();
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}
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$typedResource = $subject ? $subject : $object;
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}
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# FIXME: if the element is the root element of the document
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# then act as if there is an empty @about present
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if (!$subject) {
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$subject = $context['object'];
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}
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}
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# FIXME: better place for this?
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if ($typeof and $subject and !$typedResource) {
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$typedResource = $subject;
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}
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// Step 7: Process @typeof if there is a subject
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if ($typedResource) {
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foreach ($this->processUriList($node, $context, $typeof) as $type) {
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$this->addTriple(
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$typedResource,
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'rdf:type',
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array('type' => 'uri', 'value' => $type)
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);
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}
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}
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// Step 8: Create new List mapping if the subject has changed
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if ($subject and $subject !== $context['subject']) {
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$listMapping = new StdClass();
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} else {
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$listMapping = $context['listMapping'];
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}
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// Step 9: Generate triples with given object
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if ($subject and $object) {
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foreach ($rels as $prop) {
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$obj = array('type' => 'uri', 'value' => $object);
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if ($node->hasAttribute('inlist')) {
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$this->addToList($listMapping, $prop, $obj);
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} else {
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$this->addTriple($subject, $prop, $obj);
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}
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}
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foreach ($revs as $prop) {
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$this->addTriple(
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$object,
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$prop,
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array('type' => 'uri', 'value' => $subject)
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);
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}
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} elseif ($rels or $revs) {
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// Step 10: Incomplete triples and bnode creation
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$object = $this->graph->newBNodeId();
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if ($rels) {
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if ($node->hasAttribute('inlist')) {
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foreach ($rels as $prop) {
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# FIXME: add support for incomplete lists
|
|
if (!isset($listMapping->$prop)) {
|
|
$listMapping->$prop = array();
|
|
}
|
|
}
|
|
} else {
|
|
$incompleteRels = $rels;
|
|
if ($this->debug) {
|
|
print "Incomplete rels: ".implode(',', $rels)."\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
if ($revs) {
|
|
$incompleteRevs = $revs;
|
|
if ($this->debug) {
|
|
print "Incomplete revs: ".implode(',', $revs)."\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
// Step 11: establish current property value
|
|
if ($subject and $property) {
|
|
$value = array();
|
|
|
|
if ($datatype) {
|
|
$datatype = $this->processUri($node, $context, $datatype, true);
|
|
}
|
|
|
|
if ($content !== null) {
|
|
$value['value'] = $content;
|
|
} elseif ($node->hasAttribute('datetime')) {
|
|
$value['value'] = $node->getAttribute('datetime');
|
|
$datetime = true;
|
|
} elseif ($datatype === '') {
|
|
$value['value'] = $node->textContent;
|
|
} elseif ($datatype === self::RDF_XML_LITERAL) {
|
|
$value['value'] = '';
|
|
foreach ($node->childNodes as $child) {
|
|
$value['value'] .= $child->C14N();
|
|
}
|
|
} elseif (is_null($datatype) and empty($rels) and empty($revs)) {
|
|
$value['value'] = $this->getUriAttribute(
|
|
$node,
|
|
$context,
|
|
array('resource', 'href', 'src')
|
|
);
|
|
|
|
if ($value['value']) {
|
|
$value['type'] = 'uri';
|
|
}
|
|
}
|
|
|
|
if (empty($value['value']) and $typedResource and !$node->hasAttribute('about')) {
|
|
$value['type'] = 'uri';
|
|
$value['value'] = $typedResource;
|
|
}
|
|
|
|
if (empty($value['value'])) {
|
|
$value['value'] = $node->textContent;
|
|
}
|
|
|
|
if (empty($value['type'])) {
|
|
$value['type'] = 'literal';
|
|
if ($datatype) {
|
|
$value['datatype'] = $datatype;
|
|
} elseif (isset($datetime) or $node->nodeName === 'time') {
|
|
$value['datatype'] = $this->guessTimeDatatype($value['value']);
|
|
}
|
|
|
|
if (empty($value['datatype']) and $lang) {
|
|
$value['lang'] = $lang;
|
|
}
|
|
}
|
|
|
|
// Add each of the properties
|
|
foreach ($this->processUriList($node, $context, $property) as $prop) {
|
|
if ($node->hasAttribute('inlist')) {
|
|
$this->addToList($listMapping, $prop, $value);
|
|
} elseif ($subject) {
|
|
$this->addTriple($subject, $prop, $value);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Step 12: Complete the incomplete triples from the evaluation context
|
|
if (!$skip and $subject and ($context['incompleteRels'] or $context['incompleteRevs'])) {
|
|
foreach ($context['incompleteRels'] as $prop) {
|
|
$this->addTriple(
|
|
$context['subject'],
|
|
$prop,
|
|
array('type' => 'uri', 'value' => $subject)
|
|
);
|
|
}
|
|
|
|
foreach ($context['incompleteRevs'] as $prop) {
|
|
$this->addTriple(
|
|
$subject,
|
|
$prop,
|
|
array('type' => 'uri', 'value' => $context['subject'])
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Step 13: create a new evaluation context and proceed recursively
|
|
if ($node->hasChildNodes()) {
|
|
if ($skip) {
|
|
$newContext = $context;
|
|
} else {
|
|
// Prepare a new evaluation context
|
|
$newContext = $context;
|
|
if ($object) {
|
|
$newContext['object'] = $object;
|
|
} elseif ($subject) {
|
|
$newContext['object'] = $subject;
|
|
} else {
|
|
$newContext['object'] = $context['subject'];
|
|
}
|
|
if ($subject) {
|
|
$newContext['subject'] = $subject;
|
|
}
|
|
$newContext['incompleteRels'] = $incompleteRels;
|
|
$newContext['incompleteRevs'] = $incompleteRevs;
|
|
if (isset($listMapping)) {
|
|
$newContext['listMapping'] = $listMapping;
|
|
}
|
|
}
|
|
|
|
// The language is always updated, even if skip is set
|
|
$newContext['lang'] = $lang;
|
|
|
|
foreach ($node->childNodes as $child) {
|
|
if ($child->nodeType === XML_ELEMENT_NODE) {
|
|
$this->processNode($child, $newContext, $depth+1);
|
|
}
|
|
}
|
|
}
|
|
|
|
// Step 14: create triples for lists
|
|
if (!empty($listMapping)) {
|
|
foreach ($listMapping as $prop => $list) {
|
|
if ($context['listMapping'] !== $listMapping) {
|
|
if ($this->debug) {
|
|
print "Need to create triples for $prop => ".count($list)." items\n";
|
|
}
|
|
$this->generateList($subject, $prop, $list);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Parse RDFa 1.1 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, $baseUri);
|
|
|
|
if ($format != 'rdfa') {
|
|
throw new EasyRdf_Exception(
|
|
"EasyRdf_Parser_Rdfa does not support: $format"
|
|
);
|
|
}
|
|
|
|
// Initialise evaluation context.
|
|
$context = $this->initialContext();
|
|
|
|
libxml_use_internal_errors(true);
|
|
|
|
// Parse the document into DOM
|
|
$doc = new DOMDocument();
|
|
// Attempt to parse the document as strict XML, and fall back to HTML
|
|
// if XML parsing fails.
|
|
if ($doc->loadXML($data, LIBXML_NONET)) {
|
|
if ($this->debug) {
|
|
print "Document was parsed as XML.";
|
|
}
|
|
// Collect all xmlns namespaces defined throughout the document.
|
|
$sxe = simplexml_import_dom($doc);
|
|
$context['xmlns'] = $sxe->getDocNamespaces(true);
|
|
unset($context['xmlns']['']);
|
|
} else {
|
|
$doc->loadHTML($data);
|
|
if ($this->debug) {
|
|
print "Document was parsed as HTML.";
|
|
}
|
|
}
|
|
|
|
// Establish the base for both XHTML and HTML documents.
|
|
$xpath = new DOMXPath($doc);
|
|
$xpath->registerNamespace('xh', "http://www.w3.org/1999/xhtml");
|
|
$nodeList = $xpath->query('/xh:html/xh:head/xh:base');
|
|
if ($node = $nodeList->item(0) and $href = $node->getAttribute('href')) {
|
|
$this->baseUri = new EasyRdf_ParsedUri($href);
|
|
}
|
|
$nodeList = $xpath->query('/html/head/base');
|
|
if ($node = $nodeList->item(0) and $href = $node->getAttribute('href')) {
|
|
$this->baseUri = new EasyRdf_ParsedUri($href);
|
|
}
|
|
|
|
// Remove the fragment from the base URI
|
|
$this->baseUri->setFragment(null);
|
|
|
|
// Recursively process XML nodes
|
|
$this->processNode($doc, $context);
|
|
|
|
return $this->tripleCount;
|
|
}
|
|
}
|