| 1 | <?php
|
|---|
| 2 | // ----------------------------------------------------------------------------------
|
|---|
| 3 | // Class: RdfParser
|
|---|
| 4 | // ----------------------------------------------------------------------------------
|
|---|
| 5 |
|
|---|
| 6 |
|
|---|
| 7 | /**
|
|---|
| 8 | * A GRDDLParser.
|
|---|
| 9 | * This class extracts rdf data from xhtml documents. It uses the PHP xsltprocessor.
|
|---|
| 10 | * Gleaning Resource Descriptions from Dialects of Languages (GRDDL):
|
|---|
| 11 | * (http://www.w3.org/TR/grddl/)
|
|---|
| 12 | *
|
|---|
| 13 | * @version $Id: GRDDLParser.php 320 2006-11-21 09:38:51Z tgauss $
|
|---|
| 14 | * @author Tobias Gauß <tobias.gauss@web.de>,
|
|---|
| 15 | *
|
|---|
| 16 | * @package syntax
|
|---|
| 17 | * @access public
|
|---|
| 18 | *
|
|---|
| 19 | */
|
|---|
| 20 | class GRDDLParser extends Object{
|
|---|
| 21 |
|
|---|
| 22 |
|
|---|
| 23 | /**
|
|---|
| 24 | * Document link
|
|---|
| 25 | *
|
|---|
| 26 | *
|
|---|
| 27 | * @var String
|
|---|
| 28 | * @access private
|
|---|
| 29 | */
|
|---|
| 30 | var $doclink;
|
|---|
| 31 |
|
|---|
| 32 |
|
|---|
| 33 | /**
|
|---|
| 34 | * Stylesheet link
|
|---|
| 35 | *
|
|---|
| 36 | *
|
|---|
| 37 | * @var String[]
|
|---|
| 38 | * @access private
|
|---|
| 39 | */
|
|---|
| 40 | var $stylelinks;
|
|---|
| 41 |
|
|---|
| 42 |
|
|---|
| 43 | /**
|
|---|
| 44 | * DomDocument
|
|---|
| 45 | *
|
|---|
| 46 | * @var DomDocument
|
|---|
| 47 | * @access private
|
|---|
| 48 | */
|
|---|
| 49 | var $domdoc;
|
|---|
| 50 |
|
|---|
| 51 |
|
|---|
| 52 | /**
|
|---|
| 53 | * generates a MemModel and creates the DomDocument.
|
|---|
| 54 | *
|
|---|
| 55 | * @param String $doc
|
|---|
| 56 | * @access public
|
|---|
| 57 | * @return MemModel $model
|
|---|
| 58 | */
|
|---|
| 59 | function generateModel($doc){
|
|---|
| 60 | $model = new MemModel();
|
|---|
| 61 | $this->doclink=$doc;
|
|---|
| 62 | $this->domdoc = new DomDocument;
|
|---|
| 63 | $this->domdoc->load($doc);
|
|---|
| 64 | $this->_getStyles();
|
|---|
| 65 | $model = $this->_generateRDF();
|
|---|
| 66 | return $model;
|
|---|
| 67 | }
|
|---|
| 68 |
|
|---|
| 69 |
|
|---|
| 70 | /**
|
|---|
| 71 | * gets the used xsl stylesheets.
|
|---|
| 72 | *
|
|---|
| 73 | * @access private
|
|---|
| 74 | */
|
|---|
| 75 | function _getStyles(){
|
|---|
| 76 | $link=$this->domdoc->getElementsByTagName('link');
|
|---|
| 77 | $i=0;
|
|---|
| 78 | while($link->item($i)!=''){
|
|---|
| 79 | $item = $link->item($i);
|
|---|
| 80 | if($item->getAttributeNode('rel')->value=='transformation'){
|
|---|
| 81 | $temp = $item->getAttributeNode('href')->value;
|
|---|
| 82 | if(substr($temp,0,1)=='/'){
|
|---|
| 83 | $pos = strrpos($this->doclink,'/');
|
|---|
| 84 | $part = substr($this->doclink,0,$pos);
|
|---|
| 85 | $this->stylelink[]=$part.$temp;
|
|---|
| 86 | }else{
|
|---|
| 87 | $this->stylelink[]=$temp;
|
|---|
| 88 | }
|
|---|
| 89 | }
|
|---|
| 90 | $i++;
|
|---|
| 91 | }
|
|---|
| 92 | }
|
|---|
| 93 |
|
|---|
| 94 | /*
|
|---|
| 95 | * uses the PHP build in xslt processor to
|
|---|
| 96 | * generate the RDF statements and uses the
|
|---|
| 97 | * RDF- Parser to generate the model
|
|---|
| 98 | *
|
|---|
| 99 | * @access private
|
|---|
| 100 | * @return MemModel $model
|
|---|
| 101 | */
|
|---|
| 102 | function _generateRDF(){
|
|---|
| 103 | $model=new MemModel();
|
|---|
| 104 | $model->setBaseURI($this->doclink);
|
|---|
| 105 | $proc = new xsltprocessor;
|
|---|
| 106 | include_once(RDFAPI_INCLUDE_DIR.PACKAGE_SYNTAX_RDF);
|
|---|
| 107 | $pars=new RdfParser();
|
|---|
| 108 | foreach($this->stylelink as $key => $value){
|
|---|
| 109 | $xsl = new DomDocument;
|
|---|
| 110 | $xsl->load($value);
|
|---|
| 111 | $proc->importStyleSheet($xsl);
|
|---|
| 112 | $model->addModel($pars->generateModel($proc->transformToXML($this->domdoc),$this->doclink));
|
|---|
| 113 | }
|
|---|
| 114 | return $model;
|
|---|
| 115 | }
|
|---|
| 116 |
|
|---|
| 117 |
|
|---|
| 118 |
|
|---|
| 119 | }
|
|---|
| 120 | ?> |
|---|
