/Output/ViewSemantics.php

<?php

/*

* Plugin Name: ViewSemantics

* Description: Display the RDF Data in the semantics tag as a HTML table

* @Version: 1.0

* @Author Falk Stehmann

* @Author Ivan Krishanik

*/



// ARC2 static class inclusion  

//include_once('semsol-arc2-495d10b/ARC2.php');







class ViewSemantics

{



    function ViewSemantics()

    {

        add_filter('the_content', array($this, 'runShortcode'), 2);

    }

    

    /**

     * Macht ShortCode "semantics" vor allen anderen Filtern.

     *

     * @param string $content

     * Der Inhalt des Posts.

     *

     * @return string

     * Gefilterter Inhalt des Posts.

     * 

     * @test_author Sergej Sintschilin

     * @test_date  20.06.2011 

     * @test_result OK

     */

    public function runShortcode($content)

    {

        remove_all_shortcodes();

        add_shortcode('semantics', array($this, 'semanticsToHtml'));

        $content = do_shortcode($content);

        return $content;

    }



    /**

     * converts ARC2 triples into a HTML table

     * @param string $triples

     * ARC2 triples

     * @return string

     * HTML table

     *

     * @test_author Ivan Krishanik

     * @test_date   31.05.2011 

     * @test_result OK

     * 

     * @test_author Falk Stehmann

     * @test_date   13.06.2011 

     * @test_result OK

     */

    public static function triplesToHtmlTable($triples)

    {    

       

        

        $table = array();

        //iterate over triples and merge same predicates 

        foreach ( $triples as $triple)

        {

            // get predicate and object

            $p = ViewSemantics::filterUri($triple['p']);

            $o = ViewSemantics::filterObject($triple);

            

            if(isset($table[$p])){

                $table[$p] = $table[$p].', '.$o;

            }else{

                $table[$p] = $o;

            }

        }

        

        $result .= '<table>';

        

        foreach( $table as $p => $o ){

            $result .= "<tr>";

            $result.= "<td>".$p."</td><td>".$o."</td>";

            $result .= "</tr>";          

        

        }

        

        $result .= "</table>";



        $result=ViewSemantics::addExportLinks($result);

        

        return $result;

    }

    /**

     * converts the uri in a readable form

     * kurzum: added $firstToUpper

     * FIXME: This Code Smells

     * 

     * @param array $u

     * the uri

     * @param boolean $firstToUpper=true

     * prints the first letter of the link text in upper case

     * @return string

     * HTML link

     * 

     * @test_author Falk Stehmann

     * @test_date   23.06.2011 

     * @test_result OK

     */

    public static function filterUri($u, $firstToUpper=true)

    {

        $x1 = substr(strrchr($u,"/"),1);

        if($x1 == '') {

            $x1= substr(strrchr(substr($u, 0, -1),"/"),1);    

        }

        $x2 = substr(strrchr($u,"#"),1);

         

        if(true){

            $x1 = ucfirst($x1);

            $x2 = ucfirst($x2);

            ucfirst($p);

        } 

                

        $uri= '<a href="'.$u.'">';

                

        if ( $x1 == "" ) $uri = $p.$x2; 

        else

            if ( $x2 == "" ) $uri .= $x1;

            else

                if(strlen($x1) < strlen($x2)) $uri .= $x1;

                else $uri .= $x2;

        return $uri.'</a>';

    }

    /**

     * converts the object of the triple in a readable form

     * @param array $t

     * the triple

     * @return string

     * filtered object

     * 

     * @test_author Falk Stehmann

     * @test_date   23.06.2011 

     * @test_result OK

     */

    public static function filterObject($triple)

    {

        //for these predicates, an image tag will be added to their objects

        $images = array("thumbnail", "picture", "http://catalogus-professorum.org/cpm/picture",

        "http://pcai042.informatik.uni-leipzig.de/thumbnail", "http://www.klappstuhlclub.de/wp/posts/thumbnail");

    

        $o=$triple['o'];

    

        if ($triple['o_datatype'] == 'http://www.w3.org/2001/XMLSchema#datetime')

        {

            $date = DateTime::createFromFormat(DateTime::W3C, $triple['o']);

            if ($date)

            {

                //$o = $date->format(DateTime::RSS);

                $o = $date->format('d.m.Y  H:i');

            }

        }

        

        if($triple['o_type'] == 'uri')

        {

            $o=ViewSemantics::filterUri($o);

        }

        if (in_array($triple['p'], $images)) // add img tag

        {                  

        	$o = '<img src="'.$triple['o'].'">';

        } 

        

        return $o;

    }

    

    /**

     * adds Export links to the parameter for RDF, JSON, N3 and Ntriple format

     * @param string $result

     * table without links

     * @return string

     * table with links added

     * 

     * @test_author Falk Stehmann

     * @test_date   23.06.2011 

     * @test_result OK

     */

    public static function addExportLinks($result)

    {

        //RDF Output

        $result .= '<a href="'.WP_PLUGIN_URL.'/RDF2WP/Output/linkedDataScript.php?id='.get_the_id().'&format=application/rdf%2Bxml">RDF</a>&nbsp;|&nbsp;';

        //JSON output

        $result .= '<a href="'.WP_PLUGIN_URL.'/RDF2WP/Output/linkedDataScript.php?id='.get_the_id().'&format=application/json%2Brdf">JSON</a>&nbsp;|&nbsp;';

        //N3 output

        $result .= '<a href="'.WP_PLUGIN_URL.'/RDF2WP/Output/linkedDataScript.php?id='.get_the_id().'&format=text/rdf%2Bn3">N3</a>&nbsp;|&nbsp;';

        //NTriples output

        $result .= '<a href="'.WP_PLUGIN_URL.'/RDF2WP/Output/linkedDataScript.php?id='.get_the_id().'&format=text/plain">NTriples</a>';

    

        return $result;

    }

    /**

     * converts semantic data in a given format into an HTML table

     * 

     * @param string $atts

     * attributes to the semantics tag

     * @param string $content

     * content in between the semantics tags

     * @return string

     * HTML table

     * 

     * @test_author Falk Stehmann

     * @test_date   13.06.2011 

     * @test_result OK

     */

    public static function semanticsToHtml($atts, $content)

    {

        $triples = array();

        

        //is called by the parser to pass the triples

    

        $handleTriple = function($triple) use (&$triples)

        {

            array_push($triples, $triple);

            

        };

        

        // choose the right parser

       

        switch($atts['format'])

        {

            case("infobox"):

                {

                    $parser = new KSCParser($content, get_permalink(get_the_id()));

                    $parser->parse($handleTriple);

                    break;

                }

            case("prof"):

                {

                    $parser = new ProfParser($content);

                    $parser->parse($handleTriple);

                    break;

                }



            default:

                return $content;



        }



        

        

        // convert triples to html

        return ViewSemantics::triplesToHtmlTable($triples);

    }

}



// bind ViewSemantics to the semantics tag

//add_shortcode('semantics',array('ViewSemantics', 'semanticsToHtml'));

?>