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   1  <?php
   2    /****************************************************************************/
   3    /* rdf.feed.class.php                                                       */
   4    /*                                                                          */
   5    /****************************************************************************/
   6    /* Copyright (c) 2004 Michael Jervis (mike@fuckingbrit.com)                 */
   7    /*                                                                          */
   8    /* This software is licensed under the terms of the ZLIB License:           */
   9    /*                                                                          */
  10    /* This software is provided 'as-is', without any express or implied        */
  11    /* warranty. In no event will the authors be held liable for any damages    */
  12    /* arising from the use of this software.                                   */
  13    /*                                                                          */
  14    /* Permission is granted to anyone to use this software for any purpose,    */
  15    /* including commercial applications, and to alter it and redistribute it   */
  16    /* freely, subject to the following restrictions:                           */
  17    /*                                                                          */
  18    /*  1. The origin of this software must not be misrepresented; you must not */
  19    /*     claim that you wrote the original software. If you use this software */
  20    /*     in a product, an acknowledgment in the product documentation would be*/
  21    /*     appreciated but is not required.                                     */
  22    /*                                                                          */
  23    /*  2. Altered source versions must be plainly marked as such, and must not */
  24    /*     be misrepresented as being the original software.                    */
  25    /*                                                                          */
  26    /*  3. This notice may not be removed or altered from any source            */
  27    /*     distribution.                                                        */
  28    /****************************************************************************/
  29  
  30    /**
  31      * Provides feed handlers for RDF 1.0
  32      *
  33      * @author Michael Jervis (mike@fuckingbrit.com)
  34      * @version 1.0
  35      */
  36  
  37    /**
  38     * RDF provides reading and writing of RDF 1.0 format syndication feeds.
  39     *
  40     * @author Michael Jervis (mike@fuckingbrit.com)
  41     * @copyright Michael Jervis 2004
  42     * @abstract
  43     */
  44    class RDF extends FeedParserBase
  45    {
  46      /**
  47        * @access private
  48        * @var boolean
  49        */
  50      var $_inItem;
  51  
  52      /**
  53        * @access private
  54        * @var array
  55        */
  56      var $_currentItem;
  57  
  58      function RDF()
  59      {
  60        $this->FeedParserBase();
  61        $this->_inItem = false;
  62      }
  63  
  64      /**
  65        * Format an article into an Atom 0.3 <entry> tag.
  66        *
  67        * Takes an associative article array and turns it into an XML definition
  68        * of an article. Uses merely title, link and summary.
  69        *
  70        * @param array $article Associative array describing an article.
  71        */
  72      function _formatArticle( $article )
  73      {
  74        $xml = "<item rdf:about=\"{$article['link']}\">\n";
  75        $xml .= '<title>'.$this->_safeXML( $article['title'] )."</title>\n";
  76        $xml .= '<link>'.$this->_safeXML( $article['link'] )."</link>\n";
  77        if( array_key_exists( 'author', $article ) )
  78        {
  79          $xml .= '<dc:creator>'.$article['author']."</dc:creator>\n";
  80        }
  81        if( array_key_exists( 'summary', $article ) )
  82        {
  83          if( strlen( $article['summary'] ) > 0 )
  84          {
  85            $xml .= '<content:encoded>'
  86                            . $this->_safeXML ($article['summary'])
  87                            . "</content:encoded>\n";
  88          }
  89        }
  90        if( is_array( $article->extensions ) )
  91        {
  92          foreach( $article->extensions as $extendingTag )
  93          {
  94              $xml .= "$extendingTag\n";
  95          }
  96        }
  97        $xml .= "</item>\n";
  98        return $xml;
  99      }
 100  
 101      /**
 102        * Return the formatted start of a feed.
 103        *
 104        * This will start the xml and create header information about the feed
 105        * itself.
 106        */
 107      function _feedHeader()
 108      {
 109        $xml = "<?xml version=\"1.0\" encoding=\"{$this->encoding}\"?>\n\n";
 110        $this->namespaces[] = 'xmlns:dc="http://purl.org/dc/elements/1.1/"';
 111        $this->namespaces[] = 'xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"';
 112        $this->namespaces[] = 'xmlns="http://purl.org/rss/1.0/"';
 113        $xml .= '<rdf:RDF'.$this->_injectNamespaces().">\n";
 114        $xml .= "<channel  rdf:about=\"{$this->feedlogo}\">\n";
 115        $xml .= "<title>".$this->_safeXML( $this->title )."</title>\n";
 116        $xml .= '<link>'.$this->_safeXML( $this->sitelink )."</link>\n";
 117        $xml .= '<description>'.$this->_safeXML( $this->description )."</description>\n";
 118        $xml .= '<dc:language>'.$this->lang."</dc:language>\n";
 119        if( strlen($this->feedlogo) > 0 )
 120        {
 121          $xml .= '<image rdf:resource="'.$this->_safeXML( $this->feedlogo )."\"/>\n";
 122        }
 123  
 124        if( strlen($this->sitecontact) > 0 )
 125        {
 126          $xml .= '<dc:creator>'.$this->sitecontact."</dc:creator>\n";
 127        }
 128        $xml .= "<items>\n<rdf:Seq/>\n</items>\n";
 129        if( strlen($this->feedlogo) > 0 )
 130        {
 131          $xml .= "<image  rdf:about=\"{$this->feedlogo}\">\n";
 132          $xml .= '<url>'.$this->_safeXML( $this->feedlogo )."</url>\n";
 133          $xml .= '<title>'.$this->_safeXML( $this->title )."</title>\n";
 134          $xml .= '<link>'.$this->_safeXML( $this->sitelink )."</link>\n";
 135          $xml .= "</image>\n";
 136        }
 137        if( is_array( $this->extensions ) )
 138        {
 139          foreach( $this->extensions as $extendingTag )
 140          {
 141              $xml .= "$extendingTag\n";
 142          }
 143        }
 144        $xml .= "</channel>\n";
 145  
 146        return $xml;
 147      }
 148  
 149      /**
 150        * Return the formatted end of a feed.
 151        *
 152        * just closes things off nicely.
 153        */
 154      function _feedFooter()
 155      {
 156        $xml = "</rdf:RDF>\n";
 157        return $xml;
 158      }
 159  
 160      /**
 161        * Handle the begining of an XML element
 162        *
 163        * This is called from the parserfactory once the type of data has been
 164        * determined. Standard XML_PARSER element handler.
 165        *
 166        * @author Michael Jervis (mike@fuckingbrit.com)
 167        * @copyright Michael Jervis 2004
 168        */
 169      function startElement($parser, $name, $attributes)
 170      {
 171        if( $name == 'ITEM' )
 172        {
 173          $this->_inItem = true;
 174          $this->_currentItem = array();
 175        }
 176        $this->_currentTag = $name;
 177      }
 178  
 179      /**
 180        * Handle the close of an XML element
 181        *
 182        * Called by the parserfactory during parsing.
 183        */
 184      function endElement($parser, $name)
 185      {
 186        if( $name == 'ITEM' )
 187        {
 188          $this->_inItem = false;
 189          $this->articles[] = $this->_currentItem;
 190        }
 191        $this->_currentTag = '';
 192      }
 193  
 194      /**
 195        * Handles character data.
 196        *
 197        * Called by the parserfactory during parsing.
 198        */
 199      function charData($parser, $data)
 200      {
 201        if( $this->_inItem )
 202        {
 203          if( $this->_currentTag == 'TITLE' )
 204          {
 205            if( empty( $this->_currentItem['title'] ) )
 206            {
 207              $this->_currentItem['title'] = $data;
 208            } else {
 209              $this->_currentItem['title'] .= $data;
 210            }
 211          } else if( $this->_currentTag == 'LINK' ) {
 212            if( empty( $this->_currentItem['link'] ) )
 213            {
 214              $this->_currentItem['link'] = $data;
 215            } else {
 216              $this->_currentItem['link'] .= $data;
 217            }
 218          } else if( $this->_currentTag == 'CONTENT:ENCODED' ) {
 219            if( empty( $this->_currentItem['summary'] ) )
 220            {
 221              $this->_currentItem['summary'] = $data;
 222            } else {
 223              $this->_currentItem['summary'] .= $data;
 224            }
 225          }
 226        } else {
 227          if( $this->_currentTag == 'TITLE' )
 228          {
 229            $this->title .= $data;
 230          } else if( $this->_currentTag == 'LINK' ) {
 231            $this->sitelink .= $data;
 232          } else if( $this->_currentTag == 'DESCRIPTION' ) {
 233            $this->description .= $data;
 234          }
 235        }
 236      }
 237    }