<?
/*
########################################################################                                        
Copyright 2007, Michael Schrenk                                                                                 
   This software is designed for use with the book,                                                             
   "Webbots, Spiders, and Screen Scarpers", Michael Schrenk, 2007 No Starch Press, San Francisco CA             
                                                                                                                
W3CŽ SOFTWARE NOTICE AND LICENSE                                                                                
                                                                                                                
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 By obtaining, using and/or copying this work, you (the licensee) agree that you have read,                     
 understood, and will comply with the following terms and conditions.                                           
                                                                                                                
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including modifications:                                                                                        
   1. The full text of this NOTICE in a location viewable to users of the redistributed                         
      or derivative work.                                                                                       
   2. Any pre-existing intellectual property disclaimers, notices, or terms and conditions.                     
      If none exist, the W3C Software Short Notice should be included (hypertext is preferred,                  
      text is permitted) within the body of any redistributed or derivative code.                               
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THIS SOFTWARE AND DOCUMENTATION IS PROVIDED "AS IS," AND COPYRIGHT HOLDERS MAKE NO REPRESENTATIONS OR           
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OF ANY USE OF THE SOFTWARE OR DOCUMENTATION.                                                                    
                                                                                                                
The name and trademarks of copyright holders may NOT be used in advertising or publicity pertaining to the      
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documentation will at all times remain with copyright holders.                                                  
########################################################################                                        
*/

########################################################################
#                                                                       
# LIB_rss                                                               
#                                                                       
# Questa libreria fornisce delle routine utili per lavorare con i feed RSS
#                                                                       
#-----------------------------------------------------------------------
# FUNZIONI
#                                                                       
# download_parse_rss($target)                                           
#		    Scarica ed effettua il parsing di dati RSS
#                                                                       
# display_rss_array($rss_array)                                         
#		    Visualizza un feed RSS analizzato
#                                                                       
# strip_cdata_tags()                                                    
#           Rimuove i tag cdata[] da una stringa
#                                                                       
#-----------------------------------------------------------------------

/***********************************************************************
download_parse_rss($target)     						                
-------------------------------------------------------------			
DESCRIZIONE:															
		Scarica ed effettua il parsing di dati RSS
INPUT:																    
		$target                                                         
            L'indirizzo web del feed RSS
OUTPUT:																
		Il feed RSS dopo il parsing
***********************************************************************/
function download_parse_rss($target)
    {
    //Scarica la pagina RSS
    $news = http_get($target, "");
    
    //Esegue il parsing del titolo e dell'avviso di copyright
    $rss_array['TITLE'] = return_between($news['FILE'], "<title>", "</title>", EXCL);
    $rss_array['COPYRIGHT'] = return_between($news['FILE'], "<copyright>", "</copyright>", EXCL);

    //Esegue il parsing degli oggetti
    $item_array = parse_array($news['FILE'], "<item>", "</item>");
    for($xx=0; $xx<count($item_array); $xx++)
        {
        $rss_array['ITITLE'][$xx] = return_between($item_array[$xx], "<title>", "</title>", EXCL);
        $rss_array['ILINK'][$xx] = return_between($item_array[$xx], "<link>", "</link>", EXCL);
        $rss_array['IDESCRIPTION'][$xx] = return_between($item_array[$xx], "<description>", "</description>", EXCL);
        $rss_array['IPUBDATE'][$xx] = return_between($item_array[$xx], "<pubDate>", "</pubDate>", EXCL);
        }

    return $rss_array;
    }

/***********************************************************************
display_rss_array($rss_array)     						                
-------------------------------------------------------------			
DESCRIZIONE:															
		Visualizza i dati RSS dopo il parsing
INPUT:																    
		$rss_array
            	L'array RSS restituito da download_parse_rss()
OUTPUT:																
		Visualizza i risultati sul dispositivo di output
***********************************************************************/
function display_rss_array($rss_array)
    {?>
    <table border="0">
        <!--Visualizza il titolo dell'articolo e le informazioni sul copyright -->
        <tr><td><font size="+1"><b><?echo strip_cdata_tags($rss_array['TITLE'])?></b></font></td></tr>
        <tr><td><?echo strip_cdata_tags($rss_array['COPYRIGHT'])?></td></tr>

        <!--Visualizza la descrizione e il link per ogni articolo -->
        <?for($xx=0; $xx<count($rss_array['ITITLE']); $xx++)
            {?>
            <tr>
                <td>
                    <a href="<?echo strip_cdata_tags($rss_array['ILINK'][$xx])?>">
                        <b><?echo strip_cdata_tags($rss_array['ITITLE'][$xx])?></b>
                    </a>
                </td>
            </tr>
            <tr>
                <td><?echo strip_cdata_tags($rss_array['IDESCRIPTION'][$xx])?></td>
            </tr>
            <tr>
                <td><font size="-1"><?echo strip_cdata_tags($rss_array['IPUBDATE'][$xx])?></font></td>
            </tr>
          <?}?>
    </table>
  <?}

/***********************************************************************
strip_cdata_tags($string)                                               
-------------------------------------------------------------			
DESCRIZIONE:															
		Rimuove i tag  CDATA da una stringa
                                                                        
INPUT:																    
		$string                                                         
            	Testo contenente tag CDDATA
OUTPUT:																
		Ritorna una stringa senza tag CDDATA
***********************************************************************/
function strip_cdata_tags($string)
    {
    // Rimuove i tag XML CDATA 
    $string = str_replace("<![CDATA[", "", $string);
    $string = str_replace("]]>", "", $string);
    return $string;
    }  
  ?>