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<?php
/*
 ======================================================================
 lastRSS 0.9.1
 
 Simple yet powerfull PHP class to parse RSS files.
 
 by Vojtech Semecky, webmaster @ oslab . net
 
 Latest version, features, manual and examples:
     http://lastrss.oslab.net/

 ----------------------------------------------------------------------
 LICENSE

 This program is free software; you can redistribute it and/or
 modify it under the terms of the GNU General Public License (GPL)
 as published by the Free Software Foundation; either version 2
 of the License, or (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 GNU General Public License for more details.

 To read the license please visit http://www.gnu.org/copyleft/gpl.html
 ======================================================================
*/

/**
* lastRSS
* Simple yet powerfull PHP class to parse RSS files.
*/
class lastRSS {
    // -------------------------------------------------------------------
    // Public properties
    // -------------------------------------------------------------------
    var $default_cp = 'UTF-8';
    var $CDATA = 'nochange';
    var $cp = '';
    var $items_limit = 0;
    var $stripHTML = False;
    var $date_format = '';

    // -------------------------------------------------------------------
    // Private variables
    // -------------------------------------------------------------------
    var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
    var $itemtags = array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
    var $imagetags = array('title', 'url', 'link', 'width', 'height');
    var $textinputtags = array('title', 'description', 'name', 'link');

    // -------------------------------------------------------------------
    // Parse RSS file and returns associative array.
    // -------------------------------------------------------------------
    function Get ($rss_url) {
        // If CACHE ENABLED
        if ($this->cache_dir != '') {
            $cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
            $timedif = @(time() - filemtime($cache_file));
            if ($timedif < $this->cache_time) {
                // cached file is fresh enough, return cached array
                $result = unserialize(join('', file($cache_file)));
                // set 'cached' to 1 only if cached file is correct
                if ($result) $result['cached'] = 1;
            } else {
                // cached file is too old, create new
                $result = $this->Parse($rss_url);
                $serialized = serialize($result);
                if ($f = @fopen($cache_file, 'w')) {
                    fwrite ($f, $serialized, strlen($serialized));
                    fclose($f);
                }
                if ($result) $result['cached'] = 0;
            }
        }
        // If CACHE DISABLED >> load and parse the file directly
        else {
            $result = $this->Parse($rss_url);
            if ($result) $result['cached'] = 0;
        }
        // return result
        return $result;
    }
    

    // -------------------------------------------------------------------
    // Modification of preg_match(); return trimed field with index 1
    // from 'classic' preg_match() array output
    // -------------------------------------------------------------------
    function my_preg_match ($pattern, $subject) {
        // start regullar expression
        preg_match($pattern, $subject, $out);

// if there is some result... process it and return it
if(isset($out[1])) {
    // Process CDATA (if present)
    if ($this->CDATA == 'content') { // Get CDATA content (without CDATA tag)
        $out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
    } elseif ($this->CDATA == 'strip') { // Strip CDATA
        $out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
    }

    // If code page is set convert character encoding to required
    if ($this->cp != '')
        //$out[1] = $this->MyConvertEncoding($this->rsscp, $this->cp, $out[1]);
        $out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
    // Return result
    return trim($out[1]);
} else {
// if there is NO result, return empty string
    return '';
}
    }

// -------------------------------------------------------------------
// Replace HTML entities &something; by real characters
// -------------------------------------------------------------------
function unhtmlentities ($string) {
    // Get HTML entities table
    $trans_tbl = get_html_translation_table (HTML_ENTITIES, ENT_QUOTES);
    // Flip keys<==>values
    $trans_tbl = array_flip ($trans_tbl);
    // Add support for &apos; entity (missing in HTML_ENTITIES)
    $trans_tbl += array('&apos;' => "'");
    // Replace entities by values
    return strtr ($string, $trans_tbl);
}

// -------------------------------------------------------------------
// Parse() is private method used by Get() to load and parse RSS file.
// Don't use Parse() in your scripts - use Get($rss_file) instead.
// -------------------------------------------------------------------
function Parse ($rss_url) {
    // Open and load RSS file
    if ($f = @fopen($rss_url, 'r')) {
        $rss_content = '';
        while (!feof($f)) {
            $rss_content .= fgets($f, 4096);
        }
        fclose($f);

        // Parse document encoding
        $result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
        // if document codepage is specified, use it
        if ($result['encoding'] != '')
            { $this->rsscp = $result['encoding']; } // This is used in my_preg_match()
        // otherwise use the default codepage
        else
            { $this->rsscp = $this->default_cp; } // This is used in my_preg_match()

        // Parse CHANNEL info
        preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
        foreach($this->channeltags as $channeltag)
        {
            $temp = $this->my_preg_match("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
            if ($temp != '') $result[$channeltag] = $temp; // Set only if not empty
        }
        // If date_format is specified and lastBuildDate is valid
        if ($this->date_format != '' && ($timestamp = strtotime($result['lastBuildDate'])) !==-1) {
                    // convert lastBuildDate to specified date format
                    $result['lastBuildDate'] = date($this->date_format, $timestamp);
        }

        // Parse TEXTINPUT info
        preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
            // This a little strange regexp means:
            // Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
        if (isset($out_textinfo[2])) {
            foreach($this->textinputtags as $textinputtag) {
                $temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
                if ($temp != '') $result['textinput_'.$textinputtag] = $temp; // Set only if not empty
            }
        }
        // Parse IMAGE info
        preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
        if (isset($out_imageinfo[1])) {
            foreach($this->imagetags as $imagetag) {
                $temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
                if ($temp != '') $result['image_'.$imagetag] = $temp; // Set only if not empty
            }
        }
        // Parse ITEMS
        preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
        $rss_items = $items[2];
        $i = 0;
        $result['items'] = array(); // create array even if there are no items
        foreach($rss_items as $rss_item) {
            // If number of items is lower then limit: Parse one item
            if ($i < $this->items_limit || $this->items_limit == 0) {
                foreach($this->itemtags as $itemtag) {
                    $temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
                    if ($temp != '') $result['items'][$i][$itemtag] = $temp; // Set only if not empty
                }
                // Strip HTML tags and other bullshit from DESCRIPTION
                if ($this->stripHTML && $result['items'][$i]['description'])
                    $result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
                // Strip HTML tags and other bullshit from TITLE
                if ($this->stripHTML && $result['items'][$i]['title'])
                    $result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
                // If date_format is specified and pubDate is valid
                if ($this->date_format != '' && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !==-1) {
                    // convert pubDate to specified date format
                    $result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
                }
                // Item counter
                $i++;
            }
        }

        $result['items_count'] = $i;
        return $result;
    }
    else // Error in opening return False
    {
        return False;
    }
}
}

?>