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<?php

/*

 ======================================================================

 lastRSS 0.6

 Simple yet powerful PHP class to parse RSS files.

 by Vojtech Semecky, webmaster@webdot.cz

 Latest version, features, manual and examples:

     http://lastrss.webdot.cz/

 ----------------------------------------------------------------------

 TODO

 - Iconv nedavat na cely, ale jen na TITLE a DESCRIPTION (u item i celkove)

 ----------------------------------------------------------------------

 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

 ======================================================================

*/

class lastRSS {

    // -------------------------------------------------------------------

    // Settings

    // -------------------------------------------------------------------

    var $channeltags = array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'pubDate', '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');

    var $strip_html = true;

    var $time_out = 5;

    var $user_agent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; rv:1.7.3) Gecko/20040913 Firefox/0.10";

    // -------------------------------------------------------------------

    // 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 trimmed field with index 1

    // from 'classic' preg_match() array output

    // -------------------------------------------------------------------

    function my_preg_match ($pattern, $subject) {

        preg_match($pattern, $subject, $out);

        return trim($out[1]);

    }

    // -------------------------------------------------------------------

    // Replace HTML entities &something; by real characters

    // -------------------------------------------------------------------

    function unhtmlentities ($string) {

        $trans_tbl = get_html_translation_table (HTML_ENTITIES);

        $trans_tbl = array_flip ($trans_tbl);

        return strtr ($string, $trans_tbl);

    }

    // -------------------------------------------------------------------

    // Encoding conversion function

    // -------------------------------------------------------------------

    function MyConvertEncoding($in_charset, $out_charset, $string) {

        // if substitute_character

        if ($this->subs_char) {

            // Iconv() to UTF-8. mb_convert_encoding() to $out_charset

            $utf = iconv($in_charset, 'UTF-8', $string);

            mb_substitute_character($this->subs_char);

            return mb_convert_encoding ($utf, $out_charset, 'UTF-8');

        } else {

            // Iconv() to $out_charset

            return iconv($in_charset, $out_charset, $string);

        }

    }

    // -------------------------------------------------------------------

    // 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) {

        include_once( "db.php" );

        include_once( "functions.php" );

        // Open and load RSS file

        $rss_content = fetchHTML( $rss_url );

        if( empty( $rss_content ) )

        {

            return false;

        }

        // Parse document encoding

        $result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);

        // If code page is set convert character encoding to required

            if ($this->cp != '')

                $rss_content = $this->MyConvertEncoding($result['encoding'], $this->cp, $rss_content);

        // 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

        }

        // 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 beginning tag)

        if ($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 ($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];

        $result['items_count'] = count($items[1]);

        $i = 0;

        $result['items'] = array(); // create array even if there are no items

        foreach($rss_items as $rss_item) {

            // Parse one item

            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 description is presented)

            if ($result['items'][$i]['description'] && $this->strip_html == true)

            {

                $result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));

            }

            // Item counter

            $i++;

        }

        return $result;

    }

}

?>