<?php
/* Project:	MagpieRSS: a simple RSS integration tool
 * @author:	Kellan Elliot-McCrea <kellan@protest.net>
 *		WordPress development team <http://www.wordpress.org/>
 *		Charles Johnson <technophilia@radgeek.com>
 * @version:	0.8wp (2005.10.14)
 * @license:	GPL
 */

define('RSS', 'RSS');
define('ATOM', 'Atom');

require_once (AB_MAGPIE_DIR . 'rss_utils.inc');

/**
* Hybrid parser, and object, takes RSS as a string and returns a simple object.
*
* see: rss_fetch.inc for a simpler interface with integrated caching support
*
*/
class MagpieAutoBlogRSS {
    var $parser;
    
    var $current_item   = array();  // item currently being parsed
    var $items          = array();  // collection of parsed items
    var $channel        = array();  // hash of channel fields
    var $textinput      = array();
    var $image          = array();
    var $feed_type;
    var $feed_version;
    var $encoding       = '';       // output encoding of parsed rss
    
    var $_source_encoding = '';     // only set if we have to parse xml prolog
    
    var $ERROR = "";
    var $WARNING = "";
    
    // define some constants
    
    var $_ATOM_CONTENT_CONSTRUCTS = array(
    	'content', 'summary', 'title', /* common */
	'info', 'tagline', 'copyright', /* Atom 0.3 */
    	'rights', 'subtitle', /* Atom 1.0 */
	);
    var $_XHTML_CONTENT_CONSTRUCTS = array('body', 'div');
    var $_KNOWN_ENCODINGS    = array('UTF-8', 'US-ASCII', 'ISO-8859-1');

    // parser variables, useless if you're not a parser, treat as private
    var $stack              = array(); // parser stack
    var $inchannel          = false;
    var $initem             = false;
    
    var $incontent          = array(); // non-empty if in namespaced XML content field
    var $exclude_top	    = false; // true when Atom 1.0 type="xhtml"

    var $intextinput        = false;
    var $inimage            = false;
    var $current_namespace  = false;
    
    /**
     *  Set up XML parser, parse source, and return populated RSS object..
     *   
     *  @param string $source           string containing the RSS to be parsed
     *
     *  NOTE:  Probably a good idea to leave the encoding options alone unless
     *         you know what you're doing as PHP's character set support is
     *         a little weird.
     *
     *  NOTE:  A lot of this is unnecessary but harmless with PHP5 
     *
     *
     *  @param string $output_encoding  output the parsed RSS in this character 
     *                                  set defaults to ISO-8859-1 as this is PHP's
     *                                  default.
     *
     *                                  NOTE: might be changed to UTF-8 in future
     *                                  versions.
     *                               
     *  @param string $input_encoding   the character set of the incoming RSS source. 
     *                                  Leave blank and Magpie will try to figure it
     *                                  out.
     *                                  
     *                                   
     *  @param bool   $detect_encoding  if false Magpie won't attempt to detect
     *                                  source encoding. (caveat emptor)
     *
     */
    function MagpieAutoBlogRSS ($source, $output_encoding='ISO-8859-1', 
                        $input_encoding=null, $detect_encoding=true) 
    {   
        # if PHP xml isn't compiled in, die
        #
        if (!function_exists('xml_parser_create')) {
            $this->error( "Failed to load PHP's XML Extension. " . 
                          "http://www.php.net/manual/en/ref.xml.php",
                           E_USER_ERROR );
        }
        
        list($parser, $source) = $this->create_parser($source, 
                $output_encoding, $input_encoding, $detect_encoding);
        
        
        if (!is_resource($parser)) {
            $this->error( "Failed to create an instance of PHP's XML parser. " .
                          "http://www.php.net/manual/en/ref.xml.php",
                          E_USER_ERROR );
        }

        
        $this->parser = $parser;
        
        # pass in parser, and a reference to this object
        # setup handlers
        #
        xml_set_object( $this->parser, $this );
        xml_set_element_handler($this->parser, 
                'feed_start_element', 'feed_end_element' );
                        
        xml_set_character_data_handler( $this->parser, 'feed_cdata' ); 
	
        $status = xml_parse( $this->parser, $source );
        
        if (! $status ) {
            $errorcode = xml_get_error_code( $this->parser );
            if ( $errorcode != XML_ERROR_NONE ) {
                $xml_error = xml_error_string( $errorcode );
                $error_line = xml_get_current_line_number($this->parser);
                $error_col = xml_get_current_column_number($this->parser);
                $errormsg = "$xml_error at line $error_line, column $error_col";

                $this->error( $errormsg );
            }
        }
        
        xml_parser_free( $this->parser );

        $this->normalize();
    }
    
    function feed_start_element($p, $element, &$attrs) {
        $el = $element = strtolower($element);
        $attrs = array_change_key_case($attrs, CASE_LOWER);
        
        // check for a namespace, and split if found
        if ( empty($this->incontent) ) { // Don't munge content tags
		$ns = false;
		if ( strpos( $element, ':' ) ) {
		    list($ns, $el) = split( ':', $element, 2); 
		}
		if ( $ns and $ns != 'rdf' ) {
		    $this->current_namespace = $ns;
		}
	}

        # if feed type isn't set, then this is first element of feed
        # identify feed from root element
        #
        if (!isset($this->feed_type) ) {
            if ( $el == 'rdf' ) {
                $this->feed_type = RSS;
                $this->feed_version = '1.0';
            }
            elseif ( $el == 'rss' ) {
                $this->feed_type = RSS;
                $this->feed_version = $attrs['version'];
            }
            elseif ( $el == 'feed' ) {
                $this->feed_type = ATOM;
		if ($attrs['xmlns'] == 'http://www.w3.org/2005/Atom') { // Atom 1.0
			$this->feed_version = '1.0';
		}
		else { // Atom 0.3, probably.
			$this->feed_version = $attrs['version'];
		}
                $this->inchannel = true;
            }
            return;
        }
    
        // if we're inside a namespaced content construct, treat tags as text
        if ( !empty($this->incontent) ) 
        {
		if ((count($this->incontent) > 1) or !$this->exclude_top) {
			// if tags are inlined, then flatten
			$attrs_str = join(' ', 
				array_map('nba_map_attrs', 
				array_keys($attrs), 
				array_values($attrs) ) );
				if (strlen($attrs_str) > 0) $attrs_str = ' '.$attrs_str;
	    
				$this->append_content( "<{$element}{$attrs_str}>"  );
		}
		array_push($this->incontent, $el); // stack for parsing content XML
        }
	
	elseif ( $el == 'channel' ) 
        {
            $this->inchannel = true;
        }
	
        elseif ($el == 'item' or $el == 'entry' ) 
        {
            $this->initem = true;
            if ( isset($attrs['rdf:about']) ) {
                $this->current_item['about'] = $attrs['rdf:about']; 
            }
        }

        // if we're in the default namespace of an RSS feed,
        //  record textinput or image fields
        elseif ( 
            $this->feed_type == RSS and 
            $this->current_namespace == '' and 
            $el == 'textinput' ) 
        {
            $this->intextinput = true;
        }
        
        elseif (
            $this->feed_type == RSS and 
            $this->current_namespace == '' and 
            $el == 'image' ) 
        {
            $this->inimage = true;
        }
        
        // set stack[0] to current element
        else {
		// Atom support many links per containing element.
		// Magpie treats link elements of type rel='alternate'
		// as being equivalent to RSS's simple link element.

		$atom_link = false;
		if ($this->feed_type == ATOM and $el == 'link') {
			$atom_link = true;
			if (isset($attrs['rel']) and $attrs['rel'] != 'alternate') {
				$el = $el . "_" . $attrs['rel'];  // pseudo-element names for Atom link elements
			}
		}
		# handle atom content constructs
		elseif ( $this->feed_type == ATOM and in_array($el, $this->_ATOM_CONTENT_CONSTRUCTS) )
		{
			// avoid clashing w/ RSS mod_content
			if ($el == 'content' ) {
				$el = 'atom_content';
			}

			// assume that everything accepts namespaced XML
			// (that will pass through some non-validating feeds;
			// but so what? this isn't a validating parser)
			$this->incontent = array();
			array_push($this->incontent, $el); // start a stack

			if (
				isset($attrs['type'])
				and trim(strtolower($attrs['type']))=='xhtml'
			) {
				$this->exclude_top = true;
			} else {
				$this->exclude_top = false;
			}
		}
		# Handle inline XHTML body elements --CWJ
		elseif (
			($this->current_namespace=='xhtml' or (isset($attrs['xmlns']) and $attrs['xmlns'] == 'http://www.w3.org/1999/xhtml'))
			and in_array($el, $this->_XHTML_CONTENT_CONSTRUCTS) )
		{
			$this->current_namespace = 'xhtml';
			$this->incontent = array();
			array_push($this->incontent, $el); // start a stack
			$this->exclude_top = false;
		}

		array_unshift($this->stack, $el);
		$elpath = join('_', array_reverse($this->stack));
		
		$n = $this->element_count($elpath);
		$this->element_count($elpath, $n+1);
		
		if ($n > 0) {
		    array_shift($this->stack);
		    array_unshift($this->stack, $el.'#'.($n+1));
		    $elpath = join('_', array_reverse($this->stack));
		}

		// this makes the baby Jesus cry, but we can't do it in normalize()
		// because we've made the element name for Atom links unpredictable
		// by tacking on the relation to the end. -CWJ
		if ($atom_link and isset($attrs['href'])) {
			$this->append($elpath, $attrs['href']);
		}
		
		// add attributes
		if (count($attrs) > 0) {
			$this->append($elpath.'@', join(',', array_keys($attrs)));
			foreach ($attrs as $attr => $value) {
				$this->append($elpath.'@'.$attr, $value);
			}
		}
        }
    }
    

    
    function feed_cdata ($p, $text) {
        
        if ($this->incontent) {
            $this->append_content( $text );
        }
        else {
            $current_el = join('_', array_reverse($this->stack));
            $this->append($current_el, $text);
        }
    }
    
    function feed_end_element ($p, $el) {
        $el = strtolower($el);

        if ( $this->incontent ) {
		$opener = array_pop($this->incontent);

		// Don't get bamboozled by namespace voodoo
		if (strpos($el, ':')) { list($ns, $closer) = split(':', $el); }
		else { $ns = false; $closer = $el; }

		// Don't get bamboozled by our munging of <atom:content>, either
		if ($this->feed_type == ATOM and $closer == 'content') {
			$closer = 'atom_content';
		}

		// balance tags properly
		// note:  i don't think this is actually neccessary
		if ($opener != $closer) {
			array_push($this->incontent, $opener);
			$this->append_content("<$el />");
		} elseif ($this->incontent) { // are we in the content construct still?
			if ((count($this->incontent) > 1) or !$this->exclude_top) {
				$this->append_content("</$el>");
			}
		} else { // shift the opening of the content construct off the normal stack
			array_shift( $this->stack );
		}
        }
        elseif ( $el == 'item' or $el == 'entry' ) 
        {
            $this->items[] = $this->current_item;
            $this->current_item = array();
            $this->initem = false;

	    $this->current_category = 0;
        }
       elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'textinput' ) 
        {
            $this->intextinput = false;
        }
        elseif ($this->feed_type == RSS and $this->current_namespace == '' and $el == 'image' ) 
        {
            $this->inimage = false;
        }
        elseif ($el == 'channel' or $el == 'feed' ) 
        {
            $this->inchannel = false;
        }
        else {
		array_shift( $this->stack );
        }
        
	if ( !$this->incontent ) { // Don't munge the namespace after finishing with elements in namespaced content constructs -CWJ
		$this->current_namespace = false;
	}
    }
    
    function concat (&$str1, $str2="") {
        if (!isset($str1) ) {
            $str1="";
        }
        $str1 .= $str2;
    }
    
    function append_content($text) {
	if ( $this->initem ) {
		if ($this->current_namespace) {
			$this->concat( $this->current_item[$this->current_namespace][ reset($this->incontent) ], $text );
		} else {
			$this->concat( $this->current_item[ reset($this->incontent) ], $text );
		}
	}
	elseif ( $this->inchannel ) {
		if ($this->current_namespace) {
			$this->concat( $this->channel[$this->current_namespace][ reset($this->incontent) ], $text );
		} else {
			$this->concat( $this->channel[ reset($this->incontent) ], $text );
		}
	}
    }
    
    // smart append - field and namespace aware
    function append($el, $text) {
        if (!$el) {
            return;
        }
        if ( $this->current_namespace ) 
        {
            if ( $this->initem ) {
		    $this->concat(
		    	$this->current_item[ $this->current_namespace ][ $el ], $text);
            }
            elseif ($this->inchannel) {
		$this->concat(
		    $this->channel[ $this->current_namespace][ $el ], $text );
	    }
            elseif ($this->intextinput) {
                $this->concat(
                    $this->textinput[ $this->current_namespace][ $el ], $text );
            }
            elseif ($this->inimage) {
                $this->concat(
                    $this->image[ $this->current_namespace ][ $el ], $text );
            }
        }
        else {
            if ( $this->initem ) {
		$this->concat(
		    $this->current_item[ $el ], $text);
            }
            elseif ($this->intextinput) {
                $this->concat(
                    $this->textinput[ $el ], $text );
            }
            elseif ($this->inimage) {
                $this->concat(
                    $this->image[ $el ], $text );
            }
            elseif ($this->inchannel) {
		$this->concat(
		    $this->channel[ $el ], $text );
            }
            
        }
    }

    // smart count - field and namespace aware
    function element_count ($el, $set = NULL) {
        if (!$el) {
            return;
        }
        if ( $this->current_namespace ) 
        {
            if ( $this->initem ) {
		    if (!is_null($set)) { $this->current_item[ $this->current_namespace ][ $el.'#' ] = $set; }
		    $ret = (isset($this->current_item[ $this->current_namespace ][ $el.'#' ]) ?
		    $this->current_item[ $this->current_namespace ][ $el.'#' ] : 0);
            }
            elseif ($this->inchannel) {
		    if (!is_null($set)) { $this->channel[ $this->current_namespace ][ $el.'#' ] = $set; }
		    $ret = (isset($this->channel[ $this->current_namespace][ $el.'#' ]) ?
		    $this->channel[ $this->current_namespace][ $el.'#' ] : 0);
	    }
        }
        else {
            if ( $this->initem ) {
		    if (!is_null($set)) { $this->current_item[ $el.'#' ] = $set; }
		    $ret = (isset($this->current_item[ $el.'#' ]) ?
		    $this->current_item[ $el.'#' ] : 0);
            }
            elseif ($this->inchannel) {
		    if (!is_null($set)) {$this->channel[ $el.'#' ] = $set; }
		    $ret = (isset($this->channel[ $el.'#' ]) ?
		    $this->channel[ $el.'#' ] : 0);
	    }
        }
	return $ret;
    }

    function normalize_enclosure (&$source, $from, &$dest, $to, $i) {
	    $id_from = $this->element_id($from, $i);
	    $id_to = $this->element_id($to, $i);
	    if (isset($source["{$id_from}@"])) {
		    foreach (explode(',', $source["{$id_from}@"]) as $attr) {
			    if ($from=='link_enclosure' and $attr=='href') { // from Atom
				    $dest["{$id_to}@url"] = $source["{$id_from}@{$attr}"];
				    $dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
			    }
			    elseif ($from=='enclosure' and $attr=='url') { // from RSS
				    $dest["{$id_to}@href"] = $source["{$id_from}@{$attr}"];
				    $dest["{$id_to}"] = $source["{$id_from}@{$attr}"];
			    }
			    else {
				    $dest["{$id_to}@{$attr}"] = $source["{$id_from}@{$attr}"];
			    }
		    }
	    }
    }

    function normalize_atom_person (&$source, $person, &$dest, $to, $i) {
	    $id = $this->element_id($person, $i);
	    $id_to = $this->element_id($to, $i);

    	    // Atom 0.3 <=> Atom 1.0
	    if ($this->feed_version >= 1.0) { $used = 'uri'; $norm = 'url'; }
	    else { $used = 'url'; $norm = 'uri'; }

	    if (isset($source["{$id}_{$used}"])) {
		    $dest["{$id_to}_{$norm}"] = $source["{$id}_{$used}"];
	    }

	    // Atom to RSS 2.0 and Dublin Core
	    // RSS 2.0 person strings should be valid e-mail addresses if possible.
	    if (isset($source["{$id}_email"])) {
		    $rss_author = $source["{$id}_email"];
	    }
	    if (isset($source["{$id}_name"])) {
		    $rss_author = $source["{$id}_name"]
		    	. (isset($rss_author) ? " <$rss_author>" : '');
	    }
	    if (isset($rss_author)) {
	    	$source[$id] = $rss_author; // goes to top-level author or contributor
		$dest[$id_to] = $rss_author; // goes to dc:creator or dc:contributor
	    }
    }

    // Normalize Atom 1.0 and RSS 2.0 categories to Dublin Core...
    function normalize_category (&$source, $from, &$dest, $to, $i) {
	    $cat_id = $this->element_id($from, $i);
	    $dc_id = $this->element_id($to, $i);

	    // first normalize category elements: Atom 1.0 <=> RSS 2.0
	    if ( isset($source["{$cat_id}@term"]) ) { // category identifier
		    $source[$cat_id] = $source["{$cat_id}@term"];
	    } elseif ( $this->feed_type == RSS ) {
		    $source["{$cat_id}@term"] = $source[$cat_id];
	    }
	    
	    if ( isset($source["{$cat_id}@scheme"]) ) { // URI to taxonomy
		    $source["{$cat_id}@domain"] = $source["{$cat_id}@scheme"];
	    } elseif ( isset($source["{$cat_id}@domain"]) ) {
		    $source["{$cat_id}@scheme"] = $source["{$cat_id}@domain"];
	    }

	    // Now put the identifier into dc:subject
	    $dest[$dc_id] = $source[$cat_id];
    }
    
    // ... or vice versa
    function normalize_dc_subject (&$source, $from, &$dest, $to, $i) {
	    $dc_id = $this->element_id($from, $i);
	    $cat_id = $this->element_id($to, $i);

	    $dest[$cat_id] = $source[$dc_id];		// RSS 2.0
	    $dest["{$cat_id}@term"] = $source[$dc_id]; 	// Atom 1.0
    }

    // simplify the logic for normalize(). Makes sure that count of elements and
    // each of multiple elements is normalized properly. If you need to mess
    // with things like attributes or change formats or the like, pass it a
    // callback to handle each element.
    function normalize_element (&$source, $from, &$dest, $to, $via = NULL) {
	    if (isset($source[$from]) or isset($source["{$from}#"])) {
		    if (isset($source["{$from}#"])) {
		    	$n = $source["{$from}#"];
		    	$dest["{$to}#"] = $source["{$from}#"];
		    }
		    else { $n = 1; }

		    for ($i = 1; $i <= $n; $i++) {
			    if (isset($via)) { // custom callback for ninja attacks
				    $this->{$via}($source, $from, $dest, $to, $i);
			    }
			    else { // just make it the same
				    $from_id = $this->element_id($from, $i);
				    $to_id = $this->element_id($to, $i);
				    $dest[$to_id] = $source[$from_id];
			    }
		    }
	    }
    }

    function normalize () {
        // if atom populate rss fields and normalize 0.3 and 1.0 feeds
        if ( $this->is_atom() ) {
		// Atom 1.0 elements <=> Atom 0.3 elements (Thanks, o brilliant wordsmiths of the Atom 1.0 standard!)
		if ($this->feed_version < 1.0) {
			$this->normalize_element($this->channel, 'tagline', $this->channel, 'subtitle');
			$this->normalize_element($this->channel, 'copyright', $this->channel, 'rights');
			$this->normalize_element($this->channel, 'modified', $this->channel, 'updated');
		} else {
			$this->normalize_element($this->channel, 'subtitle', $this->channel, 'tagline');
			$this->normalize_element($this->channel, 'rights', $this->channel, 'copyright');
			$this->normalize_element($this->channel, 'updated', $this->channel, 'modified');
		}
		$this->normalize_element($this->channel, 'author', $this->channel['dc'], 'creator', 'normalize_atom_person');
		$this->normalize_element($this->channel, 'contributor', $this->channel['dc'], 'contributor', 'normalize_atom_person');

		// Atom elements to RSS elements
		$this->normalize_element($this->channel, 'subtitle', $this->channel, 'description');
		
		if ( isset($this->channel['logo']) ) {
			$this->normalize_element($this->channel, 'logo', $this->image, 'url');
			$this->normalize_element($this->channel, 'link', $this->image, 'link');
			$this->normalize_element($this->channel, 'title', $this->image, 'title');
		}

		for ( $i = 0; $i < count($this->items); $i++) {
			$item = $this->items[$i];

			// Atom 1.0 elements <=> Atom 0.3 elements
			if ($this->feed_version < 1.0) {
				$this->normalize_element($item, 'modified', $item, 'updated');
				$this->normalize_element($item, 'issued', $item, 'published');
			} else {
				$this->normalize_element($item, 'updated', $item, 'modified');
				$this->normalize_element($item, 'published', $item, 'issued');
			}

			// "If an atom:entry element does not contain
			// atom:author elements, then the atom:author elements
			// of the contained atom:source element are considered
			// to apply. In an Atom Feed Document, the atom:author
			// elements of the containing atom:feed element are
			// considered to apply to the entry if there are no
			// atom:author elements in the locations described
			// above." <http://atompub.org/2005/08/17/draft-ietf-atompub-format-11.html#rfc.section.4.2.1>
			if (!isset($item["author#"])) {
				if (isset($item["source_author#"])) { // from aggregation source
					$source = $item;
					$author = "source_author";
				} elseif (isset($this->channel["author#"])) { // from containing feed
					$source = $this->channel;
					$author = "author";
				}

				$item["author#"] = $source["{$author}#"];
				for ($au = 1; $au <= $item["author#"]; $au++) {
					$id_to = $this->element_id('author', $au);
					$id_from = $this->element_id($author, $au);
					
					$item[$id_to] = $source[$id_from];
					foreach (array('name', 'email', 'uri', 'url') as $what) {
						if (isset($source["{$id_from}_{$what}"])) {
							$item["{$id_to}_{$what}"] = $source["{$id_from}_{$what}"];
						}
					}
				}
			}

			// Atom elements to RSS elements
			$this->normalize_element($item, 'author', $item['dc'], 'creator', 'normalize_atom_person');
			$this->normalize_element($item, 'contributor', $item['dc'], 'contributor', 'normalize_atom_person');
			$this->normalize_element($item, 'summary', $item, 'description');
			$this->normalize_element($item, 'atom_content', $item['content'], 'encoded');
			$this->normalize_element($item, 'link_enclosure', $item, 'enclosure', 'normalize_enclosure');

			// Categories
			if ( isset($item['category#']) ) { // Atom 1.0 categories to dc:subject and RSS 2.0 categories
				$this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
			}
			elseif ( isset($item['dc']['subject#']) ) { // dc:subject to Atom 1.0 and RSS 2.0 categories
				$this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
			}

			// Normalized item timestamp
			$atom_date = (isset($item['published']) ) ? $item['published'] : $item['updated'];
			if ( $atom_date ) {
				$epoch = @nba_parse_w3cdtf($atom_date);
				if ($epoch and $epoch > 0) {
					$item['date_timestamp'] = $epoch;
				}
			}

			$this->items[$i] = $item;
		}
        }
        elseif ( $this->is_rss() ) {
		// RSS elements to Atom elements
		$this->normalize_element($this->channel, 'description', $this->channel, 'tagline'); // Atom 0.3
		$this->normalize_element($this->channel, 'description', $this->channel, 'subtitle'); // Atom 1.0 (yay wordsmithing!)
		$this->normalize_element($this->image, 'url', $this->channel, 'logo');

            for ( $i = 0; $i < count($this->items); $i++) {
                $item = $this->items[$i];
		
		// RSS elements to Atom elements
		$this->normalize_element($item, 'description', $item, 'summary');
                $this->normalize_element($item['content'], 'encoded', $item, 'atom_content');
		$this->normalize_element($item, 'enclosure', $item, 'link_enclosure', 'normalize_enclosure');

		// Categories
		if ( isset($item['category#']) ) { // RSS 2.0 categories to dc:subject and Atom 1.0 categories
			$this->normalize_element($item, 'category', $item['dc'], 'subject', 'normalize_category');
		}
		elseif ( isset($item['dc']['subject#']) ) { // dc:subject to Atom 1.0 and RSS 2.0 categories
			$this->normalize_element($item['dc'], 'subject', $item, 'category', 'normalize_dc_subject');
		}

		// Normalized item timestamp
                if ( $this->is_rss() == '1.0' and isset($item['dc']['date']) ) {
                    $epoch = @nba_parse_w3cdtf($item['dc']['date']);
                    if ($epoch and $epoch > 0) {
                        $item['date_timestamp'] = $epoch;
                    }
                }
                elseif ( isset($item['pubdate']) ) {
                    $epoch = @strtotime($item['pubdate']);
                    if ($epoch > 0) {
                        $item['date_timestamp'] = $epoch;
                    }
                }

                $this->items[$i] = $item;
            }
        }
    }
    
    
    function is_rss () {
        if ( $this->feed_type == RSS ) {
            return $this->feed_version; 
        }
        else {
            return false;
        }
    }
    
    function is_atom() {
        if ( $this->feed_type == ATOM ) {
            return $this->feed_version;
        }
        else {
            return false;
        }
    }

    /**
    * return XML parser, and possibly re-encoded source
    *
    */
    function create_parser($source, $out_enc, $in_enc, $detect) {
        if ( substr(phpversion(),0,1) == 5) {
            $parser = $this->php5_create_parser($in_enc, $detect);
        }
        else {
            list($parser, $source) = $this->php4_create_parser($source, $in_enc, $detect);
        }
        if ($out_enc) {
            $this->encoding = $out_enc;
            xml_parser_set_option($parser, XML_OPTION_TARGET_ENCODING, $out_enc);
        }
        
        return array($parser, $source);
    }
    
    /**
    * Instantiate an XML parser under PHP5
    *
    * PHP5 will do a fine job of detecting input encoding
    * if passed an empty string as the encoding. 
    *
    * All hail libxml2!
    *
    */
    function php5_create_parser($in_enc, $detect) {
        // by default php5 does a fine job of detecting input encodings
        if(!$detect && $in_enc) {
            return xml_parser_create($in_enc);
        }
        else {
            return xml_parser_create('');
        }
    }
    
    /**
    * Instaniate an XML parser under PHP4
    *
    * Unfortunately PHP4's support for character encodings
    * and especially XML and character encodings sucks.  As
    * long as the documents you parse only contain characters
    * from the ISO-8859-1 character set (a superset of ASCII,
    * and a subset of UTF-8) you're fine.  However once you
    * step out of that comfy little world things get mad, bad,
    * and dangerous to know.
    *
    * The following code is based on SJM's work with FoF
    * @see http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss
    *
    */
    function php4_create_parser($source, $in_enc, $detect) {
        if ( !$detect ) {
            return array(xml_parser_create($in_enc), $source);
        }
        
        if (!$in_enc) {
            if (preg_match('/<?xml.*encoding=[\'"](.*?)[\'"].*?>/m', $source, $m)) {
                $in_enc = strtoupper($m[1]);
                $this->source_encoding = $in_enc;
            }
            else {
                $in_enc = 'UTF-8';
            }
        }
        
        if ($this->known_encoding($in_enc)) {
            return array(xml_parser_create($in_enc), $source);
        }
        
        // the dectected encoding is not one of the simple encodings PHP knows
        
        // attempt to use the iconv extension to
        // cast the XML to a known encoding
        // @see http://php.net/iconv
       
        if (function_exists('iconv'))  {
            $encoded_source = iconv($in_enc,'UTF-8', $source);
            if ($encoded_source) {
                return array(xml_parser_create('UTF-8'), $encoded_source);
            }
        }
        
        // iconv didn't work, try mb_convert_encoding
        // @see http://php.net/mbstring
        if(function_exists('mb_convert_encoding')) {
            $encoded_source = mb_convert_encoding($source, 'UTF-8', $in_enc );
            if ($encoded_source) {
                return array(xml_parser_create('UTF-8'), $encoded_source);
            }
        }
        
        // else 
        $this->error("Feed is in an unsupported character encoding. ($in_enc) " .
                     "You may see strange artifacts, and mangled characters.",
                     E_USER_NOTICE);
            
        return array(xml_parser_create(), $source);
    }
    
    function known_encoding($enc) {
        $enc = strtoupper($enc);
        if ( in_array($enc, $this->_KNOWN_ENCODINGS) ) {
            return $enc;
        }
        else {
            return false;
        }
    }

    function error ($errormsg, $lvl=E_USER_WARNING) {
        // append PHP's error message if track_errors enabled
        if ( isset($php_errormsg) ) { 
            $errormsg .= " ($php_errormsg)";
        }
        if ( MAGPIE_DEBUG ) {
            trigger_error( $errormsg, $lvl);        
        }
        else {
            error_log( $errormsg, 0);
        }
        
        $notices = E_USER_NOTICE|E_NOTICE;
        if ( $lvl&$notices ) {
            $this->WARNING = $errormsg;
        } else {
            $this->ERROR = $errormsg;
        }
    }

    // magic ID function for multiple elemenets.
    // can be called as static MagpieRSS::element_id()
    function element_id ($el, $counter) {
	    return $el . (($counter > 1) ? '#'.$counter : '');
    }
} // end class RSS

function nba_map_attrs($k, $v) {
    return "$k=\"$v\"";
}

// patch to support medieval versions of PHP4.1.x, 
// courtesy, Ryan Currie, ryan@digibliss.com

if (!function_exists('array_change_key_case')) {
	define("CASE_UPPER",1);
	define("CASE_LOWER",0);


	function array_change_key_case($array,$case=CASE_LOWER) {
       if ($case==CASE_LOWER) $cmd='strtolower';
       elseif ($case==CASE_UPPER) $cmd='strtoupper';
       foreach($array as $key=>$value) {
               $output[$cmd($key)]=$value;
       }
       return $output;
	}

}