<?php

/**

 * MagpieRSS: a simple RSS integration tool

 *

 * A compiled file for RSS syndication

 *

 * @author Kellan Elliott-McCrea <kellan@protest.net>

 * @version 0.51

 * @license GPL

 *

 * @package External

 * @subpackage MagpieRSS

 */

/*

 * Hook to use another RSS object instead of MagpieRSS

 */

do_action('load_feed_engine');

/** RSS feed constant. */

define('RSS', 'RSS');

define('ATOM', 'Atom');

define('MAGPIE_USER_AGENT', 'WordPress/' . $GLOBALS['wp_version']);

class MagpieRSS {

	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;

	// parser variables

	var $stack				= array(); // parser stack

	var $inchannel			= false;

	var $initem 			= false;

	var $incontent			= false; // if in Atom <content mode="xml"> field

	var $intextinput		= false;

	var $inimage 			= false;

	var $current_field		= '';

	var $current_namespace	= false;

	//var $ERROR = "";

	var $_CONTENT_CONSTRUCTS = array('content', 'summary', 'info', 'title', 'tagline', 'copyright');

	function MagpieRSS ($source) {

		# if PHP xml isn't compiled in, die

		#

		if ( !function_exists('xml_parser_create') )

			trigger_error( "Failed to load PHP's XML Extension. http://www.php.net/manual/en/ref.xml.php" );

		$parser = @xml_parser_create();

		if ( !is_resource($parser) )

			trigger_error( "Failed to create an instance of PHP's XML parser. http://www.php.net/manual/en/ref.xml.php");

		$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

		$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;

				$this->feed_version = $attrs['version'];

				$this->inchannel = true;

			}

			return;

		}

		if ( $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;

		}

		# handle atom content constructs

		elseif ( $this->feed_type == ATOM and in_array($el, $this->_CONTENT_CONSTRUCTS) )

		{

			// avoid clashing w/ RSS mod_content

			if ($el == 'content' ) {

				$el = 'atom_content';

			}

			$this->incontent = $el;

		}

		// if inside an Atom content construct (e.g. content or summary) field treat tags as text

		elseif ($this->feed_type == ATOM and $this->incontent )

		{

			// if tags are inlined, then flatten

			$attrs_str = join(' ',

					array_map(array('MagpieRSS', 'map_attrs'),

					array_keys($attrs),

					array_values($attrs) ) );

			$this->append_content( "<$element $attrs_str>"  );

			array_unshift( $this->stack, $el );

		}

		// Atom support many links per containging element.

		// Magpie treats link elements of type rel='alternate'

		// as being equivalent to RSS's simple link element.

		//

		elseif ($this->feed_type == ATOM and $el == 'link' )

		{

			if ( isset($attrs['rel']) and $attrs['rel'] == 'alternate' )

			{

				$link_el = 'link';

			}

			else {

				$link_el = 'link_' . $attrs['rel'];

			}

			$this->append($link_el, $attrs['href']);

		}

		// set stack[0] to current element

		else {

			array_unshift($this->stack, $el);

		}

	}

	function feed_cdata ($p, $text) {

		if ($this->feed_type == ATOM and $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 ( $el == 'item' or $el == 'entry' )

		{

			$this->items[] = $this->current_item;

			$this->current_item = array();

			$this->initem = false;

		}

		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 ($this->feed_type == ATOM and in_array($el, $this->_CONTENT_CONSTRUCTS) )

		{

			$this->incontent = false;

		}

		elseif ($el == 'channel' or $el == 'feed' )

		{

			$this->inchannel = false;

		}

		elseif ($this->feed_type == ATOM and $this->incontent  ) {

			// balance tags properly

			// note:  i don't think this is actually neccessary

			if ( $this->stack[0] == $el )

			{

				$this->append_content("</$el>");

			}

			else {

				$this->append_content("<$el />");

			}

			array_shift( $this->stack );

		}

		else {

			array_shift( $this->stack );

		}

		$this->current_namespace = false;

	}

	function concat (&$str1, $str2="") {

		if (!isset($str1) ) {

			$str1="";

		}

		$str1 .= $str2;

	}

	function append_content($text) {

		if ( $this->initem ) {

			$this->concat( $this->current_item[ $this->incontent ], $text );

		}

		elseif ( $this->inchannel ) {

			$this->concat( $this->channel[ $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 );

			}

		}

	}

	function normalize () {

		// if atom populate rss fields

		if ( $this->is_atom() ) {

			$this->channel['descripton'] = $this->channel['tagline'];

			for ( $i = 0; $i < count($this->items); $i++) {

				$item = $this->items[$i];

				if ( isset($item['summary']) )

					$item['description'] = $item['summary'];

				if ( isset($item['atom_content']))

					$item['content']['encoded'] = $item['atom_content'];

				$this->items[$i] = $item;

			}

		}

		elseif ( $this->is_rss() ) {

			$this->channel['tagline'] = $this->channel['description'];

			for ( $i = 0; $i < count($this->items); $i++) {

				$item = $this->items[$i];

				if ( isset($item['description']))

					$item['summary'] = $item['description'];

				if ( isset($item['content']['encoded'] ) )

					$item['atom_content'] = $item['content']['encoded'];

				$this->items[$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;

		}

	}

	function map_attrs($k, $v) {

		return "$k=\"$v\"";

	}

	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);

		}

	}

}

if ( !function_exists('fetch_rss') ) :

/**

 * Build Magpie object based on RSS from URL.

 *

 * @since unknown

 * @package External

 * @subpackage MagpieRSS