Viewing file:  SaxRssParser.php (4.33 KB) -rw-rw-rw-
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<?php
/**
* @package SPLIB
* @version $Id: SaxRssParser.php,v 1.1 2003/12/12 08:06:02 kevin Exp $
*/
/**
* SaxRssParser Class
* Parses an RSS feed with SAX
* @access public
* @package SPLIB
*/
class SaxRssParser {
/**
* Instance of the PHP SAX XML parser
* @access private
* @var resource
*/
var $sax;
/**
* The marker for <item /> tags
* @access private
* @var boolean
*/
var $newItem;
/**
* Stores the name of the current element either
* title, description or link
* @access private
* @var string
*/
var $element;
/**
* Stores the contents of <title />
* @access private
* @var string
*/
var $title;
/**
* Stores the contents of <description />
* @access private
* @var string
*/
var $description;
/**
* Stores the contents of <link />
* @access private
* @var string
*/
var $link;
/**
* An array of items stored as stdClass objects
* @access private
* @var array
*/
var $items;
/**
* SaxRssParser constructor
* @access public
*/
function SaxRssParser () {
$this->newItem=false;
$this->element='';
$this->title='';
$this->description='';
$this->link='';
$this->items=array();
$this->sax = xml_parser_create();
xml_set_object($this->sax,$this);
xml_set_element_handler($this->sax, 'open', 'close');
xml_set_character_data_handler($this->sax, 'data');
}
/**
* Parses a chunk of XML document
* @param string a chunk of XML
* @return boolean
* @access public
*/
function parse($data) {
if ( !xml_parse($this->sax, $data) ) {
$error=xml_error_string (xml_get_error_code ($this->sax));
$line=xml_get_current_line_number($this->sax);
trigger_error ('XML error '.$error.' at line '.$line);
return false;
} else {
return true;
}
}
/**
* Destroys the parser
* @return void
* @access public
*/
function destroy() {
xml_parser_free($this->sax);
}
/**
* Iterator for RSS Items, returning prepared items as stdClasses
* Returns an instance of stdClass containing the parameters
* title, description and link or false if at end of collection
* @return mixed
* @access public
*/
function fetch () {
$item=each ( $this->items );
if ( $item ) {
return $item['value'];
} else {
reset ( $this->items );
return false;
}
}
/**
* Handles opening tags
* @param resource instance of PHP SAX XML
* @param string element name
* @param array element attributes
* @return void
* @access private
*/
function open ($sax, $element, $attributes) {
if ($this->newItem)
$this->element = $element;
else if ($element == 'ITEM')
$this->newItem = true;
}
/**
* Handles closing tags
* @param resource instance of PHP SAX XML
* @param string element name
* @return void
* @access private
*/
function close($sax, $element) {
if ($element == 'ITEM') {
$item=new stdClass;
$item->title=$this->title;
$item->link=$this->link;
$item->description=$this->description;
$this->items[] = $item;
$this->title = '';
$this->description = '';
$this->link = '';
$this->newItem = false;
}
}
/**
* Handles character data
* @param resource instance of PHP SAX XML
* @param string element name
* @return void
* @access private
*/
function data($sax, $data) {
if ($this->newItem) {
switch ($this->element) {
case 'TITLE':
$this->title .= $data;
break;
case 'DESCRIPTION':
$this->description .= $data;
break;
case 'LINK':
$this->link .= $data;
break;
}
}
}
}
?>
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