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<?php rcs_id('$Id: RssWriter.php,v 1.12 2005/07/24 09:52:59 rurban Exp $');
/*
* Code for creating RSS 1.0.
*/
// Encoding for RSS output.
if (!defined('RSS_ENCODING'))
define('RSS_ENCODING', $GLOBALS['charset']);
/**
* A class for writing RSS 1.0.
*
* @see http://purl.org/rss/1.0/spec,
* http://www.usemod.com/cgi-bin/mb.pl?ModWiki
*/
class RssWriter extends XmlElement
{
function RssWriter () {
$this->XmlElement('rdf:RDF',
array('xmlns' => "http://purl.org/rss/1.0/",
'xmlns:rdf' => 'http://www.w3.org/1999/02/22-rdf-syntax-ns#'));
$this->_modules = array(
//Standards
'content' => "http://purl.org/rss/1.0/modules/content/",
'dc' => "http://purl.org/dc/elements/1.1/",
'sy' => "http://purl.org/rss/1.0/modules/syndication/",
//Proposed
'wiki' => "http://purl.org/rss/1.0/modules/wiki/",
'ag' => "http://purl.org/rss/1.0/modules/aggregation/",
'annotate' => "http://purl.org/rss/1.0/modules/annotate/",
'audio' => "http://media.tangent.org/rss/1.0/",
'cp' => "http://my.theinfo.org/changed/1.0/rss/",
'rss091' => "http://purl.org/rss/1.0/modules/rss091/",
'slash' => "http://purl.org/rss/1.0/modules/slash/",
'taxo' => "http://purl.org/rss/1.0/modules/taxonomy/",
'thr' => "http://purl.org/rss/1.0/modules/threading/"
);
$this->_uris_seen = array();
$this->_items = array();
}
function registerModule($alias, $uri) {
assert(!isset($this->_modules[$alias]));
$this->_modules[$alias] = $uri;
}
// Args should include:
// 'title', 'link', 'description'
// and can include:
// 'URI'
function channel($properties, $uri = false) {
$this->_channel = $this->__node('channel', $properties, $uri);
}
// Args should include:
// 'title', 'link'
// and can include:
// 'description', 'URI'
function addItem($properties, $uri = false) {
$this->_items[] = $this->__node('item', $properties, $uri);
}
// Args should include:
// 'url', 'title', 'link'
// and can include:
// 'URI'
function image($properties, $uri = false) {
$this->_image = $this->__node('image', $properties, $uri);
}
// Args should include:
// 'title', 'description', 'name', and 'link'
// and can include:
// 'URI'
function textinput($properties, $uri = false) {
$this->_textinput = $this->__node('textinput', $properties, $uri);
}
/**
* Finish construction of RSS.
*/
function finish() {
if (isset($this->_finished))
return;
$channel = &$this->_channel;
$items = &$this->_items;
$seq = new XmlElement('rdf:Seq');
if ($items) {
foreach ($items as $item)
$seq->pushContent($this->__ref('rdf:li', $item));
}
$channel->pushContent(new XmlElement('items', false, $seq));
if (isset($this->_image)) {
$channel->pushContent($this->__ref('image', $this->_image));
$items[] = $this->_image;
}
if (isset($this->_textinput)) {
$channel->pushContent($this->__ref('textinput', $this->_textinput));
$items[] = $this->_textinput;
}
$this->pushContent($channel);
if ($items)
$this->pushContent($items);
$this->__spew();
$this->_finished = true;
}
/**
* Write output to HTTP client.
*/
function __spew() {
header("Content-Type: application/xml; charset=" . RSS_ENCODING);
printf("<?xml version=\"1.0\" encoding=\"%s\"?>\n", RSS_ENCODING);
printf("<!-- generator=\"PhpWiki-%s\" -->\n", PHPWIKI_VERSION);
$this->printXML();
}
/**
* Create a new RDF <em>typedNode</em>.
*/
function __node($type, $properties, $uri = false) {
if (! $uri)
$uri = $properties['link'];
$attr['rdf:about'] = $this->__uniquify_uri($uri);
return new XmlElement($type, $attr,
$this->__elementize($properties));
}
/**
* Check object URI for uniqueness, create a unique URI if needed.
*/
function __uniquify_uri ($uri) {
if (!$uri || isset($this->_uris_seen[$uri])) {
$n = count($this->_uris_seen);
$uri = $this->_channel->getAttr('rdf:about') . "#uri$n";
assert(!isset($this->_uris_seen[$uri]));
}
$this->_uris_seen[$uri] = true;
return $uri;
}
/**
* Convert hash of RDF properties to <em>propertyElt</em>s.
*/
function __elementize ($elements) {
$out = array();
foreach ($elements as $prop => $val) {
$this->__check_predicate($prop);
$out[] = new XmlElement($prop, false, $val);
}
return $out;
}
/**
* Check property predicates for XMLNS sanity.
*/
function __check_predicate ($name) {
if (preg_match('/^([^:]+):[^:]/', $name, $m)) {
$ns = $m[1];
if (! $this->getAttr("xmlns:$ns")) {
if (!isset($this->_modules[$ns]))
die("$name: unknown namespace ($ns)");
$this->setAttr("xmlns:$ns", $this->_modules[$ns]);
}
}
}
/**
* Create a <em>propertyElt</em> which references another node in the RSS.
*/
function __ref($predicate, $reference) {
$attr['rdf:resource'] = $reference->getAttr('rdf:about');
return new XmlElement($predicate, $attr);
}
};
// (c-file-style: "gnu")
// Local Variables:
// mode: php
// tab-width: 8
// c-basic-offset: 4
// c-hanging-comment-ender-p: nil
// indent-tabs-mode: nil
// End:
?>
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