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<?php
namespace PicoFeed;
use SimpleXMLElement;
/**
* OPML export class
*
* @author Frederic Guillot
* @package picofeed
*/
class Export
{
/**
* List of feeds to exports
*
* @access private
* @var array
*/
private $content = array();
/**
* List of required properties for each feed
*
* @access private
* @var array
*/
private $required_fields = array(
'title',
'site_url',
'feed_url',
);
/**
* Constructor
*
* @access public
* @param array $content List of feeds
*/
public function __construct(array $content)
{
$this->content = $content;
}
/**
* Get the OPML document
*
* @access public
* @return string
*/
public function execute()
{
$xml = new SimpleXMLElement('<?xml version="1.0" encoding="utf-8"?><opml/>');
$head = $xml->addChild('head');
$head->addChild('title', 'OPML Export');
$body = $xml->addChild('body');
foreach ($this->content as $category => $values) {
if (is_string($category)) {
$this->createCategory($body, $category, $values);
}
else {
$this->createEntry($body, $values);
}
}
return $xml->asXML();
}
/**
* Create a feed entry
*
* @access public
* @param SimpleXMLElement $parent Parent Element
* @param array $feed Feed properties
*/
public function createEntry(SimpleXMLElement $parent, array $feed)
{
$valid = true;
foreach ($this->required_fields as $field) {
if (! isset($feed[$field])) {
$valid = false;
break;
}
}
if ($valid) {
$outline = $parent->addChild('outline');
$outline->addAttribute('xmlUrl', $feed['feed_url']);
$outline->addAttribute('htmlUrl', $feed['site_url']);
$outline->addAttribute('title', $feed['title']);
$outline->addAttribute('text', $feed['title']);
$outline->addAttribute('description', isset($feed['description']) ? $feed['description'] : $feed['title']);
$outline->addAttribute('type', 'rss');
$outline->addAttribute('version', 'RSS');
}
}
/**
* Create entries for a feed list
*
* @access public
* @param SimpleXMLElement $parent Parent Element
* @param array $feeds Feed list
*/
public function createEntries(SimpleXMLElement $parent, array $feeds)
{
foreach ($feeds as $feed) {
$this->createEntry($parent, $feed);
}
}
/**
* Create a category entry
*
* @access public
* @param SimpleXMLElement $parent Parent Element
* @param string $category Category
* @param array $feed Feed properties
*/
public function createCategory(SimpleXMLElement $parent, $category, array $feeds)
{
$outline = $parent->addChild('outline');
$outline->addAttribute('text', $category);
$this->createEntries($outline, $feeds);
}
}
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