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<?php
namespace Drupal\views\Plugin\views\style;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;
/**
* Default style plugin to render an RSS feed.
*
* @ingroup views_style_plugins
*
* @ViewsStyle(
* id = "rss",
* title = @Translation("RSS Feed"),
* help = @Translation("Generates an RSS feed from a view."),
* theme = "views_view_rss",
* display_types = {"feed"}
* )
*/
class Rss extends StylePluginBase {
/**
* Does the style plugin for itself support to add fields to it's output.
*
* @var bool
*/
protected $usesRowPlugin = TRUE;
public function attachTo(array &$build, $display_id, Url $feed_url, $title) {
$url_options = [];
$input = $this->view->getExposedInput();
if ($input) {
$url_options['query'] = $input;
}
$url_options['absolute'] = TRUE;
$url = $feed_url->setOptions($url_options)->toString();
// Add the RSS icon to the view.
$this->view->feedIcons[] = [
'#theme' => 'feed_icon',
'#url' => $url,
'#title' => $title,
];
// Attach a link to the RSS feed, which is an alternate representation.
$build['#attached']['html_head_link'][][] = [
'rel' => 'alternate',
'type' => 'application/rss+xml',
'title' => $title,
'href' => $url,
];
}
protected function defineOptions() {
$options = parent::defineOptions();
$options['description'] = ['default' => ''];
return $options;
}
public function buildOptionsForm(&$form, FormStateInterface $form_state) {
parent::buildOptionsForm($form, $form_state);
$form['description'] = [
'#type' => 'textfield',
'#title' => $this->t('RSS description'),
'#default_value' => $this->options['description'],
'#description' => $this->t('This will appear in the RSS feed itself.'),
'#maxlength' => 1024,
];
}
/**
* Return an array of additional XHTML elements to add to the channel.
*
* @return
* A render array.
*/
protected function getChannelElements() {
return [];
}
/**
* Get RSS feed description.
*
* @return string
* The string containing the description with the tokens replaced.
*/
public function getDescription() {
$description = $this->options['description'];
// Allow substitutions from the first row.
$description = $this->tokenizeValue($description, 0);
return $description;
}
public function render() {
if (empty($this->view->rowPlugin)) {
debug('Drupal\views\Plugin\views\style\Rss: Missing row plugin');
return [];
}
$rows = [];
// This will be filled in by the row plugin and is used later on in the
// theming output.
$this->namespaces = ['xmlns:dc' => 'http://purl.org/dc/elements/1.1/'];
// Fetch any additional elements for the channel and merge in their
// namespaces.
$this->channel_elements = $this->getChannelElements();
foreach ($this->channel_elements as $element) {
if (isset($element['namespace'])) {
$this->namespaces = array_merge($this->namespaces, $element['namespace']);
}
}
foreach ($this->view->result as $row_index => $row) {
$this->view->row_index = $row_index;
$rows[] = $this->view->rowPlugin->render($row);
}
$build = [
'#theme' => $this->themeFunctions(),
'#view' => $this->view,
'#options' => $this->options,
'#rows' => $rows,
];
unset($this->view->row_index);
return $build;
}
}