/**
* Serialize an entity post.
*
* @param array $entity The entity post or the entity post id.
*
* @return array mixed The entity data array.
*/
function wl_serialize_entity($entity)
{
$entity = is_numeric($entity) ? get_post($entity) : $entity;
$type = wl_entity_type_taxonomy_get_type($entity->ID);
$images = wl_get_image_urls($entity->ID);
return array('id' => wl_get_entity_uri($entity->ID), 'label' => $entity->post_title, 'description' => wp_strip_all_tags($entity->post_content), 'sameAs' => wl_schema_get_value($entity->ID, 'sameAs'), 'mainType' => str_replace('wl-', '', $type['css_class']), 'types' => wl_get_entity_rdf_types($entity->ID), 'images' => $images);
}
/**
* Optimize and convert retrieved content to JSON.
*
* @used-by wl_shortcode_chord_ajax
*
* @param $data
* @return mixed|string|void
*/
function wl_shortcode_chord_get_graph($data)
{
// Refactor the entities array in order to provide entities relevant data (uri, url, label, type, css_class).
array_walk($data['entities'], function (&$item) {
$post = get_post($item);
// Skip non-existing posts.
if (is_null($post)) {
wl_write_log("wl_shortcode_chord_get_graph : post not found [ post id :: {$item} ]");
return $item;
}
// Get the entity taxonomy bound to this post (if there's no taxonomy, no stylesheet will be set).
$term = wl_entity_type_taxonomy_get_type($item);
wl_write_log("wl_shortcode_chord_get_graph [ post id :: {$post->ID} ][ term :: " . var_export($term, true) . " ]");
$entity = array('uri' => wl_get_entity_uri($item), 'url' => get_permalink($item), 'label' => $post->post_title, 'type' => $post->post_type, 'thumbnails' => wl_get_image_urls($post->ID), 'css_class' => isset($term['css_class']) ? $term['css_class'] : '');
$item = $entity;
});
// Refactor the relations.
array_walk($data['relations'], function (&$item) {
$relation = array('s' => wl_get_entity_uri($item[0]), 'o' => wl_get_entity_uri($item[1]));
$item = $relation;
});
// Return the JSON representation.
return $data;
}
/**
* Get a SPARQL fragment with schema:image predicates.
*
* @param string $uri The URI subject of the statements.
* @param int $post_id The post ID.
*
* @return string The SPARQL fragment.
*/
function wl_get_sparql_images($uri, $post_id)
{
$sparql = '';
// Get the escaped URI.
$uri_e = esc_html($uri);
// Add SPARQL stmts to write the schema:image.
$image_urls = wl_get_image_urls($post_id);
foreach ($image_urls as $image_url) {
$image_url_esc = wl_sparql_escape_uri($image_url);
$sparql .= " <{$uri_e}> schema:image <{$image_url_esc}> . \n";
}
return $sparql;
}
