function rdf_rdfa_attributes

Builds an array of RDFa attributes for a given mapping.

This array will typically be passed through Drupal\Core\Template\Attribute to create the attributes variables that are available to template files. These include $attributes, $title_attributes, $content_attributes and the field-specific $item_attributes variables.

Parameters

array $mapping: An array containing a mandatory 'properties' key and optional 'datatype', 'datatype_callback' and 'type' keys. For example:

array(
    'properties' => array(
        'schema:interactionCount',
    ),
    'datatype' => 'xsd:integer',
    'datatype_callback' => array(
        'callable' => 'Drupal\\rdf\\SchemaOrgDataConverter::interactionCount',
        'arguments' => array(
            'interaction_type' => 'UserComments',
        ),
    ),
);

mixed $data: (optional) A value that needs to be converted by the provided callback function.

Return value

array RDFa attributes suitable for Drupal\Core\Template\Attribute.

Related topics

File

core/modules/rdf/rdf.module, line 173

Code

function rdf_rdfa_attributes($mapping, $data = NULL) {
    $attributes = [];
    // The type of mapping defaults to 'property'.
    $type = $mapping['mapping_type'] ?? 'property';
    switch ($type) {
        // The mapping expresses the relationship between two resources.
        case 'rel':
        case 'rev':
            $attributes[$type] = $mapping['properties'];
            break;
        // The mapping expresses the relationship between a resource and some
        // literal text.
        case 'property':
            if (!empty($mapping['properties'])) {
                $attributes['property'] = $mapping['properties'];
                // Convert $data to a specific format as per the callback function.
                if (isset($data) && !empty($mapping['datatype_callback'])) {
                    $callback = $mapping['datatype_callback']['callable'];
                    $arguments = $mapping['datatype_callback']['arguments'] ?? NULL;
                    $attributes['content'] = call_user_func($callback, $data, $arguments);
                }
                if (isset($mapping['datatype'])) {
                    $attributes['datatype'] = $mapping['datatype'];
                }
                break;
            }
    }
    return $attributes;
}