protected function DerivativeDiscoveryDecorator::mergeDerivativeDefinition

Merges a base and derivative definition, taking into account empty values.

Parameters

array $base_plugin_definition: The base plugin definition.

array $derivative_definition: The derivative plugin definition.

Return value

array The merged definition.

File

core/lib/Drupal/Component/Plugin/Discovery/DerivativeDiscoveryDecorator.php, line 238

Class

DerivativeDiscoveryDecorator

Base class providing the tools for a plugin discovery to be derivative aware.

Namespace

Code

protected function mergeDerivativeDefinition($base_plugin_definition, $derivative_definition) {

  // Use this definition as defaults if a plugin already defined itself as
  // this derivative, but filter out empty values first.
  $filtered_base = array_filter($base_plugin_definition);
  $derivative_definition = $filtered_base + ($derivative_definition ?: []);

  // Add back any empty keys that the derivative didn't have.
  return $derivative_definition + $base_plugin_definition;
}